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Katacoda

Swarm başlat

docker node ls

git clone https://github.com/dincerkurnaz/mysql-group-replication-docker-compose.git
cd mysql-group-replication-docker-compose

docker stack deploy --compose-file docker-compose.yml myapp

docker stack ps myapp

OR

docker ps -q -f name=myapp
263676ef6a12
b529ccaf779c
ea4a8ea23abf

docker exec 263676ef6a12 mysql -uroot -pmypass \
  -e "SET @@GLOBAL.group_replication_bootstrap_group=1;" \
  -e "CREATE USER IF NOT EXISTS 'repl'@'%';" \
  -e "GRANT REPLICATION SLAVE ON *.* TO repl@'%';" \
  -e "flush privileges;" \
  -e "change master to master_user='root' for channel 'group_replication_recovery';" \
  -e "SET @@GLOBAL.group_replication_consistency= 'BEFORE';" \
  -e "START GROUP_REPLICATION;" \
  -e "SET @@GLOBAL.group_replication_bootstrap_group=0;" \
  -e "SELECT * FROM performance_schema.replication_group_members;"

docker exec b529ccaf779c mysql -uroot -pmypass \
  -e "change master to master_user='repl' for channel 'group_replication_recovery';" \
  -e "SET @@GLOBAL.group_replication_consistency= 'BEFORE';" \
  -e "START GROUP_REPLICATION;"\
  -e "SELECT * FROM performance_schema.replication_group_members;"

docker exec ea4a8ea23abf mysql -uroot -pmypass \
  -e "change master to master_user='repl' for channel 'group_replication_recovery';" \
  -e "SET @@GLOBAL.group_replication_consistency= 'BEFORE';" \
  -e "START GROUP_REPLICATION;"\
  -e "SELECT * FROM performance_schema.replication_group_members;"

### CREATE USER 'root'@'%' IDENTIFIED BY 'password';
### GRANT ALL PRIVILEGES ON *.* TO 'root'@'%';


docker exec -ti 263676ef6a12 sh

yum-config-manager --disable mysql80-server-minimal
yum install -y procps

mysql -pmypass

SELECT * FROM performance_schema.replication_group_members;
create database dincer;
SHOW BINLOG EVENTS;
use dincer;
create table test (id int NOT NULL AUTO_INCREMENT PRIMARY KEY,name varchar(20));
insert into test set name="1";
select * from test;
insert into test set name=(rand());

delimiter //

CREATE PROCEDURE proc1()
BEGIN
    DECLARE i int DEFAULT 1;
    WHILE i <= 5000000 DO
        insert into test set name=(rand());
        SET i = i + 1;
    END WHILE;
END//

delimiter ;

call proc1();

mysql -pmypass -e 'use dincer; call proc1();' & 
watch -d -n 1 "mysql -pmypass -e 'use dincer; select count(*) from test;'"

SELECT * FROM performance_schema.replication_group_member_stats\G

bitti :)
####################################
docker stack ps myapp
docker stack services myapp
docker ps
docker logs -f xxxx
docker exec -ti 2f7ec0051b5c sh
mysql -pmypass
SET @@GLOBAL.group_replication_bootstrap_group=1;
create user 'repl'@'%';
GRANT REPLICATION SLAVE ON *.* TO repl@'%';
flush privileges;
change master to master_user='root' for channel 'group_replication_recovery';
START GROUP_REPLICATION;
SET @@GLOBAL.group_replication_bootstrap_group=0;
SELECT * FROM performance_schema.replication_group_members;

docker exec -ti 2f7ec0051354 sh
mysql -pmypass
change master to master_user='repl' for channel 'group_replication_recovery';
START GROUP_REPLICATION;
SHOW VARIABLES WHERE Variable_name = 'hostname';
SELECT * FROM performance_schema.replication_group_members;

mysql -pmypass
create database dincer;
SHOW BINLOG EVENTS;


Not:
INSTALL PLUGIN group_replication SONAME 'group_replication.so';
SHOW PLUGINS;

Build Status

Seeting up MySQL Group replication with Docker Compose

The below steps show how to setup MySQL Group Replication with Docker Compose using mysql/mysql-server:8.0 Docker images.

