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Introduction
Setting up a Kubernetes Cluster
There are several ways how to set up a Kubernetes Cluster. Find an example from the following chapters.
The basic step which can be followed to install the Kubernetes cluster on Centos are:
Install Docker on all CentOS 7 VMs
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Update the package database
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sudo yum check-update |
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Install the dependencies
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sudo yum install -y yum-utils device-mapper-persistent-data lvm2 |
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Add and enable the official Docker Repository to CentOS 7
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sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo |
Install the latest Docker version on CentOS 7
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sudo yum install docker-ce |
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A successful installation output will be concluded with a Complete!You may be prompted to accept the GPG key. This is to verify that the fingerprint matches. The format will look as follows. If correct, accept it.
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060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35 |
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Manage Docker service
Now Docker is installed, but the service is not yet running. Start and enable Docker using the commands.
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sudo systemctl start docker
sudo systemctl enable docker |
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To confirm that Docker is active and running use:
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sudo systemctl status docker |
Set up the Kubernetes Repository
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Since the Kubernetes packages aren’t present in the official CentOS 7 repositories, we will need to add a new repository file. Use the following command to create the file and open it for editing:
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sudo vi /etc/yum.repos.d/kubernetes.repo |
Once the file is open, press I key to enter insert mode, and paste the following contents:
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[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg |
Once pasted, press escape to exit insert mode. Then enter :x to save the file and exit.
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Install Kubelet on CentOS 7
The first core module that we need to install on every node is Kubelet. Use the following command to do so:
Code Block sudo yum install -y kubelet
Install kubeadm and kubectl on CentOS 7
kubeadm, the next core module, which has to be installed. Use the following command:
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sudo yum install -y kubeadm |
(Note that kubeadm automatically installs kubectl as a dependency)
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Deployment Files
Deployment File
=> insert the example file
=> add explanations for specific settings
Service File
=> insert the example file
=> add explanations for specific settings
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Overview
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