使用ansible搭建mysql主从复制

系统配置：centos7

　　　　    mysql5.7

                  ansible 2.9.1

1、安装ansible

yum install epel-release-y

yum install ansible

2、编写inventory文件  hosts.ini

[mysql_servers]
192.168.235.145 ansible_ssh_user="root" ansible_ssh_pass="xxxxxxx" mysql_role=master  server_id=1
192.168.235.146 ansible_ssh_user="root" ansible_ssh_pass="xxxxxxx" mysql_role=slave  server_id=2
192.168.235.147 ansible_ssh_user="root" ansible_ssh_pass="xxxxxxx" mysql_role=slave  server_id=3

[mysql_servers:vars]
master_ip=192.168.235.145
mysql_version=5.7.28

mysql_root_password=sy#M*tFE(11O
mysqld_error_log=/var/log/mysqld.log
mysql_repl_user=repl
mysql_repl_password=repl

3、编写tasks任务文件  main.yml

---
- name: stop firewalld
  shell: systemctl stop firewalld

　register: command_result

  failed_when: "'FAILED' in command_result.stderr"

- name: disable firewalld
  shell: systemctl disable firewalld

  register: command_result
  failed_when: "'FAILED' in command_result.stderr"

- name: install repository
  yum :
    name: https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
    state: present

- name: copy global my.cnf
  template:
    src: templates/my.cnf.j2
    dest: /etc/my.cnf

- name: install mysql '{{ mysql_version  }}'
  yum:
    name: 'mysql-community-server-{{ mysql_version }}'
    state: present
    enablerepo: mysql57-community
    disablerepo: mysql80-community

- name: start mysql
  service:
      name: mysqld
      state: started

- name: Find temporary password
  shell: >
    echo `grep 'temporary.*root@localhost' "{{ mysqld_error_log  }}" | sed 's/.*root@localhost: //'`
  register: mysql_root_password_temp

- name: Set new password for mysql root user
  shell: >
      mysql -NBe "alter user USER() identified by '{{ mysql_root_password }}';"
      --connect-expired-password -uroot -p'{{ mysql_root_password_temp.stdout }}'

- name: uninstall validate_password plugin
  shell: >
      mysql -NBe "uninstall plugin validate_password" -uroot -p'{{ mysql_root_password  }}'

- name: install MySQL-python
  yum:
      name: MySQL-python
      state: latest

- name: create replication user
  mysql_user:
    name: "{{ mysql_repl_user }}"
    host: "%"
    password: "{{ mysql_repl_password }}"
    priv: "*.*:REPLICATION SLAVE"
    state: present
    login_user: root
    login_password: "{{ mysql_root_password }}"
  when: mysql_role == "master"
  tags:
    - create-repl-user

- name: change master to
  mysql_replication:
     mode: changemaster
     master_host: "{{ master_ip }}"
     master_user: repl
     master_password: repl
     master_auto_position: yes
     login_user: root
     login_password: "{{ mysql_root_password }}"
  when: mysql_role == 'slave'

- name: start slave
  mysql_replication:
     mode: startslave
     login_user: root
     login_password: "{{ mysql_root_password }}"
  when: mysql_role == "slave"

4、mysql配置文件模板 my.cnf.j2

[mysqld]

datadir = /var/lib/mysql
socket=/var/lib/mysql/mysql.sock

symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

log-bin=/var/lib/mysql/mysql-bin
server-id = {{ server_id }}

character_set_server='utf8'
skip-name-resolve


## InnoDB specific parameters
innodb_buffer_pool_size = 2G
innodb_file_per_table=ON
innodb_flush_log_at_trx_commit=1
innodb_log_file_size=128M
innodb_flush_method=O_DIRECT

## Transaction behavior
autocommit=ON
transaction-isolation=READ-COMMITTED


#slow_query
log_queries_not_using_indexes=1
long_query_time=1
slow_query_log=1


## Memory sizes
join_buffer_size     = 8M
sort_buffer_size     = 8M
read_rnd_buffer_size = 16M

tmp_table_size       = 128M
max_heap_table_size  = 128M


## Miscellaneous parameters
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER
default_storage_engine=InnoDB


# max binlog keeps days
expire_logs_days = 7

max_connections=300
log_timestamps=system
slave_net_timeout=3600
## Enables binary logging
max_relay_log_size=512M
binlog_format=ROW
max_binlog_size=512M
master_info_repository = table
relay_log_info_repository = table
sync_binlog=0
gtid_mode=ON
log_slave_updates=ON
enforce_gtid_consistency=ON
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
loose_rpl_semi_sync_master_enabled = 1
loose_rpl_semi_sync_slave_enabled = 1
loose_rpl_semi_sync_master_timeout = 5000
## Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

{% if mysql_role == "slave" %}
read_only=ON
{% endif %}

执行：

ansible-playbook -i hosts.ini start_deploy.yml

完整代码链接：

https://github.com/chaofan1/ansible_mysql_master_slave