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Apr 28, 2021
How to install Docker on Ubuntu 18.04? The steps below shows how to install docker on x8664 bit ubuntu desktop and have independent ubuntu shell inside docker. Note: docker works only with 64 bit ubuntu, hence if you have 32 bit ubuntu machine, it will not work. In this article, you’ll install and use Docker Community Edition (CE) on Ubuntu 18.04. Ubuntu 18.04 64-bit operating system. A user account with sudo privileges; Installing Docker.
Docker is an open-source technology that is used to deploy applications through containers. It is a relatively new platform but is constantly updated and features a wide community of users.
Docker is a great tool that solves the age-old dilemma between developers and system administrators – while developers say that an app works on their machines, system admins worry about changing its libraries and requirements. With Docker, that is no longer a problem as it allows a more transparent method of communication.
It is essentially a virtual machine, that lets you run images. With Docker, you don’t need to worry about the requirements and that’s a perfect fit for many VPS projects.
Docker is highly popular among developers and can be installed without any problems in our favorite Linux distribution.
So with this in mind, let’s learn how to install Docker on Ubuntu 18.04.
Why do Users Install Docker on Ubuntu
Let’s do a quick rundown of the main benefits users experience when using Docker.
Developer.ibm.com › Tutorials › Install-docker-onInstall Docker On Linux Running On IBM Power Systems Servers
Docker is adaptable allowing users to carry out continuous testing, deploy and check outcomes as many times as they want, with as many implications. It becomes a laboratory in itself where a user can experiment with new commands to fill in the container and make it functional in various tasks.
This utility also supports multi-cloud computing, which means it is adaptable to applications that use cloud computing for saving data on servers. Think of services like Microsoft Azure, Puppet, Ansible, OpenStack and others.
Segregation in an isolated environment is another core aspect of Docker that attracts developers. In addition, docker works with OS sensitive mount points like /sys and /proc which are read-only mounts.
How to Install Docker on Ubuntu 18.04
Docker is not in the official Ubuntu 18.04 repositories. However, the installation process will not be complicated because of it. Let’s begin.
1. Access Your VPS
First, we have to connect to the server using SSH. If you’re having trouble, check out our PuTTY tutorial.
2. Update Your System
Then, the system needs to be updated to make it safer and reliable to install Docker. Run the following two commands:
3. Install Prerequisite Packages
Once we have updated the system, we need to install some necessary packages before we are ready to install Docker. You can do this with the help of a single command:
To better understand the command above here is a short description of what it means:
- apt-transport-https – lets the package manager transfer files and data over https
- ca-certificates – lets the web browser and system check security certificates
- curl – transfers data
- software-properties-common – adds scripts to manage the software
4. Add the Docker Repositories
Now we have to add the Docker repositories. This will make the installation process much easier. This enables us to use the officially supported method of the installation.
First, we add the GPG key, by entering the following command in the command line:
Next, we add the repository:
After that, just update the repository information:
Make sure you are installing from the Docker repo instead of the default Ubuntu repo with this command:
A correct output will look like the following with different version numbers:
As you can see, docker-ce is not installed, so we can move on to the next step.
5. Install Docker on Ubuntu 18.04
We are almost done. Use the apt command to install Docker:
6. Check Docker Status
Once the installation is complete, it is a good idea to check the status of the service:
That’s it, you now know how to install Docker on Ubuntu 18.04. Easy, right? Let’s learn some Docker basics!
How to Start Using Docker on Ubuntu 18.04
Once Docker is installed, all we need to do is use the test image to check that everything is working as it should. Do this with the following command:
Now, if we want to search for available images we just have to use the following command:
Just replace your query with the bracketed text.
For example, if we want to search for an image related to Debian, the command and output will look like this:
Then, to download the image to our computer, we will use the name of the image along with the following command:
For example, the command might look like this:
Normally, users will have several images in their system. We can list them with the command:
The list will look much like the one you receive when you enter a search query.
After that, we can execute our image using the pull command and the Image ID.
There are options that extend the functionality of the command itself. For example, the -i option makes the image execution interactive. Or the -d option that executes it in the background.
Once we are running an image, we can end its execution by using the key combination CTRL+D.
How To Install The Sentrifugo HRM Solution On Ubuntu Server 18.04 ...
Finally, if we want to use Docker without root privileges, we need to run the following command:
After that, restart the system, and the changes will be applied.
Using the Docker Command
The Docker command consists of passing options, commands, and arguments. The syntax will follow the following form:
To view all of the available subcommands use the following command:
To view the options available with a command:
Here are Docker 18′ available subcommands:
Its main novelty is that it allows you to “package” an application or a set of services in containers. A Docker container is an instance of an application that contains all the libraries and components necessary for an application to work. From a practical point of view, a container is like a reduced virtual machine that functions independently from the operating system where a specific application or service is executed.
A Docker container is generated from an image that is the result of the packaged app or service. It can contain a complete operating system or pre-installed applications. That is to say, the container will start to work from an image.
There are many Docker images that we can use in our daily work cycle. We can also create our own images and further expand the possibilities of this great application.
Docker’s advantages make software deployment much more efficient and convenient than before. Thanks to this, developers will have no problems in knowing how your application will run outside the test environment. On the other hand, the system administrator will not have to struggle with system changes or looking for necessary libraries.
In this tutorial, we showed you the first steps to take with Docker. To unlock the true potential of this great utility, we recommend to check out the official documentation. Happy developing!
Edward is an expert communicator with years of experience in IT as a writer, marketer, and Linux enthusiast. IT is a core pillar of his life, personal and professional. Edward's goal is to encourage millions to achieve an impactful online presence. He also really loves dogs, guitars, and everything related to space.