Docker Commands

This tutorial lists and provides examples for all docker commands.

Quick list of Docker Commands

  • docker version   – Echoes Client’s and Server’s Version of Docker
  • docker images   – List all Docker images
  • docker build <image>   – Builds an image form a Docker file
  • docker save <path> <image>   – Saves Docker image to .tar file specified by path
  • docker run   – Runs a command in a new container.
  • docker start   – Starts one or more stopped containers
  • docker stop <container_id>   – Stops container
  • docker rmi <image>   – Removes Docker image
  • docker rm <container_id>   – Removes Container
  • docker pull   – Pulls an image or a repository from a registry
  • docker push   – Pushes an image or a repository to a registry
  • docker export   – Exports a container’s filesystem as a tar archive
  • docker exec   – Runs a command in a run-time container
  • docker ps   – Show running containers
  • docker ps -a   – Show all containers
  • docker ps -l   – Show latest created container
  • docker search   – Searches the Docker Hub for images
  • docker attach   – Attaches to a running container
  • docker commit   – Creates a new image from a container’s changes

Docker Commands

Following are examples for each of the docker commands

Docker Version

$ docker version
root@arjun-VPCEH26EN:~# docker version
Client:
 Version:      17.05.0-ce
 API version:  1.29
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 22:10:54 2017
 OS/Arch:      linux/amd64

Server:
 Version:      17.05.0-ce
 API version:  1.29 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 22:10:54 2017
 OS/Arch:      linux/amd64
 Experimental: false

Docker Image Commands

List all Docker Images

$ docker images
root@arjun-VPCEH26EN:~# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
python              latest              26acbad26a2c        5 days ago          690MB
java                8                   d23bdf5b1b1b        8 months ago        643MB
hello-world         latest              c54a2cc56cbb        14 months ago       1.85kB

Create a Docker Image

$ docker build -t <application_name> .

The directory should contain Dockerfile, from which you are running the command in Terminal.

root@arjun-VPCEH26EN:/home/arjun/workspace/docker/java-application# docker build -t java-application .
Sending build context to Docker daemon  3.072kB
Step 1/5 : FROM java:8
 ---> d23bdf5b1b1b
Step 2/5 : COPY . /home/arjun/workspace/docker/java
 ---> 81af33906fe4
Removing intermediate container 7568d6b873a2
Step 3/5 : WORKDIR /home/arjun/workspace/docker/java
 ---> 8da95950d05c
Removing intermediate container 839d56d42bdf
Step 4/5 : RUN javac HelloWorld.java
 ---> Running in 9c9eb847d3e1
 ---> 7b122f467725
Removing intermediate container 9c9eb847d3e1
Step 5/5 : CMD java HelloWorld
 ---> Running in 8fccd7a65ce1
 ---> 0be5de5c6f51
Removing intermediate container 8fccd7a65ce1
Successfully built 0be5de5c6f51
Successfully tagged java-application:latest
root@arjun-VPCEH26EN:/home/arjun/workspace/docker/java-application#

Run a Docker image

$ docker run <docker_image_name>
root@arjun-VPCEH26EN:~# docker run java-application
HelloWorld from Java Application running in Docker.

Save Docker Image to .tar file

$ docker save -o <complete_tar_file_path> <docker_image_name>
root@arjun-VPCEH26EN:~# docker save -o /home/arjun/java-application.tar java-application
root@arjun-VPCEH26EN:~# cd /home/arjun/
root@arjun-VPCEH26EN:/home/arjun# ls java-appl*
java-application.tar

Remove a Docker image

$ docker rmi <docker_image_id>

When you list the docker images, you get the image id under IMAGE ID column.

root@arjun-VPCEH26EN:/home/arjun# docker rmi java-application
Untagged: java-application:latest
Deleted: sha256:0be5de5c6f51ffceb18078c42d6e11d94cf844ac1e06841c9bf993a9718cc325
Deleted: sha256:7b122f46772561d5ccd27c5d5a9524c9de4071f3a22234fb2eaa709d42e874b8
Deleted: sha256:2de3fc280f40633a189f24c154faa7c136ba8afbffb9238b8342f06b8bb5d461

Docker Container Commands

Show Running Containers

$ docker ps
root@arjun-VPCEH26EN:~# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Show All Containers

$ docker ps -a
root@arjun-VPCEH26EN:~# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
743.6.033ea0        java-application    "java HelloWorld"   2 minutes ago       Exited (0) 2 minutes ago                       awesome_hopper
3b76a109a28f        java-application    "java HelloWorld"   5 minutes ago       Exited (0) 5 minutes ago                       nostalgic_colden

Show Latest Created Container

$ docker ps -l
root@arjun-VPCEH26EN:~# docker ps -l
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
743.6.033ea0        java-application    "java HelloWorld"   4 minutes ago       Exited (0) 4 minutes ago                       awesome_hopper

Stop Container

$ docker stop <container_id>
root@arjun-VPCEH26EN:/home/arjun# docker stop 743.6.033ea0
743.6.033ea0

Remove Container

$ docker rm <container_id>
root@arjun-VPCEH26EN:/home/arjun# docker rm 743.6.033ea0
743.6.033ea0

Conclusion

In this Docker Tutorial – Docker Commands, we have learnt about all docker commands with examples.