Docker is widely spread and helps the user simplify the process of management of the container applications. It will allow you to package the software development and all the dependencies in a standard unit and its distribution. A single piece of software is wrapped up by a docker container in a file system that requires code, runtime, system tools and system libraries are required to run. You can quickly get a custom docker solution from 9series to take advantage of all these benefits.

Docker CE is helpful to secure your software through its various versions. If you are also looking to install Docker CE in Ubuntu, then you have landed at the right place! Here we have simplified the docker installation process for Ubuntu.

Scroll down to know the step-by-step procedure of installing the versions like 20.04, 18.04, 16.04 of Docker CE on Ubuntu with the help of a custom docker solution.

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Step 1: Update system

If you are planning to install these versions of Docker, then first check your system status because the older version may create some obstacles during installation. So, firstly, update your system by $ sudo apt update and then start installing.

Step 2: Install the basic dependencies for the installation

Docker CE needs some additional dependencies while installing on Ubuntu. So install some dependencies that are important to configure the repositories of Docker and perform the actual installation of the software packages are given below:-

• sudo apt install apt-transport-https ca-certificates curl software-properties-common
• GPG key by using curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add –
• Add the docker repository to the source of APT by using sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable”
• Now update the data base by suing packages of docker by new repo sudo apt update
• One can download them by discharging some commands in the extremity.

Step 3: Install Docker CE on Ubuntu 20.04, 18.04, 16.04

If you have any older versions, then uninstall them from your system before installing these new ones. After that, follow the following steps to continue:

• Import the Docker repository GPG key
• Now add the CE repository to the Ubuntu
• And finally, you can now install the Docker CE on Ubuntu 20.04, 18.04, 16.04
• Now add your user account to the group of Docker.
• For confirmation, verify the installation. You can do so by evaluating the Docker version.

Step 4: Install Docker Compose on Ubuntu 20.04, 18.04, 16.04

Installation of Docker compose is not mandatory, so you can avoid this step if you do not want to.
You can add your username in the docker group to avoid typing sudo again and again.
For the new members of the new group, first, you need to log out of the back of the server.
Enter the password to continue your membership.

Step 5: How to use Docker Command?

To use Docker, you have to go through a chain of options and commands of the system. Continue with the following steps:-

• Type $ Docker to check all the available subcommands.
• Now type “$ docker docker-subcommand –help” to review all the specific command options.
• To check the information of the Docker, type $ docker info.

Step 6: Functioning with the images of Docker

The containers in Docker can be built with the help of docker images. The docker images are pulled from the docker hub by default. Any hub of Docker can host the docker images, so you have to host images there for the distribution of applications. Follow the steps that are given below for the downloading of images from docker hub:-

• To check from where you can download the images by using docker hub, type $ docker run hello-world
• The following output will appear on the screen that will show that the Docker is efficiently working.
  Unable to find image ‘hello-world:latest’ locally
  latest: Pulling from library/hello-world
  0e03bdcc26d7: Pull complete
  Digest:sha256:6a65f928fb91fcfbc963f7aa6d57c8eeb426ad9a20c7ee045538ef34847f44f1
  Status: Downloaded newer image for hello-world:latest
• In the beginning, the Docker could not find the local image of hello-world, so the image is downloaded by the docker hub by default repository. After the image is downloaded, a container is created by the Docker by the downloaded image and the application within the container is executed, and the message is displayed on the screen.

Step 7: Functioning a docker container

The docker container can be very advantageous to the user and interactive due to its similarity with virtual machines and sound resources. Follow the following steps:-

• The interactive shell can be accessed by the collaboration of –I and –t in the container $ docker run -it Ubuntu.
• The command prompt should be changed so that it can tell that you are working in the container in the form of root@d9b100f2f636:/#
• Keep the container id in the command prompt because you may need this later to identify your id.
  After this, install the application from the official repository of Ubuntu.
• When you complete the installation, verify the Node.js, and the version number will appear on your screen.

Step 8: Management of Docker containers

After working with Docker, there will be many active and inactive Dockers in your system.

• See the active ones by $ docker ps.
• To view all the containers, start docker ps by –a switch by $ docker ps –a
• To see the latest container go through the -1 switch.
• To stabilize the container type, the docker starts with the container id.

Step 9: To make changes in a container to the docker image

Users can change the container to the new Docker by the command. –m switch is used to message, and –a is used to a specific author.

Step 10: Push the image of Docker to the docker repository

For this step, you need to have an account on this platform. The steps are as follows:

• First, log in to your account with the correct password.
• Now push your image by using $ docker push docker-registry-username/docker-image-name.
• After that, the image will appear on your dashboard.

Conclusion

To Install Docker, has the advantage of protecting a single piece of software in a complete file, and due to this, the user can get the data instantly by opening the file. Now one can learn how to install the Docker CE on Ubuntu 20.04, 18.04, 16.04 by using a custom docker consultation.