Mysql Mgr (MySQL Group Replication) cluster deployments
surroundings:
OS: Hundreds 7
Mysql versions: Community Edition 5.7.22
1. Installation Step
1.1 Environmental deployment
| Node Role |
ip |
| Node 1 |
192.168.1.134 |
| Node 2 |
192.168.1.135 |
| Node 3 |
192.168.1.136 |
1.2 Download the installation media
Mysql can go to the official website to download, here I downloaded version is: 5.7.27
1.3 Node 1 (192.168.1.134) installed
1.3.1 Extracting installation
[root@localhost soft]# tar -xvf mysql-5.7.27-linux-glibc2.12-x86_64.tar.gz
Transfer to the installation directory
[root@localhost soft]# mv mysql-5.7.27-linux-glibc2.12-x86_64 /opt/mysql_mgr
1.3.2 create the appropriate directories
[root@localhost mysql_mgr]# cd /opt/mysql_mgr
[Root @ localhost mysql_mgr] # mkdir data ## data file directory
[Root @ localhost mysql_mgr] # mkdir conf ## profile directory
[Root @ localhost mysql_mgr] # mkdir -p mysqllog / relaylog ## from the master environment relaylog
[Root @ localhost mysql_mgr] # mkdir -p mysqllog / logfile ## error log file
[root@localhost mysql_mgr]# mkdir -p mysqllog/binlog ##binlog文件
Mysql directory permissions to modify the user (if the user's system does not, you can create)
[root@localhost mysql_mgr]# cd /opt
[root@localhost opt]# chown -R mysql:mysql ./mysql_mgr
1.3.3 create a profile
| [mysqld] port=3306 basedir=/opt/mysql_mgr datadir=/opt/mysql_mgr/data character-set-server=utf8mb4 max_connections = 1500 show_compatibility_56=on
server_id=1 gtid_mode=ON enforce_gtid_consistency=ON binlog_checksum=NONE
log_bin=/opt/mysql_mgr/mysqllog/binlog/binlog log_slave_updates=ON binlog_format=ROW master_info_repository=TABLE relay_log_info_repository=TABLE relay_log_index=/opt/mysql_mgr/mysqllog/relaylog/slave-relay-bin.index relay_log=/opt/mysql_mgr/mysqllog/relaylog/relaylog-binlog
## cluster part 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= "192.168.1.134:33061" loose-group_replication_group_seeds= "192.168.1.134:33061,192.168.1.135:33061,192.168.1.136:33061" loose-group_replication_bootstrap_group=OFF report_host=192.168.1.134 report_port=3306 |
1.3.4 初始化数据库
[mysql@localhost bin]$ cd /opt/mysql_mgr/bin
[mysql@localhost bin]$ ./mysqld --initialize-insecure --basedir=/opt/mysql_mgr --datadir=/opt/mysql_mgr/data --user=mysql
2019-09-03T03:00:25.190551Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2019-09-03T03:00:26.960483Z 0 [Warning] InnoDB: New log files created, LSN=45790
2019-09-03T03:00:27.273154Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2019-09-03T03:00:27.411863Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: fb59af57-cdf6-11e9-bf83-525400c8dc1f.
2019-09-03T03:00:27.435468Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2019-09-03T03:00:27.436258Z 1 [Warning] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.
