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MongoDB Cluster with Docker Compose

A simple mongodb cluster with 1 config server, 2 shard servers and 1 router.

Preparation

Generate keyfile for replica set.

openssl rand -base64 741 > ./data/replica-keyfile
chmod 600 ./data/replica-keyfile

Installation

First of all, comment out the --keyFile option in compose.yml.

Config Server

docker compose up -d mongodb-config-1
docker exec -it mongodb-config-1 mongosh

Init replica set in config server.

rs.initiate({
  _id: "config_rs",
  configsvr: true,
  members: [
    { _id : 0, host : "192.168.1.38:30101" },
  ]
})
rs.status()

Add superuser to config server in admin database.

docker exec -it mongodb-config-1 mongosh
use admin
db.createUser({
  user: "root",
  pwd: "password",
  roles: [{"role":"root","db":"admin"}],
})

Uncomment the --keyFile option in compose.yml and restart config server.

Router and Shards

docker compose up -d

For each shard

Init replica set in shard server.

// on mongodb-shard-1
rs.initiate({
  _id: "shard1_rs",
  members: [
    { _id : 0, host : "192.168.1.38:30201" },
  ]
})

Add shard to router.

// on mongodb-router
sh.addShard("shard1_rs/192.168.1.38:30201")

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