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2_prepare.yml

09-29-2019

Ansible playbooks for building Kubernetes cluster.
Make sure Docker is install and configured.

Add your Master and Worker nodes to the hosts file:
###################################
[master]
master ansible_host=10.1.140.11

[workers]
worker1 ansible_host=10.1.140.12
worker2 ansible_host=10.1.140.13
###################################

Run each playbook in order:
1_depend.yml
2_prepare.yml
3_join.yml

Specify the username for your servers.
Example command:

sudo ansible-playbook /etc/ansible/kube_cluster/1_depend.yml --user MyUser --ask-pass --ask-become-pass

Language or Platform: Python

Code:

# Prepare Kubernetes
- hosts: master
  vars:

    # use home_usr to specify your ssh username for the master server
    home_usr: MYUSERNAME

  become: yes
  tasks:
    - name: Disable Swap for Kubernetes | Also make sure you have 2 or more CPU
      become: true
      shell: |
        swapoff -a
        sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
      args:
        executable: /bin/bash  
       
    - name: Enable Docker service
      become: true
      shell: systemctl enable docker.service
      args:
        executable: /bin/bash

    - name: initialize the cluster
      become: true
      shell: kubeadm init --pod-network-cidr=192.168.0.0/16 >> cluster_initialized.txt
      args:
        chdir: /home/{{ home_usr }}
        creates: cluster_initialized.txt

    - name: create .kube directory
      file:
        path: /home/{{ home_usr }}/.kube
        state: directory
        mode: 0755

    - name: copy admin.conf to user's kube config
      become: true
      copy:
        src: /etc/kubernetes/admin.conf
        dest: /home/{{ home_usr }}/.kube/config
        remote_src: yes
        owner: "{{ home_usr }}"

    - name: Set ownership recursively
      become: true
      file:
        path: /home/{{ home_usr }}/.kube
        state: directory
        recurse: yes
        owner: "{{ home_usr }}"
        group: "{{ home_usr }}"

    - name: install Pod network (Calico)
      become_user: "{{ home_usr }}"
      shell: |
        kubectl apply -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml
        kubectl taint nodes --all node-role.kubernetes.io/master-
      args:
        chdir: /home/{{ home_usr }}
        executable: /bin/bash

- hosts: workers
  become: yes
  tasks:
    - name: Disable Swap for Kubernetes | Also make sure you have 2 or more CPU
      become: true
      shell: |
        swapoff -a
        sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
      args:
        executable: /bin/bash

    - name: Enable Docker service
      become: true
      shell: systemctl enable docker.service
      args:
        executable: /bin/bash

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