Why? Because the environment on both sides are not the same.įor example, lets say your machine runs python 3.5 but the CentOS server runs python 2.7, so your code fails because of difference in version.Īnd therefore, you can use Docker to help you simulate the server environment perfectly without changing anything on your local machine. Imagine a situation when you program the software on the local machine very well, but when it was uploaded to the server, it didn’t work. Simulate the server environment at the local machine In other words, Docker is the platform that lets you create, manage, modify, deploy and work with containers. Simply understand, Docker is a platform (both commercial and free) that provides services and tools, allowing you to create packages and run your programs on different environments as quickly as possible. Now, you understood that the container will help you to have a software development environment quickly and not conflict with the rest of the server.īut, how to get containers or perhaps how to create containers? How can we work with containers and manage containers? And later, you just need to run the file and you have the environment ready as you want. You can pack all those things into one file. Therefore, to answer this problem container came into existence. Imagine that, every time you start writing a software, you need to install dependent packages to work, from OS, web server, php version, mariadb, and so on. The software companies race on technology, software development lifecycle needs to be done continuously and quickly. With the above definition, you’re still wondering what the container does? What is a container?Īccording to information from the docker home page, the container defines the following:Ī container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. So, coming to very first question that would pops up in any mind, what is docker? What does it do and why should we use it?īefore we find out what it is, let’s see this one first. Or, just in case you haven’t heard about docker, let’s understand it from very beginning. If you are reading this article it means you might have heard a lot about docker.

Install docker compose centos 7