Basic Troubleshoot

Updated 2,569 Days AgoPublic

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Waking up a VM

When the monitor of the VM is off, you can ssh to the host machine to see if the host machine is not turn off accidentally.

If the host machine is on(which means that you can ssh to it), you can check the status of the corresponding VM by :

Use systemctl status hmux@ecc-a-(machine number) to check the status of the vms.
Use uptime to check how long the machine have been running.

# systemctl status hmux@ecc-(Lab)-(Machine Number)
$ systemctl status hmux@ecc-a-09

To wake up the vm

# socat - UNIX-CONNECT:/var/run/qemu/ecc-(Lab)-(Machine Number)/monitor
$ socat - UNIX-CONNECT:/var/run/qemu/ecc-a-09/monitor

VM is not responding

To gently shutdown the vm, first login to the host machine and connect to the monitor file as root

$ socat - UNIX-CONNECT:/var/run/qemu/ecc-a-${COMP_NUMBER}/monitor

Qemu Host not responding to start command

If the virtual machinese are not responding after the the host restated, use the unbind script with the following command with root.

$ /var/qemu/unbind.sh

Once connected to the monitor, type quit and the machine should attempt to shutdown gracefully.

If the machine is still not responding, a more forceful command will be required. First, find the process id of the rogue VM

$ ps aux | grep qemu

This will output the processes being run with qemu, one of which should be the machine that is causing issues. Once the correct pid is found, kill the process by typing

$ sudo kill ${pid}

Create a new Virtual Machine

1. ssh to the host machine
2. get root access by entering $ sudo su
3. $ cd /var/tmp
4. $ ls to make sure win10.iso and virtio.iso are within the directory
5. Remove the old volume

# lvremove (volume group)/(Vm name)
$ lvremove vg0/ecc-a-17

6. Create a new blank volume:

# lvcreate (Size) -n (Vm name ) (volume group)
$ lvcreate -L300G -n ecc-a-17 vg0