Package: libvirt
Version: 0.4.4-3
Severity: normal
The log files in /var/log/libvirt/qemu/ may become quite large, especially
with collectd's libvirt plugin (collects and logs drive statistics every 10
seconds). munin-libvirt-plugins has a similar effect, only that the volume
is smaller (every 5 minutes).
I use the following quick hack to make the logs rotateable (with logrotate's
copytruncate option):
diff -ur libvirt-0.4.4.orig/src/qemu_driver.c libvirt-0.4.4/src/qemu_driver.c
--- libvirt-0.4.4.orig/src/qemu_driver.c 2008-06-12
16:52:53.000000000 +0200
+++ libvirt-0.4.4/src/qemu_driver.c 2008-12-02 12:48:32.271881000 +0100
@@ -844,7 +844,7 @@
return -1;
}
- if ((vm->logfile = open(logfile, O_CREAT | O_TRUNC | O_WRONLY,
+ if ((vm->logfile = open(logfile, O_CREAT | O_APPEND | O_WRONLY,
S_IRUSR | S_IWUSR)) < 0) {
qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to create logfile %s: %s"),
So the log file is opened with O_APPEND (to make logrotate work with
copytruncate) and without O_TRUNC (to not lose log information e.g. with
stop and start of a VM).
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