Install Ubuntu 1911/9/2021
A few moments later, after the desktop has loaded, you’ll see the welcome window.sudo apt-get install libpng12-0.
![]() Ubuntu 19 How To Use TheWe’ll explore how to use the docker command later in this tutorial. sudo add-apt-repository "deb focal stable"This will also update our package database with the Docker packages from the newly added repo.Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:You’ll see output like this, although the version number for Docker may be different:Output● docker.service - Docker Application Container EngineLoaded: loaded (/lib/systemd/system/docker.service enabled vendor preset: enabled)Active: active (running) since Tue 17:00:41 UTC 17s ago└─24321 /usr/bin/dockerd -H fd:// -containerd=/run/containerd/containerd.sockInstalling Docker now gives you not just the Docker service (daemon) but also the docker command line utility, or the Docker client. sudo apt install apt-transport-https ca-certificates curl software-properties-commonThen add the GPG key for the official Docker repository to your system:Add the Docker repository to APT sources: To do that, we’ll add a new package source, add the GPG key from Docker to ensure the downloads are valid, and then install the package.First, update your existing list of packages:Next, install a few prerequisite packages which let apt use packages over HTTPS: To ensure we get the latest version, we’ll install Docker from the official Docker repository. Ubuntu 19 Archive Or STDINPauseBy default, Docker pulls these images from Docker Hub, a Docker registry managed by Docker, the company behind the Docker project. Step 4 — Working with Docker ImagesDocker containers are built from Docker images. We’ll start by working with images. If you attempt to run the docker command without prefixing it with sudo or without being in the docker group, you’ll get an output like this:Output attach Attach local standard input, output, and error streams to a running containerCommit Create a new image from a container's changesCp Copy files/folders between a container and the local filesystemDiff Inspect changes to files or directories on a container's filesystemEvents Get real time events from the serverExec Run a command in a running containerExport Export a container's filesystem as a tar archiveImport Import the contents from a tarball to create a filesystem imageInspect Return low-level information on Docker objectsLoad Load an image from a tar archive or STDINPause Pause all processes within one or more containersPort List port mappings or a specific mapping for the containerPull Pull an image or a repository from a registryPush Push an image or a repository to a registrySave Save one or more images to a tar archive (streamed to STDOUT by default)Start Start one or more stopped containersStats Display a live stream of container(s) resource usage statisticsTag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGETop Display the running processes of a containerUnpause Unpause all processes within one or more containersUpdate Update configuration of one or more containersVersion Show the Docker version informationWait Block until one or more containers stop, then print their exit codesTo view the options available to a specific command, type:To view system-wide information about Docker, use:Let’s explore some of these commands. After all, they are similar to virtual machines, only more resource-friendly.As an example, let’s run a container using the latest image of Ubuntu. Containers can be much more useful than that, and they can be interactive. Step 5 — Running a Docker ContainerThe hello-world container you ran in the previous step is an example of a container that runs and exits after emitting a test message. 1c08a7a0d0e4 ubuntu "/bin/bash" 2 minutes ago Exited (0) 40 seconds ago quizzical_mcnultyTo start a stopped container, use docker start, followed by the container ID or the container’s name. CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES Both containers are no longer running, but they still exist on your system.To view all containers — active and inactive, run docker ps with the -a switch:You’ll see output similar to this: 1c08a7a0d0e4 ubuntu "/bin/bash" 2 minutes ago Exited (0) 8 seconds ago quizzical_mcnultyA707221a5f6c hello-world "/hello" 6 minutes ago Exited (0) 6 minutes ago youthful_curieTo view the latest container you created, pass it the -l switch: Let’s look at how that works. See the docker run help command for more information on these options and others.Containers can be turned into images which you can use to build new containers. You can also use the -rm switch to create a container that removes itself when it’s stopped. Use the docker ps -a command to find the container ID or name for the container associated with the hello-world image and remove it.You can start a new container and give it a name using the -name switch. This time, we’ll use the name that Docker assigned the container, which is quizzical_mcnulty:Once you’ve decided you no longer need a container anymore, remove it with the docker rm command, again using either the container ID or the name. But you might want to reuse this Node.js container as the basis for new images later.Then commit the changes to a new Docker image instance using the following command. You can start and stop it, but once you destroy it with the docker rm command, the changes will be lost for good.This section shows you how to save the state of a container as a new Docker image.After installing Node.js inside the Ubuntu container, you now have a container running off an image, but the container is different from the image you used to create it. The changes that you make will only apply to that container.
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