Ansible Role: Kubernetes

Role to install the Kubernetes container cluster manager.

Requirements

• Ansible >= 2.9

• Linux Distribution

  • Debian Family

    • Ubuntu

      • Bionic (18.04)
      • Focal (20.04)

Role Variables

The following variables will change the behavior of this role (default values are shown below):

# Node type: determines what features are installed.
# - controller:
#     - kubectl
# - worker:
#     - kubelet
#     - kubernetes-cni
# - master:
#     - kubelet
#     - kubectl
#     - kubernetes-cni
# - admin:
#     - kubelet
#     - kubectl
#     - kubeadm
#     - kubernetes-cni
kubernetes_node_type: worker

# The ID of the APT key for the Kubernetes repository (optional)
kubernetes_apt_key_id:

Example Playbook

- hosts: servers
  roles:
    - role: gantsign.kubernetes
      kubernetes_node_type: worker

Tab Completion & Aliases for Zsh

Using Ansible

We recommended using the gantsign.antigen role to enable Zsh support for Kubernetes (this must be configured for each user).

- hosts: servers
  roles:
    - role: gantsign.kubernetes
      kubernetes_node_type: worker

    - role: gantsign.antigen
      users:
        - username: example
          antigen_libraries:
            - name: oh-my-zsh
          antigen_bundles:
            # Use the Oh My Zsh plugin for kubectl
            - name: kubectl
            # Use the GantSign plugin for kubeadm
            - name: kubeadm
              url: gantsign/zsh-plugins
              location: kubeadm

Using Antigen

If you prefer to use Antigen directly add the following to your Antigen configuration:

antigen use oh-my-zsh
antigen bundle kubectl
antigen bundle gantsign/zsh-plugins kubeadm

Important: there's a bug with the current version of Antigen that prevents it working with the kubectl plugin. We recommend using version 2.0.2 of Antigen until the issue is fixed.

Manual configuration

To manually configure Zsh tab completion add the following to your .zshrc:

eval "$(kubectl completion zsh)"
eval "$(kubeadm completion zsh)"

More Roles From GantSign

You can find more roles from GantSign on Ansible Galaxy.

Development & Testing

This project uses Molecule to aid in the development and testing; the role is unit tested using Testinfra and pytest.

To develop or test you'll need to have installed the following:

• Linux (e.g. Ubuntu)
• Docker
• Python (including python-pip)
• Ansible
• Molecule

Because the above can be tricky to install, this project includes Molecule Wrapper. Molecule Wrapper is a shell script that installs Molecule and it's dependencies (apart from Linux) and then executes Molecule with the command you pass it.

To test this role using Molecule Wrapper run the following command from the project root:

./moleculew test

Note: some of the dependencies need sudo permission to install.

License

MIT

Author Information

John Freeman

GantSign Ltd. Company No. 06109112 (registered in England)