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[PATCH v3 4/7] colo: Introduce resource agent
|
From: |
Lukas Straub |
|
Subject: |
[PATCH v3 4/7] colo: Introduce resource agent |
|
Date: |
Tue, 4 Aug 2020 12:46:55 +0200 |
Introduce a resource agent which can be used to manage qemu COLO
in a pacemaker cluster.
Signed-off-by: Lukas Straub <lukasstraub2@web.de>
---
scripts/colo-resource-agent/colo | 1501 ++++++++++++++++++++++++++++++
1 file changed, 1501 insertions(+)
create mode 100755 scripts/colo-resource-agent/colo
diff --git a/scripts/colo-resource-agent/colo b/scripts/colo-resource-agent/colo
new file mode 100755
index 0000000000..fa70c0ae51
--- /dev/null
+++ b/scripts/colo-resource-agent/colo
@@ -0,0 +1,1501 @@
+#!/usr/bin/env python3
+
+# Resource agent for qemu COLO for use with Pacemaker CRM
+#
+# Copyright (c) Lukas Straub <lukasstraub2@web.de>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later. See the COPYING file in the top-level directory.
+
+import subprocess
+import sys
+import os
+import os.path
+import signal
+import socket
+import select
+import json
+import re
+import time
+import logging
+import logging.handlers
+
+# Constants
+OCF_SUCCESS = 0
+OCF_ERR_GENERIC = 1
+OCF_ERR_ARGS = 2
+OCF_ERR_UNIMPLEMENTED = 3
+OCF_ERR_PERM = 4
+OCF_ERR_INSTALLED = 5
+OCF_ERR_CONFIGURED = 6
+OCF_NOT_RUNNING = 7
+OCF_RUNNING_MASTER = 8
+OCF_FAILED_MASTER = 9
+
+# Get environment variables
+OCF_RESKEY_CRM_meta_notify_type \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_type")
+OCF_RESKEY_CRM_meta_notify_operation \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_operation")
+OCF_RESKEY_CRM_meta_notify_key_operation \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_key_operation")
+OCF_RESKEY_CRM_meta_notify_start_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_start_uname", "")
+OCF_RESKEY_CRM_meta_notify_stop_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_stop_uname", "")
+OCF_RESKEY_CRM_meta_notify_active_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_active_uname", "")
+OCF_RESKEY_CRM_meta_notify_promote_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_promote_uname", "")
+OCF_RESKEY_CRM_meta_notify_demote_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_demote_uname", "")
+OCF_RESKEY_CRM_meta_notify_master_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_master_uname", "")
+OCF_RESKEY_CRM_meta_notify_slave_uname \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify_slave_uname", "")
+
+HA_RSCTMP = os.getenv("HA_RSCTMP", "/run/resource-agents")
+HA_LOGFACILITY = os.getenv("HA_LOGFACILITY")
+HA_LOGFILE = os.getenv("HA_LOGFILE")
+HA_DEBUG = os.getenv("HA_debug", "0")
+HA_DEBUGLOG = os.getenv("HA_DEBUGLOG")
+OCF_RESOURCE_INSTANCE = os.getenv("OCF_RESOURCE_INSTANCE", "default-instance")
+OCF_RESKEY_CRM_meta_timeout \
+ = os.getenv("OCF_RESKEY_CRM_meta_timeout", "60000")
+OCF_RESKEY_CRM_meta_interval \
+ = int(os.getenv("OCF_RESKEY_CRM_meta_interval", "1"))
+OCF_RESKEY_CRM_meta_clone_max \
+ = int(os.getenv("OCF_RESKEY_CRM_meta_clone_max", "1"))
+OCF_RESKEY_CRM_meta_clone_node_max \
+ = int(os.getenv("OCF_RESKEY_CRM_meta_clone_node_max", "1"))
+OCF_RESKEY_CRM_meta_master_max \
+ = int(os.getenv("OCF_RESKEY_CRM_meta_master_max", "1"))
+OCF_RESKEY_CRM_meta_master_node_max \
+ = int(os.getenv("OCF_RESKEY_CRM_meta_master_node_max", "1"))
+OCF_RESKEY_CRM_meta_notify \
+ = os.getenv("OCF_RESKEY_CRM_meta_notify")
+OCF_RESKEY_CRM_meta_globally_unique \
+ = os.getenv("OCF_RESKEY_CRM_meta_globally_unique")
+
+HOSTNAME = os.getenv("OCF_RESKEY_CRM_meta_on_node", socket.gethostname())
+
+OCF_ACTION = os.getenv("__OCF_ACTION")
+if not OCF_ACTION and len(sys.argv) == 2:
+ OCF_ACTION = sys.argv[1]
+
+# Resource parameters
+OCF_RESKEY_qemu_binary_default = "qemu-system-x86_64"
+OCF_RESKEY_qemu_img_binary_default = "qemu-img"
+OCF_RESKEY_log_dir_default = HA_RSCTMP
+OCF_RESKEY_options_default = ""
+OCF_RESKEY_active_hidden_dir_default = ""
+OCF_RESKEY_listen_address_default = "0.0.0.0"
+OCF_RESKEY_base_port_default = "9000"
+OCF_RESKEY_checkpoint_interval_default = "20000"
+OCF_RESKEY_compare_timeout_default = "3000"
+OCF_RESKEY_expired_scan_cycle_default = "3000"
+OCF_RESKEY_max_queue_size_default = "1024"
+OCF_RESKEY_use_filter_rewriter_default = "true"
+OCF_RESKEY_vnet_hdr_default = "false"
+OCF_RESKEY_max_disk_errors_default = "1"
+OCF_RESKEY_monitor_timeout_default = "20000"
+OCF_RESKEY_yank_timeout_default = "10000"
+OCF_RESKEY_fail_fast_timeout_default = "5000"
+OCF_RESKEY_debug_default = "0"
+
+OCF_RESKEY_qemu_binary \
+ = os.getenv("OCF_RESKEY_qemu_binary", OCF_RESKEY_qemu_binary_default)
+OCF_RESKEY_qemu_img_binary \
+ = os.getenv("OCF_RESKEY_qemu_img_binary",
OCF_RESKEY_qemu_img_binary_default)
+OCF_RESKEY_log_dir \
+ = os.getenv("OCF_RESKEY_log_dir", OCF_RESKEY_log_dir_default)
+OCF_RESKEY_options \
+ = os.getenv("OCF_RESKEY_options", OCF_RESKEY_options_default)
+OCF_RESKEY_active_hidden_dir \
+ = os.getenv("OCF_RESKEY_active_hidden_dir",
OCF_RESKEY_active_hidden_dir_default)
+OCF_RESKEY_listen_address \
+ = os.getenv("OCF_RESKEY_listen_address", OCF_RESKEY_listen_address_default)
+OCF_RESKEY_base_port \
+ = os.getenv("OCF_RESKEY_base_port", OCF_RESKEY_base_port_default)
+OCF_RESKEY_checkpoint_interval \
+ = os.getenv("OCF_RESKEY_checkpoint_interval",
OCF_RESKEY_checkpoint_interval_default)
+OCF_RESKEY_compare_timeout \
+ = os.getenv("OCF_RESKEY_compare_timeout",
OCF_RESKEY_compare_timeout_default)
+OCF_RESKEY_expired_scan_cycle \
+ = os.getenv("OCF_RESKEY_expired_scan_cycle",
OCF_RESKEY_expired_scan_cycle_default)
+OCF_RESKEY_max_queue_size \
+ = os.getenv("OCF_RESKEY_max_queue_size", OCF_RESKEY_max_queue_size_default)
+OCF_RESKEY_use_filter_rewriter \
+ = os.getenv("OCF_RESKEY_use_filter_rewriter",
OCF_RESKEY_use_filter_rewriter_default)
+OCF_RESKEY_vnet_hdr \
+ = os.getenv("OCF_RESKEY_vnet_hdr", OCF_RESKEY_vnet_hdr_default)
+OCF_RESKEY_max_disk_errors \
+ = os.getenv("OCF_RESKEY_max_disk_errors",
OCF_RESKEY_max_disk_errors_default)
+OCF_RESKEY_monitor_timeout \
+ = os.getenv("OCF_RESKEY_monitor_timeout",
OCF_RESKEY_monitor_timeout_default)
+OCF_RESKEY_yank_timeout \
+ = os.getenv("OCF_RESKEY_yank_timeout", OCF_RESKEY_yank_timeout_default)
+OCF_RESKEY_fail_fast_timeout \
+ = os.getenv("OCF_RESKEY_fail_fast_timeout",
OCF_RESKEY_fail_fast_timeout_default)
