MySQL Group Replication single-machine multi-instance installation configuration

1. Create three database instances

mkdir /data/mysql/sock
mkdir –p /data/mysql/data/{s1,s2,s3}
mkdir /data/mysql/cnf
mkdir –p /data/mysql/logs/{s1,s2,s3}
cd /data/mysql
chown -R mysql:mysql *
cd /usr/local/mysql/
chown -R mysql:mysql *
bin/mysqld --initialize-insecure --basedir=/usr/local/mysql --datadir=/data/mysql/data/s1
bin/mysqld --initialize-insecure --basedir=/usr/local/mysql --datadir=/data/mysql/data/s2
bin/mysqld --initialize-insecure --basedir=/usr/local/mysql --datadir=/data/mysql/data/s3

2. Configure the first node

[mysqld]
#Server Configuration
basedir=/usr/local/mysql
datadir=/data/mysql/data/s1
port = 24801
socket = /data/mysql/sock/s1.sock

#Replication Framework
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=/data/mysql/logs/s1/binlog
binlog_format=ROW
relay-log=/data/mysql/logs/s1/relay-bin

#Group Replication
transaction_write_set_extraction=XXHASH64
loose- group_replication_group_name="b4668cea-d7ca-11e6-86b5-18a99b76310d"       
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

In the parameter configuration, except the following parameters are different in each node, other configurations are the same: datadir, port, socket, server_id, log_bin, relay-log, loose-group_replication_local_address

3. Start the first node

cd /usr/local/mysql/
sudo chown -R mysql:mysql *
ln -s /usr/local/mysql/bin/mysql /usr/bin
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/cnf/s1.cnf

4. Log in to the first node

mysql -h127.0.0.1 -P24801 -uroot --skip-password
#Change the default password after login
SET PASSWORD = PASSWORD('root');
flush privileges;

5. Create the users required for group replication

SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'rpl_pass';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='rpl_pass' FOR CHANNEL 'group_replication_recovery';

6. Enable group replication

mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
Query OK, 0 rows affected (0.05 sec)
mysql> SHOW PLUGINS;
+----------------------------+----------+--------------------+
| Name                       | Status   | Type               |
+----------------------------+----------+--------------------+
| binlog                     | ACTIVE   | STORAGE ENGINE     |
...
| group_replication          | ACTIVE   | GROUP REPLICATION  |
+----------------------------+----------+--------------------+
45 rows in set (0.02 sec)

7. Start group replication

SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;
#Check if group replication is started successfully
SELECT * FROM performance_schema.replication_group_members;

8. Configure the second node (only the differences from s1 are listed)

datadir=/data/mysql/data/s2
port = 24802
socket = /data/mysql/sock/s2.sock
server_id=2
log_bin=/data/mysql/logs/s2/binlog
relay-log=/data/mysql/logs/s2/relay-bin
loose-group_replication_local_address= "127.0.0.1:24902"

9. Start the second node (instance)

/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/cnf/s2.cnf

10. Log in to the second node and change the default password

mysql -h127.0.0.1 -P24802 -uroot --skip-password
SET PASSWORD = PASSWORD('root');
flush privileges;

11. Configure the users required for group replication

SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'rpl_pass';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='rpl_pass' FOR CHANNEL 'group_replication_recovery';

12. Install the group replication plugin

INSTALL PLUGIN group_replication SONAME 'group_replication.so';
Show plugins;
+----------------------------+----------+--------------------+
| Name                       | Status   | Type               |
+----------------------------+----------+--------------------+
| binlog                     | ACTIVE   | STORAGE ENGINE     |
...
| group_replication          | ACTIVE   | GROUP REPLICATION  |
+----------------------------+----------+--------------------+
45 rows in set (0.02 sec)

13. Add s2 to the group

set global group_replication_allow_local_disjoint_gtids_join=ON;
start group_replication;
#View the change group replication situation
SELECT * FROM performance_schema.replication_group_members;

14. Add a third node

The operation is the same as the second node, the parameters of s3.cnf are slightly different
#Add complete to view the running status of each node
SELECT * FROM performance_schema.replication_group_members;

References:

Wholesale mysql: http://www.cnblogs.com/kerrycode/p/4364465.html

MySQL Group Replication: http://mysqlhighavailability.com/mysqlha/gr/doc/getting_started.html

MySQL Group Replication single-machine multi-instance installation configuration

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