Day 19 Task: Docker for DevOps Engineers Part-3
Sayali Shewale
DevOps Engineer | AWS cloud Engineer | AWS DevOps | Linux | Docker | Jenkins | Terraform | Kubernetes | Ansible | Grafana
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 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) 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.
Task-1
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 )
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 add?replicas?in deployment file for?auto-scaling.
Use the?docker-compose ps?command to view the status of all containers
Use the docker-compose logs?to view the logs of a specific service.
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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.
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
Use the docker volume rm command to remove the volume when you're done
Thank you for taking time to read this article!