+OCF_RESKEY_debug \
+ = os.getenv("OCF_RESKEY_debug", OCF_RESKEY_debug_default)
+
+ACTIVE_IMAGE = os.path.join(OCF_RESKEY_active_hidden_dir, \
+ OCF_RESOURCE_INSTANCE + "-active.qcow2")
+HIDDEN_IMAGE = os.path.join(OCF_RESKEY_active_hidden_dir, \
+ OCF_RESOURCE_INSTANCE + "-hidden.qcow2")
+
+QMP_SOCK = os.path.join(HA_RSCTMP, OCF_RESOURCE_INSTANCE + "-qmp.sock")
+HELPER_SOCK = os.path.join(HA_RSCTMP, OCF_RESOURCE_INSTANCE + "-helper.sock")
+COMP_SOCK = os.path.join(HA_RSCTMP, OCF_RESOURCE_INSTANCE + "-compare.sock")
+COMP_OUT_SOCK = os.path.join(HA_RSCTMP, OCF_RESOURCE_INSTANCE \
+ + "-comp_out.sock")
+
+PID_FILE = os.path.join(HA_RSCTMP, OCF_RESOURCE_INSTANCE + "-qemu.pid")
+
+QMP_LOG = os.path.join(OCF_RESKEY_log_dir, OCF_RESOURCE_INSTANCE + "-qmp.log")
+QEMU_LOG = os.path.join(OCF_RESKEY_log_dir, OCF_RESOURCE_INSTANCE +
"-qemu.log")
+HELPER_LOG = os.path.join(OCF_RESKEY_log_dir, OCF_RESOURCE_INSTANCE \
+ +
"-helper.log")
+
+START_TIME = time.time()
+did_yank = False
+
+# Exception only raised by ourself
+class Error(Exception):
+ pass
+
+def setup_constants():
+ # This function is called after the parameters where validated
+ global OCF_RESKEY_CRM_meta_timeout
+ if OCF_ACTION == "monitor":
+ OCF_RESKEY_CRM_meta_timeout = OCF_RESKEY_monitor_timeout
+
+ global MIGRATE_PORT, MIRROR_PORT, COMPARE_IN_PORT, NBD_PORT
+ MIGRATE_PORT = int(OCF_RESKEY_base_port)
+ MIRROR_PORT = int(OCF_RESKEY_base_port) + 1
+ COMPARE_IN_PORT = int(OCF_RESKEY_base_port) + 2
+ NBD_PORT = int(OCF_RESKEY_base_port) + 3
+
+ global QEMU_PRIMARY_CMDLINE
+ QEMU_PRIMARY_CMDLINE = \
+ ("'%(OCF_RESKEY_qemu_binary)s' %(OCF_RESKEY_options)s"
+ " -drive if=none,node-name=colo-disk0,driver=quorum,read-pattern=fifo,"
+ "vote-threshold=1,children.0=parent0"
+ " -qmp unix:'%(QMP_SOCK)s',server,nowait -no-shutdown"
+ " -daemonize -D '%(QEMU_LOG)s' -pidfile '%(PID_FILE)s'") % globals()
+
+ global QEMU_SECONDARY_CMDLINE
+ QEMU_SECONDARY_CMDLINE = \
+ ("'%(OCF_RESKEY_qemu_binary)s' %(OCF_RESKEY_options)s"
+ " -chardev socket,id=red0,host='%(OCF_RESKEY_listen_address)s',"
+ "port=%(MIRROR_PORT)s,server,nowait,nodelay"
+ " -chardev socket,id=red1,host='%(OCF_RESKEY_listen_address)s',"
+ "port=%(COMPARE_IN_PORT)s,server,nowait,nodelay"
+ " -object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0"
+ " -object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1") \
+ % globals()
+
+ if is_true(OCF_RESKEY_use_filter_rewriter):
+ QEMU_SECONDARY_CMDLINE += \
+ " -object filter-rewriter,id=rew0,netdev=hn0,queue=all"
+
+ QEMU_SECONDARY_CMDLINE += \
+ (" -drive if=none,node-name=childs0,top-id=colo-disk0,"
+ "driver=replication,mode=secondary,file.driver=qcow2,"
+ "file.file.filename='%(ACTIVE_IMAGE)s',file.backing.driver=qcow2,"
+ "file.backing.file.filename='%(HIDDEN_IMAGE)s',"
+ "file.backing.backing=parent0"
+ " -drive if=none,node-name=colo-disk0,driver=quorum,read-pattern=fifo,"
+ "vote-threshold=1,children.0=childs0"
+ " -incoming tcp:'%(OCF_RESKEY_listen_address)s':%(MIGRATE_PORT)s"
+ " -qmp unix:'%(QMP_SOCK)s',server,nowait -no-shutdown"
+ " -daemonize -D '%(QEMU_LOG)s' -pidfile '%(PID_FILE)s'") % globals()
+
+ global QEMU_DUMMY_CMDLINE
+ QEMU_DUMMY_CMDLINE = \
+ ("'%(OCF_RESKEY_qemu_binary)s' %(OCF_RESKEY_options)s"
+ " -drive if=none,node-name=colo-disk0,driver=null-co -S"
+ " -qmp unix:'%(QMP_SOCK)s',server,nowait"
+ " -daemonize -D '%(QEMU_LOG)s' -pidfile '%(PID_FILE)s'") % globals()
+
+def qemu_colo_meta_data():
+ print("""\
+<?xml version="1.0"?>
+<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
+<resource-agent name="colo">
+
+ <version>1.0</version>
+ <longdesc lang="en">
+Resource agent for qemu COLO. (https://wiki.qemu.org/Features/COLO)
+
+After defining the master/slave instance, the master score has to be
+manually set to show which node has up-to-date data. So you copy your
+image to one host (and create empty images the other host(s)) and then
+run "crm_master -r name_of_your_primitive -v 10" on that host.
+Also, you have to set 'notify=true' in the metadata attributes when
+defining the master/slave instance.
+
+Note:
+-If the instance is stopped cluster-wide, the resource agent will do a
+clean shutdown. Set the demote timeout to the time it takes for your
+guest to shutdown.
+-Colo replication is started from the monitor action. Set the monitor
+timeout to at least the time it takes for replication to start. You can
+set the monitor_timeout parameter for a soft timeout, which the resource
+agent tries to satisfy.
+-The resource agent may notify pacemaker about peer failure,
+these failures will show up with exitreason="Simulated failure".
+ </longdesc>
+ <shortdesc lang="en">Qemu COLO</shortdesc>
+
+ <parameters>
+
+ <parameter name="qemu_binary" unique="0" required="0">
+ <longdesc lang="en">qemu binary to use</longdesc>
+ <shortdesc lang="en">qemu binary</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_qemu_binary_default + """\"/>
+ </parameter>
+
+ <parameter name="qemu_img_binary" unique="0" required="0">
+ <longdesc lang="en">qemu-img binary to use</longdesc>
+ <shortdesc lang="en">qemu-img binary</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_qemu_img_binary_default + """\"/>
+ </parameter>
+
+ <parameter name="log_dir" unique="0" required="0">
+ <longdesc lang="en">Directory to place logs in</longdesc>
+ <shortdesc lang="en">Log directory</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_log_dir_default + """\"/>
+ </parameter>
+
+ <parameter name="options" unique="0" required="1">
+ <longdesc lang="en">
+Options to pass to qemu. These will be passed alongside COLO specific
+options, so you need to follow these conventions: The netdev should have
+id=hn0 and the disk controller drive=colo-disk0. The image node should
+have node-name=parent0, but should not be connected to the guest.
+Example:
+-vnc :0 -enable-kvm -cpu qemu64,+kvmclock -m 512 -netdev bridge,id=hn0
+-device e1000,netdev=hn0 -device virtio-blk,drive=colo-disk0
+-drive if=none,node-name=parent0,format=qcow2,file=/mnt/vms/vm01.qcow2
+ </longdesc>
+ <shortdesc lang="en">Options to pass to qemu.</shortdesc>
+ </parameter>
+
+ <parameter name="active_hidden_dir" unique="0" required="1">
+ <longdesc lang="en">
+Directory where the active and hidden images will be stored. It is
+recommended to put this on a ramdisk.
