How To Install Docker on Ubuntu 18.04 & 16.04 LTS

    RahulBy 3 Mins ReadUpdated:

    Docker is container-based application framework, which wraps a specific application with all its dependencies in a container. Docker containers can easily to ship to the remote location on start there without making entire application setup. This tutorial will help you to install Docker on Ubuntu 19.10, 18.04 LTS, and 16.04 LTS systems.

    1. Prerequisite

    The very first step is to remove any default Docker packages from the system before installation Docker on a Linux VPS. Execute commands to remove unnecessary Docker versions.

    sudo apt-get purge docker lxc-docker docker-engine docker.io

    Now install some required packages on your system for installing Docker on Ubuntu system. Run the below commands to do this:

    sudo apt-get install curl apt-transport-https ca-certificates software-properties-common

    2. Setup Docker Repository

    Now import dockers official GPG key to verify packages signature before installing them with apt-get. Run the below command on terminal.

    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add

    After that add the Docker repository on your Ubuntu system which contains Docker packages including its dependencies. You must have to enable this repository to install Docker on Ubuntu.

    sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

    3. Install Docker on Ubuntu

    Your system is now ready for Docker installation. Run the following commands to upgrade apt index and then install Docker community edition on Ubuntu.

    sudo apt-get update
sudo apt-get install docker-ce

    After successful installation of Docker community edition, the service will start automatically, Use below command to verify service status.

    sudo systemctl status docker

    Your system is now ready for running Docker containers. Use our Docker Tutorial for Beginners to working with Docker.

    4. How to Use Docker

    After installation of Docker on a Linux. Here are some basic details for search and download Docker images, launch containers and manage them.

    Search Docker Images

    First of all search Docker container images from Docker hub. For example, below command will search all images with Ubuntu and list as output.

    docker search ubuntu

    Download Docker Images

    Now download the Docker container with name Ubuntu on your local system using following commands.

    docker pull ubuntu

latest: Pulling from library/ubuntu

fa5be2806d4c: Pull complete
b4af4261cb15: Downloading [==>               ] 3.779 MB/70.55 MB
5d358abc5d9c: Download complete
2933d50b9f77: Download complete

    Now make sure that above images have been downloaded successfully on your system. Below command list all images.

    docker images

REPOSITORY  TAG            IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu      latest         36248ae4a9ac        7 days ago          188 MB

    Launch New Container with Image

    Finally, launch a Docker container using an above-downloaded image on your system. Below command will start a new container and provide you access to that container with /bin/bash shell.

    docker run -i -t ubuntu /bin/bash

    To exit from docker container type CTRL + P + Q. This will leave container running in the background an provide you host system console. If you used exit command, it will stop the current container.

    After exiting from Docker container, execute below command to list all running containers.

    docker ps

CONTAINER ID     IMAGE     COMMAND        CREATED        STATUS        PORTS    NAMES
f2582758af13     ubuntu    "/bin/bash"    2 hours ago    Up 2 hours             first_ubuntu

    By default Above command will list only running containers. To list all containers (including stopped container) use following command.

    docker ps -a

    Start/Stop/Attach Container

    You can start, stop or attach to any containers with following commands. To start container use following command.

    docker start <CONTAINER_ID>

    To stop container use following command.

    docker stop <CONTAINER_ID>

    To attach to currently running container use following command.

    docker attach <CONTAINER_ID>
    Share.

    Related Posts

    3 Comments

    2. pradeep varakala on

      sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable”

      while executing above command i am getting error like the following:

      Traceback (most recent call last):
      File “/usr/bin/add-apt-repository”, line 11, in
      from softwareproperties.SoftwareProperties import SoftwareProperties, shortcut_handler
      File “/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py”, line 27, in
      import apt_pkg
      ModuleNotFoundError: No module named ‘apt_pkg’

      can you please give me solution to me query

      Reply

    Leave A Reply