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Virtualization Guide
22.2. Share storage example: NFS for a simple migration

22.2. Share storage example: NFS for a simple migration

This example uses NFS to share guest images with other KVM hosts. This example is not practical for large installations, this example is only for demonstrating migration techniques and small deployments. Do not use this example for migrating or running more than a few guests.

For advanced and more robust shared storage instructions, see Part V, “Virtualization Storage Topics”

Export your libvirt image directory
Add the default image directory to the /etc/exports file:
```
/var/lib/libvirt/images *.example.com(rw,no_root_squash,async)
```
```
/var/lib/libvirt/images *.example.com(rw,no_root_squash,async)
```
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Change the hosts parameter as required for your environment.
Start NFS
1. Install the NFS packages if they are not yet installed:
```
yum install nfs
```
```
# yum install nfs
```
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2. Open the ports for NFS in iptables and add NFS to the /etc/hosts.allow file.
3. Start the NFS service:
```
service nfs start
```
```
# service nfs start
```
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Mount the shared storage on the destination
On the destination system, mount the /var/lib/libvirt/images directory:
```
mount sourceURL:/var/lib/libvirt/images /var/lib/libvirt/images
```
```
# mount sourceURL:/var/lib/libvirt/images /var/lib/libvirt/images
```
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Warning
Whichever directory is chosen for the guests must exactly the same on host and guest. This applies to all types of shared storage. The directory must be the same or the migration will fail.

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22.2. Share storage example: NFS for a simple migration

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