{"id":2273,"date":"2022-07-21T14:42:04","date_gmt":"2022-07-21T14:42:04","guid":{"rendered":"https:\/\/www.checkmateq.com\/blog\/?p=2273"},"modified":"2023-08-06T14:35:20","modified_gmt":"2023-08-06T14:35:20","slug":"docker-commands","status":"publish","type":"post","link":"https:\/\/www.checkmateq.com\/blog\/docker-commands","title":{"rendered":"Top 20 Docker commands you should know"},"content":{"rendered":"

Docker<\/strong> is an open-source containerization platform<\/strong> that enables developers<\/a> to build, deploy, run, update, and manage containers.<\/p>\n

Containers are standardized, executable components that combine application source code with the operating system (OS) libraries and dependencies<\/strong> necessary to run that code in any environment.<\/p>\n

To manage containers we make use of the command line interface<\/a><\/strong>. In this blog, we will see the important commands required to manage our containers.<\/p>\n

1.\u00a0 docker info<\/strong><\/p>\n

This command display system information.<\/p>\n

Usage: docker info<\/code><\/p>\n

\"docker\"<\/p>\n

2. docker version<\/strong><\/p>\n

This command displays the version information.<\/p>\n

Usage: docker version [<\/span>OPTIONS]<\/code><\/p>\n

\"docker\"<\/p>\n

3.\u00a0 docker pull<\/strong><\/p>\n

This command is used to pull an image or a repository from the registry.<\/p>\n

Usage: docker pull [<\/span>OPTIONS] IMAGE_NAME[:TAG]<\/code><\/p>\n

\"docker\"<\/p>\n

By default, this command pulls images from the registry. If you have set up a local repository, you can specify its path to pull images. A registry path is like a URL but does not contain a protocol specifier (https:\/\/).<\/p>\n

