nova/tools/xenserver/rotate_xen_guest_logs.sh
Mate Lakat f3af80fea6 xenapi: Fix console rotate script
First time run of the console rotate script failed, due to the fact that
the logs did not exist at that time.

Fixes bug 1204440

Change-Id: I49b5569c1ba3349d911caace42685fa0f19a1f66
2013-07-24 10:43:35 +01:00

66 lines
1.7 KiB
Bash
Executable File

#!/bin/bash
set -eux
# Script to rotate console logs
#
# Should be run on Dom0, with cron, every minute:
# * * * * * /root/rotate_xen_guest_logs.sh
#
# Should clear out the guest logs on every boot
# because the domain ids may get re-used for a
# different tenant after the reboot
#
# /var/log/xen/guest should be mounted into a
# small loopback device to stop any guest being
# able to fill dom0 file system
log_dir="/var/log/xen/guest"
kb=1024
max_size_bytes=$(($kb*$kb))
truncated_size_bytes=$((5*$kb))
list_domains=/opt/xensource/bin/list_domains
log_file_base="${log_dir}/console."
tmp_file_base="${log_dir}/tmp.console."
# Ensure logging is setup correctly for all domains
xenstore-write /local/logconsole/@ "${log_file_base}%d"
# Move logs we want to keep
domains=$($list_domains | sed '/^id*/d' | sed 's/|.*|.*$//g' | xargs)
for i in $domains; do
log="${log_file_base}$i"
tmp="${tmp_file_base}$i"
mv $log $tmp || true
done
# Delete all console logs,
# mostly to remove logs from recently killed domains
rm -f ${log_dir}/console.*
# Reload domain list, in case it changed
# (note we may have just deleted a new console log)
domains=$($list_domains | sed '/^id*/d' | sed 's/|.*|.*$//g' | xargs)
for i in $domains; do
log="${log_file_base}$i"
tmp="${tmp_file_base}$i"
if [ -e "$tmp" ]; then
size=$(stat -c%s "$tmp")
# Trim the log if required
if [ "$size" -gt "$max_size_bytes" ]; then
tail -c $truncated_size_bytes $tmp > $log || true
else
mv $tmp $log || true
fi
fi
# Notify xen that it needs to reload the file
xenstore-write /local/logconsole/$i $log
xenstore-rm /local/logconsole/$i
done
# Delete all the tmp files
rm -f ${tmp_file_base}* || true