Home > LDOM, LDOM Cloning, solaris11 > How to clone LDOMs using ZFS

How to clone LDOMs using ZFS

The ZFS snapshot and cloning feature can be used to clones LDOMs. This comes very handy when you need to create multiple ldoms with some softwares already installed. The steps involved are :

1. Setup the primary domain
2. Create a guest LDOM (base LDOM)
3. Unconfigure, stop and unbind the base LDOM
4. Take zfs snapshot of base LDOM (called as golden image)
5. Clone the golden image to create new LDOMs

Setup the primary domain

Setup the primary domain with necessary resources and services and reboot the machine, for configuration changes to take effect.
Create default services

primary# ldm add-vcc port-range=5000-5100 primary-vcc0 primary
primary# ldm add-vds primary-vds0 primary
primary# ldm add-vsw net-dev=nxge0 primary-vsw0 primary
primary# ldm list-services primary 
VDS
    NAME             VOLUME         OPTIONS          DEVICE
    primary-vds0
VCC
    NAME             PORT-RANGE
    primary-vcc0     5000-5100
VSW
    NAME             MAC               NET-DEV   DEVICE     MODE
    primary-vsw0     02:04:4f:fb:9f:0d nxge0     switch@0   prog,promisc

Ensure ldmd deamon is online and set CPU, memory resources fro primary domain.

primary# svcs -a | grep ldmd
online 14:23:34 svc:/ldoms/ldmd:default
primary# ldm set-mau 1 primary
primary# ldm set-vcpu 8 primary
primary# ldm start-reconf primary          (delayed reconfiguration)
primary# ldm set-memory 4G primary
primary# ldm add-config new_config
primary# ldm list-config 
factory-default
new_config [current]

Reboot primary domain for new configuration (new_config) to become active.

primary# shutdown -y -g0 -i6

Enable networking between primary and guest domains

primary# ifconfig nxge0 down unplumb
primary# ifconfig vsw0 plumb
primary# ifconfig vsw0 192.168.1.2 netmask + broadcast + up
primary# mv /etc/hostname.nxge0 /etc/hostname.vsw0

Enable virtual network terminal server daemon if not already enabled.

primary# svcadm enable vntsd
primary# svcs vntsd
    STATE          STIME    FMRI
    online         Oct_12   svc:/ldoms/vntsd:default

Setting up the base LDOM

Setup the base LDOM (base_ldom) with 8 VCPU, 2GB Memory, virtual network device vnet1 and zfs volume (base_ldom) as a virtual disk (vdisk1).

primary# ldm add-domain base_ldom
primary# ldm add-vcpu 8 base_ldom
primary# ldm add-memory 2G base_ldom
primary# ldm add-vnet vnet1 primary-vsw0 base_ldom
primary# zfs create -V 5gb ldompool/base_ldomvol
primary# ldm add-vdsdev /dev/zvol/dsk/ldompool/base_ldomvol vol01@primary-vds0
primary# ldm add-vdisk vdisk1 vol01@primary-vds0 base_ldom

Set the boot environment variables

primary# ldm set-var auto-boot?=true base_ldom
primary# ldm set-var boot-device=vdisk1 base_ldom

Install Solaris 10 on base ldom using solaris 10 iso image. We will add solaris 10 iso image as a virtual disk and then boot the base LDOM from this disk to install solaris 10.

primary# ldm add-vdsdev options=ro /data/sol_10.iso iso@primary-vds0
primary# ldm add-vdisk sol10_iso iso@primary-vds0 base_ldom

Bind and start the base LDOM. The solaris 10 iso should reflect in the devalias output at OK prompt as sol10_iso. Boot from this image to start the installation.

primary# ldm bind base_ldom
primary# ldm start base_ldom
LDom base_ldom started
ok> devalias
sol10_iso                /virtual-devices@100/channel-devices@200/disk@1
vdisk0                   /virtual-devices@100/channel-devices@200/disk@0
vnet1                    /virtual-devices@100/channel-devices@200/network@0
net                      /virtual-devices@100/channel-devices@200/network@0
disk                     /virtual-devices@100/channel-devices@200/disk@0
virtual-console          /virtual-devices/console@1
name                     aliases
ok> boot sol10_iso

Unconfigure, stop and unbind base LDOM

Unconfigure the base LDOM which automatically halts it. We would then stop the LDOM and unbind it so that we can take a snapshot of the base LDOM boot disk volume (base_ldomvol).

base_ldom# sys-unconfigure  (the ldom halts after this)
primary-domain# ldm stop base_ldom
primary-domain# ldm unbind base_ldom

Create the golden image

To create the golden image take a snapshot of the base_ldomvol from the base ldom.

primary-domain# zfs snapshot ldompool/bas_ldomvol@golden

Clone the golden image to create new LDOM

Clone the base_ldomvol snapshot (golden image) and use it to create the new LDOM, ldom01 with 4 VCPU, 4G, 1 MAU

primary-domain# zfs clone ldompool/bas_ldomvol@golden ldompool/ldom01_bootvol
primary-domain# ldm create ldom01
primary-domain# ldm set-mau 1 ldom01
primary-domain# ldm set-vcpu 4 ldom01
primary-domain# ldm set-mem 4G ldom01
primary-domain# ldm add-vnet vnet1 primary-vsw0 ldom01
primary-domain# ldm add-vdsdev ldompool/ldom01_bootvol vol01@primary-vds0
primary-domain# ldm add-vdisk vdisk1 vol01@primary-vds0
primary-domain# ldm set-variable auto-boot?=false ldom01
primary-domain# ldm bind ldom01
primary-domain# ldm start ldom01

When you boot the new LDOM, you will have to configure it with hostname, IP, timezone etc settings as it is an unconfigured LDOM.

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