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Ömer Berat Sezer
Ömer Berat Sezer

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Top 20 Docker Commands with Examples and Outputs

#docker #tutorial #devops #webdev

Docker commands are essential for managing containerized applications, enabling developers to create, run, and manage containers efficiently. They allow for consistent environments across development, testing, and production, ensuring reliable deployment and scalability. Mastery of these commands simplifies workflow automation and boosts productivity in DevOps practices.

Docker

Important Docker commands with their outputs:

docker pull

  • downloads an image from Docker registry 
user@docker:$ docker pull nginx:latest # download latest tag Using default tag: latest latest: Pulling from library/nginx a480a496ba95: Pull complete Digest: sha256:28402db69fec7c17e179ea87882667 Status: Downloaded newer image for nginx:latest docker.o/library/nginx:latest
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docker run

  • runs a container from an image 
user@docker:$ docker run -d -p 8080:80 nginx:latest # -d => run in detach mode (background) # -p => publish port <host>:<container> 8f9f97dc08ffddb173ebe61eaa871b2944
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docker ps

  • lists all running containers 
user@docker:$ docker ps user@docker:$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS 8f9f97dc08ff nginx:latest "/docker-entrypoint" 2 minutes ago Up 2 minutes
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docker images

  • lists all downloaded images 
user@docker:$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest 3b25b682ea82 4 weeks ago 192MB
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docker rm

  • removes a stopped container 
user@docker:$ docker container rm -f my_container 8f9 user@docker:$ docker image rm -f nginx # force to delete image Untagged: nginx:latest Untagged: nginx@sha256:28402db69fec7c17e179ea8788266 Deleted: sha256:3b25b682ea82b2db3cc4fd48db818be788ee Deleted: sha256:3e8a4396bcdb62aeb916ec1e4cf645000380
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docker rmi

  • removes a specific image 
user@docker:$ docker rmi nginx Untagged: nginx:latest Untagged: nginx@sha256:28402db69fec7c17e179ea8788266 Deleted: sha256:3b25b682ea82b2db3cc4fd48db818be788ee Deleted: sha256:3e8a4396bcdb62aeb916ec1e4cf645000380
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docker exec

  • runs a command inside a running container 
user@docker:$ docker exec -it my_container bash user@docker:$ docker exec -it my_container bin/sh # pwd / # read escape sequence # CTRL + P + Q => go to host user@docker:$
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docker build

  • builds an image from a Dockerfile 
user@docker:$ docker build -t myapp . # if Dockerfile in the same directory user@docker:$ docker build -t myapp -f /other-directory/Dockerfile . # if Dockerfile in the different directory path
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docker logs

  • shows logs from a container 
user@docker:$ docker logs my_container 2024/11/01 21:20:08 [notice] 1#1: nginx/1.27.2 2024/11/01 21:20:08 [notice] 1#1: built by gcc 12.2.0 (Debian 12.2.0-14) 2024/11/01 21:20:08 [notice] 1#1: OS: Linux 5.10.60.1
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docker network ls

  • lists all networks 
user@docker:$ docker network ls NETWORK ID NAME DRIVER SCOPE 19cb6e2b2cab bridge bridge local 8ab407104066 host host local 67944d3050a3 none null local
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docker volume ls

  • lists all volumes 
user@docker:$ docker volume ls DRIVER VOLUME NAME local 3a243556537e4e11 local myvolume
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docker login

  • login dockerhub or docker registry 
user@docker:$ docker login Login with your Docker ID to push and pull images from Docker Hub. Username: Password:
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docker tag

  • creates a new tag for an image, useful for renaming or versioning 
user@docker:$ docker tag nginx:latest my_nginx:latest REPOSITORY TAG IMAGE ID CREATED SIZE my_nginx latest 3b25b682ea82 4 weeks ago 192MB nginx latest 3b25b682ea82 4 weeks ago 192MB
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docker push

  • uploads an image to Docker Hub or another Docker registry 
user@docker:$ docker push <my_username>/my_nginx The push refers to repository [docker.io/<my_username>/my_nginx] e4e9e9ad93c2: Mounted from library/nginx latest: digest: sha256:7ba542bde95e6523a4b126f610 size: 1778
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docker save

  • saves a Docker image as a .tar archive 
user@docker:$ docker save -o <imageName>.tar <imageName> user@docker:$ docker save -o my_nginx.tar my_nginx user@docker:$  ls my_nginx.tar
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docker load

  • loads an image from a .tar archive 
user@docker:$ docker load -i my_image.tar user@docker:$ docker load -i my_nginx.tar Loaded image: my_nginx:latest
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docker stats

  • displays real-time resource usage statistics for containers 
user@docker:$ docker stats CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
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docker-compose up

  • starts and runs all services defined in a docker-compose.yml file 
user@docker:$ docker-compose up -d # -d => run detach mode, background
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docker-compose down

  • stops and removes all services and networks created by docker-compose up 
user@docker:$ docker-compose down
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docker system prune

  • cleans up unused containers, images, networks, and volumes 
user@docker:$ docker system prune user@docker:$ docker system prune -a WARNING! This will remove: - all stopped containers - all networks not used by at least one container - all images without at least one container associated to them - all build cache Are you sure you want to continue? [y/N] y Deleted Containers: 94eabb9dd32f55061bc3d6
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Conclusion

We run and saw the 20 Important Docker commands with their outputs in the shell. These commands always help you while creating, debugging, implementing.

If you found the tutorial interesting, I’d love to hear your thoughts in the blog post comments. Feel free to share your reactions or leave a comment. I truly value your input and engagement 😉

For other posts 👉 https://dev.to/omerberatsezer 🧐

omerberatsezer

Docker Tutorial and Easy Guide to Master Dockerfile, Images, Containers, Commands, Volume, Network, Compose File

Ömer Berat Sezer ・ Jan 12

#docker #tutorial #beginners #webdev

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