mysql galera cluster

create my.cnf file
```
$ nano my.cnf
[mysqld]
ndbcluster
ndb-connectstring=10.20.30.10
user=mysql

[mysql_cluster]
ndb-connectstring=10.20.30.10
```

and create mysql-cluster.cnf
```
$ nano mysql-cluster.cnf
[ndb_mgmd]
NodeId=1
hostname=10.20.30.10
datadir=/var/lib/mysql

[ndbd]
NodeId=2
hostname=10.20.30.50
datadir=/var/lib/mysql

[ndbd]
NodeId=3
hostname=10.20.30.51
datadir=/var/lib/mysql

[mysqld]
NodeId=4
hostname=10.20.30.100

[mysqld]
NodeId=5
hostname=10.20.30.101
```
create docker-compose.yaml
```
version: "3.3"
services:

  mysql-mgm1:
    image: mysql/mysql-cluster
    volumes:
      - $PWD/my.cnf:/etc/my.cnf
      - $PWD/mysql-cluster.cnf:/etc/mysql-cluster.cnf
    networks:
      dev_net:
        ipv4_address: 10.20.30.10
    command:
      - ndb_mgmd

  mysql-ndb1:
    image: mysql/mysql-cluster
    volumes:
      - $PWD/my.cnf:/etc/my.cnf
      - $PWD/mysql-cluster.cnf:/etc/mysql-cluster.cnf
    networks:
      dev_net:
        ipv4_address: 10.20.30.50
    command:
      - ndbd

  mysql-ndb2:
    image: mysql/mysql-cluster
    volumes:
      - $PWD/my.cnf:/etc/my.cnf
      - $PWD/mysql-cluster.cnf:/etc/mysql-cluster.cnf
    networks:
      dev_net:
        ipv4_address: 10.20.30.51
    command:
      - ndbd

  mysql-srv1:
    image: mysql/mysql-cluster
    volumes:
      - $PWD/my.cnf:/etc/my.cnf
      - $PWD/mysql-cluster.cnf:/etc/mysql-cluster.cnf
    networks:
      dev_net:
        ipv4_address: 10.20.30.100
    environment:
    - MYSQL_ROOT_PASSWORD=root
    command:
      - mysqld

  mysql-srv2:
    image: mysql/mysql-cluster
    volumes:
      - $PWD/my.cnf:/etc/my.cnf
      - $PWD/mysql-cluster.cnf:/etc/mysql-cluster.cnf
    networks:
      dev_net:
        ipv4_address: 10.20.30.101
    environment:
     - MYSQL_ROOT_PASSWORD=root
    command:
      - mysqld

networks:
  dev_net:
    driver: bridge
    ipam:
      driver: default
      config:
      -
        subnet: 10.20.0.0/16
```