kubernetes_master.yaml

---
- hosts: k8s_master


  tasks:
   - name: adding kubernetes.repo
     shell: |
       cmd: |
       cat > /etc/yum.repos.d/kubernetes.repo << EOF
       [kubernetes]
       name=Kubernetes
       baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
       enabled=1
       gpgcheck=1
       repo_gpgcheck=1
       gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
       exclude=kubelet kubeadm kubectl


   - name: selinuc set to 0
     command: setenforce 0


   - name: editing the selinux config file SELINUX 'enforcing' to 'disabled'
     lineinfile:
       path: /etc/selinux/config
       regexp: '^SELINUX=enforcing'
       line: SELINUX=disabled


   - name: reboot the server and wait for it to come back.
     reboot:


   - name: checking selinux satatus
     command: sestatus
     register: result


   - name: printing selinux satatus
     debug: var=result.stdout


   - name: installing kubelet, kubeadm, kubectl & enableing kubelet
     command: '{{item.cmdval}}'
     with_items:
      - { cmdval: 'yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes' }
      - { cmdval: 'systemctl enable --now kubelet' }


   - name: adding docker-ce.repo
     command: yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo


   - name: installing docker-celi, docker-ce-cli, containerd.io & iptables
     command: '{{item.cmdval}}'
     with_items:
      - { cmdval: 'yum install docker-ce docker-ce-cli containerd.io --nobest -y' }
      - { cmdval: 'yum install iptables -y' }


   - name: Check for the docker version
     command: docker --version
     register: result


   - name: printing docker version
     debug: var=result.stdout


   - name: Starting, enable docker, daemon_reload & restart
     command: '{{item.cmdval}}'
     with_items:
       - { cmdval: 'systemctl enable docker'}
       - { cmdval: 'systemctl start docker'}
       - { cmdval: 'systemctl daemon-reload'}
       - { cmdval: 'systemctl restart kubelet'}


   - name: runing kubeadm init, basic setup for K8s config & applying the template
     command: '{{item.cmdval}}'
     with_items:
       - { cmdval: 'kubeadm init --pod-network-cidr=192.168.0.0/16'}
       - { cmdval: 'mkdir -p $HOME/.kube'}
       - { cmdval: 'cp -i /etc/kubernetes/admin.conf $HOME/.kube/config'}
       - { cmdval: 'kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml'}


   - name: creating token
     command: kubeadm token create --print-join-command
     register: result


   - name: printing token
     debug: var=result.stdout


   - name: wait for 30 seconds and continue
     wait_for: timeout=30


   - name: checking node status
     command: kubectl get node
     register: result


   - name: printing node status
     debug: var=result.stdout