MySQL-主從複製

實驗環境

MySQL-master:192.168.200.111

MySQL-slave1:192.168.200.112

MySQL-slave2:192.168.200.113

[root@localhost ~]# iptables -F
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setenforce 0

創建時間同步環境，在主服務器上安裝配置NTP時間同步服務器

[root@localhost ~]# yum -y install ntp

[root@localhost ~]# vim /etc/ntp.conf

末行添加

server 127.127.1.0

fudge 127.127.1.0 startum 8

[root@localhost ~]# systemctl restart ntpd

在從服務器上同步時間

[root@localhost ~]# yum -y install ntpdate

[root@localhost ~]# ntpdate 192.168.200.111
15 Oct 12:02:12 ntpdate[10406]: adjust time server 192.168.200.111 offset 0.008413 sec

slave2服務器與slave1服務器相同

配置MySQL Master主服務器

[root@localhost mysql]# vim /etc/my.cnf

[mysqld]

server-id=1                      //三臺不要相同
log-bin=mysql-bin
log-slave-updates=true   //手動添加，開啓從日誌

[root@localhost ~]# systemctl restart mariadb

給從服務器受權

[root@localhost ~]# mysql -uroot -p123456

MariaDB [(none)]> grant replication slave on *.* to 'root'@'192.168.200.%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000010 | 474 |                 |                        |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

以前主服務器有數據須要先傳給從服務器

主：mysqldump -uroot -all-databases > /root/alldbacup.sql

scp傳給從服務器

從：mysql -uroot -p <  /root/alldbacup.sql

配置從服務器

[root@localhost ~]# vim /etc/my.cnf

[mysqld]

server-id=2                                               //id號不能相同
relay-log=relay-log-bin
relay-log-index=slave-relay-bin.index 

[root@localhost ~]# systemctl restart mariadb

[root@localhost ~]# mysql -uroot -p123456

MariaDB [(none)]> stop slave;
Query OK, 0 rows affected, 1 warning (0.01 sec)

MariaDB [(none)]> change master to
-> master_host='192.168.200.111',
-> master_user='root',
-> master_password='123456',
-> master_log_file='mysql-bin.000010',
-> master_log_pos=474;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.200.111
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000010
Read_Master_Log_Pos: 474
Relay_Log_File: relay-log-bin.000002
Relay_Log_Pos: 529
Relay_Master_Log_File: mysql-bin.000010
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

........................................

經過查看slave狀態，確保Slave_IO_Running: Yes      Slave_SQL_Running: Yes

slave2配置相同

在主服務器建立數據庫，在從服務器查看是否同步

主：

MariaDB [(none)]> create database db_test;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema   |
| db_test 　　　　　　 |
| mysql　　　　　　　 |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)

從：

MariaDB [(none)]> show databases;+--------------------+| Database |+--------------------+| information_schema   || db_test　　　　　　  || mysql　　　　　　　 || performance_schema || test |+--------------------+5 rows in set (0.00 sec)