When we open another window and list containers, we see a different picture: The -it flags allow us to interact with the shell. With a single Docker command, docker run -it ubuntu bash, we downloaded an Ubuntu Linux image and started a login shell as root inside it. Hello-world’s instructions gave us an interesting example: Let’s run a container that doesn’t exit immediately. If we check docker ps again, we still see two containers. We’ll take a look at that below when we work with applications designed to keep running in the background. We stop containers with docker stop and remove them with docker rm. The –attach tells Docker to connect to the container output so we can see the results. We use the start command, and rather than naming the image, we specify the name of a container that’s already loaded. This time, we used docker start –attach instead of docker run. Let’s try starting one of the stopped containers: If we want to reuse a container, we refer to it by name. When we told Docker to run an image named hello-world, it did exactly that it ran a new instance of the image. We see two stopped instances of hello-world, with two different names. …except this time we don’t see information about downloading the image. Let’s run this image again with docker run hello-world. The names column has a name, kind_bose, that Docker assigned to the container for us. The status column tells us that it’s exited. Let’s take a look at a few more Docker commands that tell us more about the environment.ĭocker ps -a lists the containers on our system:įrom this, we can see that the hello-world container is still in memory. Then it spells out the process for us before recommending some additional steps. Hello-world displays a message telling us everything’s working. When it can’t find the image, Docker downloads it from Docker Hub for us. It runs an image named “hello-world.”ĭocker looks for this image on our local system.
From scratch install#
Once we install the tools, we can run a Docker image:ĭocker run hello-world does exactly what it sounds like. NET, Java, PHP, Node.js, Ruby, and Python.
From scratch code#
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From scratch download#
Download the correct installer for your operating system and run the installation. We’ll start by installing the Docker desktop tools found here. We’ll look at these basic concepts as we install the Docker tools, and create images and containers.
From scratch windows 10#
Implementations on non-Linux platforms such as macOS and Windows 10 use a single Linux virtual machine. However, a Linux runtime is required for Docker. Compared to virtual machines, containers use less memory and less CPU. It’s important to note that Docker containers don’t run in their own virtual machines, but share a Linux kernel. Images run in containers, which are discrete processes that take up only as many resources as any other executable. It packages applications as images that contain everything needed to run them: code, runtime environment, libraries, and configuration. Docker applications run in containers that can be used on any system: a developer’s laptop, systems on premises, or in the cloud.Ĭontainerization is a technology that’s been around for a long time, but it’s seen new life with Docker. Docker is a platform for packaging, deploying, and running applications.
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