Introduction
In this tutorial, How to use Docker deploy MySQL cluster and connect to
the nodes from your local machine. We will be deploying MySQL server
with docker.

1 Management node

2 Data nodes

2 SQL nodes
The nodes in the cluster are running on separate hosts in a network.
First, You have installed docker in your machine.
Docker deploy MySQL cluster
Step 1: Create the docker network.
I will create a network for MySQL cluster with the following docker
command.
docker network create cluster --subnet=192.168.4.0/24
Step 2: Get the mysql docker repository
git clone https://github.com/mysql/mysql-docker.git
cd mysql-docker
git checkout -b mysql-cluster
I will change the IP address of each node to match the subnet.
Open mysql-cluster/8.0/cnf/mysql-cluster.cnf file
For example
[ndbd default]
NoOfReplicas=2
DataMemory=80M
IndexMemory=18M
[ndb_mgmd]
NodeId=1
hostname=192.168.4.2
datadir=/var/lib/mysql
[ndbd]
NodeId=2
hostname=192.168.4.3
datadir=/var/lib/mysql
[ndbd]
NodeId=3
hostname=192.168.4.4
datadir=/var/lib/mysql
[mysqld]
NodeId=4
hostname=192.168.4.10
[mysqld]
NodeId=5
hostname=192.168.4.11
Open mysql-cluster/8.0/cnf/my.cnf and the modify as below
[mysqld]
ndbcluster
ndb-connectstring=192.168.4.2
user=mysql
[mysql_cluster]
ndb-connectstring=192.168.4.2
Docker image build
docker build -t <image_name> <Path to docker file>
docker build -t mysql-cluster mysql-cluster/8.0
Step 3: Create the manager node.
docker run -d --net=cluster --name=management1 --ip=192.168.4.2
mysql-cluster ndb_mgmd
Step 4: Create the data nodes
docker run -d --net=cluster --name=ndb1 --ip=192.168.4.3
mysql-cluster ndbd
docker run -d --net=cluster --name=ndb2 --ip=192.168.4.4
mysql-cluster ndbd
Step 5: Create the sql nodes.
docker run -d --net=cluster --name=mysql1 --ip=192.168.4.10 -e
MYSQL_RANDOM_ROOT_PASSWORD=true mysql-cluster mysqld
docker run -d --net=cluster --name=mysql2 --ip=192.168.4.11 -e
MYSQL_RANDOM_ROOT_PASSWORD=true mysql-cluster mysqld
docker run -it --net=cluster mysql-cluster ndb_mgm
The cluster management console will be loaded.
[Entrypoint] MySQL Docker Image 8.0.28-1.2.7-cluster
[Entrypoint] Starting ndb_mgm
-- NDB Cluster -- Management Client -ndb_mgm>
Run show command
ndb_mgm> show
Connected to Management Server at: 192.168.4.2:1186
Cluster Configuration
--------------------[ndbd(NDB)]
2 node(s)
id=2
@192.168.4.3
(mysql-8.0.28 ndb-8.0.28, Nodegroup: 0, *)
id=3
@192.168.4.4
(mysql-8.0.28 ndb-8.0.28, Nodegroup: 0)
[ndb_mgmd(MGM)] 1 node(s)
id=1
@192.168.4.2
[mysqld(API)]
(mysql-8.0.28 ndb-8.0.28)
2 node(s)
id=4
@192.168.4.10
(mysql-8.0.28 ndb-8.0.28)
id=5
@192.168.4.11
(mysql-8.0.28 ndb-8.0.28)
ndb_mgm>
Step 7. Change the default passwords.
mysql node 1:
The SQL nodes are created initially, a random password. Get the default
password.
docker logs mysql1 2>&1 | grep PASSWORD
To change the password, first, Input password default at Step 7
docker exec -it mysql1 mysql -uroot -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'root';
FLUSH PRIVILEGES;
mysql node 2:
The SQL nodes are created initially, a random password. Get the default
password.
docker logs mysql2 2>&1 | grep PASSWORD
To change the password, first, Input password default at Step 7
docker exec -it mysql2 mysql -uroot -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'root';
FLUSH PRIVILEGES;
Step 8: Login and create a new database.
For example, I will create huupv account on mysql1 and mysql2 containers
and access any hosts.
# For mysql1
docker exec -it mysql1 mysql -uroot -p
CREATE USER 'huupv'@'%' IDENTIFIED BY '123456789';
GRANT ALL ON *.* TO 'huupv'@'%';
FLUSH PRIVILEGES;
# For mysql2
docker exec -it mysql2 mysql -uroot -p
CREATE USER 'huupv'@'%' IDENTIFIED BY '123456789';
GRANT ALL ON *.* TO 'huupv'@'%';
FLUSH PRIVILEGES;
Create new a database.
create schema test_db;
The output terminal is as below:
vagrant@devopsroles:~/mysql-docker$ docker exec -it mysql1 mysql
-uroot -p
Enter password:
Welcome to the MySQL monitor.
Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 8.0.28-cluster MySQL Cluster Community Server GPL
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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> CREATE USER 'huupv'@'%' IDENTIFIED BY '123456789';
Query OK, 0 rows affected (0.02 sec)
mysql> GRANT ALL ON *.* TO 'huupv'@'%';
Query OK, 0 rows affected (0.11 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.02 sec)
mysql> exit
Bye
vagrant@devopsroles:~/mysql-docker$ docker exec -it mysql2 mysql
-uroot -p
Enter password:
Welcome to the MySQL monitor.
Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 8.0.28-cluster MySQL Cluster Community Server GPL
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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> CREATE USER 'huupv'@'%' IDENTIFIED BY '123456789';
ERROR 1396 (HY000): Operation CREATE USER failed for 'huupv'@'%'
mysql> GRANT ALL ON *.* TO 'huupv'@'%';
Query OK, 0 rows affected (0.10 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
mysql> exit
Bye
vagrant@devopsroles:~/mysql-docker$
Login from my machine.
mysql -h192.168.4.10 -uhuupv -p
mysql -h192.168.4.11 -uhuupv -p