Introduction to Docker

This means the Docker container will have much less to load and therefore will use fewer resources. This way you can spin up more containers per VM and use your hardware more efficiently. So, if you already have the Ubuntu image downloaded on your computer, and you’re building a new image which relies on one or more layers of that image, Docker won’t build them again.

Docker enables portability for when these packaged containers are moved to different servers or environments. In 2013, Docker introduced what would become the industry standard for containers. Containers are a standardized unit of software that allows developers to isolate their app from its environment, solving the “it works on my machine” headache.

A Brief History of Docker

Both offer the same core features and functionality but work on different OSs. If you’re not creating software at a great scale, we recommend opting for the CE. In this section, we’ll go over three common Docker use cases and explain how you can benefit from it. The Docker architecture consists of four main components along with Docker containers which we’ve covered earlier. While these systems cannot be compared, you can use both for the best results. Have Jenkins schedule different tasks and Docker isolate jobs from one another with the help of containers.

Each time a container is created from a Docker image, yet another new layer called the container layer is created. Changes made to the container—such as the addition or deletion of files—are saved to the container layer only and exist only while the container is running. Docker is an open-source containerization platform used for developing, deploying, and managing applications in lightweight virtualized environments called containers. You might create your own images or you might only use those created by others
and published in a registry.

The underlying technology

We created an application using Docker and pushed our image to Docker Hub. Lastly, we learned how we could remove a particular image from our local system and later pull the image from Docker Hub if it doesn’t exist locally. Now we think about docker because it’s purpose is to
containerise the applications and automate the deployment of applications and ship them very easily. Since we cannot have different versions of Python installed on the same machine, this prevents us from hosting all three applications on the same computer. In other words, you don’t need to have whole different OS (called guest OS) installed inside your host OS. You can have several containers running within a single OS without having several different guest OS’s installed.

  • Additionally, they can share data between containers using data volumes.
  • Have Jenkins schedule different tasks and Docker isolate jobs from one another with the help of containers.
  • All of these scenarios play well into Docker’s strengths where it’s value comes from setting containers with specific settings, environments and even versions of resources.
  • For example, Docker allows running the WordPress content management system on Windows, Linux, and macOS systems without any issues.
  • It supplies over 100,000 images available for use created by open-source projects, software vendors, and the Docker community.

Store data where it makes the most sense for applications and services with IBM hybrid cloud storage solutions across on-premises, private and public cloud. Docker images are made up of layers, and each layer corresponds to a version of the image. Whenever a developer makes changes to the image, a new top layer is created, and this top layer replaces the previous top layer as the current version of the image.

Docker’s technology is unique because it focuses on the requirements of developers and systems operators to separate application dependencies from infrastructure. In case of hardware failure, users can quickly revert any changes if they have a Docker image ready. They only need to import What Is Docker the image backup to a new machine, and Docker will do the rest. Docker image backups are also beneficial when developers want to roll back to a previous version of specific software due to bugs or incompatibility. With Docker, you can try out new software without installing it manually.

What Is Docker

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