Fix issues with vagrant-dns

If after updating Vagrant, you get errors regarding vagrant-dns when provisioning the VM you will need to reinstall the vagrant-dns plugin:

vagrant plugin uninstall vagrant-dns
vagrant plugin install vagrant-dns

You may see an error like:

/opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/dependency.rb:315:in `to_specs': Could not find 'celluloid' (>= 0.16.0) among 45 total gem(s) (Gem::LoadError)

This is a problem with Vagrant 1.9.0. Upgrading to Vagrant 1.9.1 or newer should fix the issue.

You may also need to make sure the plugin has been started:

vagrant dns --start

If you’re having issues with your host machine resolving hosts, try purging and reinstalling the DNS config:

vagrant dns --purge
vagrant dns --install
vagrant dns --start

In order to check if the plugin started correctly, you can run:

ps aux | grep vagrant-dns
vagrant dns --start -o

If this gives an error about an “undefined method socket_type”, then you have hit a bug in async-dns, a dependency of vagrant-dns. The solution is to install an older version of vagrant-dns:

vagrant plugin uninstall vagrant-dns
vagrant plugin install vagrant-dns --plugin-version 1.1.0

If you’re still having issues you can try to update the vagrant-dns plugin:

vagrant plugin update vagrant-dns