step-1-install-dependencies.yaml

- hosts: all
  become: yes
  tasks:
    - name: Remove swap from /etc/fstab (impacts next reboots)
      mount:
        name: swap
        fstype: swap
        state: absent
    - name: Disable swap for the current session
      command: swapoff -a
      when: ansible_swaptotal_mb > 0

    - name: Stop enforcing selinux for the current boot
      command: setenforce 0

    - name: Disable selinux for future boots
      selinux:
        state: disabled

    - name: Disable firewalld
      service:
        name: firewalld
        state: stopped
        enabled: no

    - name: Install docker dependencies
      yum:
        name:
          - yum-utils
          - device-mapper-persistent-data
          - lvm2
        state: present

    - name: Add docker-ce-stable repository
      yum_repository:
        name: docker
        description: docker
        baseurl: https://download.docker.com/linux/centos/7/x86_64/stable
        gpgkey: https://download.docker.com/linux/centos/gpg
        gpgcheck: yes
        exclude: docker*

    - name: Install docker
      yum:
        name: docker-ce-18.09.9
        state: present
        update_cache: true
        allow_downgrade: yes
        disable_excludes: docker

    - name: Create /etc/docker if it does not exist
      file:
        path: /etc/docker
        state: directory
        mode: '0755'
    - name: Add docker daemon configuration
      copy:
        src: docker-daemon.json
        dest: /etc/docker/daemon.json

    - name: Start docker
      service:
        name: docker
        state: started
        enabled: yes

    - name: Set net.bridge.bridge-nf-call-iptables to 1
      sysctl:
        name: net.bridge.bridge-nf-call-iptables
        value: 1
        state: present
        sysctl_set: yes

    - name: Disable ipv6 for all
      sysctl:
        name: net.ipv6.conf.all.disable_ipv6
        value: 1
        state: present
        sysctl_set: yes

    - name: Disable ipv6 for default
      sysctl:
        name: net.ipv6.conf.default.disable_ipv6
        value: 1
        state: present
        sysctl_set: yes

    - name: Add Kubernetes repository
      yum_repository:
        name: kubernetes
        description: kubernetes
        baseurl: https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
        gpgkey: https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
        gpgcheck: yes
        exclude: kube*

    - name: Install kubelet
      yum:
        name: kubelet-1.16.1
        state: present
        disable_excludes: kubernetes
        update_cache: true

    - name: Install kubeadm
      yum:
        name: kubeadm-1.16.1
        state: present
        disable_excludes: kubernetes

    - name: Start kubelet
      service:
        name: kubelet
        enabled: yes
        state: started

    - name: Create centos user
      user:
        name: centos
        password: "$6$QUgphi6lokEKeGo6$JXskjWkxKfk2LhjBpBOCviXuSK6C3dGsvr7BhCOqc4Buv1VBlni9DOu1Iz4AyHwRGan.rqZKnkIDJwG08B35p0"
        groups:
          - docker
        state: present
        shell: /bin/bash
        system: no
        createhome: yes
        home: /home/centos

- hosts: master
  become: yes
  tasks:
    - name: Install kubectl
      yum:
        name: kubectl-1.16.1
        state: present
        allow_downgrade: yes
        disable_excludes: kubernetes