MySql 5.7安装及配置主从

1.数据库安装（/home/mysql）

解压mysql-5.7.25-el7-x86_64.tar.gz（请自主下载,解压可用版本） 上传并解压数据库压缩包到/home/mysql

$ tar -zxvf mysql-5.7.25-el7-x86_64.tar.gz  
$ mv mysql-5.7.25-el7-x86_64 mysql  
$ groupadd mysql  
$ useradd -r -g mysql mysql -d /home/mysql  
$ chown -R mysql.mysql /home/mysql  
$ ./bin/mysqld --initialize --user=mysql --basedir=/home/mysql/  --datadir=/home/mysql/data #记录下密码 记录下密码 记录下密码 如ewe6h<S;Ur4y
(备注：若缺少libnuma.so.1，则执行yum install -y numactl)  
$ cp -a ./support-files/mysql.server /etc/init.d/mysqld
$ chmod +x /etc/init.d/mysqld
$ chkconfig --add mysqld
$ cp /etc/my.cnf /etc/my.cnf_bak #备份
拷贝my.cnf到/etc/my.cnf覆盖，修改配置(此处为我自己用的my.cnf，其他人请根据业务自主配置)
$ ln -s /home/mysql/bin/mysql /usr/bin
---------命令---------
$ service mysqld start
$ service mysqld status
$ service mysqld stop
$ service mysqld restart
----------------------
$ mysql -u root -p
 SET PASSWORD FOR 'root'@localhost=PASSWORD('密码');
 GRANT ALL PRIVILEGES ON *.* TO '用户名'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION; #远程连接
 flush privileges;
 SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;  

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2.mysql主从配置

1）主配置

$ vim /etc/my.cnf  #下面参数换行并且不能有空格
binlog-do-db=pomc
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema
binlog-ignore-db=sys
expire_logs_days=90

进数据库执行,创建mysql从库同步用户

$ mysql -u root -p
grant replication slave on *.* to '主从用户名'@'%' identified by '密码'; #主从备份用户
flush privileges;
$ service mysqld restart
----
show master status; #在主库执行，查看同步参数master_log_file，master_log_pos

2）从库配置

$ vim /etc/my.cnf  #下面参数换行并且不能有空格
replicate-do-db=pomc
replicate-ignore-db=mysql
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema
replicate-ignore-db=sys
master_info_repository=TABLE
relay_log_info_repository=TABLE

进数据库执行,填写主库信息

$ mysql -u root -p
change master to master_host='主服务器IP', master_port=端口, master_user='主服务器主从用户', master_password='密码', master_log_file='主库的binlog日志文件mysql-bin.000004', master_log_pos=主库的binlog日志文件位置如458;
flush privileges;
start slave;

show slave status\G; #查看是否成功，2个Running为Yes才成功，
-------从库不成功执行------
stop slave;
set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
start slave;
show slave status\G;
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来源：https://www.cnblogs.com/virtulreal/p/11803943.html