homelab-nomad/setup-cluster.yml

---
- name: Build Consul cluster
  hosts: consul_instances
  any_errors_fatal: true

  vars_files:
    - consul_values.yml

  roles:
    - role: ansible-consul
      vars:
        consul_version: "1.13.1-1"
        consul_install_upgrade: true
        consul_install_from_repo: true
        consul_os_repo_prerequisites: []

        consul_node_role: server
        consul_bootstrap_expect: true

        consul_user: consul
        consul_manage_user: true
        consul_group: bin
        consul_manage_group: true

        consul_architecture_map:
          x86_64: amd64
          armhfv6: arm
          armv7l: arm

        # consul_tls_enable: true
        consul_connect_enabled: true
        consul_ports_grpc: 8502
        consul_client_address: "0.0.0.0"

        # Enable metrics
        consul_config_custom:
          telemetry:
            prometheus_retention_time: "2h"

        # DNS forwarding
        consul_dnsmasq_enable: true
        consul_dnsmasq_servers:
          # TODO: use addresses of other nomad nodes?
          # Maybe this can be [] to get the values from dhcp
          - 1.1.1.1
          - 1.0.0.1
        consul_dnsmasq_bind_interfaces: true
        consul_dnsmasq_listen_addresses:
          # Listen only to loopback interface
          - 127.0.0.1

      become: true

  tasks:
    - name: Start Consul
      systemd:
        state: started
        name: consul
      become: true

    # If DNS is broken after dnsmasq, then need to set /etc/resolv.conf to something
    # pointing to 127.0.0.1 and possibly restart Docker and Nomad

    - name: Add values
      delegate_to: localhost
      run_once: true
      block:
        - name: Install python-consul
          pip:
            name: python-consul
            extra_args: --index-url https://pypi.org/simple

        - name: Write values
          consul_kv:
            host: "{{ inventory_hostname }}"
            key: "{{ item.key }}"
            value: "{{ item.value }}"
          loop: "{{ consul_values | default({}) | dict2items }}"

- name: Setup Vault cluster
  hosts: vault_instances

  vars_files:
    - ./vault_hashi_vault_values.yml

  roles:
    - name: ansible-vault
      vars:
        vault_version: 1.11.2-1
        vault_install_hashi_repo: true
        vault_harden_file_perms: true
        vault_bin_path: /usr/bin
        vault_address: 0.0.0.0

        vault_backend: consul
      become: true

  tasks:
    - name: Get Vault status
      uri:
        url: http://127.0.0.1:8200/v1/sys/health
        method: GET
        status_code: 200, 429, 472, 473, 501, 503
        body_format: json
        return_content: true
      run_once: true
      register: vault_status

    - name: Initialize Vault
      when: not vault_status.json["initialized"]
      block:
        - name: Initialize Vault
          command:
            argv:
              - "vault"
              - "operator"
              - "init"
              - "-format=json"
              - "-address=http://127.0.0.1:8200/"
              - "-key-shares={{ vault_init_key_shares|default(3) }}"
              - "-key-threshold={{ vault_init_key_threshold|default(2) }}"
          run_once: true
          register: vault_init

        - name: Save initialize result
          copy:
            content: "{{ vault_init.stdout }}"
            dest: "./vault-keys.json"
          when: vault_init is succeeded
          delegate_to: localhost
          run_once: true

        - name: Unseal from init
          no_log: true
          command:
            argv:
              - "vault"
              - "operator"
              - "unseal"
              - "-address=http://127.0.0.1:8200/"
              - "{{ item }}"
          loop: "{{ (vault_init.stdout | from_json)['unseal_keys_hex'] }}"
          when: vault_init is succeeded

    - name: Unseal Vault
      no_log: true
      command:
        argv:
          - "vault"
          - "operator"
          - "unseal"
          - "-address=http://127.0.0.1:8200/"
          - "{{ item }}"
      loop: "{{ unseal_keys_hex }}"
      when:
        - unseal_keys_hex is defined
        - vault_status.json["sealed"]

