Docker handson- The ops perspective

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Check docker version
```
    docker version
```
Check for existing docker images
```
    docker images
```
Copy new image onto your “docker host”
```
    docker pull <image-name>
```
Start a container from the pulled image
```
    docker run --name <container-name> -d -p 8080:80 <image-name>
```
-d to start container in background -p 8080:80 Map port 80 inside container with port 8080 inside docker host
Check which containers are running
```
    docker ps
```
Execute a command inside the container
```
    docker exec -it <container-name bash
```
Here we can run a limited set of linux command only as most containers only ship with essential apps and tools to keep them small.
Exit from container shell
```
   exit
```
Delete the container and image(cleanup)
```
    docker stop <container-name>
    docker ps -a
    docker rm <container-name>
    docker ps -a
```
The -a option of the ps command shows the container entry after stopping it. The same entry disappears once you remove it using the docker rm command.

This is a typical sequence of commands executed in a docker container lifecycle from an operational engineer’s perspective

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