Unverified Commit 9998f503 authored by Derek Nola's avatar Derek Nola Committed by GitHub
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Support user defined kubeconfig, fix merging context (#266) 



* Support user defined kubeconfig, fix merging context

Signed-off-by: default avatarDerek Nola <derek.nola@suse.com>
parent 4d6e6028

README.md

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@@ -94,13 +94,16 @@ It is assumed that the control node has access to the internet. The playbook wil 


## Kubeconfig



After successful bringup, the kubeconfig of the cluster is copied to the control node  and set as default (`~/.kube/config`).

Assuming you have [kubectl](https://kubernetes.io/docs/tasks/tools/#kubectl) installed, you to confirm access to your **Kubernetes** cluster use the following:

After successful bringup, the kubeconfig of the cluster is copied to the control node  and merged with `~/.kube/config` under the `k3s-ansible` context.

Assuming you have [kubectl](https://kubernetes.io/docs/tasks/tools/#kubectl) installed, you can confirm access to your **Kubernetes** cluster with the following:



```bash

kubectl config use-context k3s-ansible

kubectl get nodes

```



If you wish for your kubeconfig to be copied elsewhere and not merged, you can set the `kubeconfig` variable in `inventory.yml` to the desired path.



## Local Testing



A Vagrantfile is provided that provision a 5 nodes cluster using Vagrant (LibVirt or Virtualbox as provider). To use it:

roles/k3s_server/defaults/main.yml

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@@ -2,3 +2,4 @@ 
k3s_server_location: "/var/lib/rancher/k3s"

systemd_dir: "/etc/systemd/system"

api_port: 6443

kubeconfig: ~/.kube/config.new

roles/k3s_server/tasks/main.yml

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    - name: Copy kubectl config to local machine

      ansible.builtin.fetch:

        src: ~{{ ansible_user }}/.kube/config

        dest: ~/.kube/config.new

        dest: "{{ kubeconfig }}"

        flat: true



    - name: Check whether kubectl is installed on control node

      ansible.builtin.command: 'kubectl'

      register: kubectl_installed

      ignore_errors: yes

      delegate_to: 127.0.0.1

      become: false

      changed_when: false



    - name: Setup kubeconfig k3s-ansible context

      when: kubeconfig == "~/.kube/config.new" && kubectl_installed.rc == 0

      ansible.builtin.replace:

        path: "{{ kubeconfig }}"

        regexp: 'name: default'

        replace: 'name: k3s-ansible'

      delegate_to: 127.0.0.1

      become: false



    - name: Merge with any existing kube config

      when: kubeconfig == "~/.kube/config.new" && kubectl_installed.rc == 0

      ansible.builtin.shell: |

        TFILE=$(mktemp)

        KUBECONFIG=~/.kube/config:~/.kube/config.new kubectl config view --flatten > ${TFILE}

        KUBECONFIG=~/.kube/config.new kubectl rename-context default k3s-ansible

        KUBECONFIG=~/.kube/config.new kubectl config set-context k3s-ansible --user=k3s-ansible --cluster=k3s-ansible

        KUBECONFIG=~/.kube/config.new:~/.kube/config kubectl config view --flatten > ${TFILE}

        mv ${TFILE} ~/.kube/config

        rm ~/.kube/config.new

      delegate_to: 127.0.0.1