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home/Knowledge Base/Dedicated Servers/Linux Guides/Install Rancher on CentOS 7
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Install Rancher on CentOS 7

21 views 0 December 6, 2019 Updated on December 27, 2019 aklwebhost

Introduction

Rancher is an open source platform for running containers and building a private container service. Rancher is based on Docker, so you can run it on a dedicated box, KVM machine or even on a LXC container. Rancher provides a huge library of applications which are installed within a few clicks and also supports docker images from Dockerhub.

Requirements

  • A AKLWEB Host Dedicated Server with CentOS 7 x64.
  • At least 1GB memory.
  • A supported version of Docker.

Install Docker

As stated, Docker is required to run Rancher, so we will install it first.

First, remove any old Docker files, if necessary.

sudo yum remove docker docker-common docker-selinux docker-engine

Note: You may get a report that no Docker files are installed. This is safe to ignore.

Install required packages.

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

Add a stable repo.

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Check the available versions of Docker CE.

yum list docker-ce --showduplicates | sort -r

You will see output similar to the following text.

...
docker-ce.x86_64            17.09.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.0.ce-1.el7.centos             docker-ce-stable
...

You can install the latest version of Docker CE simply using the sudo yum install docker-ce command, but in a production environment, it is recommended that you install a specific version rather than the latest version.

To specify the version of Docker CE to install, append the version-string, (second column), of the latest stable version to the package name followed by a “-“, as shown in the following command.

sudo yum install docker-ce-17.09.1.ce-1.el7.centos

Start Docker.

sudo systemctl start docker

Verify that Docker installed correctly.

sudo docker run hello-world

This command runs a test image in a test container to print a message, then exits. The message will be similar to the following output.

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

Install Rancher

Now we’re are ready to install Rancher.

sudo docker run -d --restart=unless-stopped -p 8080:8080 rancher/server:stable

Wait a few minutes to allow the Rancher UI to boot. Then, open your favorite browser and go to port 8080 on your server.

http://192.0.2.0:8080

Be sure to replace 192.0.2.0 with your actual server’s IP address.

Rancher doesn’t configure access control by default, so it is important to set this up immediately, otherwise the UI and API can be accessed by anyone who has your IP.

Hover over the ADMIN tab, and click Access Control.

Follow the instructions in the Rancher UI to set up whichever form of access control you prefer.

Conclusion

Everything is now installed and you can begin to configure Rancher. For more in-depth information on configuring and using Rancher, visit their official documentation.

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