I have some doubts, how the MongoDB data persisted? Is it automatic or we need to add any specific command or key in the files? Do we not loose data if we remove a container? Or does it happen when we delete the image of MongoDB?
Thanks a lot! Yes it’s been a while since the last video. I was too busy with my studies. Hopefully I can continue to upload more videos again. Thanks again for staying with the channel. ❤
I'm glad you came up with this confusion. When you run containers, the containers are connected to a default bridge network. In this default bridge network, containers can communicate with each other, even if the ports are not explicitly exposed to the outside world. In your scenario, the Node.js application container and the MongoDB container are on the same default bridge network created by Docker Compose. Since they are on the same network, the Node.js container can reach the MongoDB container without needing to expose the MongoDB port (27017) to the host machine or the external network. Containers connected to the same bridge network can communicate with each other over their internal IP addresses or container names. Docker Compose automatically assigns a container name as a hostname that can be used for communication within the network. If you want to access the MongoDB container from outside (Eg: See the tables with Compass or any database client) the Docker network or from the host machine, you would need to expose the MongoDB port in the docker-compose.yml file. Hope that helps!
