Consul

Install, configure and maintain Consul - a service mesh from HashiCorp.

Role Philosophy

Instead of duplicating every single configuration option as an Ansible variable Consul configuration is stored in Ansible inventory in yaml format:

consul_config:
  data_dir: "/var/lib/consul/"

  enable_syslog: true
  # "trace", "debug", "info", "warn", "err"
  log_level: "info"
  syslog_facility: "LOCAL5"

  rejoin_after_leave: true

  bind_addr: !unsafe '{{ GetInterfaceIP "eth0" }}'

  telemetry:
    disable_hostname: true
    prometheus_retention_time: "30s"

  server: false

And then copied to host using no_nice_json filter:

- name: copy consul config
  copy:
    content: "{{ consul_config | to_nice_json }}"
    dest: "/opt/consul/consul.json"
    validate: "consul validate -config-format=json %s"

When variable is a map (consul_services for example) every key of a map will be copied as file with value as a content.

The following map

consul_services:
  consul:
    service:
      id: "consul-api"
      name: "consul-api"
      port: 8500
      tags:
        - "traefik.enable=true"
        - "traefik.http.routers.consul.entrypoints=https"
        - "traefik.http.routers.consul.rule=Host(`consul.example.com`)"
      meta:
        external-source: "consul"
      check:
        id: "consul-api-health"
        name: "consul-api-health"
        http: "http://localhost:8500/v1/agent/self"
        interval: "20s"
        timeout: "2s"

  telegraf:
    service:
      id: "telegraf-exporter"
      name: "telegraf-exporter"
      port: 9271
      meta:
        external-source: "consul"
      check:
        id: "telegraf-exporter-health"
        name: "telegraf-exporter-health"
        http: "http://localhost:9270"
        interval: "20s"
        timeout: "2s"

will produce files consul.json and telegraf.json in /opt/consul/service.d/.

Files that are not present in the map will be deleted, thus allowing to maintain a state with Ansible inventory.

Role Variables

See defaults/ for details and examples.

consul_version

• version to use

consul_dirs

• a map of directories to create
• default:

consul_dir: "/opt/consul"
consul_dirs:
  main:
    path: "{{ consul_dir }}"
  configs:
    path: "{{ consul_dir }}/config.d"
  services:
    path: "{{ consul_dir }}/service.d"
  certs:
    path: "{{ consul_dir }}/certs"
    mode: "u=rwX,g=rX,o="
  scripts:
    path: "{{ consul_dir }}/script.d"
  logs:
    path: "/var/log/consul"
  data:
    path: "/var/lib/consul"
    mode: "u=rwX,g=rX,o="

consul_config

• main configuration file
• example: please see defaults/example.yml

consul_configs

• map of configuration files to create in config.d directory. Restart on changes

consul_services

• map of service files to create in service.d directory. Reload on changes

consul_scripts

• map of scripts to create in scripts.d directory

consul_user

• owner of Consul process and files
• default: consul

consul_group

• group of consul_user
• default: consul

consul_download_url

• url to get Consul archive from
• default: https://releases.hashicorp.com

consul_service

• openrc service file
• default: see defaults/main.yml

consul_unitfile

• systemd unit file
• default: see defaults/main.yml

skip_handlers

• skipt consul restart/reload - useful when building images with packer
• default: false

Tags

• config - update Consul unit/service file and sync configuration files
• services - sync Consul services
• scripts - sync Consul scripts

Author

• Anatoly Laskaris - nahsi