Execute virsh commands in virt-launcher pod¶
A powerful utility to check and troubleshoot the VM state is virsh and the utility is already installed in the compute container on the virt-launcher pod.
For example, it possible to run any QMP commands.
For a full list of QMP command, please refer to the QEMU documentation.
$ kubectl get po
NAME READY STATUS RESTARTS AGE
virt-launcher-vmi-ephemeral-xg98p 3/3 Running 0 44m
$ kubectl exec -ti virt-launcher-vmi-debug-tools-fk64q -- bash
bash-5.1$ virsh list
Id Name State
-----------------------------------------
1 default_vmi-debug-tools running
bash-5.1$ virsh qemu-monitor-command default_vmi-debug-tools query-status --pretty
{
"return": {
"status": "running",
"singlestep": false,
"running": true
},
"id": "libvirt-439"
}
$ virsh qemu-monitor-command default_vmi-debug-tools query-kvm --pretty
{
"return": {
"enabled": true,
"present": true
},
"id": "libvirt-438"
}
Another useful virsh command is the qemu-monitor-event. Once invoked, it observes and reports the QEMU events.
The following example shows the events generated for pausing and unpausing the guest.
$ kubectl get po
NAME READY STATUS RESTARTS AGE
virt-launcher-vmi-ephemeral-nqcld 3/3 Running 0 57m
$ kubectl exec -ti virt-launcher-vmi-ephemeral-nqcld -- virsh qemu-monitor-event --pretty --loop
Then, you can, for example, pause and then unpause the guest and check the triggered events:
$ virtctl pause vmi vmi-ephemeral
VMI vmi-ephemeral was scheduled to pause
$ virtctl unpause vmi vmi-ephemeral
VMI vmi-ephemeral was scheduled to unpause
From the monitored events: