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[Qemu-devel] Re: Starting QEMU by PHP/Apache
From: |
Bolle |
Subject: |
[Qemu-devel] Re: Starting QEMU by PHP/Apache |
Date: |
Wed, 14 Oct 2009 07:12:56 +0200 |
address@hidden
Re: Starting QEMU by PHP/Apache
Hello all
First, I forgot to say, that I use the QEMU stable version
11.0 on a Gentoo box. I did some more testings. The QEMU
instance is starting and sometimes the OS starts to load,
but then QEMU stucks and consumes 100% CPU.
I checked the startup it with strace. The start of QEMU
itself produces the same output in strace, regardless if
started by the PHP CLI or by mod_php from Apache.
I then attached strace to the QEMU process, and there is a
big difference.
When starting QEMU with the PHP script from the CLI (as
the same user as the web server), it works and I get
something like that:
...
select(12, [6 11], [], [], {4, 993369}) = ? ERESTARTNOHAND
(To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
write(7, "\0"..., 1) = 1
sigreturn() = ? (mask now [])
clock_gettime(CLOCK_MONOTONIC, {2818001, 146485529}) = 0
clock_gettime(CLOCK_MONOTONIC, {2818001, 146548886}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0, 0}}) =
0
timer_settime(0, 0, {it_interval={0, 0}, it_value={0,
250000}}, NULL) = 0
clock_gettime(CLOCK_MONOTONIC, {2818001, 146758750}) = 0
clock_gettime(CLOCK_MONOTONIC, {2818001, 146819115}) = 0
clock_gettime(CLOCK_MONOTONIC, {2818001, 146879549}) = 0
clock_gettime(CLOCK_MONOTONIC, {2818001, 146938839}) = 0
--- SIGALRM (Alarm clock) @ 0 (0) ---
write(7, "\0"..., 1) = 1
sigreturn() = ? (mask now [])
...
If QEMU has been started by the web server with the same
script and user, I get:
...
select(11, [5 10], [], [], {3, 767239}) = 0 (Timeout)
clock_gettime(CLOCK_MONOTONIC, {2817617, 818297714}) = 0
clock_gettime(CLOCK_MONOTONIC, {2817617, 818382772}) = 0
clock_gettime(CLOCK_MONOTONIC, {2817617, 818444894}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0, 0}}) =
0
timer_settime(0, 0, {it_interval={0, 0}, it_value={0,
250000}}, NULL) = 0
clock_gettime(CLOCK_MONOTONIC, {2817617, 818698197}) = 0
clock_gettime(CLOCK_MONOTONIC, {2817617, 818759263}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0,
67453}}) = 0
clock_gettime(CLOCK_MONOTONIC, {2817617, 818894002}) = 0
clock_gettime(CLOCK_MONOTONIC, {2817617, 818954673}) = 0
timer_gettime(0, {it_interval={0, 0}, it_value={0, 0}}) =
0
timer_settime(0, 0, {it_interval={0, 0}, it_value={0,
250000}}, NULL) = 0
...
There are no SIGALRM executed. What can be the reason for
that ?
Andreas
On Tue, 13 Oct 2009 13:26:25 +0200
"Bolle" <address@hidden> wrote:
Hello
Did anybody had success to start a QEMU instance by a
PHP script under the Apache web server ?
I allow the Apache user with the help of sudoers to
start the QEMU binary as root. I've hacked the
"qemu-socket.c" to set the access mode to allow
communication for the monitor socket (only add
"chmod(path, <needed file mode bits>)").
I'm able to successfully start the QEMU instance from a
PHP CLI script as the user under which Apache is running
like "sudo -u <Apache user> sudo <qemu + args>". But when
I run the same script by the web server, QEMU starts up
to the BIOS, telling me to press F12 for a start device.
The "info cpus" tells "CPU #0: pc=0x000f08b5 (halted)".
The full command executed by PHP is:
/usr/bin/sudo /usr/bin/qemu -L /usr/share/qemu -M isapc
-m 16 -hda </path/and/name/to/image> -net none -serial
none -parallel none -vnc :0,password -monitor
unix:</path/and/name/to/socket>,server,nowait -name "QEMU
TEST" -pidfile </path/and/name/to/pid> -chroot
</path/to/image> -runas <service user> > /dev/null &
Any idea about where to look for more information ?
Andreas