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Aug 10, 2019 Docker looks for centos image locally, and it is not found, it starts downloading the centos image from Docker registry. Once the image has been downloaded, it will start the container and echo the command Hello-World in the console which you can see at the end of the output. $ sudo service docker start Redirecting to /bin/systemctl start docker.service Failed to start docker. Docker Install On Centos 7.7 Sep 30, 2020 CentOS is a Linux operating system, which is a 100% compatible rebuild of the Red Hat Enterprise Linux. A user can download and use this enterprise-level operating system free of cost.

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You can use any Linux distribution inside of the Windows Subsystem for Linux (WSL), even if it is not available in the Microsoft Store, by importing it with a tar file.

This article shows how to import the Linux distribution, CentOS, for use with WSL by obtaining its tar file using a Docker container. This process can be applied to import any Linux distribution.

Obtain a tar file for the distribution

First you'll need to obtain a tar file that contains all the Linux binaries for the distribution.

You can obtain a tar file in a variety of ways, two of which include:

  • Download a provided tar file. You can find an example for Alpine in the 'Mini Root Filesystem' section of the Alpine Linux downloads site.
  • Find a Linux distribution container and export an instance as a tar file. The example below will show this process using the CentOS container.

Obtaining a tar file for CentOS example

In this example, we'll use Docker inside of a WSL distribution to obtain the tar file for CentOS.

Prerequisites

  • You must have WSL enabled with a Linux distribution installed running WSL 2.
  • You must have Docker Desktop for Windows installed with the WSL 2 engine enabled and integration checked for the distribution you will use in the next steps.

Export the tar from a container

  1. Open the command line (Bash) for a Linux distribution that you've already installed from the Microsoft Store (Ubuntu in this example).

  2. Start the Docker service:

  3. Run the CentOS container inside Docker:

  4. Grab the CentOS container ID using grep and awk:

  5. Export the container ID to a tar file on your mounted c-drive:

This process exports the CentOS tar file from the Docker container so that we can now import it for use locally with WSL.

Import the tar file into WSL

Once you have a tar file ready, you can import it using the command: wsl --import <Distro> <InstallLocation> <FileName>.

Importing CentOS example

To import the CentOS distribution tar file into WSL:

  1. Open PowerShell and ensure that you have a folder created where you'd like the distribution to be stored.

  2. Use the command wsl --import <DistroName> <InstallLocation> <InstallTarFile> to import the tar file.

  3. Use the command wsl -l -v to check which distributions you have installed.

  4. Finally, use the command wsl -d CentOS to run your newly imported CentOS Linux distribution.

Add WSL specific components like a default user

By default when using --import, you are always started as the root user. You can set up your own user account, but note that the set up process will vary slightly based on each different Linux distribution.

To set up user account with the CentOS distribution we just imported, first open PowerShell and boot into CentOS, using the command:

Next, open your CentOS command line. Use this command to install sudo and password setting tools into CentOS, create a user account, and set it as the default user. In this example, the username will be 'caloewen'.

You must now quit out of that instance and ensure that all WSL instances are terminated. Start your distribution again to see your new default user by running this command in PowerShell:

Centos docker daemon.json

You will now see [[email protected]]$ as the output based on this example.

To learn more about configuring WSL settings, see Configure settings with .wslconfig and wsl.conf.

Use a custom Linux distribution

You can create your own customized Linux distribution, packaged as a UWP app, that will behave exactly like the WSL distributions available in the Microsoft Store. To learn how, see Creating a Custom Linux Distribution for WSL.

Sep 30, 2020 CentOS is a Linux operating system, which is a 100% compatible rebuild of the Red Hat Enterprise Linux. A user can download and use this enterprise-level operating system free of cost. The CentOS project has announced a new update to the distribution, releasing CentOS 7.8 which is derived from Red Hat Enterprise Linux 7.8. The official build of CentOS. Oct 04, 2019 This article aims at “30 Things to Do After Installing RHEL/CentOS 7”. The post is written keeping in mind you have installed RHEL/CentOS Minimal Install which is preferred in Enterprise and production environment, if not you can follow below guide that will show you minimal installations of both. Installation of CentOS 7 Minimal. I tried this method, but the instructions for Centos are only accurate for version 6.5 and below. Unfortunately I am running 7.0. I tried to revert everything by moving the /var/lib/docker directory back to its original location, but now when I run docker images or docker ps -a, I have no containers or images.

Estimated reading time: 7 minutes

You can run Compose on macOS, Windows, and 64-bit Linux.

Prerequisites

Docker Compose relies on Docker Engine for any meaningful work, so make sure youhave Docker Engine installed either locally or remote, depending on your setup.

  • On desktop systems like Docker Desktop for Mac and Windows, Docker Compose isincluded as part of those desktop installs.

