Images define the software available in containers. Docker uses the Dockerfile to construct an image. You define a container’s creation steps as instructions in a Dockerfile. You can spin up a new service with a single docker run command.Ĭontainers encapsulate everything needed to run an application, from OS package dependencies to your own source code. It’s a neat way to quickly launch applications without impacting the rest of your system. Docker Basicsĭocker has become a standard tool for software developers and system administrators. They share your host’s kernel and virtualize at a software level. Unlike VMs, Docker containers don’t run a full operating system. Each container provides an isolated environment similar to a virtual machine (VM). Docker creates packaged applications called containers.
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