66 lines
1.7 KiB
Bash
Executable File
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
|