+ </longdesc>
+ <shortdesc lang="en">Path to active and hidden images</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_active_hidden_dir_default + """\"/>
+ </parameter>
+
+ <parameter name="listen_address" unique="0" required="0">
+ <longdesc lang="en">Address to listen on.</longdesc>
+ <shortdesc lang="en">Listen address</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_listen_address_default + """\"/>
+ </parameter>
+
+ <parameter name="base_port" unique="1" required="0">
+ <longdesc lang="en">
+4 tcp ports that are unique for each instance. (base_port to base_port + 3)
+ </longdesc>
+ <shortdesc lang="en">Ports to use</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_base_port_default + """\"/>
+ </parameter>
+
+ <parameter name="checkpoint_interval" unique="0" required="0">
+ <longdesc lang="en">
+Interval for regular checkpoints in milliseconds.
+ </longdesc>
+ <shortdesc lang="en">Interval for regular checkpoints</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_checkpoint_interval_default + """\"/>
+ </parameter>
+
+ <parameter name="compare_timeout" unique="0" required="0">
+ <longdesc lang="en">
+Maximum time to hold a primary packet if secondary hasn't sent it yet,
+in milliseconds.
+You should also adjust "expired_scan_cycle" accordingly.
+ </longdesc>
+ <shortdesc lang="en">Compare timeout</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_compare_timeout_default + """\"/>
+ </parameter>
+
+ <parameter name="expired_scan_cycle" unique="0" required="0">
+ <longdesc lang="en">
+Interval for checking for expired primary packets in milliseconds.
+ </longdesc>
+ <shortdesc lang="en">Expired packet check interval</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_expired_scan_cycle_default + """\"/>
+ </parameter>
+
+ <parameter name="max_queue_size" unique="0" required="0">
+ <longdesc lang="en">
+Maximum queue size for network packets.
+ </longdesc>
+ <shortdesc lang="en">Maximum queue size</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_max_queue_size_default + """\"/>
+ </parameter>
+
+ <parameter name="use_filter_rewriter" unique="0" required="0">
+ <longdesc lang="en">
+Use filter-rewriter to increase similarity between the VMs.
+ </longdesc>
+ <shortdesc lang="en">Use filter-rewriter</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_use_filter_rewriter_default + """\"/>
+ </parameter>
+
+ <parameter name="vnet_hdr" unique="0" required="0">
+ <longdesc lang="en">
+Set this to true if your system supports vnet_hdr and you enabled
+it on the tap netdev.
+ </longdesc>
+ <shortdesc lang="en">vnet_hdr support</shortdesc>
+ <content type="string" default=\"""" \
+ + OCF_RESKEY_vnet_hdr_default + """\"/>
+ </parameter>
+
+ <parameter name="max_disk_errors" unique="0" required="0">
+ <longdesc lang="en">
+Maximum disk read errors per monitor interval before marking the resource
+as failed. A write error is always fatal except if the value is 0.
+A value of 0 will disable disk error handling.
+Primary disk errors are only handled if there is a healthy secondary.
+ </longdesc>
+ <shortdesc lang="en">Maximum disk errors</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_max_disk_errors_default + """\"/>
+ </parameter>
+
+ <parameter name="monitor_timeout" unique="0" required="0">
+ <longdesc lang="en">
+Soft timeout for monitor, in milliseconds.
+Must be lower than the monitor action timeout.
+ </longdesc>
+ <shortdesc lang="en">Monitor timeout</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_monitor_timeout_default + """\"/>
+ </parameter>
+
+ <parameter name="yank_timeout" unique="0" required="0">
+ <longdesc lang="en">
+Timeout for QMP commands after which to execute the "yank" command,
+in milliseconds.
+Must be lower than any of the action timeouts.
+ </longdesc>
+ <shortdesc lang="en">Yank timeout</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_yank_timeout_default + """\"/>
+ </parameter>
+
+ <parameter name="fail_fast_timeout" unique="0" required="0">
+ <longdesc lang="en">
+Timeout for QMP commands used in the stop and demote actions to speed
+up recovery from a hanging qemu, in milliseconds.
+Must be lower than any of the action timeouts.
+ </longdesc>
+ <shortdesc lang="en">Timeout for fast paths</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_fail_fast_timeout_default + """\"/>
+ </parameter>
+
+ <parameter name="debug" unique="0" required="0">
+ <longdesc lang="en">
+Control debugging:
+0: disable debugging
+1: log debug messages and qmp commands
+2: + dump core of hanging qemu
+ </longdesc>
+ <shortdesc lang="en">Control debugging</shortdesc>
+ <content type="integer" default=\"""" \
+ + OCF_RESKEY_debug_default + """\"/>
+ </parameter>
+
+ </parameters>
+
+ <actions>
+ <action name="start" timeout="30s" />
+ <action name="stop" timeout="10s" />
+ <action name="monitor" timeout="30s" \
+ interval="1000ms" depth="0" role="Slave" />
+ <action name="monitor" timeout="30s" \
+ interval="1001ms" depth="0" role="Master" />
+ <action name="notify" timeout="30s" />
+ <action name="promote" timeout="30s" />
+ <action name="demote" timeout="120s" />
+ <action name="meta-data" timeout="5s" />
+ <action name="validate-all" timeout="20s" />
+ </actions>
+
+</resource-agent>
+""")
+
+def logs_open():
+ global log
+ log = logging.getLogger(OCF_RESOURCE_INSTANCE)
+ if int(OCF_RESKEY_debug) >= 1 or HA_DEBUG != "0":
+ log.setLevel(logging.DEBUG)
+ else:
+ log.setLevel(logging.INFO)
+
+ formater = logging.Formatter("(%(name)s) %(levelname)s: %(message)s")
+
+ if sys.stdout.isatty():
+ handler = logging.StreamHandler(stream=sys.stderr)
+ handler.setFormatter(formater)
+ log.addHandler(handler)
+
+ if HA_LOGFACILITY:
+ handler = logging.handlers.SysLogHandler("/dev/log")
+ handler.setFormatter(formater)
+ log.addHandler(handler)
+
+ if HA_LOGFILE:
+ handler = logging.FileHandler(HA_LOGFILE)
+ handler.setFormatter(formater)
+ log.addHandler(handler)
+
+ if HA_DEBUGLOG and HA_DEBUGLOG != HA_LOGFILE:
+ handler = logging.FileHandler(HA_DEBUGLOG)
+ handler.setFormatter(formater)
+ log.addHandler(handler)
+
+ global qmp_log
+ qmp_log = logging.getLogger("qmp_log")
+ qmp_log.setLevel(logging.DEBUG)
+ formater = logging.Formatter("%(message)s")
+
+ if int(OCF_RESKEY_debug) >= 1:
+ handler = logging.handlers.WatchedFileHandler(QMP_LOG)
+ handler.setFormatter(formater)
+ qmp_log.addHandler(handler)
+ else:
+ handler = logging.NullHandler()
+ qmp_log.addHandler(handler)
+
+def rotate_logfile(logfile, numlogs):
+ numlogs -= 1
+ for n in range(numlogs, -1, -1):
+ _file = logfile
+ if n != 0:
+ _file = "%s.%s" % (_file, n)
+ if os.path.exists(_file):
+ if n == numlogs:
+ os.remove(_file)
+ else:
+ newname = "%s.%s" % (logfile, n + 1)
+ os.rename(_file, newname)
+
+def is_writable(_file):
+ return os.access(_file, os.W_OK)
+
+def is_executable_file(_file):
+ return os.path.isfile(_file) and os.access(_file, os.X_OK)
+
+def is_true(var):
+ return re.match("yes|true|1|YES|TRUE|True|ja|on|ON", str(var)) != None
+
+# Check if the binary exists and is executable
+def check_binary(binary):
+ if is_executable_file(binary):
+ return True
