Adding memory to a virtual machine
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Use "virsh", either locally:
root@rocky$ virsh (COMMANDS HERE)
or remotely:
teague@spinaltap$ virsh --connect qemu:///rocky.cluster.uoft.bkslab.org/system (COMMANDS HERE)
We want to change the configuration for a running VM. Doing this requires dumping the current configuration to a text (XML) file, editing it, and pushing the changes to the hypervisor. I will show this with the local version for brevity.
virsh list # Show all VMs virsh dumpxml pan.slot-31.rack-1.donnelly.cluster.uoft.bkslab.org > ~/pan.xml.tmp # Extract pan (sgemaster) configuration for local modification vim ~/pan.xml.tmp These lines <memory unit='KiB'>4194304</memory> <currentMemory unit='KiB'>4194304</currentMemory> to this <memory unit='KiB'>16777216</memory> <currentMemory unit='KiB'>8388608</currentMemory>
This changes the currently used memory from 4GB to 8GB and raises the max memory that can be allocated w/o rebotting from 4GB to 16GB
virsh define ~/pan.xml.tmp # Upload the new configuration to the hypervisor (overwrites pan.slot-31....) virsh shutdown pan.slot-31.rack-1.donnelly.cluster.uoft.bkslab.org virsh start pan.slot-31.rack-1.donnelly.cluster.uoft.bkslab.org
To remove jobs:
qconf -as pan.slot-27.rack-1.pharmacy.cluster.uoft.bkslab.org # I forgot to make pan a submit node, needed for deleting qstat -u '*' | tail -n+3 | cut -f2 -d\ | xargs -L 250 qdel -f # -L 250 means send chunks of 250 job ids to qdel