multi-node - The machine with the name 'e2' was not found configured for this Vagrant environment

[Giovanni Tirloni]

Steps to reproduce:

git clone --depth=1 https://github.com/coreos/coreos-kubernetes
cd coreos-kubernetes/multi-node
cp config.rb.sample config.rb
vi config.rb # uncomment all lines
vagrant up

Error:

$ vagrant up
Generating RSA private key, 2048 bit long modulus
......................................................................+++
............................................+++
e is 65537 (0x010001)
Generating SSL artifacts in ssl
Generating RSA private key, 2048 bit long modulus
............................................................+++
.........................................+++
e is 65537 (0x010001)
Signature ok
subject=CN = kube-admin
Getting CA Private Key
Bundled SSL artifacts into ssl/kube-admin.tar
ssl/ca.pem ssl/admin-key.pem ssl/admin.pem
coreos-kubernetes/multi-node/vagrant/Vagrantfile:19: warning: already initialized constant CONFIG
coreos-kubernetes/multi-node/vagrant/Vagrantfile:19: warning: previous definition of CONFIG was here
coreos-kubernetes/multi-node/vagrant/Vagrantfile:28: warning: already initialized constant CONTROLLER_CLUSTER_IP
coreos-kubernetes/multi-node/vagrant/Vagrantfile:28: warning: previous definition of CONTROLLER_CLUSTER_IP was here
coreos-kubernetes/multi-node/vagrant/Vagrantfile:30: warning: already initialized constant ETCD_CLOUD_CONFIG_PATH
coreos-kubernetes/multi-node/vagrant/Vagrantfile:30: warning: previous definition of ETCD_CLOUD_CONFIG_PATH was here
coreos-kubernetes/multi-node/vagrant/Vagrantfile:32: warning: already initialized constant CONTROLLER_CLOUD_CONFIG_PATH
coreos-kubernetes/multi-node/vagrant/Vagrantfile:32: warning: previous definition of CONTROLLER_CLOUD_CONFIG_PATH was here
coreos-kubernetes/multi-node/vagrant/Vagrantfile:33: warning: already initialized constant WORKER_CLOUD_CONFIG_PATH
coreos-kubernetes/multi-node/vagrant/Vagrantfile:33: warning: previous definition of WORKER_CLOUD_CONFIG_PATH was here
The machine with the name 'e2' was not found configured for
this Vagrant environment.

Environment:

git 7d7f98e038fd1b28845663e938d03242a161543f
vagrant 1.9.7
VirtualBox 5.1.22
Fedora 26