Setup a three node mysql innodb cluster using docker containers in any system.

To know detailed steps you can check this blog - Setting Mysql cluster using docker

Below are few steps to run the files present , detailed explanation and steps are present in this blog Setting Mysql cluster using docker

• Start the docker containers

docker-compose up
or
docker-compose up -d

• Check if three containers are running

docker ps

• In each mysql node a clusteradmin user is created with super user privileges

• To configure another user or change password modify username and password in setup.sql file

• To change root password change in compose file directly

• Login to any container as clusteradmin user

docker exec -it {container name} /bin/bash   // exec into container

mysqlsh -uclusteradmin -p'cladmin'  // Login as clusteradmin user

• Check each node if it is suitable for acting as a cluster node

dba.checkInstanceConfiguration("clusteradmin@{container name}:port")

replace container name with all three containers names , this can be run from a single node as all three nodes can connect to each other

• Configure each node , this too for all three nodes

dba.configureInstance("clusteradmin@{container name}:port")

• Create the cluster from mysql shell

var cluster = dba.createCluster("{cluster name}")

• Check status of cluster

cluster.status()

• Add the two other nodes

cluster.addInstance("clusteradmin@{container name}:{port}")

• Check status of cluster again

cluster.status()