+ PATH = os.getenv("PATH", os.defpath)
+ for _dir in PATH.split(os.pathsep):
+ if is_executable_file(os.path.join(_dir, binary)):
+ return True
+ log.error("binary \"%s\" doesn't exist or not executable" % binary)
+ return False
+
+def run_command(commandline):
+ proc = subprocess.Popen(commandline, shell=True, stdout=subprocess.PIPE,
+ stderr=subprocess.STDOUT, universal_newlines=True)
+ stdout, stderr = proc.communicate()
+ if proc.returncode != 0:
+ log.error("command \"%s\" failed with code %s:\n%s" \
+ % (commandline, proc.returncode, stdout))
+ raise Error()
+
+# Functions for setting and getting the master score to tell Pacemaker which
+# host has the most recent data
+def set_master_score(score):
+ if score == 0:
+ run_command("crm_master -q -l forever -D")
+ else:
+ run_command("crm_master -q -l forever -v %s" % score)
+
+def set_remote_master_score(remote, score):
+ if score == 0:
+ run_command("crm_master -q -l forever -N '%s' -D" % remote)
+ else:
+ run_command("crm_master -q -l forever -N '%s' -v %s" % (remote, score))
+
+def get_master_score():
+ proc = subprocess.Popen("crm_master -q -G", shell=True,
+ stdout=subprocess.PIPE, stderr=subprocess.DEVNULL,
+ universal_newlines=True)
+ stdout, stderr = proc.communicate()
+ if proc.returncode != 0:
+ return 0
+ else:
+ return int(str.strip(stdout))
+
+def get_remote_master_score(remote):
+ proc = subprocess.Popen("crm_master -q -N '%s' -G" % remote, shell=True,
+ stdout=subprocess.PIPE, stderr=subprocess.DEVNULL,
+ universal_newlines=True)
+ stdout, stderr = proc.communicate()
+ if proc.returncode != 0:
+ return 0
+ else:
+ return int(str.strip(stdout))
+
+# Tell Pacemaker that the remote resource failed
+def report_remote_failure(remote):
+ run_command("crm_resource --resource '%s' --fail --node '%s'"
+ % (OCF_RESOURCE_INSTANCE, remote))
+
+def recv_line(fd):
+ line = ""
+ while True:
+ tmp = fd.recv(1).decode()
+ line += tmp
+ if tmp == "\n" or len(tmp) == 0:
+ break
+ return line
+
+# Filter out events
+def read_answer(fd):
+ while True:
+ line = recv_line(fd)
+ qmp_log.debug(str.strip(line))
+
+ if len(line) == 0:
+ log.error("qmp connection closed")
+ raise Error()
+
+ answer = json.loads(line)
+ # Ignore everything else
+ if "return" in answer or "error" in answer:
+ break
+ return answer
+
+# Execute one or more qmp commands
+def qmp_execute(fd, commands, ignore_error = False, do_yank = True):
+ for command in commands:
+ if not command:
+ continue
+
+ try:
+ to_send = json.dumps(command)
+ fd.sendall(str.encode(to_send + "\n"))
+ qmp_log.debug(to_send)
+
+ answer = read_answer(fd)
+ except Exception as e:
+ if isinstance(e, socket.timeout) and do_yank:
+ log.warning("Command timed out, trying to unfreeze qemu")
+ new_timeout = max(2, (int(OCF_RESKEY_CRM_meta_timeout)/1000) \
+ - (time.time() - START_TIME) - 2)
+ fd.settimeout(new_timeout)
+ try:
+ # answer is the answer of timed-out command
+ answer = yank(fd)
+ if not answer:
+ answer = read_answer(fd)
+ except socket.error as e:
+ log.error("while reading answer of timed out command: "
+ "%s\n%s" % (json.dumps(command), e))
+ raise Error()
+ elif isinstance(e, (socket.error, socket.timeout)):
+ log.error("while executing qmp command: %s\n%s" \
+ % (json.dumps(command), e))
+ raise Error()
+ else:
+ raise
+
+ if not ignore_error and ("error" in answer):
+ log.error("qmp command returned error:\n%s\n%s" \
+ % (json.dumps(command), json.dumps(answer)))
+ raise Error()
+
+ return answer
+
+# Open qemu qmp connection
+def qmp_open(fail_fast = False):
+ if fail_fast:
+ timeout = int(OCF_RESKEY_fail_fast_timeout)/1000
+ else:
+ timeout = int(OCF_RESKEY_yank_timeout)/1000
+
+ try:
+ fd = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ fd.settimeout(timeout)
+ fd.connect(HELPER_SOCK)
+ except socket.error as e:
+ log.error("while connecting to helper socket: %s" % e)
+ raise Error()
+
+ return fd
+
+def yank(fd):
+ global did_yank
+ did_yank = True
+ ret = None
+ while True:
+ answer = qmp_execute(fd, [{"exec-oob": "query-yank", "id": "yank0"}], \
+ do_yank = False, ignore_error = True)
+ if "id" not in answer:
+ # This is the answer of the timed-out command
+ ret = answer
+ answer = read_answer(fd)
+ if "error" in answer:
+ log.error("While executing 'query-yank':\n%s" % json.dumps(answer))
+ raise Error()
+ instances = []
+ for n in answer["return"]["instances"]:
+ if n == "blockdev:nbd0" or n == "chardev:mirror0" \
+ or n == "chardev:comp_sec_in0" or n == "migration" \
+ or n == "chardev:red0" or n == "chardev:red1":
+ instances.append(n)
+ answer = qmp_execute(fd, [{"exec-oob": "yank", "id": "yank0",
"arguments":{ "instances": instances }}], \
+ do_yank = False, ignore_error = True)
+ if "id" not in answer:
+ # This is the answer of the timed-out command
+ ret = answer
+ answer = read_answer(fd)
+ if "error" in answer:
+ if answer["error"]["class"] == "DeviceNotFound":
+ continue
+ else:
+ log.error("While executing 'yank':\n%s" % json.dumps(answer))
+ raise Error()
+ break
+
+ return ret
+
+def oob_helper_exec(client, cmd, events):
+ if cmd["exec-helper"] == "get-events":
+ event = cmd["arguments"]["event"]
+ if (event in events):
+ to_send = json.dumps({"return": events[event]})
+ client.sendall(str.encode(to_send + "\n"))
+ else:
+ client.sendall(str.encode("{\"return\": []}\n"))
+ elif cmd["exec-helper"] == "clear-events":
+ events.clear()
+ client.sendall(str.encode("{\"return\": {}}\n"))
+ else:
+ client.sendall(str.encode("{\"error\": \"Unknown helper command\"}\n"))
+
+def oob_helper(qmp, server):
+ max_events = max(100, int(OCF_RESKEY_max_disk_errors))
+ events = {}
+ try:
+ os.close(0)
+ os.close(1)
+ os.close(2)
+ logging.shutdown()
+
+ client = None
+ while True:
+ if client:
+ watch = [client, qmp]
+ else:
+ watch = [server, qmp]
+ sel = select.select(watch, [], [])
+ try:
+ if client in sel[0]:
+ cmd = recv_line(client)
+ if len(cmd) == 0:
+ # client socket was closed: wait for new client
+ client.close()
+ client = None
+ continue
+ else:
+ parsed = json.loads(cmd)
+ if ("exec-helper" in parsed):
+ oob_helper_exec(client, parsed, events)
+ else:
+ qmp.sendall(str.encode(cmd))
+ if qmp in sel[0]:
+ answer = recv_line(qmp)
+ if len(answer) == 0:
+ # qmp socket was closed: qemu died, exit
+ os._exit(0)
+ else:
+ parsed = json.loads(answer)
+ if ("event" in parsed):
+ event = parsed["event"]
+ if (event not in events):
+ events[event] = []
+ if len(events[event]) < max_events:
+ events[event].append(parsed)
+ elif client:
+ client.sendall(str.encode(answer))
+ if server in sel[0]:
+ client, client_addr = server.accept()
+ except socket.error as e:
+ pass
+ except Exception as e:
+ with open(HELPER_LOG, 'a') as f:
+ f.write(str(e) + "\n")
+ os._exit(0)
+
+# Fork off helper to keep the oob qmp connection open and to catch events
+def oob_helper_open():
+ try:
+ qmp = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ qmp.connect(QMP_SOCK)
+ qmp_execute(qmp, [{"execute": "qmp_capabilities", "arguments":
{"enable": ["oob"]}}])
+ except socket.error as e:
+ log.error("while connecting to qmp socket: %s" % e)
+ raise Error()
+
+ try:
+ if os.path.exists(HELPER_SOCK):
