Virtualization in Grid'5000: Difference between revisions
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* For the deployment of an important number of guest OS, you can use the [[Subnet_reservation | subnet reservation]]. See also the [[Virtual_network_interlink | virtual network interlink]]. | * For the deployment of an important number of guest OS, you can use the [[Subnet_reservation | subnet reservation]]. See also the [[Virtual_network_interlink | virtual network interlink]]. | ||
* Manage the console for all your guest OS with [[Screen]] | * Manage the console for all your guest OS with [[Screen]] | ||
* Accounts: root:grid5000 | |||
* Use <code class="command">tunctl</code> if you need to delete a Tun/Tap device. | * Use <code class="command">tunctl</code> if you need to delete a Tun/Tap device. | ||
jdoe@griffon-37:~$ /usr/sbin/tunctl -d tap0 | jdoe@griffon-37:~$ /usr/sbin/tunctl -d tap0 | ||
* Some clusters don't have virtualization support in the BIOS. To check : | * Some clusters don't have virtualization support in the BIOS. To check : | ||
jdoe@griffon-37:~$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo | jdoe@griffon-37:~$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo |
Revision as of 19:11, 11 January 2012
See also: KVM | KVM_on_production_environment
Purpose
This page presents ways to use KVM on production image.
Usage
First, submit the job using habitual oarsub command
jdoe@fnancy:~$ oarsub -I
Copy the kvm disk image to /tmp on the node
jdoe@griffon-37:~$ cp /grid5000/images/KVM/squeeze-x64-base.qcow2 /tmp/
Create Tun/Tap interface for your guest OS
jdoe@griffon-37:~$ sudo create_tap
- Tun/Tap interfaces are listed by issuing the command
/sbin/ifconfig
.
jdoe@griffon-37:~$ /sbin/ifconfig
[...] tap0 Link encap:Ethernet HWaddr 00:16:3e:db:c6:41 inet6 addr: fe80::58ff:a4ff:fe97:c6a8/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:29435 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Generate a random mac address for the Tun/Tap interface
- Use the following script
jdoe@griffon-37:~$ export MACADDR=`random_mac`
Note | |
---|---|
The first three octets are important (identification for the virtualized network). Don't change it. |
Now, you can run the guest OS using kvm
jdoe@griffon-37:~$ screen kvm -m 512 -hda /tmp/squeeze-x64-base.qcow2 -net nic,macaddr=$MACADDR
-net tap,ifname=tap0
,script=no -nographic
Note | |
---|---|
In this example, |
Or, you can start the guest OS using libvirt
- Edit the domain file
eg : domain.xml
<domain type='kvm'> <name>squeeze</name> <memory>524288</memory> <vcpu>1</vcpu> <os> <type arch="x86_64">hvm</type> </os> <clock sync="localtime"/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <driver type='qcow2'/>
<target dev='vda' bus='virtio'/> </disk> <interface type='ethernet'> <target dev='tap0'/> <script path='no'/> <mac address='00:16:3e:78:b8:04'/> </interface> <serial type='pty'>
<target port='0'/> </serial> <console type='pty'>
<target port='0'/> </console> </devices> </domain>
- Now, the guest OS can be started.
jdoe@griffon-37:~$ virsh create domain.xml
- You can use
virsh
to manage your guest OS.
jdoe@griffon-37:~$ virsh list jdoe@griffon-37:~$ virsh console squeeze
Misc notes
- For the deployment of an important number of guest OS, you can use the subnet reservation. See also the virtual network interlink.
- Manage the console for all your guest OS with Screen
- Accounts: root:grid5000
- Use
tunctl
if you need to delete a Tun/Tap device.
jdoe@griffon-37:~$ /usr/sbin/tunctl -d tap0
- Some clusters don't have virtualization support in the BIOS. To check :
jdoe@griffon-37:~$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo