Ansible/masterk8s.yaml

---
- name: Setup nodo master Kubernetes e genera comando join
  hosts: master
  become: yes
  vars:
    master_hostname: k8s-m
    master_ip: 192.168.1.17
    kube_version: "1.34"
    calico_manifest: "https://raw.githubusercontent.com/projectcalico/calico/v3.30.3/manifests/calico.yaml"
    dashboard_manifest: "https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml"

  tasks:
    - name: Aggiorna sistema operativo
      dnf:
        name: "*"
        state: latest
        update_cache: yes

    - name: Imposta hostname master
      hostname:
        name: "{{ master_hostname }}"

    - name: Aggiunge voce hosts master
      lineinfile:
        path: /etc/hosts
        line: "{{ master_ip }} {{ master_hostname }}"

    - name: Disabilita swap temporaneamente e permanentemente
      block:
        - command: swapoff -a
          args:
            warn: false
          changed_when: false
        - replace:
            path: /etc/fstab
            regexp: '(^.* swap .*$)'
            replace: '#\1'

    - name: Imposta SELinux in permissive (runtime e config)
      block:
        - command: setenforce 0
          args:
            warn: false
        - lineinfile:
            path: /etc/selinux/config
            regexp: '^SELINUX='
            line: 'SELINUX=permissive'

    - name: Configura firewall master
      firewalld:
        port: "{{ item }}/tcp"
        permanent: yes
        state: enabled
      loop: [6443,2379,2380,10250,10251,10252,10257,10259,179]

    - name: Apre porta UDP firewall master
      firewalld:
        port: 4789/udp
        permanent: yes
        state: enabled

    - name: Ricarica firewall
      command: firewall-cmd --reload
      args:
        warn: false

    - name: Carica moduli kernel containerd
      copy:
        dest: /etc/modules-load.d/containerd.conf
        content: |
          overlay
          br_netfilter

    - name: Carica modulo overlay
      modprobe:
        name: overlay
        state: present

    - name: Carica modulo br_netfilter
      modprobe:
        name: br_netfilter
        state: present

    - name: Configura sysctl per Kubernetes
      copy:
        dest: /etc/sysctl.d/k8s.conf
        content: |
          net.bridge.bridge-nf-call-iptables = 1
          net.ipv4.ip_forward = 1
          net.bridge.bridge-nf-call-ip6tables = 1

    - name: Applica sysctl
      command: sysctl --system
      args:
        warn: false

    - name: Aggiungi repo Docker per containerd
      get_url:
        url: https://download.docker.com/linux/centos/docker-ce.repo
        dest: /etc/yum.repos.d/docker-ce.repo

    - name: Installa containerd
      dnf:
        name: containerd.io
        state: present

    - name: Configura containerd systemd
      shell: |
        containerd config default > /etc/containerd/config.toml
        sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml

    - name: Riavvia e abilita containerd
      systemd:
        name: containerd
        state: restarted
        enabled: yes

    - name: Aggiungi repo Kubernetes
      copy:
        dest: /etc/yum.repos.d/kubernetes.repo
        content: |
          [kubernetes]
          name=Kubernetes
          baseurl=https://pkgs.k8s.io/core:/stable:/v{{ kube_version }}/rpm/
          enabled=1
          gpgcheck=1
          gpgkey=https://pkgs.k8s.io/core:/stable:/v{{ kube_version }}/rpm/repodata/repomd.xml.key
          exclude=kubelet kubeadm kubectl cri-tools kubernetes-cni

    - name: Installa kubelet kubeadm kubectl
      dnf:
        name:
          - kubelet
          - kubeadm
          - kubectl
        state: present
        disable_excludes: kubernetes

    - name: Avvia e abilita kubelet
      systemd:
        name: kubelet
        state: started
        enabled: yes

    - name: Inizializza cluster Kubernetes
      command: kubeadm init --control-plane-endpoint="{{ master_hostname }}"
      register: kubeadm_init

    - name: Configura kubectl per utente corrente
      shell: |
        mkdir -p $HOME/.kube
        cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
        chown $(id -u):$(id -g) $HOME/.kube/config

    - name: Installa Calico CNI
      command: kubectl apply -f {{ calico_manifest }}

    - name: Installa Kubernetes Dashboard
      command: kubectl apply -f {{ dashboard_manifest }}

    - name: Deploy nginx di test
      command: kubectl create deployment web-app01 --image nginx --replicas 2

    - name: Espone nginx via NodePort
      command: kubectl expose deployment web-app01 --type NodePort --port 80

    - name: Crea token per join worker (comando)
      shell: kubeadm token create --print-join-command
      register: join_command
      changed_when: false

    - name: Mostra comando join da usare nei worker
      debug:
        msg: "{{ join_command.stdout }}"