Docker Commands (part-1)

Beginner Commands:

• docker --version

  • Check the Docker version installed on your system.

  • Example: docker --version

• docker pull <image>

  • Download a Docker image from Docker Hub.

  • Example: docker pull ubuntu

• docker build -t <tag> <path>

  • Build a Docker image from a Dockerfile located at a specified path.

  • Example: docker build -t myimage .

• docker images

  • List all locally stored Docker images.

  • Example: docker images

• docker rmi <my_image/id> - Remove an image - Example: docker rmi ubuntu

• docker ps

  • List running containers.

  • Example: docker ps

• docker ps -a

  • List all containers (including stopped ones).

  • Example: ``docker ps -a

• docker run <image>

  • Run a container from a specified image.

  • Example: docker run ubuntu

• docker run -d <image_nam/id>

  • Run a container in detached mode (background). #usethis beacause without -d powershell getting error

  • Example: ``docker run -d ubuntu

• docker run --name <container_name> <image_name>

  • Run container with specific name

  • Example: docker run --name mycontainer nginx

  • It will create container named mycontainer with base image of nginx

• docker run -it --name mycont nginx bash

  • Runs container named mycont with base image nginx and also gives bash shell(command prompt inside container)

• docker run -p <host_port>:<container_port> <image_name>

  • Example:docker run -p 8080:80 nginx

  • This runs an Nginx container and maps port 8080 on the host to port 80 inside the container.

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#bestway -best way to launch container of nginx or any other

• docker run -d -p 8080:80 --name myweb nginx

  • run an Nginx container in detached mode and expose port 80 from the container to port 8080 on the host.

• `docker run -it -p 8080:80 --name myweb nginx bash

  • This will start the Nginx container but override the default entry point (which is Nginx) with a bash shell instead, allowing you to interact with the container's file system or run commands inside it. `

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• docker exec -it <container_id> <command>

  • Run commands inside a running container.

  • Example: docker exec -it mycontainer bash

  • This command open up interactive bash terminal inside container

• docker stop <container_id>

  • Stop a running container.

  • Example: docker stop mycontainer

• `docker stop

  • Stop multiple containers at once:

  • Example:docker stop cont1 cont2 1233aec2 (with name or id)

• docker stop $(docker ps -q)

  • docker ps -q lists all the running container IDs, and docker stop stops them

• docker rm $(docker ps -a -q)

  • Remove All Containers: Once the containers are stopped, you can remove them with this command

• docker rm <container_id>

  • Remove a stopped container.

  • Example: docker rm mycontainer

• docker rmi $(docker images -q)

  • To remove all Docker images from your system:

• docker rmi -f <image_id_or_name>

  • To remove an image that is currently being used by a container, you would typically encounter an error because Docker prevents you from removing an image that’s being used.

• docker rm -f <container_id_or_name>

  • remove a running container, you can't do so directly without stopping it first so we use -f/--force