MySQL 8.0.42创建MGR集群

发布于：2025-07-28 ⋅ 阅读:(17) ⋅ 点赞:(0)

MySQL 8.0.42创建MGR集群

概述

关于MySQL MGR集群的介绍就不在这里做详细的介绍了，大家可以自己到官网上查看阅读。在这里主要是实际操作方面的内容

总体结构设计如下图
在这里插入图片描述

服务器节点信息

序号 角色 IP地址 数据库端口 MGR端口
1 主节点 192.168.56.104 3309 10061
2 从节点 192.168.56.105 3309 10061
3 从节点 192.168.56.106 3309 10061

my.cnf配置

节点1

[mysqld]
##basic settings###
server-id=104
port = 3309
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
skip-name-resolve
max_connections=1000
max_user_connections=800
max_allowed_packet=512M
max_connect_errors=100000
datadir = /usr/local/mysql/data
socket = /usr/local/mysql/data/mysql.sock
pid_file = /usr/local/mysql/data/mysql.pid
transaction_isolation = READ-COMMITTED
lower_case_table_names=1
default_time_zone =+8:00
open_files_limit=65535
log_timestamps=system
wait_timeout=900
interactive_timeout=900

##innodb setting##
innodb_buffer_pool_size = 256M
innodb_buffer_pool_instances = 1
innodb_io_capacity=2000
innodb_flush_method=O_DIRECT
innodb_flush_neighbors=0
innodb_flush_log_at_trx_commit = 1
innodb_print_all_deadlocks = 1
innodb_online_alter_log_max_size=128M
innodb_lock_wait_timeout=10
innodb_file_per_table=ON
innodb_doublewrite=ON

##log settings##
log-error = /usr/local/mysql/data/error.log
log-bin = /usr/local/mysql/data/mysql_bin.log
slow_query_log = 1
slow_query_log_file = /usr/local/mysql/data/mysql_slow_query.log
long_query_time = 10

##replication settings##
gtid-mode=on
enforce-gtid-consistency=true
master-info-repository=TABLE
relay-log-info-repository=TABLE
sync-master-info=1000
relay_log_recovery = 1
relay-log=/usr/local/mysql/data/relay-bin

#binlog
log_bin=/usr/local/mysql/data/binlog
#expire_logs_days=10  #MySQL 5.7版本
binlog_expire_logs_seconds = 604800 # 保留7天
max_binlog_cache_size=200M
sync_binlog=1

##MGR settings
binlog_checksum = NONE
log_replica_updates = ON
binlog_format=row

plugin_load_add='group_replication.so'
#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 = '192.168.56.104:10061'
#loose-group_replication_group_seeds ='192.168.56.104:10061,192.168.56.105:10061,192.168.56.106:10061'
#loose-group_replication_bootstrap_group = off
#loose-group_replication_ip_whitelist = '192.168.56.104/24,192.168.56.105/24,192.168.56.106/24'
#loose-group_replication_member_weight=50
#loose-group_replication_single_primary_mode=ON
#loose-group_replication_enforce_update_everywhere_checks=OFF  ###单主模式关闭，多主模式开启

[client]
port = 3309
socket = /usr/local/mysql/data/mysql.sock

节点2

[mysqld]
##basic settings###
server-id=105
port = 3309
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
skip-name-resolve
max_connections=1000
max_user_connections=800
max_allowed_packet=512M
max_connect_errors=100000
datadir = /usr/local/mysql/data
socket = /usr/local/mysql/data/mysql.sock
pid_file = /usr/local/mysql/data/mysql.pid
transaction_isolation = READ-COMMITTED
lower_case_table_names=1
default_time_zone =+8:00
open_files_limit=65535
log_timestamps=system
wait_timeout=900
interactive_timeout=900