  • On Linux systems, first install theDocker Enginefor your OS as described on the Get Docker page, then come back here forinstructions on installing Compose onLinux systems.

  • To run Compose as a non-root user, see Manage Docker as a non-root user.

Install Compose

Follow the instructions below to install Compose on Mac, Windows, Windows Server2016, or Linux systems, or find out about alternatives like using the pipPython package manager or installing Compose as a container.

Install a different version

The instructions below outline installation of the current stable release(v1.28.6) of Compose. To install a different version ofCompose, replace the given release number with the one that you want. Composereleases are also listed and available for direct download on theCompose repository release page on GitHub.To install a pre-release of Compose, refer to the install pre-release buildssection.

Install Compose on macOS

Docker Desktop for Mac includes Compose alongwith other Docker apps, so Mac users do not need to install Compose separately.For installation instructions, see Install Docker Desktop on Mac.

Install Compose on Windows desktop systems

Docker Desktop for Windows includes Composealong with other Docker apps, so most Windows users do not need toinstall Compose separately. For install instructions, see Install Docker Desktop on Windows.

If you are running the Docker daemon and client directly on MicrosoftWindows Server, follow the instructions in the Windows Server tab.

Install Compose on Windows Server

Follow these instructions if you are running the Docker daemon and client directlyon Microsoft Windows Server and want to install Docker Compose.

  1. Start an “elevated” PowerShell (run it as administrator).Search for PowerShell, right-click, and chooseRun as administrator. When asked if you want to allow this appto make changes to your device, click Yes.

  2. In PowerShell, since GitHub now requires TLS1.2, run the following:

    Then run the following command to download the current stable release ofCompose (v1.28.6):

Note: On Windows Server 2019, you can add the Compose executable to $Env:ProgramFilesDocker. Because this directory is registered in the system PATH, you can run the docker-compose --version command on the subsequent step with no additional configuration.

  1. Test the installation.

Install Compose on Linux systems

On Linux, you can download the Docker Compose binary from theCompose repository release page on GitHub.Follow the instructions from the link, which involve running the curl commandin your terminal to download the binaries. These step-by-step instructions arealso included below.

For alpine, the following dependency packages are needed:py-pip, python3-dev, libffi-dev, openssl-dev, gcc, libc-dev, rust, cargo and make.

  1. Run this command to download the current stable release of Docker Compose:

    To install a different version of Compose, substitute 1.28.6with the version of Compose you want to use.

    If you have problems installing with curl, seeAlternative Install Options tab above.

  2. Apply executable permissions to the binary:

Note: If the command docker-compose fails after installation, check your path.You can also create a symbolic link to /usr/bin or any other directory in your path.

For example:

  1. Optionally, install command completion for thebash and zsh shell.

  2. Test the installation.

Alternative install options

Install using pip

For alpine, the following dependency packages are needed:py-pip, python3-dev, libffi-dev, openssl-dev, gcc, libc-dev, rust, cargo, and make.

Compose can be installed frompypi using pip. If you installusing pip, we recommend that you use avirtualenv because many operatingsystems have python system packages that conflict with docker-composedependencies. See the virtualenvtutorial to getstarted.

If you are not using virtualenv,

pip version 6.0 or greater is required.

Install as a container

Centos

Compose can also be run inside a container, from a small bash script wrapper. Toinstall compose as a container run this command:

DockerCentos

Install pre-release builds

If you’re interested in trying out a pre-release build, you can download releasecandidates from the Compose repository release page on GitHub.Follow the instructions from the link, which involves running the curl commandin your terminal to download the binaries.

Pre-releases built from the “master” branch are also available for download athttps://dl.bintray.com/docker-compose/master/.

Pre-release builds allow you to try out new features before they are released,but may be less stable.

Upgrading

If you’re upgrading from Compose 1.2 or earlier, remove ormigrate your existing containers after upgrading Compose. This is because, as ofversion 1.3, Compose uses Docker labels to keep track of containers, and yourcontainers need to be recreated to add the labels.

If Compose detects containers that were created without labels, it refusesto run, so that you don’t end up with two sets of them. If you want to keep usingyour existing containers (for example, because they have data volumes you wantto preserve), you can use Compose 1.5.x to migrate them with the followingcommand:

Alternatively, if you’re not worried about keeping them, you can remove them.Compose just creates new ones.

Uninstallation

Docker Installation In Centos 7

To uninstall Docker Compose if you installed using curl:

To uninstall Docker Compose if you installed using pip:

Got a “Permission denied” error?

If you get a “Permission denied” error using either of the abovemethods, you probably do not have the proper permissions to removedocker-compose. To force the removal, prepend sudo to either of the abovecommands and run again.

Docker Installation On Centos 7 Usb

Where to go next

Centos Docker Update

Docker Install On Centos 7.7

Centos Docker Restart

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