MongoDB cluster minimize

• Config Server: configsvr01
• 2 Shards (each a 2 member PSS replica set):
  • shard01-a,shard01-b, shard01-c
  • shard02-a,shard02-b, shard02-c
• 1 Routers (mongos): router01

👉 Step 1

docker-compose up -d

👉 Step 2

docker-compose exec configsvr01 sh -c "mongosh < /scripts/init-configserver.js"

docker-compose exec shard01-a sh -c "mongosh < /scripts/init-shard01.js"
docker-compose exec shard02-a sh -c "mongosh < /scripts/init-shard02.js"

👉 Step 3

Note: Wait a bit for the config server and shards to elect their primaries before initializing the router

docker-compose exec router01 sh -c "mongosh < /scripts/init-router.js"

👉 Step 4

docker-compose exec router01 mongosh --port 27017

// Enable sharding for database `MyDatabase`
sh.enableSharding("MyDatabase")

// Setup shardingKey for collection `MyCollection`**
db.adminCommand( { shardCollection: "MyDatabase.MyCollection", key: { oemNumber: "hashed", zipCode: 1, supplierId: 1 } } )

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✔️ Done !!!

But before you start inserting data you should verify them first

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!!! If you want to add new shard to existed cluster, check more here

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📋 Verify 🔝

✅ Verify the status of the sharded cluster 🔝

docker-compose exec router01 mongosh --port 27017
sh.status()

✅ Verify status of replica set for each shard 🔝

You should see 1 PRIMARY, 2 SECONDARY

docker exec -it shard-01-node-a bash -c "echo 'rs.status()' | mongosh --port 27017" 
docker exec -it shard-02-node-a bash -c "echo 'rs.status()' | mongosh --port 27017" 

✅ Check database status

docker-compose exec router01 mongosh --port 27017
use MyDatabase
db.stats()
db.MyCollection.getShardDistribution()

🔎 More commands

docker exec -it mongo-config-01 bash -c "echo 'rs.status()' | mongosh --port 27017"


docker exec -it shard-01-node-a bash -c "echo 'rs.help()' | mongosh --port 27017"
docker exec -it shard-01-node-a bash -c "echo 'rs.status()' | mongosh --port 27017" 
docker exec -it shard-01-node-a bash -c "echo 'rs.printReplicationInfo()' | mongosh --port 27017" 
docker exec -it shard-01-node-a bash -c "echo 'rs.printSlaveReplicationInfo()' | mongosh --port 27017"