Gluttony-Cluster/ansible/playbooks/bootstrap-longhorn-drive.yaml

- name: Bootstrap longhorn drive
  hosts: k3s_masters
  become: yes
  vars_files:
    - ../secrets/gluttonycluster-credentials.yaml
    - ../vars/k3s.yaml
  vars:
    longhorn_mount_point: "/media/longhorn"

  tasks:
    - name: Install requirements
      apt:
        name:
          - nfs-common
          - open-iscsi
        state: present
        update_cache: yes

    - name: Ensure iscsi_tcp kernel module is loaded
      ansible.builtin.modprobe:
        name: iscsi_tcp
        state: present

    - name: Ensure iscsi_tcp module is loaded on boot
      ansible.builtin.copy:
        dest: /etc/modules-load.d/iscsi_tcp.conf
        content: |
          iscsi_tcp          
        owner: root
        group: root
        mode: '0644'

    - name: Get the device corresponding to the drive UUID (case-insensitive)
      shell: |
        lsblk -dn -o NAME,PTUUID | awk '{if (NF == 2 && tolower($2) == tolower("{{ longhorn_drive_uuid }}")) print "/dev/" $1}'        
      register: drive_device
      failed_when: drive_device.stdout == ""
      changed_when: false

    - name: Debug drive_device
      debug:
        msg: "Drive device is {{ drive_device.stdout }}"

    - name: Set drive device fact
      set_fact:
        drive_device: "{{ drive_device.stdout }}"

    - name: Get partition device name
      set_fact:
        partition_device: "{{ drive_device }}1"

    - name: Check if partition exists
      stat:
        path: "{{ partition_device }}"
      register: partition_stat

    - name: Create partition on the drive
      parted:
        device: "{{ drive_device }}"
        number: 1
        state: present
        align: optimal
        label: gpt
        unit: MiB
        part_start: 0%
        part_end: 100%
        name: longhorn
      when: partition_stat.stat.exists == false

    - name: Ensure partition table is re-read
      command: "partprobe {{ drive_device }}"
      when: partition_stat.stat.exists == false

    - name: Wait for partition to be available
      wait_for:
        path: "{{ partition_device }}"
        timeout: 10
      when: partition_stat.stat.exists == false

    - name: Check if filesystem exists on the partition
      command: "blkid -o value -s TYPE {{ partition_device }}"
      register: fs_type
      failed_when: false
      changed_when: false

    - name: Format the partition with ext4
      filesystem:
        fstype: ext4
        dev: "{{ partition_device }}"
      when: fs_type.stdout == ""

    - name: Get the UUID of the partition
      command: "blkid -o value -s UUID {{ partition_device }}"
      register: partition_uuid

    - name: Ensure the mount point directory exists
      file:
        path: "{{ longhorn_mount_point }}"
        state: directory
        mode: '0755'

    - name: Ensure the partition is mounted via fstab
      mount:
        path: "{{ longhorn_mount_point }}"
        src: "/dev/disk/by-uuid/{{ partition_uuid.stdout }}"
        fstype: ext4
        opts: defaults
        state: mounted

    - name: Check if the flag file exists
      stat:
        path: /etc/.longhorn_initialized
      register: flag_stat

    - name: Remove all contents from the mount point
      shell: "rm -rf {{ longhorn_mount_point }}/*"
      when: flag_stat.stat.exists == false

    - name: Create the flag file
      file:
        path: /etc/.longhorn_initialized
        state: touch
      when: flag_stat.stat.exists == false

    - name: Check if /etc/multipath.conf exists
      stat:
        path: /etc/multipath.conf
      register: multipath_conf_stat

    - name: Create /etc/multipath.conf with content if it does not exist
      copy:
        dest: /etc/multipath.conf
        content: |
          blacklist {
              devnode "^sd[a-z0-9]+"
          }          
        owner: root
        group: root
        mode: '0644'
      when: not multipath_conf_stat.stat.exists

    - name: Check if blacklist block exists in /etc/multipath.conf
      shell: grep -q '^[[:space:]]*blacklist[[:space:]]*{' /etc/multipath.conf
      register: blacklist_block_check
      failed_when: false
      changed_when: false
      when: multipath_conf_stat.stat.exists

    - name: Append blacklist block to /etc/multipath.conf if it does not exist
      blockinfile:
        path: /etc/multipath.conf
        block: |
          blacklist {
              devnode "^sd[a-z0-9]+"
          }          
        insertafter: EOF
        state: present
      when:
        - multipath_conf_stat.stat.exists
        - blacklist_block_check.rc != 0

    - name: Debug warning if blacklist block already exists
      debug:
        msg: "Warning: 'blacklist' block already exists in /etc/multipath.conf on this host."
      when:
        - multipath_conf_stat.stat.exists
        - blacklist_block_check.rc == 0

    - name: Restart the multipathd service
      service:
        name: multipathd
        state: restarted