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Anyone can execute that task just by running the container - they don’t need the actual scripts or configuration information. You could build a Docker image that executes a script to configure something. In the example above it’s 888e89a3b36b.Ĭontainers which do one task and then exit can be very useful. Note: The container ID is the hostname that the container displayed. When this happens, Docker automatically pulls it from Docker Hub.Īfter the image is pulled, the container’s hostname is displayed ( 888e89a3b36b in the example below).ĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĨ88e89a3b36b alpine "hostname" 50 seconds ago Exited (0) 49 seconds ago awesome_elion The output below shows that the alpine:latest image could not be found locally. Run the following command in your Linux console. The container will start, execute the hostname command, then exit. In this step we’re going to start a new container and tell it to run the hostname command. Run a single task in an Alpine Linux container In this section you’ll try each of those options and see how Docker manages the workload. In the background: For long-running services like websites and databases.Interactively: This connects you to the container similar to the way you SSH into a remote server.To run a single task: This could be a shell script or a custom app.There are different ways to use containers. Task 1: Run some simple Docker containers
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If you do not have a DockerID (a free login used to access Docker Hub), please visit Docker Hub and register for one. This will make a copy of the lab’s repo in a new sub-directory called linux_tweet_app. Use the following command to clone the lab’s repo from GitHub (you can click the command or manually type it). You will need all of the following to complete this lab:
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Finally, we’ll look at how to use bind mounts to modify a running container as you might if you were actively developing using Docker.ĭifficulty: Beginner (assumes no familiarity with Docker) We’ll start by running some simple containers, then we’ll use a Dockerfile to build a custom app.
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In this lab, we will look at some basic Docker commands and a simple build-ship-run workflow.