Red Hat Summit12.5. Additional Para-virtualized Hardware Configuration
This section will explain how to add additional virtual network or storage to a guest operating system. For more details on configuring network and storage resources on Red Hat Enterprise Linux 5 Virtualization read the document available on Emerging Technologies, Red Hat.com
12.5.1. Virtualized Network Interfaces
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Perform the following steps to configure additional network devices for your guest.
Edit your guest configuration file in
/etc/xen/YourGuestName replacing YourGuestName with the name of your guest.
The original entry may look like the one below.
vif = [ "mac=00:16:3e:2e:c5:a9,bridge=xenbr0" ]
vif = [ "mac=00:16:3e:2e:c5:a9,bridge=xenbr0" ]
Add an additional entry to the “
vif=” section of the configuration file similar to the one seen below.
vif = [ "mac=00:16:3e:2e:c5:a9,bridge=xenbr0",
"mac=00:16:3e:2f:d5:a9,bridge=xenbr0" ]
vif = [ "mac=00:16:3e:2e:c5:a9,bridge=xenbr0",
"mac=00:16:3e:2f:d5:a9,bridge=xenbr0" ]
Make sure you generate a unique MAC address for the new interface. You can use the command below.
echo 'import virtinst.util ; print virtinst.util.randomMAC()' | python
# echo 'import virtinst.util ; print virtinst.util.randomMAC()' | python
After the guest has been rebooted perform the following step in the guest operating system. Verify the update has been added to your
/etc/modules.conf in Red Hat Enterprise Linux 3 or /etc/modprobe.conf in Red Hat Enterprise Linux 4 and Red Hat Enterprise Linux 5. Add a new alias for each new interface you added.
alias eth1 xen-vnif
alias eth1 xen-vnif
Now test that each new interface you added make sure it is available inside the guest.
ifconfig eth1
# ifconfig eth1
The command above should display the properties of eth1, repeat the command for eth2 if you added a third interface, and so on.
Now configure the new network interfaces with
redhat-config-network on Red Hat Enterprise Linux 3 or system-config-network on Red Hat Enterprise Linux 4 and Red Hat Enterprise Linux 5.
12.5.2. Virtual Storage Devices
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Perform the following steps to configure additional virtual storage devices for your guest.
Edit your guest configuration file in
/etc/xen/YourGuestName replacing YourGuestName with the name of your guest. The original entry may look like the one below.
disk = [ "file:/var/lib/libvirt/images/rhel5_64_fv.dsk,hda,w"]
disk = [ "file:/var/lib/libvirt/images/rhel5_64_fv.dsk,hda,w"]
Now, add an additional entry for your new physical device, LUN, partition or volume to the “
disk=” parameter in the configuration file. Storage entities which use the para-virtualized driver resemble the entry below. The “tap:aio” parameter instructs the hypervisor to use the para-virtualized driver.
disk = [ "file:/var/lib/libvirt/images/rhel5_64_fv.dsk,hda,w",
"tap:aio:/var/lib/libvirt/images/UserStorage1.dsk,xvda,w" ]
disk = [ "file:/var/lib/libvirt/images/rhel5_64_fv.dsk,hda,w",
"tap:aio:/var/lib/libvirt/images/UserStorage1.dsk,xvda,w" ]
If you want to add more entries just add them to the “
disk=” section as a comma separated list.
Note
You need to increment the letter for the '
xvd' device, that is for your second storage entity it would be 'xvdb' instead of 'xvda'.
disk = [ "file:/var/lib/libvirt/images/rhel5_64_fv.dsk,hda,w",
"tap:aio:/var/lib/libvirt/images/UserStorage1.dsk,xvda,w",
"tap:aio:/var/lib/libvirt/images/UserStorage2.dsk,xvdb,w" ]
disk = [ "file:/var/lib/libvirt/images/rhel5_64_fv.dsk,hda,w",
"tap:aio:/var/lib/libvirt/images/UserStorage1.dsk,xvda,w",
"tap:aio:/var/lib/libvirt/images/UserStorage2.dsk,xvdb,w" ]
Verify the partitions have been created and are available.
In the above output you can see the partition or device “
xvdb” is available to the system.
Mount the new devices and disks to local mount points and update the
/etc/fstab inside the guest to mount the devices and partitions at boot time.
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