1.3.5 启动数据库
./mysqld_safe --defaults-file=/opt/mysql_mgr/conf/my.cnf --user=mysql &
1.3.6 登陆
这里密码为空，不用输入密码，为了安全起见安装完成后自行修改密码
[mysql@localhost bin]$ ./mysql -h localhost -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.27-log MySQL Community Server (GPL)
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases
-> ;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.01 sec)
mysql> select version();
+------------+
| version() |
+------------+
| 5.7.27-log |
+------------+
1 row in set (0.00 sec)
1.4 节点2(192.168.1.135)安装
安装部署跟节点1一致,只是配置文件需要适当修改
1.4.1 创建配置文件
拷贝一个节点1的过来修改即可,修改红色部分
| [mysqld] port=3306 basedir=/opt/mysql_mgr datadir=/opt/mysql_mgr/data character-set-server=utf8mb4 max_connections = 1500 show_compatibility_56=on
server_id=135 gtid_mode=ON enforce_gtid_consistency=ON binlog_checksum=NONE
log_bin=/opt/mysql_mgr/mysqllog/binlog/binlog log_slave_updates=ON binlog_format=ROW master_info_repository=TABLE relay_log_info_repository=TABLE relay_log_index=/opt/mysql_mgr/mysqllog/relaylog/slave-relay-bin.index relay_log=/opt/mysql_mgr/mysqllog/relaylog/relaylog-binlog
##集群部分 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= "192.168.1.135:33061" loose-group_replication_group_seeds= "192.168.1.134:33061,192.168.1.135:33061,192.168.1.136:33061" loose-group_replication_bootstrap_group=OFF report_host=192.168.1.135 report_port=3306 |
1.4.2 启动数据库
./mysqld_safe --defaults-file=/opt/mysql_mgr/conf/my.cnf --user=mysql &
1.5 节点3(192.168.1.136)安装
1.5.1 创建配置文件
| [mysqld] port=3306 basedir=/opt/mysql_mgr datadir=/opt/mysql_mgr/data character-set-server=utf8mb4 max_connections = 1500 show_compatibility_56=on
server_id=136 gtid_mode=ON enforce_gtid_consistency=ON binlog_checksum=NONE
log_bin=/opt/mysql_mgr/mysqllog/binlog/binlog log_slave_updates=ON binlog_format=ROW master_info_repository=TABLE relay_log_info_repository=TABLE relay_log_index=/opt/mysql_mgr/mysqllog/relaylog/slave-relay-bin.index relay_log=/opt/mysql_mgr/mysqllog/relaylog/relaylog-binlog
##集群部分 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= "192.168.1.136:33061" loose-group_replication_group_seeds= "192.168.1.134:33061,192.168.1.135:33061,192.168.1.136:33061" loose-group_replication_bootstrap_group=OFF report_host=192.168.1.136 report_port=3306 |
1.5.2 启动数据库
./mysqld_safe --defaults-file=/opt/mysql_mgr/conf/my.cnf --user=mysql &
1.6 单组模式配置集群
1.6.1 安装MGR插件(所有节点执行)
每个节点上都要执行
[mysql@localhost bin]$ ./mysql -h localhost -uroot
mysql> install plugin group_replication soname 'group_replication.so';
Query OK, 0 rows affected (0.04 sec)
1.6.2 设置复制账号(所有节点执行)
#设置复制账号
mysql> SET SQL_LOG_BIN=0;
mysql> CREATE USER repl@'%' IDENTIFIED BY 'repl';
mysql> GRANT REPLICATION SLAVE ON *.* TO repl@'%';
mysql> FLUSH PRIVILEGES;
mysql> SET SQL_LOG_BIN=1;
mysql> CHANGE MASTER TO MASTER_USER='repl', MASTER_PASSWORD='repl' FOR CHANNEL 'group_replication_recovery';
1.6.3 启动MGR单主模式(节点上192.168.1.134执行)
# 启动MGR，在主库(192.168.1.134)上执行
mysql> set global group_replication_bootstrap_group=on;
mysql> start group_replication;
mysql> set global group_replication_bootstrap_group=off;
查看mgr组信息
mysql> SELECT * FROM performance_schema.replication_group_members;
#其他节点加入MGR,在从库(192.168.1.135,192.168.1.136)上执行
mysql> start group_replication;
在节点1上查看mgr组信息
mysql> SELECT * FROM performance_schema.replication_group_members;
查看那个是主节点:
mysql> select * from performance_schema.global_status where variable_name='group_replication_primary_member';
可以看出目前192.168.1.134是主节点
1.6.4 验证
1.6.4.1 主库写入重库查询
在主库上(192.168.1.134)创建数据库并创建表写入测试数据
create table tb_test
(id int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键id',
name varchar(64),
PRIMARY KEY (id)
);
