Install Docker Rpm

2/13/2022by admin

Docker installation on Linux (CentOS 7) The most used installation type in production environment is to download the Linux package (a.rpm file) and to install it. This tutorial explains you how you can download this file and how you can install the Docker software. This Docker demo installation is done on CentOS 7. I have a docker container which was built by a keycloak image. I want to install vim in the container but I found that I need to have yum in order to install the vim.I tried to download yum from the internet and use rpm to install it, but the container didn't have sudo to let me change the file permission.

Aug 05, 2020 This tutorial provides a starting point on how to install Docker, create and run Docker containers on CentOS/RHEL 8/7, but barely scratches the surface of Docker. Step 1: Install and Configure Docker 1. Containers have revolutionized Applications deployment and massive scalability of microservices. Docker was a game-changer, simplifying the process of running and managing applications in containers. This article will guide you through the installation of Docker on RHEL 7. For CentOS 7, check Docker Installation on CentOS 7. 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. Mar 25, 2020 Angular is an frameworks, libraries, assets, and utilities. It keeps track of all the components and checks regularly for their updates. This tutorial will help you to install the Angular CLI tool on CentOS 8/7/6 and RHEL 8/7/6 Linux operating systems. Step 1 – Install Node.js First of all, you need to install node.js on.

Estimated reading time: 10 minutes

To get started with Docker Engine on CentOS, make sure youmeet the prerequisites, theninstall Docker.

Prerequisites

OS requirements

The official build of CentOS.

Install Docker Rpm

To install Docker Engine, you need a maintained version of CentOS 7 or 8.Archived versions aren’t supported or tested.

The centos-extras repository must be enabled. This repository is enabled bydefault, but if you have disabled it, you need tore-enable it.

The overlay2 storage driver is recommended.

Uninstall old versions

Older versions of Docker were called docker or docker-engine. If these areinstalled, uninstall them, along with associated dependencies.

It’s OK if yum reports that none of these packages are installed.

The contents of /var/lib/docker/, including images, containers, volumes, andnetworks, are preserved. The Docker Engine package is now called docker-ce.

Installation methods

You can install Docker Engine in different ways, depending on your needs:

  • Most usersset up Docker’s repositories and installfrom them, for ease of installation and upgrade tasks. This is therecommended approach.

  • Some users download the RPM package andinstall it manually and manageupgrades completely manually. This is useful in situations such as installingDocker on air-gapped systems with no access to the internet.

  • In testing and development environments, some users choose to use automatedconvenience scripts to install Docker.

Install using the repository

Before you install Docker Engine for the first time on a new host machine, you needto set up the Docker repository. Afterward, you can install and update Dockerfrom the repository.

Set up the repository

Install the yum-utils package (which provides the yum-config-managerutility) and set up the stable repository.

Optional: Enable the nightly or test repositories.

These repositories are included in the docker.repo file above but are disabledby default. You can enable them alongside the stable repository. The followingcommand enables the nightly repository.

To enable the test channel, run the following command:

You can disable the nightly or test repository by running theyum-config-manager command with the --disable flag. To re-enable it, usethe --enable flag. The following command disables the nightly repository.

Learn about nightly and test channels.

Install Docker Engine

  1. Install the latest version of Docker Engine and containerd, or go to the next step to install a specific version:

    If prompted to accept the GPG key, verify that the fingerprint matches060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35, and if so, accept it.

    Got multiple Docker repositories?

    If you have multiple Docker repositories enabled, installingor updating without specifying a version in the yum install oryum update command always installs the highest possible version,which may not be appropriate for your stability needs.

    Docker is installed but not started. The docker group is created, but no users are added to the group.

  2. To install a specific version of Docker Engine, list the available versionsin the repo, then select and install:

    a. List and sort the versions available in your repo. This example sorts results by version number, highest to lowest, and is truncated:

    The list returned depends on which repositories are enabled, and is specificto your version of CentOS (indicated by the .el7 suffix in this example).

    b. Install a specific version by its fully qualified package name, which is the package name (docker-ce) plus the version string (2nd column) starting at the first colon (:), up to the first hyphen, separated by a hyphen (-). For example, docker-ce-18.09.1.

    Docker is installed but not started. The docker group is created, but no users are added to the group.

  3. Start Docker.

  4. Verify that Docker Engine is installed correctly by running the hello-worldimage.

    This command downloads a test image and runs it in a container. When thecontainer runs, it prints an informational message and exits.

Docker Engine is installed and running. You need to use sudo to run Dockercommands. Continue to Linux postinstall to allownon-privileged users to run Docker commands and for other optional configurationsteps.

Upgrade Docker Engine

Install Docker Rpm Rhel

To upgrade Docker Engine, follow the installation instructions,choosing the new version you want to install.

