单节点愉快部署 Kubernetes-1.13.2

环境清单

  • 系统:Ubuntu-18.04.1(阿里云东京节点)
  • Kubernetes版本: 1.13.2
  • Docker版本: 18.06-ce

Docker 版本不得高于18.06版本,否则 初始化时会提示 "WARNING")

准备工作

  • 关闭swap
sudo swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
  • 内核参数配置
$ cat <<EOF | sudo tee - /etc/sysctl.d/docker.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

$ sudo sysctl --system

安装Docker环境

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

在安装Docker版本时,apt缺省情况下会安装最新版本,然Kubernettes 对Docker版本最高的支持是18.06

$ sudo apt-cache madison docker-ce
 docker-ce | 5:18.09.1~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
 docker-ce | 5:18.09.0~3-0~ubuntu-bionic | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
 docker-ce | 18.06.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
 docker-ce | 18.06.0~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
 docker-ce | 18.03.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
 
$ sudo apt update && sudo apt install docker-ce=18.06.1~ce~3-0~ubuntu

更多参考: https://docs.docker.com/install/linux/docker-ce/ubuntu/
国内建议使用阿里云镜像

安装 kubernetes

$ sudo apt-get update && sudo apt-get install -y apt-transport-https && curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
$ echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list.d/kubernetes.list && sudo apt-get update
$ sudo apt install -y kubeadm  kubelet kubernetes-cni
  • 初始化
$ sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=$(hostname -i) --service-dns-domain=k8s.local --kubernetes-version=v1.13.2

国内环境无法直接访问gcr.io,可以使用其它方式,如在初始化的时候阿里云构建的镜像:

--image-repository=registry.cn-shenzhen.aliyuncs.com/shuhui \
  • 加入到集群(这里为单节点,不需要执行此命令)
kubeadm join $(hostname -i):6443 --token <token> --discovery-token-ca-cert-hash sha256:<hash>
  • 导入配置文件到当前用户目录

    • 普通用户
    mkdir $HOME/.k8s
    sudo cp /etc/kubernetes/admin.conf $HOME/.k8s/
    sudo chown $(id -u):$(id -g) $HOME/.k8s/admin.conf
    export KUBECONFIG=$HOME/.k8s/admin.conf
    echo "export KUBECONFIG=$HOME/.k8s/admin.conf" | tee -a ~/.bashrc
    
    • root用户(不推荐)
    export KUBECONFIG=/etc/kubernetes/admin.conf
    
  • 部署网络

$ kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
$ kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
  • 为 master节点添加污点,该命令允许将pod安排在Kubernetes主服务器上运行。
$ kubectl taint nodes --all node-role.kubernetes.io/master-
  • 查看运行的服务
$ kubectl get all -n kube-system
NAME                                          READY   STATUS    RESTARTS   AGE
pod/coredns-86c58d9df4-9b6xq                  1/1     Running   0          8m59s
pod/coredns-86c58d9df4-lttq4                  1/1     Running   0          8m59s
pod/etcd-k8s-lib.vqiu.cn                      1/1     Running   0          8m2s
pod/kube-apiserver-k8s-lib.vqiu.cn            1/1     Running   0          8m18s
pod/kube-controller-manager-k8s-lib.vqiu.cn   1/1     Running   0          8m
pod/kube-flannel-ds-amd64-spqjc               1/1     Running   0          6m
pod/kube-proxy-kssqg                          1/1     Running   0          8m58s
pod/kube-scheduler-k8s-lib.vqiu.cn            1/1     Running   0          8m15s

NAME               TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
service/kube-dns   ClusterIP   10.96.0.10   <none>        53/UDP,53/TCP   9m13s

NAME                                     DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                     AGE
daemonset.apps/kube-flannel-ds-amd64     1         1         1       1            1           beta.kubernetes.io/arch=amd64     6m
daemonset.apps/kube-flannel-ds-arm       0         0         0       0            0           beta.kubernetes.io/arch=arm       6m
daemonset.apps/kube-flannel-ds-arm64     0         0         0       0            0           beta.kubernetes.io/arch=arm64     6m
daemonset.apps/kube-flannel-ds-ppc64le   0         0         0       0            0           beta.kubernetes.io/arch=ppc64le   6m
daemonset.apps/kube-flannel-ds-s390x     0         0         0       0            0           beta.kubernetes.io/arch=s390x     6m
daemonset.apps/kube-proxy                1         1         1       1            1           <none>                            9m13s

NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/coredns   2/2     2            2           9m13s

NAME                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/coredns-86c58d9df4   2         2         2       8m59s

部署一个测试应用

$ kubectl run guids --generator=run-pod/v1 --image=alexellis2/guid-service:latest --port 9000
kubectl get pods -o wide
NAME    READY   STATUS    RESTARTS   AGE   IP           NODE              NOMINATED NODE   READINESS GATES
guids   1/1     Running   0          68s   10.244.0.5   k8s-lib.vqiu.cn   <none>           <none>

$ kubectl describe pods guids | grep IP:
IP:                 10.244.0.5
$ curl 10.244.0.5:9000/guid
{"guid":"ede2f14a-884a-409a-85bc-064857cccd1c","container":"guids"}

部署dashboard

  • 创建dashboard
$ kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/aio/deploy/recommended/kubernetes-dashboard.yaml
  • 创建 token供 dashboard授权

命令方式

$ kubectl create serviceaccount dashboard
$ kubectl create clusterrolebinding dashboard-admin -n default  --clusterrole=cluster-admin  --serviceaccount=default:dashboard

源码

$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ServiceAccount
metadata:
  name: dashboard-admin
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: dashboard-admin
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: dashboard-admin
  namespace: kube-system
EOF

目前为止,可以在本机使用http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/#!/login这个URL来访问,但这样比较麻烦,我们需要进行映射到公网。

$ kubectl -n kube-system edit service kubernetes-dashboard

ClusterIP更改为 NodePort

获取Token

kubectl get secret $(kubectl get serviceaccount dashboard -o jsonpath="{.secrets[0].name}") -o jsonpath="{.data.token}" | base64 --decode
或
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep dashboard-admin | awk '{print $1}')
  • 浏览器访问

使用 https://IP:32619/ 进行访问

----_2019-01-25T06-36-51.415Z

参考引用: