MongoDB Replicaset with Docker w/ Compass Connectivity

gistfile1.txt

---First, make sure Docker networking is set up---
docker network create my-mongo-cluster  
docker network ls

---Now, run the containers ---
docker run -d -p 3001:3001 --name mongo1 --net my-mongo-cluster mongo mongod --replSet my-mongo-rs --port 3001
docker run -d -p 3002:3002 --name mongo2 --net my-mongo-cluster mongo mongod --replSet my-mongo-rs --port 3002
docker run -d -p 3003:3003 --name mongo3 --net my-mongo-cluster mongo mongod --replSet my-mongo-rs --port 3003

---Then, login to mongo1 ---
docker exec -it mongo1 mongo --port 3001

---FROM mongo1---
config = { "_id" : "my-mongo-rs", "members" : [ { "_id" : 0, "host" : "mongo1:3001" }, { "_id" : 1, "host" : "mongo2:3002" }, { "_id" : 2, "host" : "mongo3:3003" } ] }
rs.initiate(config)

---Make edits to /etc/hosts/ for Compass to be able to connect to the replicaset---
127.0.0.1 mongo1
127.0.0.1 mongo2
127.0.0.1 mongo3

---Flush DNS cache to make sure the /etc/hosts stuff is reflected---
sudo dscacheutil -flushcache


---Please wait enough time for the replicaSet to be initiated---
---If you run into this error:---
---"Error: couldn’t add user: not master" (https://stackoverflow.com/questions/31387053/cant-create-user)---
---Simply restart the mongo shell---
use admin
db.createUser( { user: "mongoadmin", pwd: "mongoadmin123", roles:["root"] })


---MongoDB Compass Connection String---
mongodb://mongoadmin:mongoadmin123@localhost:3001/?replicaSet=my-mongo-rs&authMechanism=DEFAULT

OPTIONAL

---CONFIRM WRITES ARE REPLICATED TO NODE---

rs.secondaryOk()

docker exec -it mongo2 mongo --port 3002

use [test_db]

db.[test_collection].find()