实验环境 三台虚拟机 一主两从
主: 192.168.200.111
从1: 192.168.200.112
从2: 192.168.200.113
[root@localhost ~]# iptables -F
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setenforce 0
建立三台服务器时间同步环境，在主服务器上安装配置NTP时间同步服务器
[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
在两台从服务器上同步时间
[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服务器与slave1服务器相同
在所有的服务器上操作安装mariadb和mariadb-server
[root@localhost ~]# yum -y install mariadb mariadb-server
配置MysqL Master主服务器
[root@localhost MysqL]# vim /etc/my.cnf
[MysqLd]
server-id=1 //三台不要相同
log-bin=MysqL-bin
log-slave-updates=true //手动添加，开启从日志
[root@localhost ~]# systemctl restart mariadb
给从服务器授权
[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 | | | //数据后面要用到
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
备份之前主服务器有数据需要先传给从服务器，没有就忽略。
主：MysqLdump -uroot -all-databases > /root/alldbacup.sql
scp传给从服务器
从：MysqL -uroot -p < /root/alldbacup.sql
配置从服务器
[root@localhost ~]# vim /etc/my.cnf
[MysqLd]
server-id=2 //id号不能相同
relay-log=relay-log-bin //开启中继日志
relay-log-index=slave-relay-bin.index
[root@localhost ~]# systemctl restart mariadb
[root@localhost ~]# MysqL -uroot -p123456
MariaDB [(none)]> stop slave; //把自己从的角色功能先停掉
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
........................................
通过查看slave状态，确保Slave_IO_Running: Yes Slave_sql_Running: Yes
slave2配置相同
测试：
在主服务器创建数据库，在从服务器查看是否同步
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)
从：
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| db_test |
| MysqL |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
