Virtualization in Grid'5000: Difference between revisions
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(→Or, you can start the guest OS using libvirt: Specify the image format (qcow2)) |
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<devices> | <devices> | ||
<emulator>/usr/bin/kvm</emulator> | <emulator>/usr/bin/kvm</emulator> | ||
<driver name='qemu' type='qcow2'/> | |||
<disk type='file' device='disk'> | <disk type='file' device='disk'> | ||
<source file='/tmp/squeeze-x64-base.qcow2'/> | <source file='/tmp/squeeze-x64-base.qcow2'/> | ||
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<console type='pty' tty='/dev/ttyS0'> | <console type='pty' tty='/dev/ttyS0'> | ||
<source path='/dev/ttyS0'/> | <source path='/dev/ttyS0'/> | ||
<target port='0'/> | |||
</console> | </console> | ||
</devices> | </devices> |
Revision as of 15:09, 21 December 2011
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`
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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=$MACADDR
-net tap,ifname=tap0
,script=no -nographic
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Note |
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Replace |
Or, you can start the guest OS using libvirt
- Edit the domain file
eg : domain.xml
<domain type='kvm'> <name>squeeze</name> <memory>524288</memory> <vcpu>1</vcpu> <os> <type arch="x86_64">hvm</type> </os> <clock sync="localtime"/> <devices> <emulator>/usr/bin/kvm</emulator> <driver name='qemu' type='qcow2'/> <disk type='file' device='disk'>
<target dev='hda'/> </disk> <interface type='ethernet'> <target dev='tap0'/> <script path='no'/> <mac address='00:16:3e:fc:66:09'/> </interface> <serial type='pty'>
<target port='0'/> </serial> <console type='pty' tty='/dev/ttyS0'>
<target port='0'/> </console> </devices> </domain>
- Now, the guest OS can be started.
jdoe@griffon-37:~$ virsh create domain.xml
- You can use
virsh
to manage your guest OS.
jdoe@griffon-37:~$ virsh list
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
- Some clusters don't have virtualization support in the BIOS. To check :
jdoe@griffon-37:~$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo