Virtualization in Grid'5000
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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)
Note | |
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Create one Tun/Tap interface per guest OS. |
Generate a random mac address for the Tun/Tap interface
- Use the following script
jdoe@griffon-37:~$ 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=$MACADDR
-net tap,ifname=tap0
,script=no -nographic
Note | |
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Replace |
Or, you can start the guest OS using libvirt
- Edit the domain file
eg : domain.xml
<domain type='kvm'> <name>squeeze-vm1</name> <memory>524288</memory> <vcpu>1</vcpu> <os> <type arch="x86_64">hvm</type> </os> <clock sync="localtime"/> <devices> <disk type='file' device='disk'>
<target dev='hda'/> </disk> <interface type='ethernet'> <target dev='tap0'/> <script path='no'/> <mac address='00:16:3e:82:a6:ea'/> </interface> <graphics type='vnc' port='5900'/> </devices> </domain>
- Now, the guest OS can be started.
jdoe@griffon-37:~$ virsh create domain.xml
- You can use
virsh
to manage your guest OS.
jdoe@griffon-37:~$ virsh list
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
- Use
tunctl
if you need to delete a Tun/Tap device.
jdoe@griffon-37:~$ /usr/sbin/tunctl -d tap0