Categories
FreeBSD iocage

Migrate a thick jail to another host

Migrating a jail

Thick iocage jails can be safely migrated between FreeBSD hosts using ZFS Send/Recv over SSH.

In the following example:

  • src$ is the original host
  • dst$ is the destination host
  • ‘myapp’ is the name of my jail to migrate
  • Everything is done with root privileges

Stopping processes

Stop the jail and any other ZFS replication processes.

vince@src$

iocage stop myapp

service zrepl stop

vince@dst$

service zrepl stop

Create a snapshot

vince@src$

zfs snapshot -r zroot/iocage/jails/myapp@migration

Send the snapshot

vince@src$

zfs send -R zroot/iocage/jails/myapp@migration | \
ssh root@dst 'zfs recv -F -v zroot/iocage/jails/myapp'

Testing

Check that the jail exists and that it can be started.

vince@dst$

iocage list

iocage start myapp

service zrepl start