+ os.unlink(HELPER_SOCK)
+ server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ server.bind(HELPER_SOCK)
+ server.listen(1)
+ except socket.error as e:
+ log.error("while opening helper socket: %s" % e)
+ raise Error()
+
+ qmp.set_inheritable(True)
+ server.set_inheritable(True)
+
+ try:
+ pid = os.fork()
+ except OSError as e:
+ log.error("while forking off oob helper: %s" % e)
+ raise Error()
+
+ if pid == 0:
+ # child 1: Exits after forking off child 2, so pid 1 will become
+ # responsible for the child
+ os.setsid()
+
+ pid = os.fork()
+
+ if pid == 0:
+ # child 2: here the actual work is being done
+ oob_helper(qmp, server)
+ else:
+ os._exit(0)
+
+ qmp.close()
+ server.close()
+
+# Get the disk size of the (user supplied) parent disk
+def qmp_get_disk_size(fd):
+ block_nodes = qmp_execute(fd, [{"execute": "query-named-block-nodes",
"arguments": {"flat": True}}])
+ for node in block_nodes["return"]:
+ if node["node-name"] == "parent0":
+ return node["image"]["virtual-size"]
+
+ log.error("Disk \"parent0\" not found")
+ raise Error()
+
+# Get the host of the nbd node
+def qmp_get_nbd_remote(fd):
+ block_nodes = qmp_execute(fd, [{"execute": "query-named-block-nodes",
"arguments": {"flat": True}}])
+ for node in block_nodes["return"]:
+ if node["node-name"] == "nbd0":
+ url = str(node["image"]["filename"])
+ return str.split(url, "//")[1].split("/")[0].split(":")[0]
+ return None
+
+# Check if we are currently resyncing
+def qmp_check_resync(fd):
+ answer = qmp_execute(fd, [{"execute": "query-block-jobs"}])
+ for job in answer["return"]:
+ if job["device"] == "resync":
+ return job
+ return None
+
+def qmp_start_resync(fd, remote):
+ answer = qmp_execute(fd, [{"execute": "blockdev-add", "arguments":
{"driver": "nbd", "node-name": "nbd0", "server": {"type": "inet", "host":
str(remote), "port": str(NBD_PORT)}, "export": "parent0", "detect-zeroes":
"on"}}], ignore_error = True)
+ if "error" in answer:
+ log.warning("Failed to add nbd node: %s" % json.dumps(answer))
+ log.warning("Assuming peer failure")
+ report_remote_failure(remote)
+ else:
+ qmp_execute(fd, [{"execute": "blockdev-mirror", "arguments":
{"device": "colo-disk0", "job-id": "resync", "target": "nbd0", "sync": "full",
"on-target-error": "report", "on-source-error": "ignore", "auto-dismiss":
False}}])
+
+def qmp_cancel_resync(fd):
+ timeout = START_TIME + (int(OCF_RESKEY_yank_timeout)/1000)
+
+ if qmp_check_resync(fd)["status"] != "concluded":
+ qmp_execute(fd, [{"execute": "block-job-cancel", "arguments":
{"device": "resync", "force": True}}], ignore_error = True)
+ # Wait for the block-job to finish
+ while time.time() < timeout:
+ if qmp_check_resync(fd)["status"] == "concluded":
+ break
+ log.debug("Waiting for block-job to finish in qmp_cancel_resync()")
+ time.sleep(1)
+ else:
+ log.warning("Timed out, trying to unfreeze qemu")
+ yank(fd)
+ while qmp_check_resync(fd)["status"] != "concluded":
+ log.debug("Waiting for block-job to finish")
+ time.sleep(1)
+
+ qmp_execute(fd, [
+ {"execute": "block-job-dismiss", "arguments": {"id": "resync"}},
+ {"execute": "blockdev-del", "arguments": {"node-name": "nbd0"}}
+ ])
+
+def qmp_start_colo(fd, remote):
+ # Check if we have a filter-rewriter
+ answer = qmp_execute(fd, [{"execute": "qom-list", "arguments": {"path":
"/objects/rew0"}}], ignore_error = True)
+ if "error" in answer:
+ if answer["error"]["class"] == "DeviceNotFound":
+ have_filter_rewriter = False
+ else:
+ log.error("While checking for filter-rewriter:\n%s" \
+ % json.dumps(answer))
+ raise Error()
+ else:
+ have_filter_rewriter = True
+
+ # Pause VM and cancel resync
+ qmp_execute(fd, [
+ {"execute": "stop"},
+ {"execute": "block-job-cancel", "arguments": {"device": "resync"}}
+ ])
+
+ # Wait for the block-job to finish
+ while qmp_check_resync(fd)["status"] != "concluded":
+ log.debug("Waiting for block-job to finish in qmp_start_colo()")
+ time.sleep(1)
+
+ # Add nbd to the quorum node
+ qmp_execute(fd, [
+ {"execute": "block-job-dismiss", "arguments": {"id": "resync"}},
+ {"execute": "x-blockdev-change", "arguments": {"parent": "colo-disk0",
"node": "nbd0"}}
+ ])
+
+ # Connect mirror and compare_in to secondary
+ qmp_execute(fd, [
+ {"execute": "chardev-add", "arguments": {"id": "comp_pri_in0<",
"backend": {"type": "socket", "data": {"addr": {"type": "unix", "data":
{"path": str(COMP_SOCK)}}, "server": True}}}},
+ {"execute": "chardev-add", "arguments": {"id": "comp_pri_in0>",
"backend": {"type": "socket", "data": {"addr": {"type": "unix", "data":
{"path": str(COMP_SOCK)}}, "server": False}}}},
+ {"execute": "chardev-add", "arguments": {"id": "comp_out0<",
"backend": {"type": "socket", "data": {"addr": {"type": "unix", "data":
{"path": str(COMP_OUT_SOCK)}}, "server": True}}}},
+ {"execute": "chardev-add", "arguments": {"id": "comp_out0>",
"backend": {"type": "socket", "data": {"addr": {"type": "unix", "data":
{"path": str(COMP_OUT_SOCK)}}, "server": False}}}},
+ {"execute": "chardev-add", "arguments": {"id": "mirror0", "backend":
{"type": "socket", "data": {"addr": {"type": "inet", "data": {"host":
str(remote), "port": str(MIRROR_PORT)}}, "server": False, "nodelay": True }}}},
+ {"execute": "chardev-add", "arguments": {"id": "comp_sec_in0",
"backend": {"type": "socket", "data": {"addr": {"type": "inet", "data":
{"host": str(remote), "port": str(COMPARE_IN_PORT)}}, "server": False,
"nodelay": True }}}}
+ ])
+
+ # Add the COLO filters
+ vnet_hdr_support = is_true(OCF_RESKEY_vnet_hdr)
+ if have_filter_rewriter:
+ qmp_execute(fd, [
+ {"execute": "object-add", "arguments": {"qom-type":
"filter-mirror", "id": "m0", "props": {"insert": "before", "position":
"id=rew0", "netdev": "hn0", "queue": "tx", "outdev": "mirror0",
"vnet_hdr_support": vnet_hdr_support}}},
+ {"execute": "object-add", "arguments": {"qom-type":
"filter-redirector", "id": "redire0", "props": {"insert": "before", "position":
"id=rew0", "netdev": "hn0", "queue": "rx", "indev": "comp_out0<",
"vnet_hdr_support": vnet_hdr_support}}},
+ {"execute": "object-add", "arguments": {"qom-type":
"filter-redirector", "id": "redire1", "props": {"insert": "before", "position":
"id=rew0", "netdev": "hn0", "queue": "rx", "outdev": "comp_pri_in0<",
"vnet_hdr_support": vnet_hdr_support}}},
+ {"execute": "object-add", "arguments": {"qom-type": "iothread",
"id": "iothread1"}},
+ {"execute": "object-add", "arguments": {"qom-type":
"colo-compare", "id": "comp0", "props": {"primary_in": "comp_pri_in0>",
"secondary_in": "comp_sec_in0", "outdev": "comp_out0>", "iothread":
"iothread1", "compare_timeout": int(OCF_RESKEY_compare_timeout),
"expired_scan_cycle": int(OCF_RESKEY_expired_scan_cycle), "max_queue_size":
int(OCF_RESKEY_max_queue_size), "vnet_hdr_support": vnet_hdr_support}}}
+ ])
+ else:
+ qmp_execute(fd, [
+ {"execute": "object-add", "arguments": {"qom-type":
"filter-mirror", "id": "m0", "props": {"netdev": "hn0", "queue": "tx",
"outdev": "mirror0", "vnet_hdr_support": vnet_hdr_support}}},
+ {"execute": "object-add", "arguments": {"qom-type":
"filter-redirector", "id": "redire0", "props": {"netdev": "hn0", "queue": "rx",
