Content Highlights:
First, why should master-slave replication?
Two, Mysql replication master from type:
Third, the master copy of the work process:
Fourth, case presentations
First, why should master-slave replication?
In the corporate Web site, if the backend as long as a Mysql server, it will cause, such as a single point of failure, unable to handle a large number of concurrent data requests and data loss and other issues.
Therefore, it reflects the importance of the Mysql master-slave replication:
Mysql a master server, a plurality of backup data from the service master and slave;
Mysql standby database server to ensure data is the same;
The primary server goes down, the backup server can still continue to work, the data is guaranteed.
Two, Mysql replication master from type:
(1) Based on the statement of the copy (the default):
Statements executed on the primary server, execute the same statement from the server.
(2) row-based replication:
Copy the contents of the change from the server.
(3) mixed types of replication:
Once found based on statements can not be precisely replicated, it will take based replication lines.
Third, the master copy of the work process:
Preparing the environment:
Two virtual machines, build a good Mysql services;
A server call the shots, the other one to do from the server;
Experimental results: statements that are executed on the primary server, execute the same statement from the server will be.
| Master server (master) | IP address: 192.168.220.141 |
| From the server (slave) | IP address: 192.168.220.140 |
Step 1: Set time synchronization
1, the primary server:
(1) Installation time server:
yum install ntp -y
(2) modify the configuration file:
vim /etc/ntp.conf server 127.127.220.0 // clock source is local fudge 127.127.220.0 stratum 8 // set time to level 8
(3) to restart the service, and turn off the firewall, etc.
systemctl start ntpd // open the Time Synchronization Service systemctl stop firewalld // turn off the firewall setenforce 0
2, from the server:
(1) Installation time server:
yum install ntp ntpdate -y
(2) open service, turn off the firewall:
systemctl start ntpd systemctl stop firewalld setenforce 0
（3）进行时间同步：
/usr/sbin/ntpdate 192.168.220.141
第二步：主服务器配置
1、修改配置文件：
vim /etc/my.cnf server-id = 11 //指定id号，服务器的唯一标识 log-bin=master-bin //主服务器日志文件 log-slave-updates=true //从服务器更新二进制日志
2、重启服务：
systemctl restart mysqld.service
3、进入数据库：
mysql -uroot -p //进入数据库 GRANT REPLICATION SLAVE ON *.* TO 'myslave'@'192.168.220.%' IDENTIFIED BY '123456'; FLUSH PRIVILEGES; //刷新MySQL的系统权限相关表 show master status; //查看主服务器状态
第三步：从服务器配置
1、修改配置文件：
vim /etc/my.cnf server-id = 22 //指定id号，服务器的唯一标识 relay-log=relay-log-bin //从主服务器上同步日志文件记录到本地 relay-log-index=slave-relay-bin.index //定义relay-log的位置和名称
2、重启mysql服务：
systemctl restart mysqld.service
3、进入数据库：
mysql -uroot -p change master to master_host='192.168.220.141',master_user='myslave',master_password='123456',master_log_file='master-bin.000001',master_log_pos=604; start slave; show slave status \ G; // check the status of
Step four: Test the master-slave synchronization
1. Create a database named school on the first primary server:
create database school;
2, viewing from the database server about whether there are school library:
From the master to complete the configuration synchronization.