Solving vagrant up's name of domain about to create is already taken

Creating and destroying virtual machines in Vagrant left and right might get us in trouble. If we reuse the domain name, Vagrant will fail to create it again. Here is how to use virsh if Vagrant won’t help anymore.

This is how the error look like:

$ vagrant up
Bringing machine default up with libvirt provider…
==> default: Checking if box fedora/30-cloud-base version30.20190425.0 is up to date…
Name `backend_default` of domain about to create is already taken. Please try to run
`vagrant up` command again.

The domain (a virtual machine in virtualization slang) is taken. Sometimes this happens because we already have a default project in the directory of the same name. But other times, it’s not as simple, and Vagrant won’t cooperate.

If vagrant destroy doesn’t help, we can use virsh to tackle the problem.

First, we can try virth destroy, which immediate ungraceful shutdown:

$ virsh destroy backend_default
error: Failed to destroy domain backend_default
error: Requested operation is not valid: domain is not running

But in my case, the domain was not running, so virsh destroy would not work.

Second option is to use virsh undefine, which removes the configuration:

$ virsh undefine backend_default

Removing the configuration altogether did the trick for me. Vagrant wouldn’t see a domain of this name anymore and successfully create the new one.

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