kubeadm安装k8s

软件版本：

kubelet：V1.13.3

docker： 18.06.1

实验环境：

Centos 7.5.1804

说明：

初学。安装步骤参考了阿良的文档，并做了部分修改。

步骤如下：

1、关闭防火墙:

$ systemctl stop firewalld

$ systemctl disable firewalld

 

2、关闭selinux:

$ sed -i 's/enforcing/disabled/' /etc/selinux/config 

$ setenforce 0

 

3、关闭swap:

$ swapoff -a $ 临时

$ vim /etc/fstab $ 永久

sed -ri 's/.*swap.*/#&/' /etc/fstab

 

4、添加主机名与IP对应关系(记得设置主机名): 

$ cat /etc/hosts

192.168.0.11 k8s-master 

192.168.0.12 k8s-node1

192.168.0.13 k8s-node2

 

5、将桥接的IPV4流量传递到iptables的链

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

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

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

EOF

$ sysctl --system

 

6、安装docker

$ wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo

$ yum -y install docker-ce-18.06.1.ce-3.el7

$ systemctl enable docker && systemctl start docker

$ docker --version

Docker version 18.06.1-ce, build e68fc7a

 

7、添加阿里云源

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

 

8、安装kubeadm,kubelet,kubectl(所有节点安装docker,kubeadm,kubelet)

yum install -y kubelet-1.13.3 kubeadm-1.13.3 kubectl-1.13.3 kubernetes-cni-0.6.0

systemctl enable kubelet

 

9、部署k8s master

kubeadm init \

  --apiserver-advertise-address=192.168.0.11 \

  --image-repository registry.aliyuncs.com/google_containers \

  --kubernetes-version v1.13.3 \

  --service-cidr=10.1.0.0/16\

  --pod-network-cidr=10.244.0.0/16

 

10、使用kubectl工具

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl get nodes

 

11、安装pod网络插件（CNI）

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

sed -i 's/quay.io\/coreos/registry.cn-beijing.aliyuncs.com\/imcto/g' kube-flannel.yml

kubectl apply -f kube-flannel.yml

 

12、加入kubernetes node

向集群添加新节点，执行在kubeadm init输出的kubeadm join命令：

$  kubeadm join 192.168.31.64:6443 --token l79g5t.6ov4jkddwqki1dxe --discovery-token-

ca-cert-hash sha256:4f07f9068c543130461c9db368d62b4aabc22105451057f887defa35f47fa076

 

13、部署dashboard

wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml

修改镜像地址为 reg.qiniu.com/k8s/kubernetes-dashboard-amd64:v1.8.3

默认Dashboard只能集群内部访问，修改Service为NodePort类型，暴露到外部:

kind: Service

apiVersion: v1

metadata:

  labels:

    k8s-app: kubernetes-dashboard

  name: kubernetes-dashboard

  namespace: kube-system

spec:

  type: NodePort

  ports:

    - port: 443

      targetPort: 8443

      nodePort: 30001

  selector:

    k8s-app: kubernetes-dashboard

$ kubectl apply -f kubernetes-dashboard.yaml

访问地址:https://NodeIP:30001

 

14、创建service account并绑定默认cluster-admin管理员集群角色:

kubectl create serviceaccount dashboard-admin -n kube-system

kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin

kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')

 

15、使用输出的token登录Dashboard。

 

16、使用kubeconfig登录Dashboard

# 获取dashboard-admin的name

kubectl describe secret -n kube-system dashboard-admin

# 把dashboard的token放入变量，方便后面调用（这里的token是base64编码，此处需要进行解码操作）

DASH_TOCKEN=$(kubectl get secret -n kube-system dashboard-admin-token-sj7kl -o jsonpath={.data.token}|base64 -d)

# 配置上下文和当前上下文

kubectl config set-cluster kubernetes --server=192.168.0.11:6443 --kubeconfig=/root/dashbord-admin.conf

kubectl config set-credentials dashboard-admin --token=$DASH_TOCKEN --kubeconfig=/root/dashbord-admin.conf

kubectl config set-context dashboard-admin@kubernetes --cluster=kubernetes --user=dashboard-admin --kubeconfig=/root/dashbord-admin.conf

kubectl config use-context dashboard-admin@kubernetes --kubeconfig=/root/dashbord-admin.conf

 

17、使用dashbord-admin.conf登录kube_dashboard