基于ansible批量实现部署数据库主从复制

环境：

node1	192.168.47.20	Master
node2	192.168.47.30	slave

1、首先定义好主机清单组

[student@server ansible]$ cat inventory
[mysql]
node1
node2

[mysql_master]
node1

[mysql_slave]
node2


//手动定义角色
[student@server roles]$ ansible-galaxy init mysql




**定义数据库主从复制优先级**
```sql
[student@server mysql]$ cat templates/slave.cnf.j2 
[mysqld]
log_bin=mysql-bin
server_id=10           ——数值越小的优先级越高


[student@server mysql]$ cat templates/master.cnf.j2 
[mysqld]
log_bin=mysql-bin
server_id=20

2、编写主任务

[student@server mysql]$ cat tasks/main.yml 
---
# tasks file for mysql
- name: mount
  mount: 
    src: /dev/cdrom
    path: /mnt
    fstype: iso9660
    state: mounted

- name: clear repo
  shell: 
    cmd: rm -rf /etc/yum.repos.d/*

- name: set repo1
  yum_repository: 
    file: server
    name: aa
    description: aa1
    baseurl: file:///mnt/BaseOS
    enabled: yes
    gpgcheck: no

- name: set repo1
  yum_repository: 
    file: server1
    name: aa1
    description: aa11
    baseurl: file:///mnt/AppStream
    enabled: yes
    gpgcheck: no

- name: stop selinux
  lineinfile: 
    path: /etc/selinux/config
    regexp: '^SELINUX='
    line: SELINUX=disabled

- name: install mariadb
  yum: 
    name: 
      - mariadb-server
      - mariadb
    state: present


- name: cp config
  template: 
    src: master.cnf.j2     ——将定义好的模板覆盖掉数据库配置文件
    dest: /etc/my.cnf   
  when: inventory_hostname in {
   
   { groups.mysql_master }}  
    #匹配清单里的主机组中的mysql_master组的node1，如匹配成功则将主优先级赋予node1
		

- name: cp config2
  template: 
    src: slave.cnf.j2
    dest: /etc/my.cnf
  when: inventory_hostname in {
   
   { groups.mysql_slave }}    #同理

- name: start mariadb
  service: 
    name: mariadb
    state: restarted
    enabled: yes

- name: grant for root
  shell: 
    cmd: mysql -uroot -e "grant all privileges on *.* to root@'%' identified by 'redhat';"
                           #授予数据库root用户所有权限并设置密码
- name: master
  shell: 
    cmd: mysql -uroot -e "grant  replication slave on *.* to 'user'@'slave' identified by 'redhat';"
  when: inventory_hostname in {
   
   { groups.mysql_master }}        ——确保数据库使用的node1
							将主数据授予从数据库，并设置slave用户
- name: slave
  shell: 
    cmd: mysql -uroot -e "change  master to master_host='master',master_user='user',master_password='redhat';"
  when: inventory_hostname in {
   
   { groups.mysql_slave }}
                          #收到数据库数据后确定其是否连接主库，master_host表对应master
- name: start slave
  shell: 
    cmd: mysql -uroot -e "start slave;"
  when: inventory_hostname in {
   
   { groups.mysql_slave }}

3、测试运行结果

MariaDB [(none)]> show slave status\G;
*************************** 1. row ***************************
                Slave_IO_State: Connecting to master
                   Master_Host: master
                   Master_User: user
                   Master_Port: 3306
                 Connect_Retry: 60
               Master_Log_File: 
           Read_Master_Log_Pos: 4
                Relay_Log_File: node1-relay-bin.000001
                 Relay_Log_Pos: 4
         Relay_Master_Log_File: 
              Slave_IO_Running: Connecting
             Slave_SQL_Running: Yes