kubernetes-v1.12.2环境安装

参考版本：
Centos 7.6
kubernetes-v1.12.2

参考官方文档：

Installing kubeadm

Creating a single master cluster with kubeadm

准备

设置SELinux模式为Permissive

setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

关闭Swap

检查Swap是否启用

cat /proc/meminfo | grep Swap

关闭Swap

swapoff -a

删除/etc/fstab中swap相关的内容，并重新mount

mount -a

关闭firewalld

systemctl stop firewalld
systemctl disable firewalld

安装kubeadm

新增yum repository

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

注:官方文档中exclude=kube*行需要删除

更新yum cache (如果需要)

yum clean all && yum makecache fast

获取可安装的版本列表

yum --showduplicates list kubeadm

安装kubeadm,kubelet,kubectl

(以1.12.2为例)

yum install kubeadm-1.12.2-0 kubelet-1.12.2-0 kubectl-1.12.2-0

配置服务

systemctl enable kubelet.service

检查安装

kubeadm version
kubectl version
kubelet --version

安装master节点

下载镜像(可以跳过。如果跳过，将在init时下载)
(以1.12.2为例)

kubeadm config images pull --kubernetes-version=v1.12.2

初始化Master
(以1.12.2为例)

kubeadm init --pod-network-cidr=10.244.0.0/16 --kubernetes-version=v1.12.2

输出结果

Your Kubernetes master has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

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

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of machines by running the following on each node
as root:

kubeadm join 192.168.3.101:6443 --token uuduxx.3x2h3dw8vogwb0eo --discovery-token-ca-cert-hash sha256:ca2a9bca1621f9bc25667832f7823f3e3fef68c220ed55104599803bfcbc8071

复制kubectl连接配置

mkdir ~/.kube
cp /etc/kubernetes/admin.conf ~/.kube/config

检查安装

kubectl get nodes

安装Minion节点

下载镜像(可以跳过。如果跳过，将在init时下载)
(以1.12.2为例)

kubeadm config images pull --kubernetes-version=v1.12.2

初始化Minion节点
需要根据kubeadm init的输出修改

kubeadm join 192.168.3.101:6443 --token uuduxx.3x2h3dw8vogwb0eo --discovery-token-ca-cert-hash sha256:ca2a9bca1621f9bc25667832f7823f3e3fef68c220ed55104599803bfcbc8071

检查安装

kubectl get nodes

安装flannel

下载flannel部署文件

wget https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml

修改配置文件(暂不需要修改)

部署

kubectl apply -f kube-flannel.yml