系統分層

就像Linux擁有內核（kernel）、核心系統類庫、和可選的用戶級工具，kubernetes也擁有功能和工具的層次。對於開發者來說，理解這些層次是非常重要的。kubernetes APIs、概念和功能都在下面的層級圖中得到體現。

環境配置

增加節點DNS 別名

cat <<EOF >>/etc/hosts

192.168.209.160 k8a

192.168.209.172 k8b

192.168.209.173 k8c

EOF

驗證下ping k8b && ping k8c

復制hosts到其他節點

scp /etc/hosts root@k8b:/etc/hosts

scp /etc/hosts root@k8c:/etc/hosts

添加kube-master到kube-node的秘鑰認證

ssh-keygen

ssh-copy-id hostname

在k8a上驗證下ssh key

ssh k8b

ssh k8c

關閉SELinux sed -i ‘s#SELINUX=enforcing#SELINUX=disabled#g‘ /etc/selinux/config setenforce 0

關閉系統防火墻

systemctl stop firewalld

systemctl disable firewalld

關閉sawp分區 swapoff -a vi /etc/fstab 註釋掉swap分區 #/dev/mapper/cl-swap swap swap defaults 0 0

腳本

swapoff -a && sysctl -w vm.swappiness=0

添加配置內核參數/etc/sysctl.d/k8s.conf文件

cat > /etc/sysctl.d/k8s.conf <<EOF

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

net.ipv4.conf.all.forwarding = 1

vm.swappiness = 0

EOF

sysctl -p /etc/sysctl.d/k8s.conf

更新依賴庫

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

增加淘寶docker源

yum-config-manager --add-repo? http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum makecache fast

yum install -y docker-ce

啟動docker

systemctl enable docker && systemctl start docker

增加淘寶k8s源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo

[kubernetes]

name=Kubernetes

baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/

enabled=1

gpgcheck=1

repo_gpgcheck=1

gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

EOF

安裝k8s 組件

yum install -y kubeadm kubectl kubelet

master節點啟動組件

systemctl enable kubelet && systemctl start kubelet

驗證版本

kubeadm version

Kubernetes 安裝