You likely have a lot of stuff installed on that server, you’ve got an nginx web server for hosting static content, you’ve probably got a database for storing some stuff on the backend, maybe you have an API server running on Express.js as well. Let’s say you have a web server that you’re using for your application. Docker makes running multiple servers very easy, especially with orchestration engines like Kubernetes and Docker Swarm.ĭocker also allows you to organize your code for deploying on new services. Once you build a container, you can share the container file with anyone, and they could easily have your app up and running with a few commands.
If you wanted to add another server to your cluster, you wouldn’t have to worry about reconfiguring that server and reinstalling all the dependencies you need. With Docker, your development environment will be exactly the same as your production environment, and exactly the same as everyone else’s development environment, alleviating the problem of “it’s broken on my machine!” And since everything is contained, it makes managing all of your dependencies much easier. Since your container is a single image, it makes it very easy to version track different builds of your container.
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RELATED: How to Install Docker and Docker Compose on Linux Why Is Docker So Useful?ĭocker takes the same kind of version control and packaging that tools like Git and NPM provide and allows you to use it for your server software. If your app makes use of nginx and Node.js, the container image will include them, but you won’t be burdened with all the other userland apps you’d generally find on Linux. The Docker container image includes only what your app needs to run. You couldn’t though, for example, run FreeBSD on Ubuntu, since the kernels are different.
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Docker can install this user software to the container, allowing you to run a CentOS container on Ubuntu. The exact flavor of Linux doesn’t actually matter most versions of Linux will run the same kernel, and only differ in the user software. Instead of running an entire separate operating system (which is a massive overhead), Docker runs containers, which use the same host operating system, and only virtualize at a software level.ĭocker Engine runs on Linux, Windows, and macOS, and supports Linux and Windows for Docker containers.
Docker is similar in concept to Virtual Machines, except it’s much more lightweight.
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