RiccardoCurcio/Mongo-replica-set

Docker - Mongo replica set

mongo-replica-set

docker mongo replica set on the same server

create .env file in node1, node2 and node3

$ cp .env.example_node1 node1/.env
$ cp .env.example_node2 node2/.env
$ cp .env.example_node3 node3/.env

Create a key file

$ openssl rand -base64 741 > mongodb-keyfile
$ chmod 600 mongodb-keyfile
$ sudo chown 999 mongodb-keyfile

Copy key to the other nodes

$ cp mongodb-keyfile node1/key
$ cp mongodb-keyfile node2/key
$ cp mongodb-keyfile node3/key

Edit docker-compose.yml on node1

$ cd node1

change line 20

command: mongod --keyFile /opt/keyfile/mongodb-keyfile --replSet "rs0"

to

command: mongod

Start node1 and create users

$ docker-compose build --no-cache
$ docker-compose up
$ docker exec -it node1.clustermongo.local bash

root@node1:/# mongosh

> use admin
> db.createUser( {user: "userAdmin", pwd: "password", roles: [ { role: "userAdminAnyDatabase", db: "admin" } ] });
> db.createUser( {user: "rootAdmin", pwd: "password", roles: [ { role: "root", db: "admin" } ] });
> exit;

Stop container and remove container by id

$ docker-compose stop
$ docker rm container-id

Edit docker-compose.yml on node1

change line 20

command: mongod

to

command: mongod --keyFile /opt/keyfile/mongodb-keyfile --replSet "rs0"

Build and start node1

$ docker-compose build --no-cache
$ docker-compose up
$ docker exec -it node1.clustermongo.local bash

root@node1:/# mongosh

> use admin
> db.auth("rootAdmin", "password");
> rs.initiate()

Start node2 and node3 and return in node1

> rs.add("node2.clustermongo.local")
> rs.add("node2.clustermongo.local")

Edit /etc/hosts and insert this line (only if the nodes reside on the same server)

127.0.0.1	node1.clustermongo.local node2.clustermongo.local node3.clustermongo.local