MySQL MGR架构 实现

主机名	Ip	角色
mysql1	10.188.34.10	主
mysql2	10.188.34.9	备
mysql3	10.188.34.11	备

修改host文件（和主机名一致）按实际IP和主键名修改

vi /etc/hosts

10.188.34.10 mysql1

10.188.34.9 mysql2

10.188.34.11 mysql3

准备

要等到业务不再使用，进行备份复制，保持数据一致

备份

msyqldump -u root -pmysql8.0.com --skip-add-drop-table --set-gtid-purged=OFF --routines --single_transaction --master-data=2 --all-databases -S /data/mysql/tmp/mysqld.sock > /data/all_back.sql

将主库备份的数据传到备库

scp all_databases.sql [email protected]:/xx/   从库IP

复制（从库）

登录
mysql -u root -pmysql8.0.com 
source /xx/all_databases.sql

编辑配置文件

主库

server_id =  1


enforce_gtid_consistency = ON
gtid_mode = ON
binlog_checksum = none
default_authentication_plugin = mysql_native_password 


plugin_dir = /usr/local/mysql/lib/plugin
log_slave_updates = ON
binlog_format = ROW
master_info_repository = TABLE


relay_log_info_repository = TABLE
transaction_write_set_extraction = XXHASH64
loose-group_replication_recovery_use_ssl = ON
loose-group_replication_group_name = "aadaaaaa-adda-adda-aaaa-aaaaaaddaaaa"
loose-group_replication_start_on_boot = OFF
loose-group_replication_local_address = "mysql1:33061"
loose-group_replication_group_seeds = "mysql1:33061,mysql2:33062,mysql3:33063"
loose-group_replication_bootstrap_group = OFF

从库1

server_id =  2


enforce_gtid_consistency = ON
gtid_mode = ON
binlog_checksum = none
default_authentication_plugin = mysql_native_password 


plugin_dir = /usr/local/mysql/lib/plugin
log_slave_updates = ON
binlog_format = ROW
master_info_repository = TABLE
relay_log_info_repository = TABLE
transaction_write_set_extraction = XXHASH64
loose-group_replication_recovery_get_public_key = ON
loose-group_replication_recovery_use_ssl = ON
loose-group_replication_group_name = "aadaaaaa-adda-adda-aaaa-aaaaaaddaaaa"
loose-group_replication_start_on_boot = OFF
loose-group_replication_local_address = "mysql2:33062"
loose-group_replication_group_seeds = "mysql1:33061,mysql2:33062,mysql3:33063"
loose-group_replication_bootstrap_group = OFF

从库2

server_id =  3 


enforce_gtid_consistency = ON
gtid_mode = ON
binlog_checksum = none
default_authentication_plugin = mysql_native_password 


plugin_dir = /usr/local/mysql/lib/plugin
log_slave_updates = ON
binlog_format = ROW
master_info_repository = TABLE
relay_log_info_repository = TABLE
transaction_write_set_extraction = XXHASH64
loose-group_replication_recovery_get_public_key = ON
loose-group_replication_recovery_use_ssl = ON
loose-group_replication_group_name = "aadaaaaa-adda-adda-aaaa-aaaaaaddaaaa"
loose-group_replication_start_on_boot = OFF
loose-group_replication_local_address = "mysql3:33063"
loose-group_replication_group_seeds = "mysql1:33061,mysql2:33062,mysql3:33063"
loose-group_replication_bootstrap_group = OFF

之后重启数据库

mysqld_safe --defaults-file=/data/mysql/conf/my.cnf-old &

修改 auto.cnf

su  - mysql
cd $MYSQL_DATA_HOME/data/
mv auto.cnf auto.cnf.bk

主从节点创建账号

mysql> SET SQL_LOG_BIN=0;
mysql> CREATE USER mgruser@'%' IDENTIFIED BY 'rootROOT@123';
mysql> GRANT REPLICATION SLAVE ON *.* TO mgruser@'%';
mysql> FLUSH PRIVILEGES;
mysql> SET SQL_LOG_BIN=1;
mysql> CHANGE MASTER TO MASTER_USER='mgruser', MASTER_PASSWORD='rootROOT@123' FOR CHANNEL 'group_replication_recovery';
grant all privileges on *.* to mgruser@"%" ;

主从节点安装组插件

install PLUGIN group_replication SONAME 'group_replication.so';
show plugins;

主从库都要执行（gtid一致）

reset master
CHANGE MASTER TO MASTER_USER='mgruser', MASTER_PASSWORD='rootROOT@123' FOR CHANNEL 'group_replication_recovery';

主库开启

SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;
SELECT * FROM performance_schema.replication_group_members;

从库

START GROUP_REPLICATION;

查看

SELECT * FROM performance_schema.replication_group_members;

异常

分析原因 主备 uuid 一致导致搭建失败，了解到虚拟机是克隆过来的，克隆完之后所有的文件都是一样的，包括IP地址、mac地址、uuid等。导致mysql的uuid一样

克隆的虚拟机导致mysql主从UUID一致怎么修改_克隆虚拟机uuid一样怎么办_WuYle的博客-CSDN博客

解决

登录数据库

select uuid()

将结果值，添加到配置文件，之后重启数据库

保持 gtid 一致

reset master
CHANGE MASTER TO MASTER_USER='mgruser', MASTER_PASSWORD='rootROOT@123' FOR CHANNEL 'group_replication_recovery';

开启组关系

START GROUP_REPLICATION;