#Day20: Docker Cheat sheet for DevOps Engineers.

Docker is a powerful tool in DevOps workflows. Here's a set of detailed commands that cover various aspects of using Docker in a DevOps context:

1. Working with Images:

Pull an Image:
```
  docker pull image-name:tag
```

Build an Image from Dockerfile:

  docker build -t image-name:tag path/to/Dockerfile-directory

List Images:
```
  docker images
```
Remove an Image:
```
  docker rmi image-id
```

2. Running Containers:

Run a Container:
```
  docker run -it image-name:tag
```
Run a Detached Container:
```
  docker run -d image-name:tag
```

Run with Port Mapping:

  docker run -p host-port:container-port image-name:tag

Run with Environment Variables:

  docker run -e VARIABLE_NAME=value image-name:tag

3. Container Management:

List Running Containers:
```
  docker ps
```
List All Containers (including stopped):
```
  docker ps -a
```
Start a Stopped Container:
```
  docker start container-id
```
Stop a Running Container:
```
  docker stop container-id
```
Restart a Container:
```
  docker restart container-id
```
Remove a Container:
```
  docker rm container-id
```

4. Networking:

Create a Custom Network:
```
  docker network create network-name
```

Run a Container on a Specific Network:

  docker run --network network-name image-name:tag

5. Volumes:

Create a Volume:
```
  docker volume create volume-name
```

Run a Container with a Volume:

  docker run -v volume-name:/path/in/container image-name:tag

6. Docker Compose:

Run Services Defined in docker-compose.yml:
```
  docker-compose up
```
Stop and Remove Services:
```
  docker-compose down
```

7. System Cleanup:

Prune Unused Resources:
```
  docker system prune
```
Remove All Stopped Containers:
```
  docker container prune
```
Remove Dangling Images:
```
  docker image prune
```

Remember that these commands provide a solid foundation for using Docker in a DevOps environment. As your requirements evolve, you might need to explore more advanced Docker features and workflows to optimize your DevOps processes.