##innodb setting##
innodb_buffer_pool_size = 256M
innodb_buffer_pool_instances = 1
innodb_io_capacity=2000
innodb_flush_method=O_DIRECT
innodb_flush_neighbors=0
innodb_flush_log_at_trx_commit = 1
innodb_print_all_deadlocks = 1
innodb_online_alter_log_max_size=128M
innodb_lock_wait_timeout=10
innodb_file_per_table=ON
innodb_doublewrite=ON

##log settings##
log-error = /usr/local/mysql/data/error.log
log-bin = /usr/local/mysql/data/mysql_bin.log
slow_query_log = 1
slow_query_log_file = /usr/local/mysql/data/mysql_slow_query.log
long_query_time = 10

##replication settings##
gtid-mode=on
enforce-gtid-consistency=true
master-info-repository=TABLE
relay-log-info-repository=TABLE
sync-master-info=1000
relay_log_recovery = 1
relay-log=/usr/local/mysql/data/relay-bin

#binlog
log_bin=/usr/local/mysql/data/binlog
#expire_logs_days=10  #MySQL 5.7版本
binlog_expire_logs_seconds = 604800 # 保留7天
max_binlog_cache_size=200M
sync_binlog=1

##MGR settings
binlog_checksum = NONE
log_replica_updates = ON
binlog_format=row

plugin_load_add='group_replication.so'
#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 = '192.168.56.105:10061'
#loose-group_replication_group_seeds ='192.168.56.104:10061,192.168.56.105:10061,192.168.56.106:10061'
#loose-group_replication_bootstrap_group = off
#loose-group_replication_ip_whitelist = '192.168.56.104/24,192.168.56.105/24,192.168.56.106/24'
#loose-group_replication_member_weight=50
#loose-group_replication_single_primary_mode=ON
#loose-group_replication_enforce_update_everywhere_checks=OFF  ###单主模式关闭，多主模式开启

[client]
port = 3309
socket = /usr/local/mysql/data/mysql.sock

节点3

[mysqld]
##basic settings###
server-id=106
port = 3309
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
skip-name-resolve
max_connections=1000
max_user_connections=800
max_allowed_packet=512M
max_connect_errors=100000
datadir = /usr/local/mysql/data
socket = /usr/local/mysql/data/mysql.sock
pid_file = /usr/local/mysql/data/mysql.pid
transaction_isolation = READ-COMMITTED
lower_case_table_names=1
default_time_zone =+8:00
open_files_limit=65535
log_timestamps=system
wait_timeout=900
interactive_timeout=900

##innodb setting##
innodb_buffer_pool_size = 256M
innodb_buffer_pool_instances = 1
innodb_io_capacity=2000
innodb_flush_method=O_DIRECT
innodb_flush_neighbors=0
innodb_flush_log_at_trx_commit = 1
innodb_print_all_deadlocks = 1
innodb_online_alter_log_max_size=128M
innodb_lock_wait_timeout=10
innodb_file_per_table=ON
innodb_doublewrite=ON

##log settings##
log-error = /usr/local/mysql/data/error.log
log-bin = /usr/local/mysql/data/mysql_bin.log
slow_query_log = 1
slow_query_log_file = /usr/local/mysql/data/mysql_slow_query.log
long_query_time = 10

##replication settings##
gtid-mode=on
enforce-gtid-consistency=true
master-info-repository=TABLE
relay-log-info-repository=TABLE
sync-master-info=1000
relay_log_recovery = 1
relay-log=/usr/local/mysql/data/relay-bin

#binlog
log_bin=/usr/local/mysql/data/binlog
#expire_logs_days=10  #MySQL 5.7版本
binlog_expire_logs_seconds = 604800 # 保留7天
max_binlog_cache_size=200M
sync_binlog=1

