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Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks
From: |
Tomoki Sekiyama |
Subject: |
Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks |
Date: |
Fri, 07 Dec 2012 17:39:32 +0900 |
User-agent: |
StGit/0.16 |
Adds sample hook scripts for --fsfreeze-hook option of qemu-ga.
- fsfreeze-hook : execute scripts in fsfreeze-hook.d/
- fsfreeze-hook.d/mysql-flush.sh.sample : quiesce MySQL before snapshot
Signed-off-by: Tomoki Sekiyama <address@hidden>
---
.gitignore | 1
Makefile | 2 -
scripts/qemu-guest-agent/fsfreeze-hook | 33 ++++++++++++
.../fsfreeze-hook.d/mysql-flush.sh.sample | 55 ++++++++++++++++++++
4 files changed, 90 insertions(+), 1 deletion(-)
create mode 100755 scripts/qemu-guest-agent/fsfreeze-hook
create mode 100755
scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample
diff --git a/.gitignore b/.gitignore
index bd6ba1c..286822d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -93,3 +93,4 @@ cscope.*
tags
TAGS
*~
+!scripts/qemu-guest-agent/fsfreeze-hook.d
diff --git a/Makefile b/Makefile
index 9ecbcbb..466dcd7 100644
--- a/Makefile
+++ b/Makefile
@@ -248,7 +248,7 @@ clean:
# avoid old build problems by removing potentially incorrect old files
rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h
gen-op-arm.h
rm -f qemu-options.def
- find . -name '*.[od]' -exec rm -f {} +
+ find . -name '*.[od]' -type f -exec rm -f {} +
rm -f *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* *.pod *~ */*~
rm -Rf .libs
rm -f qemu-img-cmds.h
diff --git a/scripts/qemu-guest-agent/fsfreeze-hook
b/scripts/qemu-guest-agent/fsfreeze-hook
new file mode 100755
index 0000000..4f7ff15
--- /dev/null
+++ b/scripts/qemu-guest-agent/fsfreeze-hook
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# This script is executed when a guest agent receives fsfreeze-freeze and
+# fsfreeze-thaw command, if it is specified in --fsfreeze-hook (-F)
+# option of qemu-ga or placed in default path (/etc/qemu/fsfreeze-hook).
+# When the agent receives fsfreeze-freeze request, this script is issued with
+# "freeze" argument before the filesystem is freezed. And for fsfreeze-thaw
+# request, it is issued with "thaw" argument after filesystem is thawed.
+
+LOGFILE=/var/log/qga-fsfreeze-hook.log
+FSFREEZE_D=$(dirname -- "$0")/fsfreeze-hook.d
+
+# Check whether file $1 is a backup or rpm-generated file and should be ignored
+is_ignored_file() {
+ case "$1" in
+ *~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample)
+ return 0 ;;
+ esac
+ return 1
+}
+
+# Iterate executables in directory "fsfreeze-hook.d" with the specified args
+[ ! -d "$FSFREEZE_D" ] && exit 1
+for file in "$FSFREEZE_D"/* ; do
+ is_ignored_file "$file" && continue
+ [ -x "$file" ] || continue
+ echo "$(date): execute $file $@" >>$LOGFILE
+ "$file" "$@" >>$LOGFILE 2>&1
+ STATUS=$?
+ echo "$(date): $file finished with status=$STATUS" >>$LOGFILE
+done
+
+exit 0
diff --git a/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample
b/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample
new file mode 100755
index 0000000..c69b8ad
--- /dev/null
+++ b/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample
@@ -0,0 +1,55 @@
+#!/bin/sh
+
+# Flush MySQL tables to the disk before the filesystem is freezed.
+# At the same time, this keeps a read lock in order to avoid write accesses
+# from the other clients until the filesystem is thawed.
+
+MYSQL="/usr/bin/mysql"
+MYSQL_OPTS="-uroot" #"-prootpassword"
+FIFO=/tmp/mysql-flush.fifo
+MYSQL_CMD="$MYSQL $MYSQL_OPTS"
+
+# Check mysql is installed and the server running
+[ -x $MYSQL ] && $MYSQL_CMD < /dev/null || exit 0
+
+flush_and_wait() {
+ printf "FLUSH TABLES WITH READ LOCK \\G\n"
+ read < $FIFO
+ printf "UNLOCK TABLES \\G\n"
+}
+
+case "$1" in
+ freeze)
+ mkfifo $FIFO || exit 1
+ flush_and_wait | $MYSQL_CMD &
+ # wait until every block is flushed
+ while [ "$(echo 'SHOW STATUS LIKE "Key_blocks_not_flushed"' |\
+ $MYSQL_CMD | tail -1 | cut -f 2)" -gt 0 ]; do
+ sleep 1
+ done
+ # for InnoDB, wait until every log is flushed
+ INNODB_STATUS=$(mktemp /tmp/mysql-flush.XXXXXX)
+ [ $? -ne 0 ] && exit 2
+ trap "rm -f $INNODB_STATUS" SIGINT
+ while :; do
+ printf "SHOW ENGINE INNODB STATUS \\G" | $MYSQL_CMD >
$INNODB_STATUS
+ LOG_CURRENT=$(grep 'Log sequence number' $INNODB_STATUS |\
+ tr -s ' ' | cut -d' ' -f4)
+ LOG_FLUSHED=$(grep 'Log flushed up to' $INNODB_STATUS |\
+ tr -s ' ' | cut -d' ' -f5)
+ [ "$LOG_CURRENT" = "$LOG_FLUSHED" ] && break
+ sleep 1
+ done
+ rm -f $INNODB_STATUS
+ ;;
+
+ thaw)
+ [ ! -p $FIFO ] && exit 1
+ echo > $FIFO
+ rm -f $FIFO
+ ;;
+
+ *)
+ exit 1
+ ;;
+esac
- [Qemu-devel] [PATCH v7 0/2] qemu-ga: add hook to quiesce the guest on fsfreeze-freeze/thaw, Tomoki Sekiyama, 2012/12/07
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks,
Tomoki Sekiyama <=
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Luiz Capitulino, 2012/12/07
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Eric Blake, 2012/12/07
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Luiz Capitulino, 2012/12/07
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Eric Blake, 2012/12/07
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Luiz Capitulino, 2012/12/07
- Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Tomoki Sekiyama, 2012/12/10
Re: [Qemu-devel] [PATCH v7 2/2] qemu-ga: sample fsfreeze hooks, Eric Blake, 2012/12/07