Adding memory to a virtual machine

Use "virsh", either locally:

root@your_hypervisor$ virsh (COMMANDS HERE)

or remotely:

root@foreman_machine$ virsh --connect qemu:///your_hypervisor/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 your_vm > ~/your_vm.xml.tmp  # Extract pan configuration for local modification
vim ~/your_vm.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 ~/your_vm.xml.tmp  # Upload the new configuration to the hypervisor (overwrites pan.slot-31....)
virsh shutdown your_vm
virsh start your_vm

To remove jobs:

qconf -as your_vm 
qstat -u '*' | tail -n+3 | cut -f2 -d\ | xargs -L 250 qdel -f   # -L 250 means send chunks of 250 job ids to qdel