11. 附录 - Play-With-Kubernetes

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2023-12-01

Play with Kubernetes提供了一个免费的Kubernets体验环境，每次创建的集群最长可以使用4小时。

集群初始化

打开play-with-k8s.com，点击”ADD NEW INSTANCE”，并在新INSTANCE（名字为node1）的TERMINAL中初始化kubernetes master：

$ kubeadm init --apiserver-advertise-address $(hostname -i)
Initializing machine ID from random generator.
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
[init] Using Kubernetes version: v1.7.0
[init] Using Authorization modes: [Node RBAC]
[preflight] Skipping pre-flight checks
[certificates] Generated CA certificate and key.
[certificates] Generated API server certificate and key.
[certificates] API Server serving cert is signed for DNS names [node1 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.0.1.3]
[certificates] Generated API server kubelet client certificate and key.
[certificates] Generated service account token signing key and public key.
[certificates] Generated front-proxy CA certificate and key.
[certificates] Generated front-proxy client certificate and key.
[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[apiclient] Created API client, waiting for the control plane to become ready
[apiclient] All control plane components are healthy after 25.001152 seconds
[token] Using token: 35e301.77277e7cafee013c
[apiconfig] Created RBAC rules
[addons] Applied essential addon: kube-proxy
[addons] Applied essential addon: kube-dns
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run (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:
  http://kubernetes.io/docs/admin/addons/
You can now join any number of machines by running the following on each node
as root:
  kubeadm join --token 35e301.77277e7cafee013c 10.0.1.3:6443
Waiting for api server to startup...........
Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply
daemonset "kube-proxy" configured

注意：记住输出中的kubeadm join --token 35e301.77277e7cafee013c 10.0.1.3:6443命令，后面会用来添加新的节点。

配置kubectl

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

初始化网络

kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d 'n')"

创建Dashboard

curl -L -s https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml  | sed 's/targetPort: 9090/targetPort: 9090n  type: LoadBalancer/' | kubectl apply -f -

稍等一会，在页面上方会显示Dashborad服务的端口号，点击端口号就可以访问Dashboard页面。

添加新的节点

点击”ADD NEW INSTANCE”，并在新INSTANCE的TERMINAL中输入前面第一步记住的kubeadm join命令，如

kubeadm join --token 35e301.77277e7cafee013c 10.0.1.3:6443

回到node1的TERMINAL，输入kubectl get node即可查看所有Node的状态。等所有Node状态都变成Ready后，整个Kubernetes集群都搭建好了。