Скачать или смотреть How to install kubernetes on linux

All-in-One Installation of Kubernetes and KubeSphere on Linux Centos 7
Kubernetes is designed for its control plane to run on Linux. Within your cluster you can run applications on Linux
#Kubernetes #Automated_Management



1- configure hostnames ( hostnamectl set-hostname name )

2- configue hosts
#vi /etc/hosts
( ip hostname)

3- install continer engine for all nodes
curl -fsSL https://get.docker.com/ | sh

192.168.154.140 master
192.168.154.141 w01
192.168.154.142 w02

4- configure repolist for k8s :
vim /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum...
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://packages.cloud.google.com/yum... https://packages.cloud.google.com/yum...

5- install kubelet and kubeadm and kubectl
yum install kubelet kubeadm kubectl -y

6- enable and start kubelet
systemctl start kubelet
systemctl enable kubelet


7- disaple or open ports for k8s of k8s.
systemctl stop firewalld
systemctl disable firewalld


8- vim /etc/sysctl.d/k8s.conf create file
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1


9- sysctl --system reload connection


Applying /etc/sysctl.d/99-sysctl.conf ...
Applying /etc/sysctl.d/k8s.conf ...
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
Applying /etc/sysctl.conf ...



10- disable SElinux and update your firewall rules.
setenforce 0
vim /etc/selinux/config SELINUX=disabled change to disabled if not disabled
getenforce to make sure selinx is permissive


11- turn off swap
swapoff -a
sed -i '/swap/d' /etc/fstab
free -m make sure swap zeros

12- the problem of connection refused :

vim /etc/docekr/daemon.json

{
"exec-opts": ["native.cgroupdriver=systemd"]
}

========================================
after that restart the docker
systemctl restart docker
#kubeadm reset -f



================ Master ========================

1- setup cluster required for machine :
1- ( 2 cpu ) 2- ( 2 or above RAM )
[ERROR NumCPU]: the number of available CPUs 1 is less than the required 2 [ERROR Mem]: the system RAM (972 MB) is less than the minimum 1700 MB

kubeadm
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config


2- to get the kubeadm join command :
kubeadm token create --print-join-command

3- to know how many nodes joined in your master :
kubectl get nodes

number 4 after joining nodes

4-install k8s weave:
export kubever=$(kubectl version | base64 | tr -d '\n')
kubectl apply -f https://cloud.weave.works/k8s/net?k8s...

verify :

kubelet get nodes

all is ready after 20 sec
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
================= nodes ==================+++=============

kubeadm reset -f
systemctl restart docker
#reboot

1- join to master with join command from point ( 2 in Master)

for example :

kubeadm join 192.168.154.140:6443 --token t7tzfr.vwv7k5aub0cdcrfz --discovery-token-ca-cert-hash sha256:e864c450f2a5d122d9e938d8b9ebc4bcc9b824e17762a3774514d58112050660