    - name: Bootstrap Vault secrets
      delegate_to: localhost
      run_once: true
      block:
        - name: Install hvac
          pip:
            name: hvac
            extra_args: --index-url https://pypi.org/simple

        # TODO: This fails on first run because `root_token` isn't found
        # Fails after taht too because the kv/ space has not been created yet either! Oh noes!
        # Maybe move data bootstrapping to after the cluster is bootstrapped
        - name: Write values
          no_log: true
          community.hashi_vault.vault_write:
            url: "http://{{ inventory_hostname }}:8200"
            token: "{{ root_token }}"
            path: "kv/data/{{ item.key }}"
            data:
              data:
                "{{ item.value }}"
          loop: "{{ hashi_vault_values | default({}) | dict2items }}"

# Not on Ubuntu 20.04
# - name: Install Podman
#   hosts: nomad_instances
#   become: true
#
#   tasks:
#     - name: Install Podman
#       package:
#         name: podman
#         state: present

- name: Create NFS mounts
  hosts: nomad_instances
  become: true

  tasks:
    - name: Install nfs
      package:
        name: nfs-common
        state: present

    - name: Create Motioneye NFS mount
      ansible.posix.mount:
        src: 192.168.2.10:/Recordings/Motioneye
        path: /srv/volumes/motioneye-recordings
        opts: proto=tcp,port=2049,rw
        state: mounted
        fstype: nfs4

    - name: Create Media Library RO NFS mount
      ansible.posix.mount:
        src: 192.168.2.10:/Multimedia
        path: /srv/volumes/media-read
        opts: proto=tcp,port=2049,ro
        state: mounted
        fstype: nfs4

- name: Install Docker
  hosts: nomad_instances
  become: true
  vars:
    deb_arch: "{% if ansible_architecture == 'x86_64' %}amd64{% elif ansible_architecture == 'armv7l' %}armhf{% endif %}"
    docker_apt_arch: "{{ deb_arch }}"
    docker_compose_arch: "{{ (ansible_architecture == 'armv7l') | ternary('armv7', ansible_architecture) }}"
  roles:
    - geerlingguy.docker

- name: Build Nomad cluster
  hosts: nomad_instances
  any_errors_fatal: true
  become: true

  vars:
    shared_host_volumes:
      - name: motioneye-recordings
        path: /srv/volumes/motioneye-recordings
        owner: "root"
        group: "bin"
        mode: "0755"
        read_only: false
      - name: media-read
        path: /srv/volumes/media-read
        owner: "root"
        group: "root"
        mode: "0777"
        read_only: true
      - name: all-volumes
        path: /srv/volumes
        owner: "root"
        group: "root"
        mode: "0777"
        read_only: false

  roles:
    - name: ansible-nomad
      vars:
        nomad_version: "1.3.4-1"
        nomad_install_upgrade: true
        nomad_allow_purge_config: true

        # Where nomad gets installed to
        nomad_bin_dir: /usr/bin
        nomad_install_from_repo: true

        # nomad_user: root
        # nomad_manage_user: true
        # nomad_group: bin
        # nomad_manage_group: true

        # Properly map install arch
        nomad_architecture_map:
          x86_64: amd64
          armhfv6: arm
          armv7l: arm

        nomad_autopilot: true
        nomad_encrypt_enable: true
        # nomad_use_consul: true

        # Metrics
        nomad_telemetry: true
        nomad_telemetry_prometheus_metrics: true
        nomad_telemetry_publish_allocation_metrics: true
        nomad_telemetry_publish_node_metrics: true

        # Enable container plugins
        nomad_cni_enable: true
        nomad_cni_version: 1.0.1
        nomad_docker_enable: true
        nomad_docker_dmsetup: false
        # nomad_podman_enable: true

        # Merge shared host volumes with node volumes
        nomad_host_volumes: "{{ shared_host_volumes + (nomad_unique_host_volumes | default([])) }}"

