Day 19: Docker Networking for DevOps.

Till now you have learned how to create a docker-compose.yml file and pushed it to the Repository. Let's move forward and dig more into other Docker-compose.yml concepts.

Today we will learn Docker Volume & Docker Network.

Docker-Volume :

• Docker allows you to create something called volumes. Volumes are like separate storage areas that can be accessed by containers. They allow you to store data, like a database, outside the container, so it doesn't get deleted when the container is deleted.

• You can also mount from the same volume and create more containers having the same data.

Docker Network:

• Docker allows you to create virtual spaces called networks, where you can connect multiple containers (small packages that hold all the necessary files for a specific application to run). This way, the containers can communicate with each other and with the host machine (the computer on which the Docker is installed).

• When we run a container, it has its own storage space that is only accessible by that specific container.

---

Task-1:

• Create a multi-container docker-compose file that will bring UP and bring DOWN containers in a single shot ( Example - Create application and database container )

• Use the docker-compose up command with the -d flag to start a multi-container application in detached mode.

• Use the docker-compose scale command to increase or decrease the number of replicas for a specific service.

• Use the docker-compose ps command to view the status of all containers, and docker-compose logs to view the logs of a specific service.

• Use the docker-compose down command to stop and remove all containers, networks, and volumes associated with the application

---

Task-2:

• Learn how to use Docker Volumes and Named Volumes to share files and directories between multiple containers.

• Create two or more containers that read and write data to the same volume using the docker run --mount command.

• Use the docker volume ls command to list all volumes and the docker volume rm command to remove the volume when you're done.

• We can verify the volumes are connected are not and running on the required port.

---

Happy Learning :)