"indev": "comp_out0<", "vnet_hdr_support": vnet_hdr_support}}},
+ {"execute": "object-add", "arguments": {"qom-type":
"filter-redirector", "id": "redire1", "props": {"netdev": "hn0", "queue": "rx",
"outdev": "comp_pri_in0<", "vnet_hdr_support": vnet_hdr_support}}},
+ {"execute": "object-add", "arguments": {"qom-type": "iothread",
"id": "iothread1"}},
+ {"execute": "object-add", "arguments": {"qom-type":
"colo-compare", "id": "comp0", "props": {"primary_in": "comp_pri_in0>",
"secondary_in": "comp_sec_in0", "outdev": "comp_out0>", "iothread":
"iothread1", "compare_timeout": int(OCF_RESKEY_compare_timeout),
"expired_scan_cycle": int(OCF_RESKEY_expired_scan_cycle), "max_queue_size":
int(OCF_RESKEY_max_queue_size), "vnet_hdr_support": vnet_hdr_support}}}
+ ])
+
+ # Start COLO
+ qmp_execute(fd, [
+ {"execute": "migrate-set-capabilities", "arguments": {"capabilities":
[{"capability": "x-colo", "state": True }] }},
+ {"execute": "migrate-set-parameters", "arguments":
{"x-checkpoint-delay": int(OCF_RESKEY_checkpoint_interval) }},
+ {"execute": "migrate", "arguments": {"uri": "tcp:%s:%s" % (remote,
MIGRATE_PORT)}}
+ ])
+
+ # Wait for COLO to start
+ while qmp_execute(fd, [{"execute": "query-status"}])["return"]["status"] \
+ == "paused" \
+ or qmp_execute(fd, [{"execute":
"query-colo-status"}])["return"]["mode"] \
+ != "primary" :
+ log.debug("Waiting for colo replication to start")
+ time.sleep(1)
+
+def qmp_primary_failover(fd):
+ qmp_execute(fd, [
+ {"execute": "object-del", "arguments": {"id": "m0"}},
+ {"execute": "object-del", "arguments": {"id": "redire0"}},
+ {"execute": "object-del", "arguments": {"id": "redire1"}},
+ {"execute": "x-colo-lost-heartbeat"},
+ {"execute": "object-del", "arguments": {"id": "comp0"}},
+ {"execute": "object-del", "arguments": {"id": "iothread1"}},
+ {"execute": "x-blockdev-change", "arguments": {"parent": "colo-disk0",
"child": "children.1"}},
+ {"execute": "blockdev-del", "arguments": {"node-name": "nbd0"}},
+ {"execute": "chardev-remove", "arguments": {"id": "mirror0"}},
+ {"execute": "chardev-remove", "arguments": {"id": "comp_sec_in0"}},
+ {"execute": "chardev-remove", "arguments": {"id": "comp_pri_in0>"}},
+ {"execute": "chardev-remove", "arguments": {"id": "comp_pri_in0<"}},
+ {"execute": "chardev-remove", "arguments": {"id": "comp_out0>"}},
+ {"execute": "chardev-remove", "arguments": {"id": "comp_out0<"}}
+ ])
+
+def qmp_secondary_failover(fd):
+ qmp_execute(fd, [
+ {"execute": "nbd-server-stop"},
+ {"execute": "object-del", "arguments": {"id": "f2"}},
+ {"execute": "object-del", "arguments": {"id": "f1"}},
+ {"execute": "x-colo-lost-heartbeat"},
+ {"execute": "chardev-remove", "arguments": {"id": "red1"}},
+ {"execute": "chardev-remove", "arguments": {"id": "red0"}},
+ ])
+
+def qmp_is_colo_active(fd):
+ answer = qmp_execute(fd, [{"execute": "query-colo-status"}])
+
+ if answer["return"]["mode"] != "none":
+ return True
+ else:
+ return False
+
+# Check qemu health and colo role
+def qmp_check_health(fd, do_yank = True):
+ answer = qmp_execute(fd, [{"execute": "query-status"}], do_yank = do_yank)
+ vm_status = answer["return"]
+
+ answer = qmp_execute(fd, [{"execute": "query-colo-status"}], \
+ do_yank = do_yank)
+ colo_status = answer["return"]
+
+ if vm_status["status"] == "inmigrate" \
+ or vm_status["status"] == "shutdown":
+ role = OCF_SUCCESS
+ replication = OCF_NOT_RUNNING
+
+ elif (vm_status["status"] == "running" \
+ or vm_status["status"] == "colo" \
+ or vm_status["status"] == "finish-migrate") \
+ and colo_status["mode"] == "none" \
+ and (colo_status["reason"] == "request" \
+ or colo_status["reason"] == "none"):
+ role = OCF_RUNNING_MASTER
+ replication = OCF_NOT_RUNNING
+
+ elif (vm_status["status"] == "running" \
+ or vm_status["status"] == "colo" \
+ or vm_status["status"] == "finish-migrate") \
+ and colo_status["mode"] == "secondary":
+ role = OCF_SUCCESS
+ replication = OCF_SUCCESS
+
+ elif (vm_status["status"] == "running" \
+ or vm_status["status"] == "colo" \
+ or vm_status["status"] == "finish-migrate") \
+ and colo_status["mode"] == "primary":
+ role = OCF_RUNNING_MASTER
+ replication = OCF_SUCCESS
+
+ else:
+ log.error("Invalid qemu status:\nvm status: %s\ncolo status: %s" \
+ % (vm_status, colo_status))
+ role = OCF_ERR_GENERIC
+ replication = OCF_ERR_GENERIC
+
+ return role, replication
+
+# Sanity checks: check parameters, files, binaries, etc.
+def qemu_colo_validate_all():
+ # Check resource parameters
+ if not str.isdigit(OCF_RESKEY_base_port):
+ log.error("base_port needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_checkpoint_interval):
+ log.error("checkpoint_interval needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_compare_timeout):
+ log.error("compare_timeout needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_expired_scan_cycle):
+ log.error("expired_scan_cycle needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_max_queue_size):
+ log.error("max_queue_size needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_max_disk_errors):
+ log.error("max_disk_errors needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_monitor_timeout):
+ log.error("monitor_timeout needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_yank_timeout):
+ log.error("yank_timeout needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_fail_fast_timeout):
+ log.error("fail_fast_timeout needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not str.isdigit(OCF_RESKEY_debug):
+ log.error("debug needs to be a number")
+ return OCF_ERR_CONFIGURED
+
+ if not OCF_RESKEY_active_hidden_dir:
+ log.error("active_hidden_dir needs to be specified")
+ return OCF_ERR_CONFIGURED
+
+ # Check resource meta configuration
+ if OCF_ACTION != "stop":
+ if OCF_RESKEY_CRM_meta_master_max != 1:
+ log.error("only one master allowed")
+ return OCF_ERR_CONFIGURED
+
+ if OCF_RESKEY_CRM_meta_clone_max > 2:
+ log.error("maximum 2 clones allowed")
+ return OCF_ERR_CONFIGURED
+
+ if OCF_RESKEY_CRM_meta_master_node_max != 1:
+ log.error("only one master per node allowed")
+ return OCF_ERR_CONFIGURED
+
+ if OCF_RESKEY_CRM_meta_clone_node_max != 1:
+ log.error("only one clone per node allowed")
+ return OCF_ERR_CONFIGURED
+
+ # Check if notify is enabled
+ if OCF_ACTION != "stop" and OCF_ACTION != "monitor":
+ if not is_true(OCF_RESKEY_CRM_meta_notify) \
+ and not OCF_RESKEY_CRM_meta_notify_start_uname:
+ log.error("notify needs to be enabled")
+ return OCF_ERR_CONFIGURED
+
+ # Check that globally-unique is disabled
+ if is_true(OCF_RESKEY_CRM_meta_globally_unique):
+ log.error("globally-unique needs to be disabled")
+ return OCF_ERR_CONFIGURED
+
+ # Check binaries
+ if not check_binary(OCF_RESKEY_qemu_binary):
+ return OCF_ERR_INSTALLED
+
+ if not check_binary(OCF_RESKEY_qemu_img_binary):
+ return OCF_ERR_INSTALLED
+
+ # Check paths and files
+ if not is_writable(OCF_RESKEY_active_hidden_dir) \
+ or not os.path.isdir(OCF_RESKEY_active_hidden_dir):
+ log.error("active and hidden image directory missing or not writable")
+ return OCF_ERR_PERM
+
+ return OCF_SUCCESS
+
+# Check if qemu is running
+def check_pid():
+ if not os.path.exists(PID_FILE):
