preface

The previous articles were mostly about how to use K8S, and did not talk much about k8S cluster installation. This article is arranged, and it does not use the official installation method, but Rancher.

Rancher is an open source software platform that enables organizations to run and manage Docker and Kubernetes in production. With Rancher, organizations no longer need to build container service platforms from scratch using a unique set of open source technologies. Rancher provides the entire software stack needed to manage containers in production.

The environment

The host name ip role
mldong01 192.168.0.245 master
mldong02 192.168.0.54 node01
mldong03 192.168.0.22 node02

Three hosts are HUAWEI ECS, CentOS Linux release 7.6.1810 (Core)

Install the docker

Slightly, can refer to the previous article installation.

Docker version is 19.03.11

All three nodes are installed

Run Rancher through Docker

The current version is the latest: V2.4.8

Master Node Installation

sudo docker run  --privileged -d --restart=unless-stopped \
  -p 80:80 -p 443:443 \
  rancher/rancher:latest
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Browser access (public IP address) :

https://192.168.0.245

Keep going.

Set the admin password and agree to the protocol

Successful installation

Let’s set the language

Start adding a K8S cluster using Rancher

  1. The top right cornerAdd the cluster

  1. Select Custom

  1. Enter a cluster name and selectV1.18.8 rancher1-1, other default first, next step

  1. Configure the command based on the server situation, and then copy the command to the SSH terminal of the host

  1. Total three nodesmaster,node01,node02Obtain commands to execute separately.

The installation process takes a long time. You can view the installation progress by clicking the host

Installation successful!

validation

The following operations are performed on the master

  1. Add kubernetes’ yum source

    cat >> /etc/yum.repos.d/kubernetes.repo <<EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
EOF
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  2. Install kubectl

yum install -y kubectl
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  1. Cluster ->Kubeconfig file -> Copy to clipboard
[root@mldong01 ~] vi /root/.kube/config
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Publish a service on Rancher

  1. Add a project

    A project is a concept in Rancher that can be understood as a directory.

  2. Add a namespace

    This is the same as the k8S namespace

  3. Into the project

  4. Deploying a service

  5. Viewing host Ports

  6. Go to Huawei cloud console to open port permissions, move the mouse up, and see the corresponding server IP address in the lower left corner

  7. Of course, direct access to the port is definitely not friendly, so we add a DNS resolution record, resolve to the above IP, and then configure load balancing

  8. Browser access

summary

The whole article does not involve the tedious installation steps of K8S, Rancher tool has helped us to do, really save a lot of trouble. If I have free time, I will use Rancher to publish a complete service – article.

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