Galera Cluster高可用方案實驗

三臺linux
1、配置yum源

[root@localhost ~]# vim /etc/yum.repos.d/galera.repo
[mysql]
baseurl=https://mirrors.tuna.tsinghua.edu.cn/mariadb/mariadb-5.5.64/yum/centos7-amd64/
gpgcheck=0
enabled=1

2、安裝軟件

所有要實現galera的都需要安裝，MariaDB-Galera-server會自動把mariadb-server替換掉
[root@localhost ~]# yum -y install MariaDB-Galera-server

3、配置文件

[root@localhost ~]# vim /etc/my.cnf.d/server.cnf
[galera]
wsrep_provider=/usr/lib64/galera/libgalera_smm.so       #庫文件路徑
wsrep_cluster_address="gcomm://192.168.2.6,192.168.2.16,192.168.2.16"      #gcomm協議，集羣主機
binlog_format=row

4、同步配置文件

[root@localhost ~]# scp /etc/my.cnf.d/server.cnf 192.168.2.16:/etc/my.cnf.d/
[root@localhost ~]# scp /etc/my.cnf.d/server.cnf 192.168.2.26:/etc/my.cnf.d/

5、首次啓動，需要初始化集羣，在其中一個節點上執行，然後再正常啓動其他節點

[root@localhost ~]# service mysql start --wsrep-new-cluster     #（腳本啓動方法）
Starting MariaDB.190509 23:16:39 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
190509 23:16:39 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
.... SUCCESS! 

[root@localhost ~]# service mysql start
Starting MariaDB.190509 23:18:37 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
190509 23:18:37 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
....SST in progress, setting sleep higher.. SUCCESS! 

root@localhost ~]# service mysql start
Starting MariaDB.190509 23:19:07 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
190509 23:19:07 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
...SST in progress, setting sleep higher. SUCCESS! 

6、一臺機器執行安全腳本（會同步部分數據庫信息）

[root@localhost ~]# mysql_secure_installation 

7、測試同步

主機1：
MariaDB [(none)]> create database db1;
主機2：
MariaDB [(none)]> show databases;
主機3：
MariaDB [(none)]> show databases;

主機2：
MariaDB [(none)]> create database db1;
ERROR 1007 (HY000): Can't create database 'db1'; database exists

主機3：
MariaDB [(none)]> create database db1;
ERROR 1007 (HY000): Can't create database 'db1'; database exists

測試成功

8、查看集羣中相關係統變量和狀態變量

MariaDB [(none)]> show variables like 'wsrep_%'\G;
MariaDB [(none)]> show status like 'wsrep_%';
MariaDB [(none)]> show status like 'wsrep_cluster_size';