Docker

Docker in Practice: Images, Containers, and Orchestration Docker helps you package an application and its dependencies as an image. An image is a portable blueprint that can be shared. A container is a running instance of that image, with its own writable layer, network, and process space. This makes applications more predictable across different machines. Images are built in layers. Each command in a Dockerfile adds a layer. Layers help with caching: if you change one part, Docker rebuilds only what is needed. This keeps builds fast and repeatable. Small, focused images also start quicker and use less disk space. ...