The MDC VM won't start because of internal network issues

This specific issue can be confirmed from with virt-manager by checking the "Details" (from right-click menu) of the QEMU/KVM hypervisor, navigating to the "Virtual Networks" tab, and attempting to start the the internal1 network, which will give the error:

Error starting network 'internal1': error creating bridge interface virbr0: File exists

As the last few words suggest, this issue is caused by the internal1 interface starting to bring up its slave interface virbr0, but the interface already being up. To resolve it, simply delete these existing interfaces.

ip link delete virbr0ip link delete virbr1

After this, the internal networks can be started, followed by the dependent VM(s).

Matthew Jensen
2019-08-01 13:57