实践过程：
- 在一台服务器上安装3个MySQL（s1,s2,s3）
- 配置s1，启动 Group Replication
- 配置s2，添加到组中
- 配置s3，添加到组中
- 测试
内容比较长，可能不方便实际操作，我也做了一个PDF版本，您可以下载查看，发送消息 ‘gr‘ 会自动回复下载地址
详细配置过程
（1）下载 mysql-5.7.17
https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz（2）安装
解压
tar zxf mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
mv mysql-5.7.17-linux-glibc2.5-x86_64 /usr/local/mysql-5.7
cd /usr/local初始化3个mysql（s1、s2、s3）
mkdir data
mysql-5.7/bin/mysqld --initialize-insecure --basedir=$PWD/mysql-5.7 --datadir=$PWD/data/s1
mysql-5.7/bin/mysqld --initialize-insecure --basedir=$PWD/mysql-5.7 --datadir=$PWD/data/s2
mysql-5.7/bin/mysqld --initialize-insecure --basedir=$PWD/mysql-5.7 --datadir=$PWD/data/s3（3）创建mysql用户
groupadd mysql5.7
useradd -g mysql5.7 mysql5.7
chown -R mysql5.7:mysql5.7 /usr/local/mysql-5.7
chown -R mysql5.7:mysql5.7 /usr/local/data
su mysql5.7（4）配置 s1 启动 group replication
新建配置文件 data/s1/s1.cnf，内容：
[mysqld]
# server configuration
datadir=/usr/local/data/s1
basedir=/usr/local/mysql-5.7/
port=24801
socket=/usr/local/data/s1/s1.sock
server_id=1
gtid_mode=ON
enforce_gtid_consistency=ON
master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE
log_slave_updates=ON
log_bin=binlog
binlog_format=ROW
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= "127.0.0.1:24901"
loose-group_replication_group_seeds= "127.0.0.1:24901,127.0.0.1:24902,127.0.0.1:24903"
loose-group_replication_bootstrap_group= off
loose-group_replication_single_primary_mode=FALSE
loose-group_replication_enforce_update_everywhere_checks= TRUE启动 s1
nohup mysql-5.7/bin/mysqld --defaults-file=data/s1/s1.cnf >data/s1/nohup.out 2>&1 &登录 s1
mysql-5.7/bin/mysql -uroot -h127.0.0.1 -P24801 --skip-password修改 root 登录密码
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘A123456‘;创建用于复制的用户
mysql> SET SQL_LOG_BIN=0;
mysql> CREATE USER [email protected]‘%‘;
mysql> GRANT REPLICATION SLAVE ON *.* TO [email protected]‘%‘ IDENTIFIED BY ‘rpl_pass‘;
mysql> FLUSH PRIVILEGES;
mysql> SET SQL_LOG_BIN=1;
mysql> CHANGE MASTER TO MASTER_USER=‘rpl_user‘, MASTER_PASSWORD=‘rpl_pass‘ FOR CHANNEL ‘group_replication_recovery‘;安装组复制插件
mysql> INSTALL PLUGIN group_replication SONAME ‘group_replication.so‘;检验
mysql> SHOW PLUGINS;安装成功的话，在结果信息底部会看到 group_replication 的记录
启动组复制
mysql> SET GLOBAL group_replication_bootstrap_group=ON;
mysql> START GROUP_REPLICATION;
mysql> SET GLOBAL group_replication_bootstrap_group=OFF;查看组成员
mysql> SELECT * FROM performance_schema.replication_group_members;s1 配置完成了，现在创建一个测试表，用来验证之后添加新成员时复制是否成功
mysql> CREATE DATABASE test;
Query OK, 1 row affected (0,00 sec)
mysql> use test
Database changed
mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 TEXT NOT NULL);
Query OK, 0 rows affected (0,00 sec)
mysql> INSERT INTO t1 VALUES (1, ‘Luis‘);
Query OK, 1 row affected (0,01 sec)
mysql> SELECT * FROM t1;
+----+------+
| c1 | c2 |
+----+------+
| 1 | Luis |
+----+------+（5）向复制组中添加 s2
新建s2的配置文件 data/s2/s2.cnf，内容：
[mysqld]
# server configuration
datadir=/usr/local/data/s1
basedir=/usr/local/mysql-5.7/
port=24802
socket=/usr/local/data/s1/s1.sock
server_id=2
gtid_mode=ON
enforce_gtid_consistency=ON
master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE
log_slave_updates=ON
log_bin=binlog
binlog_format=ROW
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= "127.0.0.1:24902"
loose-group_replication_group_seeds= "127.0.0.1:24901,127.0.0.1:24902,127.0.0.1:24903"
loose-group_replication_bootstrap_group= off
loose-group_replication_single_primary_mode=FALSE
