Docker cheat-sheet

 

Docker Image: 

We can download any docker image from Docker Hub using the below command. By default, it will download the image with the "latest" tag. 

$ sudo docker pull $image_name

To download an image with a specific tag use the below command.

$ sudo docker pull $image_name:$tag

To list all the images available on your local machine, run any of the below commands.

$ sudo docker images

$ sudo docker image ls

To show all the configurations of an image, use the below command.

$ sudo docker image inspect $image_name

$ sudo docker image inspect $image_name:$tag

To delete a docker image from local.

$ sudo docker image rm $image_name:$tag

To start a docker container from an image.

$ sudo docker container run $image_name:$tag

If the given image is not available on the machine, docker will first pull the image from the registry and then it starts the container.

To list the running containers on the Docker engine, run any of the below commands.

$ sudo docker container ls

$ sudo docker container ps

To list all the containers on the Docker engine, run any of the below commands.

$ sudo docker container ls -a

$ sudo docker container ps -a

To stop the docker container

$ sudo docker container stop $container_name/$container_id

To start the docker container.

$ sudo docker container start $container_name/$container_id

To show the process table running inside a container.

$ sudo docker container top

To show all the configurations of a container.

$ sudo docker container inspect $container_name/$container_id

To get the streaming view of the CPU, RAM, Memory of each container.

$ sudo docker container stats

To start the container with a specified name use the "--name" parameter

$ sudo  docker container run --name $your_container_name $any_image 

To start the container and keep it live, To interact with the container give the option " -it " and give the command  "/bin/bash". This will open an interactive shell and we will be logged into the container.

$ sudo  docker container run -it --name $your_container_name $any_image /bin/bash

To run a command on the running container use the "exec" option.

$ sudo  docker container exec $containerID $command_to_run 

To open an additional shell in the container without making changes to the first process on a running container.

$ sudo  docker container exec -it $containerID bash

To show the latest logs of a container.

$ sudo  docker container logs $containerID

To show the running logs from the beginning use the "-f" option and use "-t" option to show the timestamp.

$ sudo  docker container logs $container_ID -ft

Here we are using the "-p" or "--publish" option for port forwarding. "-p LocalPort:ContainerPort". ContainerPort will be the port on which the service is running.

$ sudo  docker docker run -p 9080:8080 jenkins

Here we are using the "--detach" or "-d" option to detach the process from the terminal and run in the background.

$ sudo  docker container run --publish 80:80 --detach --name mycontainernginx nginx

Remove or delete a container using the below command. we can delete multiple containers at once.

$ sudo  docker container rm $containerID

$ sudo  docker container rm $containerID1 $containerID2 $containerID3

To show all the Networks, use the below command.

$ sudo docker network ls

To show all the config of a specific Network, use the below command.

$ sudo docker network inspect

To create a new Network, use the below command.

$ sudo docker network create $network_name

To attach a Network to a container, use the below command.

$ sudo docker network connect $network_name $container_ID

To detach a Network from a container, use the below command.

$ sudo docker network disconnect $network_name $container_ID

Here "--rm" option will remove the container as soon as the terminal is closed.

$ sudo docker container exec --rm --it centos:7 bash

To build an image from a Dockerfile use the below command.

$ sudo docker image build -t $account_name/$image_name:$tag $path_of_Dockerfile