mysql group replication集群搭建
注： Limitations--------mysql5.7.17 group relication限制
1.存储引擎必须为innodb
2.每个表必须提供主键
3.只支持ipv4，网络需求较高
4.一个group最多只能有9台服务器
5.不支持Replication event checksums，
6.不支持Savepoints
7.multi-primary mode部署方式不支持SERIALIZABLE事务隔离级别
8.multi-primary mode部署方式不能完全支持级联外键约束
9.multi-primary mode部署方式不支持在不同节点上对同一个数据库对象并发执行DDL(在 不同节点上对同一行并发进行RW事务，后发起的事务会失败)
详细参考英文文档:
http://mysqlhighavailability.com/mysqlha/gr/doc/limitations.html#requirements
http://mysqlhighavailability.com/mysqlha/gr/doc/limitations.html#limitations
搭建步骤:
1、mysql5.7.17官网下载地址:
http://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
2、安装mysql5.7.17数据库:
./bin/mysqld --no-defaults --user=mysql --initialize --explicit_defaults_for_timestamp --basedir=/usr/local/mysql5.7/ --datadir=/usr/local/mysql5.7/data
--no-defaults:不从选项文件读取默认选项
--initialize:初始化
--explicit_defaults_for_timestamp:时间戳问题（不加这个参数安装会有提醒）
3、server1(192.168.1.231):
my3308.cnf文件:
[mysqld]
#base config 基础配置信息
server-id = 1
basedir=/usr/local/mysql5.7/
datadir=/usr/local/mysql5.7/data
user=mysql
explicit_defaults_for_timestamp
socket=/tmp/mysql3308.sock
port = 3308
#binlog binlog配置，Group Replication是要根据GTID来进行同步的，所以需要开启GTID
log-bin=mysql-bin
binlog-format = ROW
gtid-mode = ON
enforce-gtid-consistency = ON
log-slave-updates = ON
master-info-repository = TABLE
relay-log-info-repository = TABLE
binlog-checksum = NONE
#group replication
transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
loose-group_replication_start_on_boot=off
loose-group_replication_local_address= "192.168.1.231:24901"
loose-group_replication_group_seeds= "192.168.1.231:24901,192.168.1.232:24901,192.168.1.233:24901"
loose-group_replication_bootstrap_group= off
loose-group_replication_single_primary_mode=FALSE ###本次搭建的是mutil_mode
loose-group_replication_enforce_update_everywhere_checks= TRUE
启动mysql5.7: ./bin/mysqld_safe --defaults-file=/etc/my3308.cnf --user=mysql &
修改登录密码: ./bin/mysqladmin -S /tmp/mysql3308.sock -u root -p password
进入mysql创建授权用户:
>SET SQL_LOG_BIN=0; ###创建授权用户不写入bin_log
>CREATE USER rpl_user@'%';
>GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'rpl_pass'; #创建授权用户
>FLUSH PRIVILEGES;
>SET SQL_LOG_BIN=1;
>CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='rpl_pass' FOR CHANNEL 'group_replication_recovery';
安装mysql group replication:
> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
>SHOW PLUGINS; ###查看group_replication插件安装情况,需要存在下面项
启动mysql group replication:
>SET GLOBAL group_replication_bootstrap_group=ON; ###第一台server启动需要设置，重启也一样，详细见英文文档
>START GROUP_REPLICATION; ###启动
>SET GLOBAL group_replication_bootstrap_group=OFF; ###启动后关闭
>SELECT * FROM performance_schema.replication_group_members; ###查看group在线机器
创建测试数据库：
> CREATE DATABASE test;
> use test
> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 TEXT NOT NULL);
> INSERT INTO t1 VALUES (1, 'Luis');
>SHOW BINLOG EVENTS; ###查看binlog事件
详细解析参考英文文档:
http://mysqlhighavailability.com/mysqlha/gr/doc/getting_started.html
4、server2(192.168.1.232):
my3308.cnf文件:
[mysqld]
#base config 基础配置信息
server-id = 2
basedir=/usr/local/mysql5.7/
datadir=/usr/local/mysql5.7/data
user=mysql
explicit_defaults_for_timestamp
socket=/tmp/mysql3308.sock
port = 3308
#binlog binlog配置，Group Replication是要根据GTID来进行同步的，所以需要开启GTID
log-bin=mysql-bin
binlog-format = ROW
gtid-mode = ON
enforce-gtid-consistency = ON
log-slave-updates = ON
master-info-repository = TABLE
relay-log-info-repository = TABLE
binlog-checksum = NONE
#group replication
transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
loose-group_replication_start_on_boot=off
loose-group_replication_local_address= "192.168.1.232:24901"
loose-group_replication_group_seeds= "192.168.1.231:24901,192.168.1.232:24901,192.168.1.233:24901"
loose-group_replication_bootstrap_group= off
loose-group_replication_single_primary_mode=FALSE
loose-group_replication_enforce_update_everywhere_checks= TRUE
启动mysql5.7: ./bin/mysqld_safe --defaults-file=/etc/my3308.cnf --user=mysql &
修改登录密码: ./bin/mysqladmin -S /tmp/mysql3308.sock -u root -p password
进入mysql创建授权用户:
>SET SQL_LOG_BIN=0; ###创建授权用户不写入bin_log
>CREATE USER rpl_user@'%';
>GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'rpl_pass'; #创建授权用户
>FLUSH PRIVILEGES;
>SET SQL_LOG_BIN=1;
>CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='rpl_pass' FOR CHANNEL 'group_replication_recovery';
安装mysql group replication:
> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
>START GROUP_REPLICATION;
出现报错:
解决方法:每台机器做hosts解析组内其他机器ip对应的主机名
>START GROUP_REPLICATION; ###重启
还有报错:
解决方法:set global group_replication_allow_local_disjoint_gtids_join=ON; #兼容加入组
>START GROUP_REPLICATION; ###重新启动ok
>SELECT * FROM performance_schema.replication_group_members; 查看是否已经加入group
###查看是否已经同步server1建立的test数据库
> show databases;
>select * from test.t1;
server3(192.168.1.233) ###跟server2原理一样。
参考英文文档:http://mysqlhighavailability.com/mysqlha/gr/doc/