+ return OCF_NOT_RUNNING, None
+
+ fd = open(PID_FILE, "r")
+ pid = int(str.strip(fd.readline()))
+ fd.close()
+ try:
+ os.kill(pid, 0)
+ except OSError:
+ log.info("qemu is not running")
+ return OCF_NOT_RUNNING, pid
+ else:
+ return OCF_SUCCESS, pid
+
+def qemu_colo_monitor(fail_fast = False):
+ status, pid = check_pid()
+ if status != OCF_SUCCESS:
+ return status, OCF_NOT_RUNNING
+
+ fd = qmp_open(fail_fast)
+
+ role, replication = qmp_check_health(fd, do_yank = not fail_fast)
+ if role != OCF_SUCCESS and role != OCF_RUNNING_MASTER:
+ return role, replication
+
+ colo_events = qmp_execute(fd, [{"exec-helper": "get-events", "arguments":
{"event": "COLO_EXIT"}}], do_yank = False)
+ for event in colo_events["return"]:
+ if event["data"]["reason"] == "error":
+ if replication == OCF_SUCCESS:
+ replication = OCF_ERR_GENERIC
+
+ if did_yank and replication == OCF_SUCCESS:
+ replication = OCF_ERR_GENERIC
+
+ peer_disk_errors = 0
+ local_disk_errors = 0
+ quorum_events = qmp_execute(fd, [{"exec-helper": "get-events",
"arguments": {"event": "QUORUM_REPORT_BAD"}}], do_yank = False)
+ for event in quorum_events["return"]:
+ if event["data"]["node-name"] == "nbd0":
+ if event["data"]["type"] == "read":
+ peer_disk_errors += 1
+ else:
+ peer_disk_errors += int(OCF_RESKEY_max_disk_errors)
+ else:
+ if event["data"]["type"] == "read":
+ local_disk_errors += 1
+ else:
+ local_disk_errors += int(OCF_RESKEY_max_disk_errors)
+
+ if int(OCF_RESKEY_max_disk_errors) != 0:
+ if peer_disk_errors >= int(OCF_RESKEY_max_disk_errors):
+ log.error("Peer disk error")
+ if replication == OCF_SUCCESS:
+ replication = OCF_ERR_GENERIC
+
+ if local_disk_errors >= int(OCF_RESKEY_max_disk_errors):
+ if replication == OCF_SUCCESS:
+ log.error("Local disk error")
+ role = OCF_ERR_GENERIC
+ else:
+ log.warning("Local disk error")
+
+ if not fail_fast and OCF_RESKEY_CRM_meta_interval != 0:
+ # This isn't a probe monitor
+ block_job = qmp_check_resync(fd)
+ if block_job:
+ if "error" in block_job:
+ log.error("resync error: %s" % block_job["error"])
+ peer = qmp_get_nbd_remote(fd)
+ qmp_cancel_resync(fd)
+ report_remote_failure(peer)
+ elif block_job["ready"] == True:
+ log.info("resync done, starting colo")
+ peer = qmp_get_nbd_remote(fd)
+ qmp_start_colo(fd, peer)
+ # COLO started, our secondary now can be promoted if the
+ # primary fails
+ set_remote_master_score(peer, 100)
+ else:
+ pct_done = (float(block_job["offset"]) \
+ / float(block_job["len"])) * 100
+ log.info("resync %.1f%% done" % pct_done)
+ else:
+ if replication == OCF_ERR_GENERIC:
+ if role == OCF_RUNNING_MASTER:
+ log.error("Replication error")
+ peer = qmp_get_nbd_remote(fd)
+ if peer:
+ report_remote_failure(peer)
+ else:
+ log.warning("Replication error")
+ qmp_execute(fd, [{"exec-helper": "clear-events"}], do_yank = False)
+
+ fd.close()
+
+ return role, replication
+
+def qemu_colo_start():
+ if check_pid()[0] == OCF_SUCCESS:
+ log.info("qemu is already running")
+ return OCF_SUCCESS
+
+ rotate_logfile(QMP_LOG, 8)
+ rotate_logfile(QEMU_LOG, 8)
+
+ run_command(QEMU_DUMMY_CMDLINE)
+ oob_helper_open()
+ fd = qmp_open()
+ disk_size = qmp_get_disk_size(fd)
+ fd.close()
+ _qemu_colo_stop(OCF_SUCCESS, False)
+
+ run_command("'%s' create -q -f qcow2 %s %s" \
+ % (OCF_RESKEY_qemu_img_binary, ACTIVE_IMAGE, disk_size))
+ run_command("'%s' create -q -f qcow2 %s %s" \
+ % (OCF_RESKEY_qemu_img_binary, HIDDEN_IMAGE, disk_size))
+
+ run_command(QEMU_SECONDARY_CMDLINE)
+ oob_helper_open()
+
+ fd = qmp_open()
+ qmp_execute(fd, [
+ {"execute": "nbd-server-start", "arguments": {"addr": {"type": "inet",
"data": {"host": str(OCF_RESKEY_listen_address), "port": str(NBD_PORT)}}}},
+ {"execute": "nbd-server-add", "arguments": {"device": "parent0",
"writable": True}}
+ ])
+ fd.close()
+
+ return OCF_SUCCESS
+
+def env_do_shutdown_guest():
+ return OCF_RESKEY_CRM_meta_notify_active_uname \
+ and OCF_RESKEY_CRM_meta_notify_stop_uname \
+ and str.strip(OCF_RESKEY_CRM_meta_notify_active_uname) \
+ == str.strip(OCF_RESKEY_CRM_meta_notify_stop_uname)
+
+def env_find_secondary():
+ # slave(s) =
+ # OCF_RESKEY_CRM_meta_notify_slave_uname
+ # - OCF_RESKEY_CRM_meta_notify_stop_uname
+ # + OCF_RESKEY_CRM_meta_notify_start_uname
+ # Filter out hosts that are stopping and ourselves
+ for host in str.split(OCF_RESKEY_CRM_meta_notify_slave_uname, " "):
+ if host:
+ for stopping_host \
+ in str.split(OCF_RESKEY_CRM_meta_notify_stop_uname, " "):
+ if host == stopping_host:
+ break
+ else:
+ if host != HOSTNAME:
+ # we found a valid secondary
+ return host
+
+ for host in str.split(OCF_RESKEY_CRM_meta_notify_start_uname, " "):
+ if host != HOSTNAME:
+ # we found a valid secondary
+ return host
+
+ # we found no secondary
+ return None
+
+def _qemu_colo_stop(monstatus, shutdown_guest):
+ # stop action must do everything possible to stop the resource
+ try:
+ timeout = START_TIME + (int(OCF_RESKEY_CRM_meta_timeout)/1000) - 5
+ force_stop = False
+
+ if monstatus == OCF_NOT_RUNNING:
+ log.info("resource is already stopped")
+ return OCF_SUCCESS
+ elif monstatus == OCF_RUNNING_MASTER or monstatus == OCF_SUCCESS:
+ force_stop = False
+ else:
+ force_stop = True
+
+ if not force_stop:
+ executed_quit = False
+
+ fd = qmp_open(fail_fast = True)
+ if shutdown_guest:
+ qmp_execute(fd, [{"execute": "system_powerdown"}], \
+ do_yank = False)
+ else:
+ qmp_execute(fd, [{"execute": "quit"}], do_yank = False)
+ fd.close()
+ executed_quit = True
+
+ # wait for qemu to stop
+ while time.time() < timeout:
+ status, pid = check_pid()
+ if status == OCF_NOT_RUNNING:
+ # qemu stopped
+ return OCF_SUCCESS
+ elif status == OCF_SUCCESS and not executed_quit:
+ vmstatus = qmp_execute(fd, [{"execute": "query-status"}], \
+ do_yank = False)
+ if vmstatus["return"]["status"] == "shutdown":
+ qmp_execute(fd, [{"execute": "quit"}], do_yank = False)
+ fd.close()
+ executed_quit = True
+ log.debug("Waiting for guest to shutdown")
+ time.sleep(1)
+ elif status == OCF_SUCCESS and executed_quit:
+ log.debug("Waiting for qemu to stop")
+ time.sleep(1)
+ else:
+ # something went wrong, force stop instead
+ break
+
+ log.warning("clean stop timeout reached")
+ except Exception as e:
+ log.warning("error while stopping: %s" % e)
+
+ log.info("force stopping qemu")
+
+ status, pid = check_pid()
+ if status == OCF_NOT_RUNNING:
+ return OCF_SUCCESS
+ try:
+ if int(OCF_RESKEY_debug) >= 2:
+ os.kill(pid, signal.SIGSEGV)
+ else:
+ os.kill(pid, signal.SIGTERM)
+ time.sleep(2)
+ os.kill(pid, signal.SIGKILL)
+ except Exception:
+ pass
+
+ while check_pid()[0] != OCF_NOT_RUNNING:
+ time.sleep(1)
+
+ return OCF_SUCCESS
+
+def qemu_colo_stop():
+ shutdown_guest = env_do_shutdown_guest()
+
+ try:
+ role, replication = qemu_colo_monitor(fail_fast = True)
+ except Exception:
+ role, replication = OCF_ERR_GENERIC, OCF_ERR_GENERIC
+
+ status = _qemu_colo_stop(role, shutdown_guest)
+
+ if HOSTNAME == str.strip(OCF_RESKEY_CRM_meta_notify_master_uname):
+ if str.strip(OCF_RESKEY_CRM_meta_notify_promote_uname) \
+ and str.strip(OCF_RESKEY_CRM_meta_notify_promote_uname) !=
HOSTNAME:
+ # We where primary and the secondary is to be promoted.
