Undefined variable 'kubernetes_join_command'

[tperelle]

I had an issue when executing vagrant up, in the ansible playbook execution :

TASK [kubernetes/cluster : KUBERNETES | Set kubeadm join command globally] *****
fatal: [kubernetes02]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'kubernetes_join_command'\n\nThe error appears to have been in '/Users/thomas/Dev/Tests/ansible_kubernetes/roles/kubernetes/cluster/tasks/main.yml': line 42, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: KUBERNETES | Set kubeadm join command globally\n ^ here\n"}
fatal: [kubernetes03]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'kubernetes_join_command'\n\nThe error appears to have been in '/Users/thomas/Dev/Tests/ansible_kubernetes/roles/kubernetes/cluster/tasks/main.yml': line 42, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: KUBERNETES | Set kubeadm join command globally\n ^ here\n"}

PLAY RECAP *********************************************************************
kubernetes01 : ok=24 changed=14 unreachable=0 failed=1
kubernetes02 : ok=24 changed=14 unreachable=0 failed=1
kubernetes03 : ok=24 changed=14 unreachable=0 failed=1

Ansible failed to complete successfully. Any error output should be
visible above. Please fix these errors and try again.

Material & Versions :

• Macbook pro / macOS Mojave 10.14.5
• Ansible 2.7.1
• Python 3.7.2
• Vagrant 2.2.4