MySQL高可用架构之Galera Cluster

MySQL高可用架构之Galera Cluster

1、实验准备及拓扑

至少需要三个节点

node1 192.168.150.137node2 192.168.150.138node3 192.168.150.139

mariadb版本为mariadb的支持galera cluster的分支版本

MariaDB-Galera-server-5.5.46

实验前准备：

1、HA环境首要条件：时间同步三个节点添加对时脚本[root@localhost ~]# crontab -l*/5 * * * * /usr/sbin/ntpdate 1.cn.pool.ntp.org2、三个几点均配置MariaDB-Galera的本地yum仓库，我尝试使用mariadb官方提供的yum仓库，天朝的网会气死你[root@localhost ~]# cat /etc/yum.repos.d/galera.repo [galera]name=galerabaseurl=file:///root/galera_clustergpgcheck=0enable=13、yum安装，仅需安装MariaDB-Galera-server，其余的均会依赖安装yum -y install Mariadb-Galera-server

2、配置

1、查看galera所需调用的库的位置rpm -ql galera | grep -i smm.so/usr/lib64/galera/libgalera_smm.so2、修改配置文件，三节点同步修改[root@localhost yum.repos.d]# cat /etc/my.cnf.d/server.cnf## These groups are read by MariaDB server.# Use it for options that only the server (but not clients) should see## See the examples of server my.cnf files in /usr/share/mysql/## this is read by the standalone daemon and embedded servers[server]# this is only for the mysqld standalone daemon[mysqld]## * Galera-related settings#[galera]# Mandatory settingswsrep_provider=/usr/lib64/galera/libgalera_smm.so wsrep_cluster_address="gcomm://192.168.150.137,192.168.150.138,192.168.150.139"binlog_format=rowdefault_storage_engine=InnoDBinnodb_autoinc_lock_mode=2bind-address=0.0.0.0wsrep_cluster_name='mycluster'## Optional setting#wsrep_slave_threads=1#innodb_flush_log_at_trx_commit=0# this is only for embedded server[embedded]# This group is only read by MariaDB-5.5 servers.# If you use the same .cnf file for MariaDB of different versions,# use this group for options that older servers don't understand[mysqld-5.5]# These two groups are only read by MariaDB servers, not by MySQL.# If you use the same .cnf file for MySQL and MariaDB,# you can put MariaDB-only options here[mariadb][mariadb-5.5]3、节点1进行mysql及cluster开启[root@localhost ~]# /etc/rc.d/init.d/mysql start --wsrep-new-cluster    Starting MySQL.... SUCCESS! 4、其它两个节点进行正常的mysql开启[root@localhost ~]# service mysql startStarting MySQL....SST in progress, setting sleep higher. SUCCESS! 此时已配置完成。。。。。。

3、功能验证

1、节点1创建数据库，节点2 3均可正常查看节点1：[root@localhost ~]# mysqlWelcome to the MariaDB monitor.  Commands end with ; or \g.Your MariaDB connection id is 4Server version: 5.5.46-MariaDB-wsrep MariaDB Server, wsrep_25.12.r4f81026Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]> CREATE DATABASE mydb;Query OK, 1 row affected (0.00 sec)MariaDB [(none)]> SHOW DATABASES;+--------------------+| Database           |+--------------------+| information_schema || mydb               || mysql              || performance_schema || test               |+--------------------+节点2 3：[root@localhost ~]# mysqlWelcome to the MariaDB monitor.  Commands end with ; or \g.Your MariaDB connection id is 4Server version: 5.5.46-MariaDB-wsrep MariaDB Server, wsrep_25.12.r4f81026Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]> SHOW DATABASES;+--------------------+| Database           |+--------------------+| information_schema || mydb               || mysql              || performance_schema || test               |+--------------------+5 rows in set (0.01 sec)2、节点2数据库中创建表，节点1 2均可正常查看节点2：MariaDB [(none)]> use mydb;Database changedMariaDB [mydb]> CREATE TABLE tb1 (id int,name char(10));Query OK, 0 rows affected (0.01 sec)节点1 3：MariaDB [(none)]> use mydbReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -ADatabase changedMariaDB [mydb]> SHOW TABLES    -> ;+----------------+| Tables_in_mydb |+----------------+| tb1            |+----------------+1 row in set (0.00 sec)MariaDB [mydb]> DESC tb1;+-------+----------+------+-----+---------+-------+| Field | Type     | Null | Key | Default | Extra |+-------+----------+------+-----+---------+-------+| id    | int(11)  | YES  |     | NULL    |       || name  | char(10) | YES  |     | NULL    |       |+-------+----------+------+-----+---------+-------+2 rows in set (0.02 sec)3、自增栏位的测试，每个几点会跳着进行自增，同时插入时例如1节点1 4 7；2节点2 5 8；三节点3 6 9。节点1：MariaDB [mydb]> CREATE TABLE tb2(id int UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,name char(30)uery OK, 0 rows affected (0.01 sec)MariaDB [mydb]> INSERT INTO tb2 (name) VALUES ('void'),('yao');Query OK, 2 rows affected (0.01 sec)Records: 2  Duplicates: 0  Warnings: 0节点2：MariaDB [mydb]> select * from tb2;+----+------+| id | name |+----+------+|  1 | void ||  4 | yao  |+----+------+2 rows in set (0.01 sec)MariaDB [mydb]> INSERT INTO tb2 (name) VALUES ('amy'),('apple');Query OK, 2 rows affected (0.00 sec)Records: 2  Duplicates: 0  Warnings: 0MariaDB [mydb]> select * from tb2;+----+-------+| id | name  |+----+-------+|  1 | void  ||  4 | yao   ||  5 | amy   ||  8 | apple |+----+-------+4 rows in set (0.00 sec)