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Many businesses were looking for different ways to increase productivity in their teams. Many of them had tiresome processes, and it took a lot of time to develop and deploy an app. They later embraced Docker despite being a new technology and incorporated it into their development processes. Currently, many developers use Docker due to their containers that make cloud development easier. This article will cover a brief introduction to Docker, its benefits, and how to install it on Ubuntu operating system.
Docker is an open-source platform as a service(Paas) software that uses containers that enables companies to package their applications into virtualized operating systems. It allows them to run in any environment without installing the dependencies and operating systems. The containers make deploying applications to the cloud environments easier and faster.
Docker works as a tool kit, and it gives software developers and professionals the chance to perform many activities like run, update, build, deploy, and start containers using commands. It saves a lot of time it would take when using the normal environments. Software teams view it as a tool of automation, especially for teams that use the DevOps mechanism.
Most containers use virtual machines that are isolated and built on Linux Kernels. They have control groups(C groups)that help allocate resources amongst the application processes. It uses namespaces to ensure that a process does not affect the other resources of the software. It gives several application components the chance to share resources of a single part of the operating system in usage.
Become a Docker Certified professional by learning this Docker Training!
There are four methods of installing Docker on the Ubuntu operating system. These methods are:
Update the software packages and upgrade all the dependencies, this ensures that all the software is up to date. Open the terminal and type the following command:
sudo apt-get update
Install Docker by typing the following command on the terminal:
sudo apt install docker.io
After the installation, automate the Docker by activating the Docker service. Run the following commands:
sudo systemctl start docker
sudo systemctl enable docker
To confirm if Docker is successfully installed on your PC. Type the following command on the terminal and hit Enter:
docker --version
In this step, we use the Docker installation package located in the Ubuntu repository. Its version may be outdated. We first update all the local databases and packages.
sudo apt-get update
After updating everything, we need to download the dependencies, which involves getting them over the HTTPS.
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
The command consists of apt-transport-https, which enables the transfer of files and data,ca-certificates for confirming the security certificates, curl to transfer the data, and software-properties-common, which manages the software.
Now, let's add the GPG key, which helps ensure the software is secure and not from a fake source.
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
The next step is to install the Docker repository, which checks and returns the codename of the installation.
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Update all the existing repositories by typing the following command on the terminal:
sudo apt-get update
Get the latest version of the Docker packages
sudo apt-get update
Install all the latest Docker packages
sudo apt-get install docker-ce
You can specify the type of Docker packages you want by typing the following command:
apt-cache madison docker-ce
You can choose the correct version by specifying as follows
sudo apt-get install docker-ce=[version]
where you replace the version with the version you want.
To get a .deb package.Head over to the Docker official website, click on Pool, next click on Stable, and finally, the amd64 option.
Choose the package you want to install from the list and download it.
Type the following command on the terminal to install the Docker file. Remember to use the path of the downloaded file correctly.
sudo dpkg -i /path/to/docker.package.deb
Don’t ever use this method during deployment or production. It's only meant for testing purposes. The first step is to have the Docker engine installed.
To install the Docker engines, use the script from https://get.docker.com/ to install it by running the following command on the terminal:
curl -fsSL https://get.docker.com -o get-docker.sh
To install Docker, run the following command that automatically starts the Docker.
sh get-docker.sh
This technology has a lot of advantages for the users due to the use of containers. Some of the benefits of using Docker when building applications include:
Top 30 Frequently Asked Docker Interview Questions !
Most companies used physical servers and other technologies that brought a lot of issues to the teams. It was a bit hard, especially right now when there are a lot of cybersecurity issues.
When you incorporate Docker into your development team, it gives you a lot of flexibility and assurance that everything is well from development and deployment to production. Learning and using Docker is faster and more accessible, and it won't take much time to master its usage.
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