Docker Commands

This Repository contain the cheatsheet for all the docker commands

1. Search an Image at Docker Hub

To search an existing image at registry.hub.docker.com/

$ docker search <image_name>
$ docker search ubuntu

2. List all the images in Host Sysyem

This command will list following details of the images in the system

    $ docker images

3. Launch a Container From Image Name

When You launch a container It eill give You a hexadecimal string, The 12 digits of that hexadecimal string is Container Unique ID

• To launch a Container from the Latest Version of Image

$ docker run <option_name> <image_name>

Note Various docker run flavor with various option

  $ # To launch an image in background -d option
  $
  $ docker run -d <image_name>
  $ docker run -d ubuntu
  
  $ # To Map Host Port To the Container Port - The port on the host is mapped to 0.0.0.0
  $
  $ docker run -p <host-port>:<container-port> <image_name>
  $
  $ # or To bind a particular Ip
  $
  $ docker run -p <ip_addr>:<host-port>:<container-port> <image_name>   
  $
  $ # or To bind random Port of Host Machine
  $
  $ docker run -p <container-port> <image_name>

  $ # To list port alloted
  $
  $ docker port -p <frinedly_name | container_id> <container_port>
  
  
  $ # To run Container with different name 
  $ docker run --name <different_name> <image_name>
  
  $ # container are designed to be build stateless, That is if You recreate a container the data will be removed 
  $ # You can bind the Host directory with Your Container directory (or volumes) This lets you persist your data
  $ docker run -v <host-dir-path>:<container-dir-path>
  $ docker run -v $PWD:<container-dir-path>
  
  $ # To use data from other docker container
  $ docker run --volume-from <container_name> <image_name>

• To launch a specific Version of the image:

    $ docker run <option_name> <image_name>:<vesion_number>
  

4. List all the container or Running Image

This command will list following information Container ID, Image, command, Created, Ports, Names(Friendly_name)

  $ docker ps

5. List Complete information of the Container

   $ docker inspect <friendly_name | container_id >

6. List Logs container printed on std out or std err

To view what was the output that a container that docker run as background, This is same as running the docker container in Foreground

   $ docker logs <friendly_name | container_id >

---

Note: Docker Container are Sanboxed, It means the host directly processes can't directly access the services running in docker. If a service running in Docker container need to be accessed by a process not running in a container, then the port needs to be exposed via the Host. This can be done either in the Dockerfile or the way as shown in 2 )

---

7. Docker Build Image

Before reading this command read, How to Write Dockerfile? You can create a Docker Image From a Dockerfile using this command

     $ docker build -t <image_name>:<tag or version_number> <build_destination_folder>

8. Remove an image

Note: You can remove an image only and only if the image has no referenced container, until you pass the forcefully command

  $ docker rmi <image_id | friendly_name>

9. Delete Container

Note: You can remove an image only and only if the image has no referenced container

  $ docker kill <image_id | friendly_name>

10. Remove Errored image and container

  $ docker system prune

11. Docker Create Command

Docker create command is used to create a new container(generally data container).

  $ docker create <option_name> <image> <command_optional> <arguments>
  $ docker create -v /data --name my_data_container ubuntu

12. Docker cp command

It is a two way copy command it copies the data from src to destination as mentioned below.

  $ docker cp <options_name> <container>:<src_in_container> <dest_path> or <->
  $ docker cp <option_name> <src_in_system> or <-> <container>:<dest_path>

13. Docker export

To export a container in tar format

  $ docker export <option_name> <container_name>
  $ docker export --output="file.tar" <container_name>
  $ docker export <container_name> > file.tar
  

14. Docker import

To export a container in tar format

  $ docker export <option_name> <container_name>
  $ docker export --output="file.tar" <container_name>
  $ docker export <container_name> > file.tar