Crash recovery for zones

Question

hi,
What's the best way for crash recovery for zones?
Thanks,
Rosario

Answer 1

there are some recipes using the snapshot feature of ZFS systems. I tried a solution for non ZFS filesystems:
to backup:
df -F nfs | sed "s/ .*//" > /tmp/excludes # this excludes NFS mounted filesystems
find /$zonepath/$zonename -fstype lofs -prune 2> /dev/null | sed "s/^\/$zonepath\///">> /tmp/excludes # this exclude LOFS mounted filesystems
echo "$zonename/root/proc" >> /tmp/excludes
echo "$zonename/root/var/run" >> /tmp/excludes
echo "$zonename/root/system/contract/all" >> /tmp/excludes
echo "$zonename/root/system/contract/process" >> /tmp/excludes
echo "$zonename/root/etc/mnttab" >> /tmp/excludes
echo "$zonename/root/etc/svc/volatile" >> /tmp/excludes
echo "$zonename/root/system/object" >> /tmp/excludes
echo "$zonename/root/tmp" >> /tmp/excludes
echo "$zonename/root/var/svc/log" >> /tmp/excludes
echo "$zonename/root/var/log/syslog*" >> /tmp/excludes
echo "$zonename/root/var/saf/zsmon/log" >> /tmp/excludes
echo "$zonename/root/var/adm/messages*" >> /tmp/excludes
echo "$zonename/root/var/adm/wtmpx" >> /tmp/excludes
echo "$zonename/root/etc/svc/volatile/repository_door" >> /tmp/excludes
echo "$zonename/root/tmp/.X11-unix/X0" >> /tmp/excludes
echo "$zonename/dev/.devfsadm_synch_door" >> /tmp/excludes
cd /$zonepath
tar -EcfX /$somepath/$zonename.tar /tmp/excludes $zonename 2> /tmp/$zonename.err
to restore:
extract tar
mkdir of all mount points
mkdir for all dynamic data (i.e. $zonename/root/proc), assigning correct permissions&ownership
create files for all dynamic data (i.e. $zonename/root/etc/mnttab), assigning correct permissions&ownership
this solution requires that the backed up machine, and the restored one, to have the same OS level and patches