Sun Microsystems SOLARIS 10 - Manual (Page 108)

Version 3.1-en Solaris 10 Container Guide - 3.1 5. Cookbooks Effective: 30/11/2009
5.3.8. Duplicating zones with zoneadm detach/attach and zfs clone
[ug] First, the zone "test" is moved to its own ZFS file system. The file system must only be available
from root otherwise an error message will appear.
global# zfs create container/ztest
global# ls -ld /container/ztest
drwxr-xr-x 2 root root 2 Feb 19 16:00 /container/ztest
global# chmod og-rwx /container/ztest
global# ls -ld /container/ztest
drwx------ 2 root root 2 Feb 19 16:00 /container/ztest
Next, the zone is moved to the separate ZFS file system. The configuration is adjusted automatically;
to do so, it must of course be shut down.
global# zoneadm -z test move /container/ztest
Moving across file-systems; copying zonepath /container/test...
Cleaning up zonepath /container/test...
The zone is detached, and the current status of the file system is recorded with zfs snapshot as a
read-only version (the gold standard). The original zone can then be activated again.
global# zoneadm -z test detach
global# zfs snapshot container/ztest@gold
global# zoneadm -z test attach
global# zoneadm -z test boot
A copy of the zone is created by generating a writable version of the zone file system with zfs
clone.
global# zfs clone container/ztest@gold container/ztest2
global# zfs list
NAME USED AVAIL REFER MOUNTPOINT
container 181M 803M 88.7M /container
container/ztest 91.8M 803M 88.7M /container/ztest
container/ztest@gold 3.07M - 90.4M -
container/ztest2 0 803M 90.4M /container/ztest2
In order to activate the zone copy, it must be configured, and the zone path must be adjusted.
Subsequently, it is sufficient to use zoneadm attach and the zone can be started up.
global# zonecfg -z test export | zonecfg -z test2
test2: No such zone configured
Use 'create' to begin configuring a new zone.
global# zonecfg -z test2 set zonepath=/container/ztest2
global# zoneadm -z test2 attach
global# zoneadm -z test2 boot
In the zone, the name of the OS instance is still the same of course since the file /etc/nodename
has not yet been changed. Furthermore, it makes sense to adapt the network addresses as well, just
like the zonepath adaptation performed here.
Additional zones with the same OS content can now be created very quick by repeating the steps
zfs clone / zonecfg / zoneadm attach.
In the same way, zones can also be moved to other systems with zoneadm detach /
attach. A prerequisite is that the same package and patch status is present on the target system.
By using the option zoneadm attach -u, a zone can be moved to a system with a newer
status, however, downgrading of patches must not occur.
Since Solaris 10 5/09, zfs clone is used automatically with the command
zoneadm -z zone clone if the zone is located on a ZFS file system. This facilitates the quick
creation of zones even more.
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