mysql,keepalived双机热备

环境

Centos 7.4

172.16.91.215 主

172.16.91.216 从

安装包版本

mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz

一两台机器上，都安装上mysql

把 mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz 上传到 /usr/local/src/

cd /usr/local/src/

tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz

mkdir -p /usr/local/mysql/

mv mysql-5.7.22-linux-glibc2.12-x86_64 /usr/local/mysql/mysql-5.7.22

创建 mysql 用户组和用户

cd /usr/local/src/

groupadd mysql

useradd -r -g mysql -s /bin/false mysql

chown -R mysql:mysql mysql

安装mysql

cd /usr/local/mysql/mysql-5.7.22

bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql/mysql-5.7.22/ --datadir=/usr/local/mysql/mysql-5.7.22/data --lc_messages_dir=/usr/local/mysql/mysql-5.7.22/share --lc_messages=en_US

注意，要记录最后生成的登录密码

修改配置

cd /usr/local/mysql/mysql-5.7.22

bin/mysql_ssl_rsa_setup --datadir=/usr/local/mysql/mysql-5.7.22/data

vi /etc/my.cnf

basedir=/usr/local/mysql/mysql-5.7.22

datadir=/usr/local/mysql/mysql-5.7.22/data/

配置环境变量

vim ~/.bash_profile

将mysql的bin目录配置到环境变量中

PATH=$PATH:$HOME/bin:/usr/local/mysql/mysql-5.7.22/bin

export PATH

source ~/.bash_profile

修改密码

mysql -uroot –p

set password=password("新密码");

配置远程访问

use mysql

update user set host='%' where user='root';

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '......' WITH GRANT OPTION;（或者是：grant all privileges on *.* to root@'%' identified by "你的新密码";）

FLUSH PRIVILEGES;

安全启动

./mysqld_safe --user=mysql &

安全关闭

./mysqladmin -uroot -p shutdown

二两台 mysql 配置双主

创建主从同步 replication用户

172.16.91.215

grant replication slave on *.* to 'replication'@'172.16.91.216' identified by 'replication';

flush privileges;

172.16.91.216

grant replication slave on *.* to 'replication'@'172.16.91.215' identified by

'replication';

flush privileges;

172.16.91.215

[mysqld]

datadir=/usr/local/mysql/mysql-5.7.22

datadir=/usr/local/mysql/mysql-5.7.22/data/





server-id = 215

log-bin = mysql-binlog

binlog-ignore-db = mysql

binlog-ignore-db=information_schema

binlog_do_db = guangzhou





# 主主需要加的部分

replicate-do-db = guangzhou

replicate-ignore-db=mysql,information_schema

log-slave-updates

sync_binlog=1

auto_increment_offset=1

auto_increment_increment=2







!includedir /etc/my.cnf.d

172.16.91.216

[mysqld]

basedir = /usr/local/mysql/mysql-5.7.22

datadir = /usr/local/mysql/mysql-5.7.22/data/



server-id = 216





replicate-do-db = guangzhou





#主-主需加入的部分

auto_increment_offset = 2

auto_increment_increment = 2

log-slave-updates

sync_binlog = 1

log_bin = mysql-binlog

binlog-ignore-db = mysql

binlog-ignore-db = information_schema

binlog_do_db = guangzhou

replicate-ignore-db = mysql,information_schema







!includedir /etc/my.cnf.d

重启两台 mysql 服务

进入 mysql cli

执行命令 show master status\G

分别记录主的 binlog 位置，在216的角度上 215 为主，在 215的角度上，216为主

Position: 682

设置同步关系(两个主都要设置)

stop  slave;

change master to

master_host='peer',

master_user='user',

master_password='password',

master_log_file='mysql-bin.000004',

master_log_pos=682;

其中 master_log_file 和 master_log_pos 要登录到对方机器

执行 show master status\G; 去查看

start slave

使用 show slave status\G; 验证

如果显示Slave_IO_State: Waiting for master to send event,就说明同步成功

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 172.16.91.216

Master_User: replication

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-binlog.000007

Read_Master_Log_Pos: 154

Relay_Log_File: 215-centos7-relay-bin.000016

Relay_Log_Pos: 373

Relay_Master_Log_File: mysql-binlog.000007

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Replicate_Do_DB: guangzhou

常见错误

当 show slave status\G; 不成功的时候，可能是 replication 账号权限问题，

解决问题把 replication 账号设置为所有主机都能访问

两台机器 都要 安装 keepalived

安装所需要的依赖包

yum install -y gcc;

yum install -y openssl-devel;

yum install -y libnl;

yum install -y libnl-devel;

yum install -y libnfnetlink-devel;

解压，并放到 /usr/local /, 并重命名为 keepalived

./configure --prefix=/usr/local/keepalived/ --sysconf /etc

cd /usr/local/keepalived/

make && make install

ln -s sbin/keepalived /sbin/

cd keepalived

cp etc/init.d/keepalived /etc/init.d/

chkconfig --add keepalived

chkconfig keepalived on

service keepalived start

215 机器上的 keepalived 配置

! Configuration File for keepalived

global_defs {

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER

interface ens160

virtual_router_id 51

priority 100

advert_int 1

track_script {

chk_nginx_service

}

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.91.101

}

virtual_server 172.16.91.101 3306 {

delay_loop 2

lb_algo rr

lb_kind NAT

persistence_timeout 50

protocol TCP

real_server 172.16.91.215 3306 {

notify_down /usr/local/keepalived/bin/mysql.sh

weight 1

TCP_CHECK {

connect_timeout 10

bingto 172.16.91.101

nb_get_retry 3

delay_before_retry 3

connect_port 3306

}

216 机器上的 keepalived 配置