Simple Nomad installation and updating using Ansible

install_nomad_server.yaml

# To update to a new version of Nomad:
# Download and calculate checksums:
#  http --download https://releases.hashicorp.com/nomad/0.8.4/nomad_0.8.4_linux_amd64.zip
#  shasum --algorithm 256 --binary nomad_0.8.4_linux_amd64.zip
#  unzip nomad_0.8.4_linux_amd64.zip
#  shasum --algorithm 256 --binary nomad
# Update facts in this script
# Only run on one hashimaster at a time!

- name: Set nomad version
  set_fact:
    nomad_version: "0.8.4"

- name: Set nomad variables
  set_fact:
    nomad_url: "https://releases.hashicorp.com/nomad/{{ nomad_version }}/nomad_{{ nomad_version }}_linux_amd64.zip"
    nomad_checksum: "238bd6da77e0a7e46ae710d6a12719514a9be252c45f9aebe424305954f24169"
    nomad_zip_checksum: "42fc455d09ea0085cc79d7be4fb2089a9ab7db3cc2e8047e8437855a81b090e9"

- name: Make Nomad folders
  file:
    path: "{{ item }}"
    state: directory
    owner: "{{ user }}"
    group: "{{ user }}"
    mode: 0775
  with_items: ["{{ ansible_env.HOME }}/.nomad", "/etc/nomad", "/var/lib/nomad"]

- name: Check for existence of Nomad and get stats
  stat:
    path: /usr/bin/nomad
    checksum_algorithm: "sha256"
  register: existing_file

- name: Check if Nomad checksum matches
  set_fact:
    nomad_version_mismatch: "{{ existing_file.stat.checksum is not defined or (existing_file.stat.checksum != nomad_checksum) }}"

- name: Download Nomad
  get_url:
    url: "{{ nomad_url }}"
    dest: "{{ ansible_env.HOME }}/.nomad"
    checksum: "sha256:{{ nomad_zip_checksum }}"
  when: nomad_version_mismatch

- name: Install unzip
  apt:
    name: "{{ item }}"
    state: present
  with_items: ["unzip"]
  when: nomad_version_mismatch

- name: Unzip Nomad
  unarchive:
    src: "{{ ansible_env.HOME }}/.nomad/nomad_{{ nomad_version }}_linux_amd64.zip"
    dest: "{{ ansible_env.HOME }}/.nomad/"
    copy: no
  when: nomad_version_mismatch

- name: Copy Nomad to /usr/bin
  command: "cp {{ ansible_env.HOME }}/.nomad/nomad /usr/bin/nomad"
  when: nomad_version_mismatch

- name: Template Nomad server configuration
  template:
    src: server.hcl
    dest: /etc/nomad/server.hcl
    owner: "{{ user }}"
    group: "{{ user }}"
    mode: 0775

- name: Copy systemd configuration
  copy:
    src: nomad.service
    dest: /etc/systemd/system/nomad.service
    owner: "{{ user }}"
    group: "{{ user }}"
    mode: 0775

- name: Restart nomad systemd service
  service:
    name: "{{ item }}"
    state: restarted
  with_items: ["nomad"]
  when: nomad_version_mismatch

nomad.service

[Unit]
Description=Nomad
Documentation=https://nomadproject.io/docs/

[Service]
KillMode=process
KillSignal=SIGINT
ExecStart=/usr/bin/nomad agent -config /etc/nomad
ExecReload=/bin/kill -HUP $MAINPID
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

server.hcl

bind_addr = "{{ ansible_eth1.ipv4.address }}"
data_dir = "/var/lib/nomad"
datacenter = "your_datacenter"

addresses {
    http = "0.0.0.0"
}

server {
    enabled = true
    bootstrap_expect = {{ nomad_host_count }}
    server_join {
        retry_join = ["provider=your_provider region=lon1 tag_name=nomad_server api_token={{ lookup('env','YOUR_TOKEN') }}"]
    }
}

consul {
    address = "127.0.0.1:8500"
}