Friz-zy / ansible-mysql-5.7-relication-failover-ubuntu-16.04

Ansible role for installing Mysql 5.7 master-slave with gtid and automatic failover

Ansible role for installing Mysql 5.7 master-slave with gtid and automatic failover

This Ansible role should

1. add Oracle repo into servers
2. protect hosts with UWF firewall
3. install Mysql 5.7 packages
4. configure mysql master-slave replication (replica seed is possible)
5. install Haproxy as mysql frontend
6. install Orchestrator for automatic failover and simply mysql replication management
   Note: resolving hostnames important for orchestrator
7. add mysqldump into root cron on all mysql servers that will take full backup from mysql slave daily

Tested with ubuntu 16.04, debian 8 and ansible 2.3 (and vagrant 1.9)

Important
For avoiding split brains I recommend minimum setup of master + 2 slaves
But this role would work even with master + 1 slave, master initially marked as backup in haproxy exactly for this type of setup

Another Important
By default all servers contain read-only=1 in my.cnf, master would be changed in runtime after setup. So you'll get read only master after any restart except orchestrator auto failover

Minimum variables that you should know and set:

mysql.yml

- name: Mysql Setup
  hosts: mysql
  become: true
  vars:
    replication_user:
      name: replicator
      host: '%'
      password: '_strong_password_'
    root_user:
      name: root
      host: '%'
      password: '_strong_password_'
***
- name: Orchestrator Setup
  hosts: orchestrator
  become: true
  vars:
    mysql_root_user:
      name: root
      password: '_strong_password_'

group_vars/all.yml

mysql_port: 3306
frontend_mysql_master_port: 3310
frontend_mysql_slave_port: 3311

How to test:

1. start vagrant vms

vagrant up

2. run ansible playbook

ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook --ask-pass -i hosts mysql.yml