Practical Ansible 2

Creating a Kubernetes namespace with Ansible

So far, we have learned how to show existing namespaces, but usually, Ansible is used in a declarative way to achieve a desired state. So, let's create a new playbook called k8s-ns.yaml with the following content:

---- hosts: localhost  tasks:    - name: Ensure the myns namespace exists      k8s:        api_version: v1        kind: Namespace        name: myns        state: present

Before running it, we can execute kubectl get ns so that we can ensure myns is not present. In my case, the output is as follows:

$ kubectl get nsNAME STATUS AGEdefault Active 69mkube-node-lease Active 69mkube-public Active 69mkube-system Active 69m

We can now run the playbook with the following command:

$ ansible-playbook k8s-ns.yaml

The output should resemble ...