Redis

This role installs and configures Redis server (with the version of your choice), Redis Sentinel and lets you setup a Redis replication set.

Installation

This role requires at least Ansible v1.9. To install it, run:

ansible-galaxy install DimitriSteyaert/redis

Role variables

List of default variables available in the inventory:

---
# General Redis parameters that apply to this role itself
redis_server_install: true
redis_version: latest
redis_server_state: present
redis_server_purge: no

# Redis configuration parameters
redis_bind_address: 127.0.0.1
redis_protected_mode: 'yes'
redis_port: 6379
redis_loglevel: notice
redis_logfile: /var/log/redis/redis-server.log
redis_number_of_databases: 16
redis_maxclients: 10000
redis_maxmemory: 512mb
redis_maxmemory_policy: noeviction
redis_tcp_keepalive: 60
redis_password: false
redis_ulimit: 65536

# Redis replication parameters
redis_slaveof: false

# General Redis Sentinel parameters
redis_sentinel_install: false
redis_sentinel_version: latest
redis_sentinel_server_state: present
redis_sentinel_server_purge: no

# Sentinel configuration parameters
redis_sentinel_bind_address: 127.0.0.1
redis_sentinel_protected_mode: 'yes'
redis_sentinel_port: 26379
redis_sentinel_monitors:
  - name: redis-cluster
    host: 127.0.0.1
    port: 6379
    quorum: 2
    down_after_milliseconds: 15000
    failover_timeout: 120000
    parallel_syncs: 1
redis_sentinel_ulimit: 65536

Detailed usage guide

If you just enable this role on your machine(s) then you perform a basic Redis server installation with the latest version. But by tweaking the role variables you can choose to install another version of Redis server, install Sentinel as an additional service, just install Sentinal without the Redis server or setup replication. Just check the following examples to get an idea on how to realise this.

Examples

This is a basic playbook to install Redis with the default variables:

---
- hosts: all
  roles:
    - redis

If you wish to install a Redis server version that is not the latest available version from the package manager then you can define the redis_version variable like this:

---
redis_version: '2:3.0.0-1~dotdeb+jessie.1'

To entirely wipe your Redis server configuration you can set the following variables:

---
redis_server_state: absent
redis_server_purge: yes

If in case you want to install a standalone Redis Sentinel without a Redis server then you should modify your variables like this:

---
redis_server_install: false
redis_sentinel_install: true

If you want to install a full blown Redis replication set with Sentinels (which should consist of at least 3 servers as described in the best practices) you can follow this example:

---
- hosts: redis01
  vars:
    - redis_bind_address: "127.0.0.1 {{ hostvars['redis01'].ansible_eth0.ipv4.address }}"
    - redis_password: SECURE_PASSWORD
    - redis_slaveof: false
    - redis_sentinel_install: true
    - redis_sentinel_bind_address: "0.0.0.0"
    - redis_sentinel_monitors:
      - name: redis-cluster
        host: 192.168.0.1
        port: 6379
        quorum: 2
        down_after_milliseconds: 15000
        failover_timeout: 120000
        parallel_syncs: 1
  roles:
    - redis

- hosts: redis02
  vars:
    - redis_bind_address: "127.0.0.1 {{ hostvars['redis02'].ansible_eth0.ipv4.address }}"
    - redis_password: SECURE_PASSWORD
    - redis_slaveof: "192.168.0.1 6379"
    - redis_sentinel_install: true
    - redis_sentinel_bind_address: "0.0.0.0"
    - redis_sentinel_monitors:
      - name: redis-cluster
        host: 192.168.0.1
        port: 6379
        quorum: 2
        down_after_milliseconds: 15000
        failover_timeout: 120000
        parallel_syncs: 1
  roles:
    - redis

- hosts: redis03
  vars:
    - redis_bind_address: "127.0.0.1 {{ hostvars['redis03'].ansible_eth0.ipv4.address }}"
    - redis_password: SECURE_PASSWORD
    - redis_slaveof: "192.168.0.1 6379"
    - redis_sentinel_install: true
    - redis_sentinel_bind_address: "0.0.0.0"
    - redis_sentinel_monitors:
      - name: redis-cluster
        host: 192.168.0.1
        port: 6379
        quorum: 2
        down_after_milliseconds: 15000
        failover_timeout: 120000
        parallel_syncs: 1
  roles:
    - redis

Authors and license

The redis role was written by:

• Dimitri Steyaert | e-mail | Twitter

License: MIT

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README generated by Ansigenome.