Till now you have learned how to create docker-compose.yml file and pushed it to the Repository. Let's move forward and dig more on other Docker-compose.yml concepts. Aaj thodi padhai krte hai on Docker Volume & Docker Network 😃
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 same data. reference
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) together. 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. If we want to share that storage space with other containers, we can't do that. reference
- Create a multi-container docker-compose file which will bring UP and bring DOWN containers in a single shot ( Example - Create application and database container )
hints:
- 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. You can also addreplicas
in deployment file for auto-scaling. - Use the
docker-compose ps
command to view the status of all containers, anddocker-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
- 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. - Verify that the data is the same in all containers by using the docker exec command to run commands inside each container.
- Use the docker volume ls command to list all volumes and docker volume rm command to remove the volume when you're done.
You can Post on LinkedIn and let us know what you have learned from this task by #90DaysOfDevOps Challange. Happy Learning :)