install_k3s.yaml

---
  - name: Check cgroup configuration on all nodes
    hosts: all
    gather_facts: true

    tasks:
      - name: Check if cgroup config is existing or not
        shell: grep -o "cgroup_memory=1 cgroup_enable=memory" /boot/firmware/cmdline.txt
        register: out
        failed_when: false
        changed_when: false

      - name: Execute if not existing
        shell: |
                cp /boot/cmdline.txt /boot/cmdline.txt.backup.%date
                sed -i 's/$/ cgroup_memory=1 cgroup_enable=memory/g' /boot/firmware/cmdline.txt 
                sleep 5 && shutdown -r now "Ansible Rebooting after cgroup configuration"
        when: "'cgroup_memory=1 cgroup_enable=memory' not in out.stdout"
        async: 0
        poll: 0
        ignore_unreachable: true
        become: true
        become_method: sudo
      
      - name: Waiting for server to come back
        wait_for_connection:
          delay: 5

  - name: Master Node Configuration
    hosts: masternode
    gather_facts: no
    
    tasks: 
      - name: Check if 10250 is Opened 
        wait_for:
          port: 10250
          delay: 5
          timeout: 10
          msg: "10250 is not open"
        register: port_check
        ignore_errors: yes

      - name: Open port 10250 in iptables
        shell: iptables -A INPUT -p tcp --dport 10250 -j ACCEPT
        when: port_check.failed == true
        become: true
        become_method: sudo

      - name: Print message if 10250 is Already Opened 
        debug:
          msg: "10250 is already Opened"
        when: port_check.failed == false

      - name: Install k3s in Master Node
        shell: |
                curl -sfL https://get.k3s.io | sh -
                kubectl get nodes
        become: true
        become_method: sudo

  - name: Gather IP and Node Token from Master Node 
    hosts: masternode
    gather_facts: no

    tasks:
      - name: Get the IP of Master Node
        shell: hostname -I | awk '{print$1}'
        register: masterIP

      - name: Get the Node Token value from the Master
        shell: cat /var/lib/rancher/k3s/server/node-token
        become: true
        become_method: sudo
        register: nodeToken
      
      - name: Add to a dummy host
        add_host:
          name: "K3s_MASTER_DETAILS"
          masterip: "{{ masterIP.stdout }}"
          nodetoken: "{{ nodeToken.stdout }}"
      
  - name: Install K3s in Worker nodes
    hosts: workers
    tasks: 
      - name: Installing K3s agents
        shell: curl -sfL https://get.k3s.io | K3S_URL=https://{{ hostvars['K3s_MASTER_DETAILS']['masterip'] }}:6443 K3S_TOKEN={{ hostvars['K3s_MASTER_DETAILS']['nodetoken'] }} sh -