It is the most worthy alternative to Docker as it has the most real-world adoption, has a fairly big open source community, and is part of the CNCF. All follow a similar concept of images and containers, but have some technical difference worth understanding: rkt (pronounced ‘rocket’) from the Linux distributor, CoreOSĬoreOS released rkt in 2014, with a production-ready release in February 2016, as a more secure alternative to Docker. While Docker is the most widely used and recognized container technology, there are other technologies that either preceded Docker, emerged side-by-side with Docker, or have been introduced more recently.
Docker Registries: Registries are locations from where we store and download (or “pull”) images.At a lower level, you have containerd, which is a core container runtime that initiates and supervises container performance. A container is defined by the image and configuration options. Containers: Containers are encapsulated environments in which applications are run.Images are used to store and ship applications. Images: The read-only template used to build containers.Apart from networks, volumes, services, and other objects the two main requisite objects are: Docker Objects: Objects are used to assemble an application.
The Docker client can reside on the same host as the daemon or a remote host.
This image can then be used to spawn an instance of your application – a container.
This is where Docker comes in! Docker is a technology that allows you to incorporate and store your code and its dependencies into a neat little package – an image. What if there is something that is light in terms of storage, abstracted enough to be run anywhere, and independent of the language used for development? This approach, while versatile, comes at the cost of large image sizes, high IO overhead, and maintenance costs. On the other end of the ‘run anywhere’ spectrum, we have Virtual Machines. This is a great paradigm except that, if you have a java application, for example, in order to run it anywhere you need platform-specific implementations of the Java Virtual Machine. You probably heard of the statement ‘Write once, run anywhere’, a catchphrase that SUN Microsystems came out with to capture Java’s ubiquitous nature. In this page, you’ll learn everything you need to know about Docker alternatives