##MGR settings
binlog_checksum = NONE
log_replica_updates = ON
binlog_format=row

plugin_load_add='group_replication.so'
#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 = '192.168.56.106:10061'
#loose-group_replication_group_seeds ='192.168.56.104:10061,192.168.56.105:10061,192.168.56.106:10061'
#loose-group_replication_bootstrap_group = off
#loose-group_replication_ip_whitelist = '192.168.56.104/24,192.168.56.105/24,192.168.56.106/24'
#loose-group_replication_member_weight=50
#loose-group_replication_single_primary_mode=ON
#loose-group_replication_enforce_update_everywhere_checks=OFF  ###单主模式关闭，多主模式开启

[client]
port = 3309
socket = /usr/local/mysql/data/mysql.sock

三个节点的配置参数只是server-id和loose-group_replication_local_address不一样。在初始化的时候先注释掉mgr相关的参数，否则会提示ERROR，待初始化完成之后在取消注释

初始化数据库

所有节点

# 初始化数据目录
/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --initialize --user=mysql --basedir=/usr/local/mysql 

# 生成的临时密码会显示在终端，务必记录！
cat /usr/local/mysql/data/error.log 

# 启动关闭数据库
/usr/local/mysql/bin/mysqld_safe --defaults-file=/etc/my.cnf &
/usr/local/mysql/bin/mysqladmin -uroot -p123456 --socket=/usr/local/mysql/data/mysql.sock shutdown &

# 修改初始密码
/usr/local/mysql/bin/mysql -uroot -p 
alter user 'root'@'localhost' identified WITH mysql_native_password by '123456';
flush privileges;

配置MGR

节点1
#创建 MGR 同步用户

SET SQL_LOG_BIN=0;
CREATE USER 'rpl_user'@'%' IDENTIFIED WITH mysql_native_password BY 'rpl_pass';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%';
GRANT BACKUP_ADMIN ON *.* TO rpl_user@'%';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
select host,user,plugin from mysql.user;

reset master;
change master to
	master_user='rpl_user',
	master_password='rpl_pass'
	for channel 'group_replication_recovery';

#查看确认 MGR 组件

#install plugin group_replication soname 'group_replication.so';
show plugins;

#启动MGR复制组

set global group_replication_bootstrap_group=on;
start group_replication;
set global group_replication_bootstrap_group=off;

select * from performance_schema.replication_group_members;


###查看读写属性
select @@read_only, @@super_read_only;

节点2
#创建 MGR 同步用户

SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%' IDENTIFIED WITH mysql_native_password BY 'rpl_pass';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%';
GRANT BACKUP_ADMIN ON *.* TO rpl_user@'%';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
select host,user,plugin from mysql.user;

reset master;
change master to
	master_user='rpl_user',
	master_password='rpl_pass'
	for channel 'group_replication_recovery';
	
###启动 MGR 复制组
start group_replication;

select * from performance_schema.replication_group_members;

###查看读写属性
select @@read_only, @@super_read_only;

节点3
#创建 MGR 同步用户

SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%' IDENTIFIED WITH mysql_native_password BY 'rpl_pass';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%';
GRANT BACKUP_ADMIN ON *.* TO rpl_user@'%';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
select host,user,plugin from mysql.user;

reset master;
change master to
	master_user='rpl_user',
	master_password='rpl_pass'
	for channel 'group_replication_recovery';
	
###启动 MGR 复制组
start group_replication;

select * from performance_schema.replication_group_members;

###查看读写属性
select @@read_only, @@super_read_only;

结果

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 62f03723-6ade-11f0-8bc8-080027859595 | mgrser1     |        3309 | ONLINE       | PRIMARY     | 8.0.42         | XCom                       |
| group_replication_applier | 6afd9b46-6adf-11f0-88b8-080027238cc1 | mgrser2     |        3309 | ONLINE       | SECONDARY   | 8.0.42         | XCom                       |
| group_replication_applier | db344a82-6adf-11f0-ae5d-0800275e0275 | mgrser3     |        3309 | ONLINE       | SECONDARY   | 8.0.42         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
3 rows in set (0.00 sec)

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