Optimizing resources in the best possible way allows the computer to perform better. One way to do it is by using which allow testing and generating content without the need to occupy the entire operating system.
Taking a step forward the developer community has searched for a way run applications virtually by using containerswhich load only the core of the application that ends up creating small spaces in the operating system and consuming very few resources.
One of the virtual projects that has become known in recent years is Docker. Maybe you’ve heard him name somewhere, but you don’t know much about him. That is our mission in today’s course, to teach you in detail how these containers work, how they work, how to install them and how to create them.
What is Docker and what are these “containers” for in Linux?
Docker is a platform used by software developers for the purpose of packaging applications in containers, making them less heavy, having the security that once they are going to run on any computer they will do so without any inconvenience. in that package There are the necessary elements for the tool to work on all operating systems.
The application stored in the container can run portable even if the operating system does not have some features that are included in the package. And another of the advantages it has is that the consumption of computer resources is very low, which guarantees its stability. Also, containers are used to save space on the PC and avoid contagion in the event that a virus or malware is dragged.
How do Linux LXC containers work and how are they different from a virtual machine?
To save resource usage, containers load only the elements necessary for the application to run in the operating system kernel. To cite one case, they could only require 20 percent of RAM memory and leave the rest free for any other work. Likewise, the weight of containerized applications is measured in megabytes, which allows its transfer in a simple way while in virtual machines we talk about gigabytes.
Requiring to install an additional operating system so they use more resources. Another difference is the creation period, the containers are ready in minutes while the virtual machine takes more time to run and configure. on the subject of security, virtual machines are more secure by having their own operating system installedthe containers share the preloaded core.
What kind of files and documents can be stored in a Docker container?
Containers are saved as uploaded images with a configuration previous, in which contain the libraries, repositories, and dependencies needed to run the application. The success has been so great that large computer companies have implemented it to streamline their operations. In the end, the images that are created are in the form of layers that contain all the files entered in the container that are of three types: volumes, bind mounts and tmpfs.
Learn step by step how to install Docker on your computer with the Linux operating system
In most distros the process is the same, although there are different ways to do it. using the binaries, the source code or through commandswhich is the option we have chosen for this course.
First of all, we install the system updates, entering the following line:
- sudo apt update and then sudo apt upgrade
We add some packages necessary for the operation with these commands:
sudo apt-get install \ apt-transport-https \ ca-certificates \ curl \ software-properties-common
To get the domain and the client, we execute the following command:
- sudo curl -fsSL https://get.docker.com/ | sh
Then we start the domain that is the one that will allow us to activate the service, in this case, we are going to use the following codes:
- sudo systemctl enable docker
- sudo systemctl start docker
To check that the installation has gone well, we do it with the following command:
- sudo systemctl status docker
Yes does not throw any errorit means that we can use it with confidence.
We show you the steps you must follow to create your first container in Linux without errors
For a container to work without errors, it needs to include dependencies, libraries and certain tools that are part of the operating system. There are a lot of commands you’re going to need to work, but just running Docker in the terminal you will know them all.
To create the container we use this command:
- docker run -i -t ubuntu /bin/echo Test container
- The command will use a computer image and if it does not find it, it will proceed to download it.
- After creating it, it assigns its space and an interface that will make it possible guest/host communication.
- When you carry out the process, the phrase will appear “Proof” container that we place when creating it.
Now, there are other commands that you can use to see the development and execution of the container that you just created, some examples are the following:
- All the images you have availableyou get them with this command: docker images
- If you want to boot one of the containers that you created, use this code: docker start -a
- Stopping the container is very simpleyou just need to enter this: docker stop
Although containers have been around for a long time, Docker popularized their use in 2013, allowing developers to simplify the delivery of their packages. Secondly, For new programmers, Docker offers a nice and clean environment, In addition, being open source allows you to choose the functionalities that you will use in your projects. And although there are other alternatives, the support offered by the community and its constant growth make it the best option.
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