loose-group_replication_enforce_update_everywhere_checks= TRUE启动s2
nohup mysql-5.7/bin/mysqld --defaults-file=data/s2/s2.cnf >data/s2/nohup.out 2>&1 &登录到s2
mysql-5.7/bin/mysql -uroot -h127.0.0.1 -P24802 --skip-password执行以下命令，添加复制用户
mysql> SET SQL_LOG_BIN=0;
Query OK, 0 rows affected (0,00 sec)
mysql> CREATE USER [email protected]‘%‘;
Query OK, 0 rows affected (0,00 sec)
mysql> GRANT REPLICATION SLAVE ON *.* TO [email protected]‘%‘ IDENTIFIED BY ‘rpl_pass‘;
Query OK, 0 rows affected, 1 warning (0,00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0,00 sec)
mysql> SET SQL_LOG_BIN=1;
Query OK, 0 rows affected (0,00 sec)
mysql> CHANGE MASTER TO MASTER_USER=‘rpl_user‘, MASTER_PASSWORD=‘rpl_pass‘ FOR CHANNEL ‘group_replication_recovery‘;
Query OK, 0 rows affected, 2 warnings (0,01 sec)添加组复制插件
mysql> INSTALL PLUGIN group_replication SONAME ‘group_replication.so‘;
Query OK, 0 rows affected (0,01 sec)启动复制
mysql> START GROUP_REPLICATION;
Query OK, 0 rows affected (44,88 sec)查看现在组中成员信息
mysql> SELECT * FROM performance_schema.replication_group_members;可以看到2个成员了，s2 添加成功
查询一下测试表，看数据是否复制过来了
mysql> SHOW DATABASES LIKE ‘test‘;
+-----------------+
| Database (test) |
+-----------------+
| test |
+-----------------+
1 row in set (0,00 sec)
mysql> SELECT * FROM test.t1;
+----+------+
| c1 | c2 |
+----+------+
| 1 | Luis |
+----+------+
1 row in set (0,00 sec)（6）添加第3个mysql实例 s3
新建配置文件 data/s3/s3.cnf
[mysqld]
# server configuration
datadir=/usr/local/data/s3
basedir=/usr/local/mysql-5.7/
port=24803
socket=/usr/local/data/s3/s3.sock
server_id=3
gtid_mode=ON
enforce_gtid_consistency=ON
master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE
log_slave_updates=ON
log_bin=binlog
binlog_format=ROW
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= "127.0.0.1:24903"
loose-group_replication_group_seeds= "127.0.0.1:24901,127.0.0.1:24902,127.0.0.1:24903"
loose-group_replication_bootstrap_group= off
loose-group_replication_single_primary_mode=FALSE
loose-group_replication_enforce_update_everywhere_checks= TRUE启动s3
nohup mysql-5.7/bin/mysqld --defaults-file=data/s3/s3.cnf >data/s3/nohup.out 2>&1 &登录s3
mysql-5.7/bin/mysql -uroot -h127.0.0.1 -P24803 --skip-password创建复制用户
mysql> SET SQL_LOG_BIN=0;
mysql> CREATE USER [email protected]‘%‘;
mysql> GRANT REPLICATION SLAVE ON *.* TO [email protected]‘%‘ IDENTIFIED BY ‘rpl_pass‘;
mysql> FLUSH PRIVILEGES;
mysql> SET SQL_LOG_BIN=1;
mysql> CHANGE MASTER TO MASTER_USER=‘rpl_user‘, MASTER_PASSWORD=‘rpl_pass‘ FOR CHANNEL ‘group_replication_recovery‘;安装组复制插件，并启动
INSTALL PLUGIN group_replication SONAME ‘group_replication.so‘;
START GROUP_REPLICATION;查看组成员
mysql> SELECT * FROM performance_schema.replication_group_members;已经3个成员，s3成功加入了
看一下数据是否复制过来了
mysql> SHOW DATABASES LIKE ‘test‘;
+-----------------+
| Database (test) |
+-----------------+
| test |
+-----------------+
1 row in set (0,00 sec)
mysql> SELECT * FROM test.t1;
+----+------+
| c1 | c2 |
+----+------+
| 1 | Luis |
+----+------+
1 row in set (0,00 sec)没问题
（7）s3中测试插入数据
s3中执行
mysql> use test
mysql> INSERT INTO t1 VALUES (2, ‘s3 test‘);
mysql> select * from t1;
+----+---------+
| c1 | c2 |
+----+---------+
| 1 | Luis |
| 2 | s3 test |
+----+---------+
2 rows in set (0.00 sec)登录s1查看一下数据是否复制成功
mysql-5.7/bin/mysql -uroot -h127.0.0.1 -P24801 -pA123456查询
mysql> use test
mysql> select * from t1;
+----+---------+
| c1 | c2 |
+----+---------+
| 1 | Luis |
| 2 | s3 test |
+----+---------+
2 rows in set (0.00 sec)复制成功，group replication 配置完成
时间： 2024-12-31 20:02:05