准备工作

主机信息

安装ansible

Ansible 是一个自动化运维管理的工具， 可以支持同时管理多台节点，ansible playbook 支持 编写 yml 格式的配置，来管理多个主机节点。

ansible软件 不需要每个节点都安装， 只需要指定其中一个节点作为管理节点即可，在此示例中，我们选择 node1 作为我们的管理节点来安装ansible

自动化安装脚本

• 脚本安装ansible

• 脚本配置免密登录

  配置免密登录 首先需要每个服务器的密码， 这里我们三个主机的密码 统一设置成相同密码 配置在文件 ssh_password中

• 解析 config.ini

配置文件 config.ini

[ssh_password]
halou

[mysql]
192.168.114.133 master
192.168.114.134 slave
192.168.114.135 slave

脚本 auto_install_ansible.sh

#!/bin/bash

#auto insall ansible
#自动化安装ansible软件


CUR_PATH=$(readlink -f $(dirname $0))

#打印日志
function result_echo
{
    if [ $? -eq 0 ]; then 
        echo "$1" | tee -a $CUR_PATH/log.log
    else
        echo "$2" | tee -a $CUR_PATH/log.log
        exit 1
    fi
}

HOST_LIST=`sed -n '/\[mysql\]/,/\[.*\]/p' ./config.ini | grep -v "\[.*\]" | grep -v ^$ | grep -v ^# | awk '{print $1}'`
SSH_PASSWORD=`sed -n '/\[ssh_password\]/,/\[.*\]/p' ./config.ini | grep -v "\[.*\]" | grep -v ^$ | grep -v ^# `

yum repolist | grep epel &> /dev/null

if [ $? -ne 0 ];then
    yum install epel-release -y
    yum makecache
fi

yum install sshpass ansible -y

#生成秘钥，并发送给各个节点执行
echo -e "y\n" | ssh-keygen -t rsa -q -N "" -f ~/.ssh/id_rsa


for host in $HOST_LIST;do
    sshpass -p$SSH_PASSWORD ssh-copy-id -o StrictHostKeyChecking=no root@$host &> /dev/null
    ssh -o StrictHostKeyChecking=no root@$host 'ls -al' &> /dev/null

    result_echo "Ok... No password login is success" "Failed...Use no password login failed, please check！！！"
    
done	

安装 mariadb

使用ansible-playbook 编写安装脚本 yaml

注意事项

• 自定义主机操作列表 hosts 文件

  [mariadb_hosts]
  192.168.114.133 server_id='1' mysql_role=master
  192.168.114.134 server_id='2' mysql_role=salve
  192.168.114.135 server_id='3' mysql_role=salve
  

• 定义需要应用的变量，位置 根目录/group_vars/all.yml

  MYSQL_DATA_DIR: /www/mysql/data_dir
  MASTER_IP:  192.168.114.133
  

• 安装脚本主题 auto_install_mariadb.yml

  - hosts: mariadb_hosts
  
    tasks:
      - name: "if repo list exists"
        shell: "yum repolist | grep epel &> /dev/null"
        register: repolist_result
        failed_when: false
        when: mysql_role == "master"
  
      - name: "install epel_release"
        shell: " yum install epel-release -y"
        when: 
          - mysql_role == "master"
          - repolist_result.rc != 0
         
  
      - name: "stop firewalld"
        shell: systemctl stop firewalld && systemctl disable firewalld
      
      - name: setenforce zero
        shell: getenforce | grep Disabled &> /dev/null || setenforce 0
      
      - name: stop SeLinux
        lineinfile: path=/etc/sysconfig/selinux regexp="^SELINUX=" line="SELINUX=disabled"
  
      - name: delete data dir if exists
        shell: "rm -rf {{ MYSQL_DATA_DIR }}"
      
      - name: mkdir data dir
        shell: "[[ -d {{ MYSQL_DATA_DIR }} ]] || mkdir -p {{ MYSQL_DATA_DIR }}"
  
      - name: yum install mariadb
        shell: yum install mariadb mariadb-server -y
  
      - name: set datadir
        lineinfile: path=/etc/my.cnf regexp="^datadir" line="datadir={{ MYSQL_DATA_DIR }}" insertafter="\[mysqld\]"
  
      - name: server_id
        lineinfile: path=/etc/my.cnf line="server_id={{ server_id }}" insertafter="\[mysqld\]"
      
      - name: set master 
        lineinfile: path=/etc/my.cnf regexp="^log-bin" line="log-bin=master-bin" insertafter="^\[mysqld\]"
        when: mysql_role == "master"
      - name: set slave
        lineinfile: path=/etc/my.cnf line="relay-log=slave-log" insertafter="^\[mysqld\]"
        when: mysql_role == "salve"
  
      - name: chown mysql dir
        shell: chown -R mysql:mysql {{ MYSQL_DATA_DIR }} 
  
      - name: restart mariadb
        shell: systemctl restart mariadb
  
      - name: grant slave user
        shell: mysql -e "GRANT REPLICATION SLAVE ON *.* TO 'slave_user'@'%' IDENTIFIED BY 'demo_pass'"
        when: mysql_role == "master"
  
      - name: master bin log name
        shell: "mysql -e \"show master status\\G;\" | grep File | awk -F: '{print $2}' | awk '{gsub(/^\\s+|\\s+$/, \"\");print}' > ~/master_name"
        when: mysql_role == "master"
  
      - name: master bin position
        shell: "mysql -e \"show master status\\G;\" | grep Position | awk -F: {'print $2'} | awk '{gsub(/^\\s+|\\s+$/, \"\");print}' > ~/postion_name"
        
        when: mysql_role == "master"
  
      - name: copy master name
        ansible.builtin.copy:
          src: ~/master_name
          dest: ~/master_name
      - name: copy postion
        ansible.builtin.copy:
          src: ~/postion_name
          dest: ~/postion_name
  
      - name: cat master name
        shell: cat ~/master_name
        register: master_name
  
      - name: cat postion 
        shell: cat ~/postion_name
        register: master_postion
  
      - name: reset slave
        shell: mysql -e "reset slave "
        when: mysql_role == "salve"
      
      - name: change master
        shell: mysql -e "CHANGE MASTER TO master_host='{{ MASTER_IP }}', master_user='slave_user', master_password='demo_pass', master_log_file='{{ master_name.stdout }}',master_log_pos={{ master_postion.stdout }} "
        when: mysql_role == "salve"
       
      
      - name: start slave
        shell: mysql -e "start slave "
        when: mysql_role == "salve"
  

参考资料:

https://github.com/ansible/ansible-examples/blob/master/mongodb/playbooks/testsharding.yml 【ansible 安装mongodb示例】

https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html 【ansible 变量引用】

https://www.cnblogs.com/haloujava/p/16561883.html 【一键安装Mysql并配置主从复制】