A systems administrator is managing a KVM hypervisor and needs to dynamically increase the memory available to a running virtual machine named 'db-server-01'. The VM is currently running with 2GB of RAM but is configured to support a maximum of 8GB. Which of the following commands will successfully allocate a total of 4GB of RAM to the running VM without requiring a restart?
The correct command is virsh setmem db-server-01 4G --live. The virsh setmem command is used to change a virtual machine's current memory allocation. The --live flag is crucial as it applies the change to the running instance of the virtual machine. The new memory size cannot exceed the maximum memory configured for the VM. The virsh edit command modifies the persistent XML configuration, but changes do not take effect until the VM is restarted. The virsh setmaxmem command is used to alter the maximum possible memory a VM can have, which also typically requires a restart to apply. virsh memtune is used for setting memory performance tuning parameters, not for changing the primary memory allocation.
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What does the '--live' flag do when using the virsh setmem command?
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How does 'virsh setmaxmem' differ from 'virsh setmem'?
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Why does `virsh edit` not work for changing memory dynamically?
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CompTIA Linux+ XK0-006 (V8)
System Management
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