        # Customize docker plugin
        nomad_plugins:
          docker:
            config:
              allow_privileged: true
              volumes:
                enabled: true
                selinuxlabel: "z"
              extra_labels:
                - "job_name"
                - "job_id"
                - "task_group_name"
                - "task_name"
                - "namespace"
                - "node_name"
                - "node_id"

        # Bind nomad
        nomad_bind_address: 0.0.0.0

        # Default interface for binding tasks
        # nomad_network_interface: lo

        # Create networks for binding task ports
        nomad_host_networks:
          # - name: public
          #   interface: eth0
          #   reserved_ports: "22"
          - name: nomad-bridge
            interface: nomad
            reserved_ports: "22"
          - name: loopback
            interface: lo
            reserved_ports: "22"

        # Enable ACLs
        nomad_acl_enabled: true

        # Enable vault integration
        # TODO: This fails on first run because the Nomad-Vault integration can't be set up
        # until Nomad has started. Could maybe figure out if ACLs have been set up and leave
        # these out until the later play, maybe just bootstrap the nomad-cluster role in Vault
        # befor Nomad is set up
        nomad_vault_address: "http://vault.service.consul:8200"
        nomad_vault_create_from_role: "nomad-cluster"
        # TODO: Probably want to restict this to a narrower scoped token
        nomad_vault_enabled: "{{ root_token is defined }}"
        nomad_vault_token: "{{ root_token | default('') }}"

        nomad_config_custom:
          ui:
            enabled: true
            consul:
              ui_url: "http://{{ ansible_hostname }}:8500/ui"
            vault:
              ui_url: "http://{{ ansible_hostname }}:8200/ui"
          consul:
            tags:
              - "traefik.enable=true"
              - "traefik.consulcatalog.connect=true"
              - "traefik.http.routers.nomadclient.entrypoints=websecure"

  tasks:
    - name: Start Nomad
      systemd:
        state: started
        name: nomad

- name: Bootstrap Nomad ACLs
  hosts: nomad_instances

  tasks:
    # Need to wait until nomad is running
    - name: Bootstrap ACLs
      command:
        argv:
          - "nomad"
          - "acl"
          - "bootstrap"
          - "-json"
      run_once: true
      ignore_errors: true
      register: bootstrap_result

    - name: Save bootstrap result
      copy:
        content: "{{ bootstrap_result.stdout }}"
        dest: "./nomad_bootstrap.json"
      when: bootstrap_result is succeeded
      delegate_to: localhost
      run_once: true

    - name: Look for policy
      command:
        argv:
          - nomad
          - acl
          - policy
          - list
      run_once: true
      register: policies

    - name: Read secret
      command:
        argv:
          - jq
          - -r
          - .SecretID
          - nomad_bootstrap.json
      delegate_to: localhost
      run_once: true
      no_log: true
      changed_when: false
      register: read_secretid

    - name: Copy policy
      copy:
        src: ./acls/nomad-anon-policy.hcl
        dest: /tmp/anonymous.policy.hcl
      delegate_to: "{{ play_hosts[0] }}"
      register: anon_policy
      run_once: true

    - name: Create anon-policy
      command:
        argv:
          - nomad
          - acl
          - policy
          - apply
          - -description="Anon read only"
          - anonymous
          - /tmp/anonymous.policy.hcl
      environment:
        NOMAD_TOKEN: "{{ read_secretid.stdout }}"
      when: policies.stdout == "No policies found" or anon_policy.changed
      delegate_to: "{{ play_hosts[0] }}"
      run_once: true

    - name: Set up Nomad backend and roles in Vault
      community.general.terraform:
        project_path: ./acls
        force_init: true
        variables:
          consul_address: "{{ play_hosts[0] }}:8500"
          vault_token: "{{ root_token }}"
          nomad_secret_id: "{{ read_secretid.stdout }}"
      delegate_to: localhost
      run_once: true