mongodb-replicaset-docker

Setup MongoDB in Docker Container With Replicaset

How to

Before doing step below, please configure your username or password by edit file named docker-compose.yml and ./setup/setup.sh

1. Compose first with docker-compose build or you can use docker-compose up for build & run.
2. When compose done, connect to your primary container by using this docker-compose exec mongo-rs0-1 mongo -u "root" -p "root".
3. And when mongo shell popup, you need to check is it primary or secondary by db.isMaster().
   • (a). You got some returned value, check the object value called by "ismaster" : true or "primary" : "mongo-rs0-1:27017".
   • (b). When it's in primary cluster, continue to step 4. When it's not, continue to 3b.
   • (c). To make your current cluster become primary, execute command below (one by one)
     • cfg = rs.conf();
     • cfg.members[0].priority = 2;
     • rs.reconfig(cfg);
   • (d). Now check the cluster state again, is it primary or not?
4. Create or Add user to your admin database by using this db.createUser({user: "admin",pwd: "admin",roles: [ { role: "userAdminAnyDatabase", db: "admin" }, { "role" : "clusterAdmin", "db" : "admin" } ]});
5. Now you're done :D