 docker pull myregistry.local:5000\/testing\/test-image <\/code><\/pre>\n
4. docker images<\/strong><\/p>\n
This command shows images, tags, and their size.<\/p>\n
Usage: docker images [<\/span>OPTIONS] [<\/span>REPOSITORY[:TAG]]<\/code><\/p>\n
\"docker\"<\/p>\n
5. docker run\u00a0<\/strong><\/p>\n
This command is used for creating the container and then starting it.<\/p>\n
Usage:\u00a0 docker run [<\/span>OPTIONS] IMAGE [<\/span>COMMAND] [<\/span>ARG...]<\/code><\/p>\n
\"\"<\/p>\n
In the above example the -d flag <\/strong>is used for running the container in the background or in detached mode. The -p flag<\/strong> is used for port mapping. We have mapped port 80 of the container to port 80 of local host so that we can access our web application from the local host. The\u00a0 –name flag<\/strong> is used for assigning a name to the container.<\/p>\n
6. docker ps<\/strong><\/p>\n
This command is used for listing all running containers.<\/p>\n
Usage: docker ps [<\/span>OPTIONS]<\/code><\/p>\n
\"\"<\/p>\n
Use -a flag\u00a0<\/strong>to list both running and stopped containers.<\/p>\n
\"docker\"<\/p>\n
7. docker stop\u00a0<\/strong>and start<\/strong><\/p>\n
The docker stop<\/strong> command is used to stop one or more running containers.<\/p>\n
Usage: docker stop [<\/span>OPTIONS] CONTAINER [<\/span>CONTAINER...]<\/code><\/p>\n
We can use either container ID or container name to stop it.<\/p>\n
\"docker\"<\/p>\n
Similarly, we can use\u00a0start<\/strong> to start one or more containers.<\/p>\n
Usage: docker start [<\/span>OPTIONS] CONTAINER [<\/span>CONTAINER...]<\/code><\/p>\n
\"docker\"<\/p>\n
8. docker rm<\/strong><\/p>\n
This command is used to remove one or more containers.<\/p>\n
Usage: docker rm<\/span> [<\/span>OPTIONS] CONTAINER [<\/span>CONTAINER...]<\/code><\/p>\n
Before removing a container we need to stop it. A running container cannot be removed.<\/p>\n
\"docker\"<\/p>\n
9. docker rmi<\/strong><\/p>\n
This command is used to remove one or more images.<\/p>\n
Usage: docker rmi [<\/span>OPTIONS] IMAGE [<\/span>IMAGE...]<\/code><\/p>\n
\"docker\"<\/p>\n
In the above example, we have removed two images flaskapp<\/strong> and webapp<\/strong> with one command.<\/p>\n
10. docker logs<\/strong><\/p>\n
This command is used for fetching the logs of a container.<\/p>\n
Usage:\u00a0 docker logs [<\/span>OPTIONS] CONTAINER<\/code><\/p>\n
\"docker\"<\/p>\n
11. docker exec\u00a0<\/strong><\/p>\n
This command is used for executing a command in a running container.<\/p>\n
Usage:\u00a0 docker exec<\/span> [<\/span>OPTIONS] CONTAINER COMMAND [<\/span>ARG...]<\/code><\/p>\n
\"docker\"<\/p>\n
In the above example, with the first command, we create a directory \/home\/chkmt<\/strong> inside our container. With the second command, we created a bash session in our container, using which we can go inside the directory that we created.<\/p>\n
12. docker inspect<\/strong><\/p>\n
This command displays detailed information about objects like containers or images.<\/p>\n
Usage: docker inspect [<\/span>OPTIONS] NAME|ID [<\/span>NAME|ID...]<\/code><\/p>\n
\"docker\"<\/p>\n
In the above example, we used inspect<\/strong> command to get detailed information about an image. Similarly, it can be used with other docker objects like containers<\/strong>, networks<\/strong>, or volume<\/strong>.<\/p>\n
13. docker cp<\/strong><\/p>\n
This command is used for copying files between the container and the local filesystem.<\/p>\n
Usage(container to local system): docker cp<\/span> [<\/span>OPTIONS] CONTAINER:SRC_PATH DEST_PATH<\/code>
\nUsage(local system to container): docker cp<\/span> [<\/span>OPTIONS] SRC_PATH CONTAINER:DEST_PATH<\/code><\/p>\n
We will copy a file from our local system to a container named java-app. We can use the\u00a0exec<\/strong> command to confirm if the file is copied.<\/p>\n
\"docker\"<\/p>\n
Similarly, we can copy files from the container to the local system.<\/p>\n
14. docker volume create<\/strong><\/p>\n
This command is used for creating volumes that can be used for data persistence.<\/p>\n
Usage: docker volume create [<\/span>OPTIONS] [<\/span>VOLUME]<\/code><\/p>\n
\"docker\"<\/p>\n
Now, we can mount this volume to a container so that even if our container gets deleted, our data will remain safe. We can use -v flag<\/strong> with the docker run command to mount the volume.<\/p>\n
\"\"<\/p>\n
To delete the volume you can use the following command.<\/p>\n
docker volume rm<\/span> [<\/span>OPTIONS] VOLUME [<\/span>VOLUME...]<\/code><\/p>\n
15. docker network<\/strong><\/p>\n
To list the networks use the following command.<\/p>\n
docker network ls<\/span> [<\/span>OPTIONS]<\/code><\/p>\n
\"docker\"<\/p>\n
To create a network use the following command.<\/p>\n
 docker network create [<\/span>OPTIONS] NETWORK<\/code><\/p>\n
\"docker\"<\/p>\n
To connect a container to a network use the following command.<\/p>\n
docker network connect [<\/span>OPTIONS] NETWORK CONTAINER<\/code><\/p>\n
\"\"
\n\"docker\"<\/p>\n
16. docker build<\/strong><\/p>\n
This command is used to build an image from a Dockerfile<\/strong>.<\/p>\n
Usage: docker build [<\/span>OPTIONS] PATH <\/code><\/p>\n
\"docker\"<\/p>\n
In the above example, we navigated to the directory where our Dockerfile is present and used the\u00a0 build command to build an image.<\/p>\n
We can use the -t flag<\/strong> to give a tag to the image.<\/p>\n
\"docker\"<\/p>\n
17. docker login\u00a0<\/strong><\/p>\n
This command is used to login into the repository. You can log in to your local repository as well. The default repository is the docker hub.<\/p>\n
Usage:\u00a0 docker login [<\/span>OPTIONS] [<\/span>SERVER]<\/code><\/p>\n
\"\"<\/p>\n
18. docker push\u00a0<\/strong><\/p>\n
This command is used to push images to the registry.<\/p>\n
Usage:\u00a0 docker login [<\/span>OPTIONS] [<\/span>SERVER]<\/code><\/p>\n
\"\"<\/p>\n
19. docker system<\/strong><\/p>\n
Use the following command to get disk usage.<\/p>\n
docker system df<\/span> <\/code><\/p>\n
\"\"<\/p>\n
Use the following command to remove unused containers, images, and networks.<\/p>\n
docker system prune <\/code><\/p>\n
\"\"<\/p>\n
20. docker commit<\/strong><\/p>\n
This command is used to create an image from the container changes. It can be used to commit a container\u2019s file changes or settings into a new image.<\/p>\n
Usage: docker commit [<\/span>OPTIONS] CONTAINER [<\/span>REPOSITORY[:TAG]]<\/code><\/p>\n
\"docker\"<\/p>\n
Please contact<\/a> our technical consultants to learn cloud<\/a> DevOps Infrastructure best practices to ensure stable production operation and faster go to market for product.<\/p>\n","protected":false},"excerpt":{"rendered":"
Docker is an open-source containerization platform that enables developers to build, deploy, run, update, and manage containers. Containers are standardized, executable components that combine application source code with the operating system (OS) libraries and dependencies necessary to run that code in any environment. To manage containers we make use of the command line interface. In … Continue reading “Top 20 Docker commands you should know”<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":2324,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[3,2,71,70,69,68,11],"_links":{"self":[{"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/posts\/2273"}],"collection":[{"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/comments?post=2273"}],"version-history":[{"count":46,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/posts\/2273\/revisions"}],"predecessor-version":[{"id":4269,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/posts\/2273\/revisions\/4269"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/media\/2324"}],"wp:attachment":[{"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/media?parent=2273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/categories?post=2273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.checkmateq.com\/blog\/wp-json\/wp\/v2\/tags?post=2273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}