Docker commands (part-1)

#devops #docker #networking #containers

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.

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. ` ---
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