Install from a package

If you cannot use Docker’s repository to install Docker, you can download the.rpm file for your release and install it manually. You need to downloada new file each time you want to upgrade Docker Engine.

  1. Go to https://download.docker.com/linux/centos/and choose your version of CentOS. Then browse to x86_64/stable/Packages/and download the .rpm file for the Docker version you want to install.

    Note: To install a nightly or test (pre-release) package,change the word stable in the above URL to nightly or test.Learn about nightly and test channels.

  2. Install Docker Engine, changing the path below to the path where you downloadedthe Docker package.

    Docker is installed but not started. The docker group is created, but nousers are added to the group.

  3. Start Docker.

  4. Verify that Docker Engine is installed correctly by running the hello-worldimage.

    This command downloads a test image and runs it in a container. When thecontainer runs, it prints an informational message and exits.

Docker Engine is installed and running. You need to use sudo to run Docker commands.Continue to Post-installation steps for Linux to allownon-privileged users to run Docker commands and for other optional configurationsteps.

Upgrade Docker Engine

Install docker rpm download

To upgrade Docker Engine, download the newer package file and repeat theinstallation procedure, using yum -y upgradeinstead of yum -y install, and pointing to the new file.

Install using the convenience script

Docker provides convenience scripts at get.docker.comand test.docker.com for installing edge andtesting versions of Docker Engine - Community into development environments quickly andnon-interactively. The source code for the scripts is in thedocker-install repository.Using these scripts is not recommended for productionenvironments, and you should understand the potential risks before you usethem:

  • The scripts require root or sudo privileges to run. Therefore,you should carefully examine and audit the scripts before running them.
  • The scripts attempt to detect your Linux distribution and version andconfigure your package management system for you. In addition, the scripts donot allow you to customize any installation parameters. This may lead to anunsupported configuration, either from Docker’s point of view or from your ownorganization’s guidelines and standards.
  • The scripts install all dependencies and recommendations of the packagemanager without asking for confirmation. This may install a large number ofpackages, depending on the current configuration of your host machine.
  • The script does not provide options to specify which version of Docker to install,and installs the latest version that is released in the “edge” channel.
  • Do not use the convenience script if Docker has already been installed on thehost machine using another mechanism.

This example uses the script at get.docker.com toinstall the latest release of Docker Engine - Community on Linux. To install the latesttesting version, use test.docker.com instead. Ineach of the commands below, replace each occurrence of get with test.

Warning:

Always examine scripts downloaded from the internet beforerunning them locally.

Docker Installation On Centos 7 Virtualbox

If you would like to use Docker as a non-root user, you should now consideradding your user to the “docker” group with something like:

Docker-rpm-builder

Remember to log out and back in for this to take effect!

Warning:

Install docker rpm centos 8

Adding a user to the “docker” group grants them the ability to run containerswhich can be used to obtain root privileges on the Docker host. Refer toDocker Daemon Attack Surfacefor more information.

Docker Engine - Community is installed. It starts automatically on DEB-based distributions. OnRPM-based distributions, you need to start it manually using the appropriatesystemctl or service command. As the message indicates, non-root users can’trun Docker commands by default.

Note:

To install Docker without root privileges, seeRun the Docker daemon as a non-root user (Rootless mode).

Rpm

Upgrade Docker after using the convenience script

If you installed Docker using the convenience script, you should upgrade Dockerusing your package manager directly. There is no advantage to re-running theconvenience script, and it can cause issues if it attempts to re-addrepositories which have already been added to the host machine.

Uninstall Docker Engine

  1. Uninstall the Docker Engine, CLI, and Containerd packages:

  2. Images, containers, volumes, or customized configuration files on your hostare not automatically removed. To delete all images, containers, andvolumes:

You must delete any edited configuration files manually.

Next steps

  • Continue to Post-installation steps for Linux.
  • Review the topics in Develop with Docker to learn how to build new applications using Docker.
requirements, apt, installation, centos, rpm, install, uninstall, upgrade, update

You can change Docker’s storage base directory (where container and images go) using the -g option when starting the Docker daemon.

  • Ubuntu/Debian: edit your /etc/default/docker file with the -g option: DOCKER_OPTS='-dns 8.8.8.8 -dns 8.8.4.4 -g /mnt'

  • Fedora/Centos: edit /etc/sysconfig/docker, and add the -g option in the other_args variable: ex. other_args='-g /var/lib/testdir'. If there’s more than one option, make sure you enclose them in ' '. After a restart, (service docker restart) Docker should use the new directory.

Using a symlink is another method to change image storage.

Caution - These steps depend on your current /var/lib/docker being an actual directory (not a symlink to another location).

