Ansible自动化部署MySQL主从

1、添加hosts文件

# vim /etc/ansible/hosts 
[mysql_slave]
1.1.1.2 ansible_ssh_user=root ansible_ssh_pass=Root
[mysql_master]
1.1.1.1 ansible_ssh_user=root ansible_ssh_pass=Root

2.创建mysql角色文件，用于调用mysql_repl

  1 - hosts: mysql_master
  2   remote_user: root
  3   gather_facts: False
  4   roles:
  5     - {role: mysql_repl,mysql_repl_role: master}
  6 
  7 - hosts: mysql_slave
  8   remote_user: root
  9   gather_facts: False
 10   roles:
 11     - {role: mysql_repl,mysql_repl_role: slave,mysql_repl_master: 1.1.1.1,my    sql_repl_user: [{name: repl,passwd: repl}]}

3.创建变量文件

  1 ---
  2 source_dir: /home/db/mysql/src/
  3 mysql_root_pwd: redhat123
  4 mysql_port: 13306
  5 socket: /tmp/mysql.sock
  6 
  7 mysql_db:
  8 - name: test1
  9   replicate: yes
 10 - name: test2
 11   replicate: no
 12 - name: test3
 13   replicate: no
 14 
 15 mysql_remote_user:
 16 - name: remote
 17   passwd: remote
 18   priv: "*.*:ALL"
 19 
 20 mysql_repl_user:
 21 - name: repl
 22   passwd: repl
 23   priv: '*.*:"REPLICATION SLAVE"'

4.创建任务文件

- name: install MySQL-python
  yum: name=MySQL-python

#- name: create repl database
#  mysql_db: name={{item.name}} login_host=127.0.0.1 login_port={{mysql_port}} login_user=root login_password={{mysql_root_pwd}} state=present
#  with_items: mysql_db
#  when: mysql_repl_role == "master"

- name: create database remote user
  mysql_user: login_host=127.0.0.1 login_port={{mysql_port}} login_user=root login_password={{mysql_root_pwd}} name={{item.name}} password={{item.passwd}} priv={{item.priv}} state=present host="%"
  with_items: mysql_remote_user
  when: mysql_remote_user|lower() != 'none'

- name: create replication user
  mysql_user: login_host=127.0.0.1 login_port={{mysql_port}} login_user=root login_password={{mysql_root_pwd}} name={{item.name}} password={{item.passwd}} priv={{item.priv}} state=present host="%"
  with_items: mysql_repl_user
  when: mysql_repl_role == "master"

- name: copy modify replication db script to client
  template: src=modify_repldb.sh dest={{source_dir}} owner=root group=root mode=0775
  
- name: modify replication db in my.cnf
  shell: bash {{source_dir}}/modify_repldb.sh


- name: restart mysqld service
  #service: name=mysqld state=restarted
  command: su mysql -c "service mysqld restart"

- name: check if slave is already configured for replication
  mysql_replication: login_unix_socket={{socket}} login_user=root login_password={{mysql_root_pwd}} mode=getslave
  ignore_errors: true
  register: slave
  when: mysql_repl_role == "slave"

- name: get the current master servers replication status
  mysql_replication: login_unix_socket={{socket}} login_user=root login_password={{mysql_root_pwd}} mode=getmaster
  delegate_to: "{{mysql_repl_master}}"
  register: repl_master_status
  when: slave|failed and mysql_repl_role == "slave" and mysql_repl_master is defined

- name: change the master on slave to start the replication
  mysql_replication: login_unix_socket={{socket}} login_user=root login_password={{mysql_root_pwd}} mode=changemaster master_host={{mysql_repl_master}} master_port={{mysql_port}} master_log_file={{repl_master_status.File}} master_log_pos={{repl_master_status.Position}} master_user={{mysql_repl_user[0].name}} master_password={{mysql_repl_user[0].passwd}}
  ignore_errors: true
  when: slave|failed and mysql_repl_role == "slave" and mysql_repl_master is defined

- name: start slave on slave to start the replication
  mysql_replication: login_unix_socket={{socket}} login_user=root login_password={{mysql_root_pwd}} mode=startslave
  when: slave|failed and mysql_repl_role == "slave" and mysql_repl_master is defined

5.编写模板脚本

vim templates/modify_repldb.sh
#!/bin/bash
#auth:yanggd
#content: modify replication db

{% if mysql_repl_role == "master" %}
{% for i in mysql_db %}
{% if i.replicate|default(1) %}
sed -i "/server-id/a replicate-do-db={{i.name}}" /etc/my.cnf
sed -i "/server-id/a binlog-do-db={{i.name}}" /etc/my.cnf
{% endif %}
{% endfor %}

{% for i in mysql_db %}
{% if not i.replicate|default(1) %}
sed -i "/server-id/a binlog-ignore-db={{i.name}}" /etc/my.cnf
{% endif %}
{% endfor %}
{% endif %}


{% if mysql_repl_role == "slave" %}
{% for i in mysql_db %}
{% if i.replicate|default(1) %}
sed -i "/server-id/a replicate-do-db={{i.name}}" /etc/my.cnf
{% endif %}
{% endfor %}

{% for i in mysql_db %}
{% if not i.replicate|default(1) %}
sed -i "/server-id/a binlog-ignore-db={{i.name}}" /etc/my.cnf
{% endif %}
{% endfor %}
{% endif %}