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 17.10, 16.04 LTS & 14.04 LTS.
Step 1 – Prerequsites
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
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
To install Docker on Linux system required the 64-bit operating system with Kernel >= 3.10 version. Older versions of Kernel have some missing requirements to run all features of Docker.
uname -r 4.4.0-21-generic
The Ubuntu 14.04 LTS users recommended to install the linux-image-extra kernel package before procedding the docker install on Ubuntu 14.04.
sudo apt-get install linux-image-extra-$(uname -r)
Step 2 – Configure Docker Apt Repository
First 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
Now add the Docker repository on your Ubuntu system which contains Docker packages including its dependencies. You must have to enable this repository to install latest Docker on Ubuntu Linux.
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Step 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.
Step 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
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>
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