Docker Basic Commands

Commands for basic Docker operations.md

Basic Docker Commands

Below are some basic docker commands which I learnt from PIAIC Docker course by Amir Pinger. Made this gist to have all the basic commands listed together

Download docker image from docker hub

For official images : docker image pull image_name:tag For unofficial images : docker image pull username/imagename:tag

• not necessary to write image, can also do docker pull direct
• if no tag given then latest tag considered by default.

List Docker Images:

docker image ls or docker images

Remove/Delete Images :

docker image rm imagename:tag

• Images can be removed only when they have no containers in stop or running state.

Create and Run Container:

docker run -it username/imagename sh

• run : to run the container after creating it

• -it : to bring the running container in interactive mode i.e. to start its terminal on our command line.

• sh : type of terminal for interactive mode. Can also use bash instead which is another kind of terminal.

• If no name provided for container then docker will give a default name to it

• After running this command, main terminal will switch to the running containers shell.

• To exit this interactive terminal and go back to the main terminal, use exit.

Note :

• If the image doesn't exist locally, then it will be downloaded first, then its container is created.

• exit will also stop that container.

• For exiting the interactive terminal without stopping the container, use Clt+p+q.Once used this

• later if you use exit on the shell of this running container, the interactive shell will close without stopping the container.

List Running Containers:

docker container ls or docker ps

List All Containers:

docker container ls -a or docker ps -a

will list all containers in any state ( running or stop )

Start interactive terminal for a running container :

docker exec -it container_name sh or docker exec -it container_id sh

Stop Container:

docker stop container_name or docker stop container_id If container stop is successful, the container_name or container_id will be displayed.

Starting a stopped container:

docker start container_name If container start is successful, the container_name or container_id will be displayed.

Removing Container:

docker container rm container_name or docker container rm container_id

Note : container must be in stop state inorder to delete/remove it.

Custom naming container:

docker container run -it --name cont_name username/imagename sh

Publish the container on a port:

docker container run -d -p local_host_port:tcp_port username/image_name

You can see it from browser at localhost:port