NewsBlur-viq/ansible/roles/redis/tasks/main.yml

---
- name: Extract part of hostname to determine container name
  set_fact:
    redis_role: "{{ inventory_hostname.split('-')[2] }}"
    redis_port: 6379
    redis_secondary: yes
    redis_secondary_ports:
      story: 6380
      user: 6381
      session: 6382
      pubsub: 6383

- name: Set redis_port for secondary redis servers
  set_fact:
    redis_port: "{{ redis_secondary_ports[redis_role] }}"
    redis_secondary: yes
  when: inventory_hostname not in ["db-redis-user", "db-redis-story1", "db-redis-session", "db-redis-pubsub"]

- name: Install sysfsutils for disabling transparent huge pages
  become: yes
  package:
    name: sysfsutils
    state: latest

- name: Disable transparent huge pages for redis performance - persistent change
  become: yes
  lineinfile:
    path: /etc/sysfs.conf
    create: true
    regexp: '^kernel\/mm\/transparent\_hugepage\/enabled'
    line: "kernel/mm/transparent_hugepage/enabled = never"

- name: Disable transparent huge pages for redis performance - live change
  become: yes
  shell: echo never {{ ">" }} /sys/kernel/mm/transparent_hugepage/enabled
  
- name: Add a vm.overcommit_memory setting at the end of the sysctl.conf
  become: yes
  sysctl: name=vm.overcommit_memory value=1 state=present reload=yes

- name: Template redis.conf file
  copy:
    src: /srv/newsblur/docker/redis/redis.conf
    dest: /srv/newsblur/docker/redis/redis.conf
  notify: restart redis
  register: updated_config

- name: Template redis_replica.conf file
  template:
    src: /srv/newsblur/docker/redis/redis_replica.conf.j2
    dest: "/srv/newsblur/docker/redis/redis_{{ redis_role }}_replica.conf"
  notify: restart redis
  register: updated_config
  when: "'db-redis-story2' not in inventory_hostname"

- name: Create Redis docker volume directory
  file:
    path: /srv/newsblur/docker/volumes
    state: directory
    recurse: yes
    owner: "{{ ansible_effective_user_id|int }}"
    group: "{{ ansible_effective_group_id|int }}"
    
- name: Create Redis docker volume with correct permissions
  file:
    path: "/srv/newsblur/docker/volumes/redis_{{ redis_role }}"
    state: directory
    recurse: yes
    owner: "{{ ansible_effective_user_id|int }}"
    group: "{{ ansible_effective_group_id|int }}"  

- name: Start redis docker containers
  docker_container:
    name: "redis-{{ redis_role }}"
    image: redis:7
    pull: true
    state: started
    command: /usr/local/etc/redis/redis_server.conf
    container_default_behavior: no_defaults
    hostname: "{{ inventory_hostname }}"
    networks_cli_compatible: yes
    # network_mode: host
    network_mode: default
    networks:
      - name: newsblurnet
        aliases: 
          - redis
    ports:
      - "{{ redis_port }}:6379"
    restart_policy: unless-stopped
    user: "{{ ansible_effective_user_id|int }}:{{ ansible_effective_group_id|int }}"
    volumes:
      - "/srv/newsblur/docker/volumes/redis_{{ redis_role }}:/data"
      - /srv/newsblur/docker/redis/redis.conf:/usr/local/etc/redis/redis_server.conf
      - "/srv/newsblur/docker/redis/redis_{{ redis_role }}_replica.conf:/usr/local/etc/redis/redis_replica.conf"

- name: Register redis in consul
  become: yes
  template:
    src: consul_service.json
    dest: "/etc/consul.d/redis_{{ redis_role }}.json"
  notify:
    - reload consul
  tags: consul

- name: Add sanity checkers cronjob for disk usage
  become: yes
  cron:
    name: disk_usage_sanity_checker
    user: root
    cron_file: /etc/cron.hourly/disk_usage_sanity_checker
    job: >-
      docker pull newsblur/newsblur_python3:latest;
      OUTPUT=$(eval sudo df / | head -n 2 |  tail -1);
      docker run --rm -it
      -v /srv/newsblur:/srv/newsblur
      -h `cat /etc/hostname`
      --network=newsblurnet --hostname {{ ansible_hostname }} 
      newsblur/newsblur_python3 /srv/newsblur/utils/monitor_disk_usage.py $OUTPUT
  tags:
    - sanity-checker

- name: Add sanity checkers cronjob for redis bg_save
  become: yes
  cron:
    name: redis_bg_save_sanity_checker
    user: root
    cron_file: /etc/cron.hourly/redis_bg_save_sanity_checker
    job: >-
      docker pull newsblur/newsblur_python3:latest;
      REDIS_LOG_PATH=$(eval docker inspect --format="{{ '{{' }}.LogPath {{ '}}' }}" redis)
      docker run --rm -it
      -v ${REDIS_LOG_PATH}:${REDIS_LOG_PATH}
      -v /srv/newsblur:/srv/newsblur 
      -h `cat /etc/hostname`
      --network=newsblurnet 
      newsblur/newsblur_python3 /srv/newsblur/utils/monitor_redis_bgsave.py $REDIS_LOG_PATH
  when: "'redis' in inventory_hostname"
  tags:
    - sanity-checker

- name: Add redis backup
  cron:
    name: "{{ ansible_hostname }} backup"
    minute: "0"
    hour: "4"
    job: >
      docker run --rm
      -v /srv/newsblur:/srv/newsblur
      -v /srv/newsblur/docker/volumes/redis_{{ redis_role }}/dump.rdb:/data/dump.rdb
      --network=newsblurnet
      --hostname={{ ansible_hostname }}
      newsblur/newsblur_python3 python /srv/newsblur/utils/backups/backup_redis.py