基于MySQL 5.7多源复制及Keepalived搭建三节点高可用架构

wubx

发布于 2019-04-24 18:54:14

7140

发布于 2019-04-24 18:54:14

文章被收录于专栏：MySQLBeginner

导读

特别声明，这不是Group Replication 本内容摘自知数堂第35期公开课《MySQL 5.7 高可用新玩法》本次公开课视频请访问 http://pan.baidu.com/s/1mia6MZu 知数堂公开课相关视频请访问 https://ke.qq.com/course/172600 课中涉及到的脚本及配置文件请点击文末 “阅读原文”

基本环境准备

使用Centos 6.X 64位系统 MySQL 使用 MySQL-5.7.17-x86_64 版本，去官方下载mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz 版本

机器名	操作系统	Ip
node1	centos-6.8	192.168.11.100
node2	centos-6.8	192.168.11.101
node3	centos-6.8	192.168.11.102

三节点集群设置VIP为 192.168.11.110

一般我们建议关闭iptables

[wubx@zhishuedu.com ~]# chkconfig —del iptables
[wubx@zhishuedu.com ~]# /etc/init.d/iptables stop

并且关闭 selinux

[wubx@zhishuedu.com ~]# setenforce 0并且将配置文件 /etc/sysconfig/selinux 中的下面这行
SELINUX=permissive更改为SELINUX=disabled

下载MySQL

[wubx@zhishuedu.com ~]# mkdir /data/Soft
[wubx@zhishuedu.com ~]# cd /data/Soft
[wubx@zhishuedu.com ~]# wget -c https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.17-linux-glibc2.5-x86\_64.tar.gz

MySQL部署约定

二进制文件放置到 /opt/mysql/ 下面对应的目录。数据文件全部放置到 /data/mysql/ 下面对应的目录。原始二进制文件下载到 /data/Soft/ 目录下。

MySQL基本安装

以下安装步骤需要在node1, node2, node3上分别执行。

[wubx@zhishuedu.com ~]# mkdir /opt/mysql
[wubx@zhishuedu.com ~]# cd /opt/mysql
[wubx@zhishuedu.com ~]# tar zxvf /data/Soft/mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
[wubx@zhishuedu.com ~]# ln -s /opt/mysql/mysql-5.7.17-linux-glibc2.5-x86_64 /usr/local/mysql
[wubx@zhishuedu.com ~]# mkdir /data/mysql/mysql3309/{data,logs,tmp} -p
[wubx@zhishuedu.com ~]# groupadd mysql
[wubx@zhishuedu.com ~]# useradd -g mysql -s /sbin/nologin -d /usr/local/mysql -M mysql
[wubx@zhishuedu.com ~]# chown -R mysql:mysql /data/mysql/
[wubx@zhishuedu.com ~]# chown -R mysql:mysql /usr/local/mysql
[wubx@zhishuedu.com ~]# cd /usr/local/mysql/
[wubx@zhishuedu.com ~]# ./bin/mysqld —defaults-file=/data/mysql/mysql3309/my3309.cnf —initialize
[wubx@zhishuedu.com ~]# cat /data/mysql/mysql3309/data/error.log |grep password
[wubx@zhishuedu.com ~]# /usr/local/mysql/bin/mysqld —defaults-file=/data/mysql/mysql3309/my3309.cnf &
[wubx@zhishuedu.com ~]# echo “export PATH=$PATH:/usr/local/mysql/bin” >>/etc/profile
[wubx@zhishuedu.com ~]# source /etc/profile[wubx@zhishuedu.com ~]# mysql -S /tmp/mysql3309.sock -uroot -pXXmysql> grant replication slave,replication client on . to ‘repl’@’%’ identified by ‘repl4slave’;
mysql> grant all privilegs on test.* to ‘wubx’@’%’ identified by ‘wubx’;
mysql> reset master;

每个节点按上面进行，遇到初始化和启动故障请认真阅读 error log 日志文件。

搭建主从结构

node1上设置master

mysql> change master to master_host=’192.168.11.101’,
master_port=3309, master_user=’repl’, 
master_password=’repl4slave’, master_auto_position=1 
for channel ‘192_168_11_101_3309’;mysql> change master to master_host=’192.168.11.102’,
master_port=3309, master_user=’repl’, 
master_password=’repl4slave’, master_auto_position=1 
for channel ‘192_168_11_102_3309’;#确认同步OK
mysql> start slave;
mysql> show slave status\G

node2上设置master

mysql> change master to master_host=’192.168.11.100’,
master_port=3309, master_user=’repl’, 
master_password=’repl4slave’, master_auto_position=1 
for channel ‘192_168_11_100_3309’;mysql> change master to master_host=’192.168.11.102’,
master_port=3309,master_user=’repl’, 
master_password=’repl4slave’,master_auto_position=1 
for channel ‘192_168_11_102_3309’;#确认同步OK
mysql> start slave;
mysql> show slave status\G

node3上设置master

mysql> change master to master_host=’192.168.11.100’,
master_port=3309, master_user=’repl’, 
master_password=’repl4slave’, master_auto_position=1 
for channel ‘192_168_11_100_3309’;mysql> change master to master_host=’192.168.11.101’,
master_port=3309, master_user=’repl’, 
master_password=’repl4slave’,master_auto_position=1 
for channel ‘192_168_11_101_3309’;#确认同步OK
mysql> start slave;
mysql> show slave status\G

安装keepalived

node1， node2， node3 上分别安装keepalived。

yum install keepalivled

安装python依赖模块。

yum install MySQL-python.x86_64 yum install python2-filelock.noarch

keepalived配置配置文件放置在 /etc/keepalived/keepalived.conf，内容如下

vrrp_script vs_mysql_82 {   script "/etc/keepalived/checkMySQL.py -h 127.0.0.1 -P 3309"   interval 15}vrrp_instance VI_82 {   state backup   nopreempt   interface eth1   virtual_router_id 82   priority 100   advert_int 5   authentication {       auth_type PASS       auth_pass 1111   }   track_script {       vs_mysql_82   }   notify /etc/keepalived/notify.py   virtual_ipaddress {       192.168.11.110   }}

在node1, node2, node3分别执行下面命令，启动keepalived。