+ # We are going to be out of date.
+ set_master_score(0)
+ else:
+ if role == OCF_RUNNING_MASTER:
+ # We where a healthy primary but had no healty secondary or it
+ # was stopped as well. So we have up-to-date data.
+ set_master_score(10)
+ else:
+ # We where a unhealthy primary but also had no healty
secondary.
+ # So we still should have up-to-date data.
+ set_master_score(5)
+ else:
+ if get_master_score() > 10:
+ if role == OCF_SUCCESS:
+ if shutdown_guest:
+ # We where a healthy secondary and (probably) had a healthy
+ # primary and both where stopped. So we have up-to-date
data
+ # too.
+ set_master_score(10)
+ else:
+ # We where a healthy secondary and (probably) had a healthy
+ # primary still running. So we are now out of date.
+ set_master_score(0)
+ else:
+ # We where a unhealthy secondary. So we are now out of date.
+ set_master_score(0)
+
+ return status
+
+def qemu_colo_notify():
+ action = "%s-%s" % (OCF_RESKEY_CRM_meta_notify_type, \
+ OCF_RESKEY_CRM_meta_notify_operation)
+
+ if action == "post-start":
+ if HOSTNAME == str.strip(OCF_RESKEY_CRM_meta_notify_master_uname):
+ peer = str.strip(OCF_RESKEY_CRM_meta_notify_start_uname)
+ fd = qmp_open()
+ qmp_start_resync(fd, peer)
+ # The secondary has inconsistent data until resync is finished
+ set_remote_master_score(peer, 0)
+ fd.close()
+
+ elif action == "pre-stop":
+ if not env_do_shutdown_guest() \
+ and HOSTNAME == str.strip(OCF_RESKEY_CRM_meta_notify_master_uname) \
+ and HOSTNAME != str.strip(OCF_RESKEY_CRM_meta_notify_stop_uname):
+ fd = qmp_open()
+ peer = qmp_get_nbd_remote(fd)
+ log.debug("our peer: %s" % peer)
+ if peer == str.strip(OCF_RESKEY_CRM_meta_notify_stop_uname):
+ if qmp_check_resync(fd):
+ qmp_cancel_resync(fd)
+ elif qmp_is_colo_active(fd):
+ qmp_primary_failover(fd)
+ qmp_execute(fd, [{"exec-helper":
"clear-events"}],do_yank=False)
+ fd.close()
+
+ elif action == "post-stop" \
+ and OCF_RESKEY_CRM_meta_notify_key_operation == "stonith" \
+ and (HOSTNAME == str.strip(OCF_RESKEY_CRM_meta_notify_master_uname)
+ or str.strip(OCF_RESKEY_CRM_meta_notify_promote_uname)):
+ peer = str.strip(OCF_RESKEY_CRM_meta_notify_stop_uname)
+ set_remote_master_score(peer, 0)
+
+ return OCF_SUCCESS
+
+def qemu_colo_promote():
+ role, replication = qemu_colo_monitor()
+
+ if role == OCF_SUCCESS and replication == OCF_NOT_RUNNING:
+ status = _qemu_colo_stop(OCF_SUCCESS, False)
+ if status != OCF_SUCCESS:
+ return status
+
+ rotate_logfile(QMP_LOG, 8)
+ rotate_logfile(QEMU_LOG, 8)
+ run_command(QEMU_PRIMARY_CMDLINE)
+ oob_helper_open()
+ set_master_score(101)
+
+ peer = env_find_secondary()
+ if peer:
+ fd = qmp_open()
+ qmp_start_resync(fd, peer)
+ # The secondary has inconsistent data until resync is finished
+ set_remote_master_score(peer, 0)
+ fd.close()
+ return OCF_SUCCESS
+ elif role == OCF_SUCCESS and replication != OCF_NOT_RUNNING:
+ fd = qmp_open()
+ qmp_secondary_failover(fd)
+ set_master_score(101)
+
+ peer = env_find_secondary()
+ if peer:
+ qmp_start_resync(fd, peer)
+ # The secondary has inconsistent data until resync is finished
+ set_remote_master_score(peer, 0)
+ qmp_execute(fd, [{"exec-helper": "clear-events"}], do_yank=False)
+ fd.close()
+ return OCF_SUCCESS
+ else:
+ return OCF_ERR_GENERIC
+
+def qemu_colo_demote():
+ status = qemu_colo_stop()
+ if status != OCF_SUCCESS:
+ return status
+ return qemu_colo_start()
+
+
+if OCF_ACTION == "meta-data":
+ qemu_colo_meta_data()
+ exit(OCF_SUCCESS)
+
+logs_open()
+
+status = qemu_colo_validate_all()
+# Exit here if our sanity checks fail, but try to continue if we need to stop
+if status != OCF_SUCCESS and OCF_ACTION != "stop":
+ exit(status)
+
+setup_constants()
+
+try:
+ if OCF_ACTION == "start":
+ status = qemu_colo_start()
+ elif OCF_ACTION == "stop":
+ status = qemu_colo_stop()
+ elif OCF_ACTION == "monitor":
+ status = qemu_colo_monitor()[0]
+ elif OCF_ACTION == "notify":
+ status = qemu_colo_notify()
+ elif OCF_ACTION == "promote":
+ status = qemu_colo_promote()
+ elif OCF_ACTION == "demote":
+ status = qemu_colo_demote()
+ elif OCF_ACTION == "validate-all":
+ status = qemu_colo_validate_all()
+ else:
+ status = OCF_ERR_UNIMPLEMENTED
+except Error:
+ exit(OCF_ERR_GENERIC)
+else:
+ exit(status)
--
2.20.1
pgpxJkA3jwxPD.pgp
Description: OpenPGP digital signature
- [PATCH v3 0/7] colo: Introduce resource agent and test suite/CI, Lukas Straub, 2020/08/04
- [PATCH v3 2/7] avocado_qemu: Introduce pick_qemu_util to pick qemu utility binaries, Lukas Straub, 2020/08/04
- [PATCH v3 1/7] block/quorum.c: stable children names, Lukas Straub, 2020/08/04
- [PATCH v3 3/7] boot_linux.py: Use pick_qemu_util, Lukas Straub, 2020/08/04
- [PATCH v3 4/7] colo: Introduce resource agent,
Lukas Straub <=
- [PATCH v3 6/7] configure,Makefile: Install colo resource-agent, Lukas Straub, 2020/08/04
- [PATCH v3 5/7] colo: Introduce high-level test suite, Lukas Straub, 2020/08/04
- [PATCH v3 7/7] MAINTAINERS: Add myself as maintainer for COLO resource agent, Lukas Straub, 2020/08/04
- Re: [PATCH v3 0/7] colo: Introduce resource agent and test suite/CI, Lukas Straub, 2020/08/18