Install Docker On Centos 7 Offline

  1. Stop docker: service docker stop. Verify no docker process is running ps faux
  2. Double check docker really isn’t running. Take a look at the current docker directory: ls /var/lib/docker/
    2b) Make a backup - tar -zcC /var/lib docker > /mnt/pd0/var_lib_docker-backup-$(date +%s).tar.gz
  3. Move the /var/lib/docker directory to your new partition: mv /var/lib/docker /mnt/pd0/docker
  4. Make a symlink: ln -s /mnt/pd0/docker /var/lib/docker
  5. Take a peek at the directory structure to make sure it looks like it did before the mv: ls /var/lib/docker/ (note the trailing slash to resolve the symlink)
  6. Start docker back up service docker start
  7. restart your containers

Everyone loves reaching the maximum number of available platforms for their software but this usually comes at a cost. In this article we will explain how we generated our packaging for Linux in an automated fashion, being faithful to our DevOps dogma.

Dockerize all the things!

Our team uses both Ubuntu and MacOS X in desktop machines and KrakenD has been running and behaving in the same way in all the platforms because from day one we decided to run everything on Docker. We use containers for all the software we produce and this is still true for the rest of our tooling (as what we are going to show today).

When it comes to generating RPM or DEB packages, choosing Docker ensures that anyone building or compiling a package will generate a consistent output.

Having Docker as the platform to work on, let’s see how to build the packages.

Install Docker Linux

Building packages the easy way using FPM

For those who don’t know fpm, this is the key piece for the package generation. According to their own intro:

The goal of fpm is to make it easy and quick to build packages

fpm is a tool written in Ruby that allows you to create packages for multiple platforms in a very easy way. Examples of the packages you can create are deb, rpm, tar and even Mac OS X .pkg, solaris, freebsd or pacman (ArchLinux).

Let’s get started by creating the fpm builder with a Dockerfile to generate the versions deb and rpm, the ones we were most interested in.

The Dockerfile for Debian/Ubuntu:

The Dockerfile for CentOS/Rhel:

Then build it and run it:

Notice that the FROM in each one uses a different OS (because fpm still needs rpmbuild, dpkg-deb and other tools).

Now the container is ready to package anything.

Source code:

  • Clone and build docker-fpm repository
  • Or run the docker fpm containers from Docker Hub.

Sign packages using PGP

If you want to distribute packages you’ll need to sign them using your PGP key. To do so you need to mount your .pgp directory in the container as a volume, as well as the rpmmacros configuration so the process has everything it needs.

The example uses some vars that we haven’t seen so far. Keep reading…

Write a Makefile

Unless your are OK with having an environment that suffers the diogenes syndrome, the next problem you want to face is managing what files go in which package version and leaving the house clean after compiling. How convenient is a Makefile to get that!

Makefile variables, example:

Then every specific option for fpm is also added to the Makefile:

Now all the options and variables are controlled inside the Makefile.

Pattern-specific variables

A key of success are the pattern-specific variables present in the Makefile. They are used to define a kind of template that can be reused many times (as a function) but with different declarations.

A single platform would be easy to manage: one config file, a couple of scripts (pre and post install) and the systemd configuration. That’s it.

For us the problem came when we wanted to generate packages for old versions of Ubuntu/Debian and CentOS/RHEL. Some distributions were using upstart while others created scripts in init.d or needed custom scripts for pre and post installations. Differences never ended.

The use of the pattern-specific variables fixes in a simple way the problem (and using something it’s been there for years), this is how we completed the Makefile.

We defined all the files that might be needed during the package creation:

When declaring the file using the full path, the directory will be created and the file will be copied inside, generating this way the skeleton for that specific version.In addition, it will save you from having to manually maintain that skel, because it is generated every time is needed, copying the “latest” available versions of them.

Testing your packages

The last step before releasing to the world the packages just created is to test they work properly. There are many ways and strategies to do that and we are not going to show you how, but for us it worked to run a docker container with the OS version we wanted to try and install inside the generated package.

With this done, it is very easy to check that the pre and post installation scripts worked correctly as well as the installation and the service operation.

We did a simple shell script (not being able to invest more time in something elegant and reusable) and a Dockerfile template where the package gets copied and a new container is generated tagged with the version of the package. By specifying the package version as a tag in the docker image, executing docker images will list all the generated packages ready to test!

Dockerfile testing:

Testing script:

Makefile:

Conclusion

Install Docker Rpm Download

We have seen through several examples how we automated the generation of package files for KrakenD. You can quickly adapt this scripts and containers to your own application and start producing packages in a more automated way. With the combination of the provided Makefile and fpm you will be able to distribute your application to several distributions.

Enjoy!

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