Introduction
If you’re trying to learn Docker you will first have to master its various terminal commands. This guide aims to help you get started with basic docker commands.
This tutorial assumes that you already have Docker installed on your system. If not, you can start here to learn how to quickly install Docker. Select a topic from the table of contents below.
Working with Docker Containers
The below commands are docker commands that can be used when working with containers. Below you will learn how to create, remove, start and stop containers.
Creating a Container
To create a simple container, use the below command and replace [IMAGE_NAME] with the name of the image you want to run. When you hit the enter key, Docker will search the Docker Hub for that image, download it to your system and create a stopped container.
docker create [IMAGE_NAME]
Creating and Running a Container
To create and run a container, use this command. As with before, replace [IMAGE_NAME] with the name of the image that you want to run. This command will search the Docker Hub for the image that you specified, download it, create a container and start that container.
docker run [IMAGE_NAME]
Starting a Stopped Container
To start a container on your system that is stopped, you can run the following command. Replace [CONTAINER_NAME] with the name or ID of the stopped container on your system that you would like to start.
docker start [CONTAINER_NAME]
Stopping a Running Container
Use this command to stop a container on your system that is running. Once the container is stopped you can start it later by running the start command. Replace [CONTAINER_NAME] with the name or ID of your running container.
docker stop [CONTAINER_NAME]
Restarting a Running Container
Occasionally you may need to restart a running container to give it a fresh start. Just replace [CONTAINER_NAME] with the name or ID of the container you would like to restart.
docker restart [CONTAINER_NAME]
Pausing a Running Container
If you need to pause the process within a running container temporarily, run the following command after replacing [CONTAINER_NAME] with the name or ID of the container that you would like to pause.
docker pause [CONTAINER_NAME]
Resuming a Paused Container
After pausing a container, you can resume a paused container by using the below command. Replace [CONTAINER_NAME] with the name or ID of the container that you need to resume.
docker unpause [CONTAINER_NAME]
List Running Containers
If you need to view a list of running containers on your system, run the below command.
docker ps
or
docker container ls
Removing a Container
In order to delete a container from your system you can run the following command. Replace [CONTAINER_NAME] with the name or ID of the container that you would like to delete.
docker rm [CONTAINER_NAME]
Working with Docker Container Images
Docker container images are files that contain the operating system, application and initial state of a docker container. They can be built from Dockerfiles or created from containers that you already have running. The following docker commands will help you get started working with container images.
Building an Image from a Dockerfile
A dockerfile is a list of commands that docker uses to create and build a container image. You can build an image from a dockerfile by running the below command. Repace [DOCKERFILE_PATH] with the URL to the dockerfile you would like to build from.
docker build -f [DOCKERFILE_PATH]
Building an Image from a Container
You can also build an image from a running container. This is a quick to take a backup snapshot of a container that you are working with. Replace [CONTAINER_NAME] with the name of the container that you would like to create an image from. Replace [IMAGE_NAME] with the image name you would like to use for the newly created image.
docker commit [CONTAINER_NAME] [IMAGE_NAME]
Pulling an Image from the Docker Hub
Use the below command to download an image from the Docker Hub to your system. Replace [IMAGE_NAME] with the name of the image used on the hub.
docker image pull [IMAGE_NAME]
Pushing an Image to the Docker Hub
Before you push a container image to the docker hub, you must create an account at the docker hub and login from your terminal. Once you have your account ready, run the following command in your terminal:
docker login
You will then be asked for your docker hub username and password. Once you are logged in, you can push an image to the hub by using the following command. Replace [IMAGE_NAME] with the name of the image that you would like to push.
docker image push [IMAGE_NAME]
List Container Images
If you need to view a list of images on your system, run the following command:
docker image ls
or
docker images
Deleting an Image from your System
If you would like to remove an image from your system, use the following command, replacing [IMAGE_NAME] with the image name you would like to delete.
docker image remove [IMAGE_NAME]
Working with Docker Volumes
Attaching Docker Volumes to containers via the docker run, or docker create commands will allow some of the data in your container to persist across image rebuilds. The following docker commands will help you get started with working with docker volumes.
Create a Docker Volume
To create a docker volume run the following command. Replace [VOLUME_NAME] with what you want to call your new volume.
docker volume create [VOLUME_NAME]
Remove a Docker Volume
Run the below command to remove a Docker Volume. Remember, if you delete a volume, you will delete any data stored within that volume. Replace [VOLUME_NAME] with the name of the volume that you want to remove.
docker volume rm [VOLUME_NAME]
Inspect a Docker Volume
Sometimes you’ll need to view various details about a volume that you created. You can see those details by running the below command and replacing [VOLUME_NAME] with the name of the volume you would like to inspect.
docker volume inspect [VOLUME_NAME]
List all Docker Volumes
If you need to view a list of all of the volumes on your system, you can type type the below command in terminal:
docker volume ls
Working with Docker Networks
Docker networks determine how containers connect to each other, and the internet. Private networks can be created for various software application stacks to ensure data security. The below docker commands will allow you to easily work with docker networks.
Creating a Docker Network
Tis command will create a bridge network on your system that connects containers to each other and shares the network and internet connection of the host machine. Replace [NETWORK_NAME] with the name you want your network to have.
docker network create [NETWORK_NAME]
Connecting a Container to a Network
In order to connect a container to a new network use the following command. Replace [NETWORK_NAME] with the name of the network you want to connect the container to and replace [CONTAINER_NAME] with the container that you would like to connect to the network.
docker network connect [NETWORK_NAME] [CONTAINER_NAME]
Disconnecting a Container from a Network
To disconnect a container from a network use the below command. Replace [NETWORK_NAME] with the name of the network you want to disconnect the container from and replace [CONTAINER_NAME] with the container that you would like to disconnect from the network.
docker network disconnect [NETWORK_NAME] [CONTAINER_NAME]
Inspecting a Network
If you need to inspect details on a network type the following command. Replace [NETWORK_NAME] with the name of the network that you would like to inspect.
docker network inspect [NETWORK_NAME]
Listing all Networks
The following command will list all of the networks on your system.
docker network ls
Removing a Network
To delete a network from your system. Run the following command. Replace [NETWORK_NAME] with the name of the network that you would like to delete.
docker network rm [NETWORK_NAME]
Additional Information
If you need any more help with any of these docker commands you can type append --help to the end of any of the above docker commands and type enter. If you need more information you can visit the Docker Documentation page. Remember to prune your system after working with docker in order to free up system resources.
If there are any other Docker commands you would like to see added to this post, leave a comment below.
The post 25 Docker Commands for Beginners originally appeared on codeopolis.com.
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