Other ways to setup Group Replication using Docker containers:

Step 1: Starting the containers

After clonning the project, run the following command:

docker-compose up -d

Wait for the State Up (healthy) in all 3 containers.

docker-compose ps

A similar output should appear:

Name               Command                  State                     Ports
-----------------------------------------------------------------------------------------
node1   /entrypoint.sh mysqld --se ...   Up (healthy)   0.0.0.0:3307->3306/tcp, 33060/tcp
node2   /entrypoint.sh mysqld --se ...   Up (healthy)   0.0.0.0:3308->3306/tcp, 33060/tcp
node3   /entrypoint.sh mysqld --se ...   Up (healthy)   0.0.0.0:3309->3306/tcp, 33060/tcp

Step 2: Bootstrap the group

Run the command below so node1 will bootstrap the group:

docker-compose exec node1 mysql -uroot -pmypass \
  -e "SET @@GLOBAL.group_replication_bootstrap_group=1;" \
  -e "create user 'repl'@'%';" \
  -e "GRANT REPLICATION SLAVE ON *.* TO repl@'%';" \
  -e "flush privileges;" \
  -e "change master to master_user='root' for channel 'group_replication_recovery';" \
  -e "START GROUP_REPLICATION;" \
  -e "SET @@GLOBAL.group_replication_bootstrap_group=0;" \
  -e "SELECT * FROM performance_schema.replication_group_members;"

Expected output:

mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| group_replication_applier | da26f305-19c5-11e9-a728-0242ac1e0002 | node1       |        3306 | RECOVERING   | SECONDARY   | 8.0.13         |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+

MEMBER_STATE should appear on RECOVERING or ONLINE state after some seconds.

Step 3: Join other nodes to group

Execute the command below to configure the other nodes and join the to group:

for N in 2 3
do docker-compose exec node$N mysql -uroot -pmypass \
  -e "change master to master_user='repl' for channel 'group_replication_recovery';" \
  -e "START GROUP_REPLICATION;"
done

Step 4: Check the group

Execute:

for N in 1 2 3
do docker-compose exec node$N mysql -uroot -pmypass \
  -e "SHOW VARIABLES WHERE Variable_name = 'hostname';" \
  -e "SELECT * FROM performance_schema.replication_group_members;"
done

The output expected is:

mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| hostname      | node1 |
+---------------+-------+
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| group_replication_applier | da26f305-19c5-11e9-a728-0242ac1e0002 | node1       |        3306 | ONLINE       | PRIMARY     | 8.0.13         |
| group_replication_applier | da4f5551-19c5-11e9-b4e5-0242ac1e0003 | node2       |        3306 | ONLINE       | SECONDARY   | 8.0.13         |
| group_replication_applier | da6bca74-19c5-11e9-b9f3-0242ac1e0004 | node3       |        3306 | ONLINE       | SECONDARY   | 8.0.13         |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| hostname      | node2 |
+---------------+-------+
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| group_replication_applier | da26f305-19c5-11e9-a728-0242ac1e0002 | node1       |        3306 | ONLINE       | PRIMARY     | 8.0.13         |
| group_replication_applier | da4f5551-19c5-11e9-b4e5-0242ac1e0003 | node2       |        3306 | ONLINE       | SECONDARY   | 8.0.13         |
| group_replication_applier | da6bca74-19c5-11e9-b9f3-0242ac1e0004 | node3       |        3306 | ONLINE       | SECONDARY   | 8.0.13         |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
mysql: [Warning] Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| hostname      | node3 |
+---------------+-------+
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+
| group_replication_applier | da26f305-19c5-11e9-a728-0242ac1e0002 | node1       |        3306 | ONLINE       | PRIMARY     | 8.0.13         |
| group_replication_applier | da4f5551-19c5-11e9-b4e5-0242ac1e0003 | node2       |        3306 | ONLINE       | SECONDARY   | 8.0.13         |
| group_replication_applier | da6bca74-19c5-11e9-b9f3-0242ac1e0004 | node3       |        3306 | ONLINE       | SECONDARY   | 8.0.13         |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+

Stop Start

docker-compose stop
docker-compose start
docker-compose logs -f

docker-compose exec node1 bash
SET @@GLOBAL.group_replication_bootstrap_group=1;
START GROUP_REPLICATION;
SET @@GLOBAL.group_replication_bootstrap_group=0;

docker-compose exec node2 bash
START GROUP_REPLICATION;
SELECT * FROM performance_schema.replication_group_members;

Step 5: Clean up

Run docker-compose down in the same path where docker-compose.yml file is located.