insert into tb_test values(1,'name1');
insert into tb_test values(2,'name2');
insert into tb_test values(3,'name3');
insert into tb_test values(4,'name4');
insert into tb_test values(5,'name5');
insert into tb_test values(6,'name6');
insert into tb_test values(7,'name7');
insert into tb_test values(8,'name8');
insert into tb_test values(9,'name9');
insert into tb_test values(10,'name10');
分别从另外2个从库查询数据
192.168.1.135从库查询
mysql> select * from tb_test;
+----+--------+
| id | name |
+----+--------+
| 1 | name1 |
| 2 | name2 |
| 3 | name3 |
| 4 | name4 |
| 5 | name5 |
| 6 | name6 |
| 7 | name7 |
| 8 | name8 |
| 9 | name9 |
| 10 | name10 |
+----+--------+
10 rows in set (0.00 sec)
192.168.1.136从库查询
mysql> select * from tb_test;
+----+--------+
| id | name |
+----+--------+
| 1 | name1 |
| 2 | name2 |
| 3 | name3 |
| 4 | name4 |
| 5 | name5 |
| 6 | name6 |
| 7 | name7 |
| 8 | name8 |
| 9 | name9 |
| 10 | name10 |
+----+--------+
10 rows in set (0.00 sec)
1.6.4.2 尝试从库写入
192.168.1.135从库尝试写入
mysql> insert into tb_test values(11,'name11');
ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement
192.168.1.136从库尝试写入
mysql> insert into tb_test values(11,'name11');
ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement
1.6.4.3 关闭主库
关闭主库节点192.168.1.134
[mysql@localhost bin]$ ./mysqladmin -h localhost -uroot shutdown
登陆其中一个从库检查mgr组信息\
SELECT * FROM performance_schema.replication_group_members;
可以发现当前的节点只有2个了，下面看下目前那个是主库
select * from performance_schema.global_status where variable_name='group_replication_primary_member';
可以发现192.168.1.136已经成为主节点,尝试在该节点上写入数据
mysql> insert into tb_test values(11,'name11');
Query OK, 1 row affected (0.09 sec)
写入成功
1.6.4.4 启动之前关闭的主库
192.168.1.134上操作
[mysql@localhost bin]$ ./mysqld_safe --defaults-file=/opt/mysql_mgr/conf/my.cnf --user=mysql &
SELECT * FROM performance_schema.replication_group_members;
select * from performance_schema.global_status where variable_name='group_replication_primary_member';
可以看到当前该节点没有加入到mgr,这个时候需要执行如下命令
mysql> start group_replication;
启动后成为从库
可以看到启动后该节点不会为主库,而是成为从库
1.6.4.5 所有的节点都关闭然后启动
三个节点执行关闭命令
./mysqladmin -h localhost -uroot shutdown
然后启动
./mysqld_safe --defaults-file=/opt/mysql_mgr/conf/my.cnf --user=mysql &
启动后发现目前是没有mgr组信息的
需要执行如下命令启动mgr
主节点执行(要想那个成为主节点就执行如下命令):
set global group_replication_bootstrap_group=on;
start group_replication;
set global group_replication_bootstrap_group=off;
其他从节点执行:
start group_replication;
1.7 单主切换到多主模式
# 停止组复制(所有节点执行)：
mysql> stop group_replication;
mysql> set global group_replication_single_primary_mode=off;
mysql> set global group_replication_enforce_update_everywhere_checks=on;
# 随便选择某个节点执行
mysql> set global group_replication_bootstrap_group=on;
mysql> start group_replication;
mysql> set global group_replication_bootstrap_group=off;
# 其他节点执行
mysql> start group_replication;
查看节点信息
可以发现group_replication_primary_member为空,说明该模式为多主模式
尝试每个节点写入数据:
192.168.1.134节点写入:
insert into tb_test values(12,'name12');
192.168.1.135节点写入:
insert into tb_test values(13,'name13');
192.168.1.136节点写入:
insert into tb_test values(14,'name14');
说明当前每个节点都是主节点同时可以写入
1.8 多主切换回到单主模式
# 所有节点执行
mysql> stop group_replication;
mysql> set global group_replication_enforce_update_everywhere_checks=OFF;
mysql> set global group_replication_single_primary_mode=ON;
#主节点执行
set global group_replication_bootstrap_group=on;
start group_replication;
set global group_replication_bootstrap_group=off;
##其他节点
start group_replication;
查看当前主节点
1.9 遇到的错误
1.9.1 表必须有主键
mysql> insert into tb_test values(1,'name1');
ERROR 3098 (HY000): The table does not comply with the requirements by an external plugin.
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