# 第一次使用 Play with Kubernetes ### Play with Kubernetes 這個世間就是這麼漂亮，都有此 PWK 工具網站可以練習 K8s\ 此網站工具僅需具備 github or Docker 帳號即可登入使用～\ 登入後，先點選左邊畫面 ***+ ADD NEW INSTANCE***，新增節點 ![＋ADD NEW INSTANCE](/files/-LQnpU4yRcw9u9axrr73) ### 初始化 新增後，Terminal 中就有初始化說明 ```bash 1. Initializes cluster master node: kubeadm init --apiserver-advertise-address $(hostname -i) 2. Initialize cluster networking: kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 |tr -d '\n')" 3. (Optional) Create an nginx deployment: kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx-app.yaml The PWK team. ``` ### Node join 開始進行基本初始化步驟 1 ```bash 1. Initializes cluster master node: kubeadm init --apiserver-advertise-address $(hostname -i) ........<忽略>........ [addons] Applied essential addon: CoreDNS [addons] Applied essential addon: kube-proxy Your Kubernetes master has initialized successfully! ``` 完成 Master node 初始化節點之後，進行步驟 2 ```bash # 2. Initialize cluster networking: [node1 ~]$ kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 |tr -d '\n')" serviceaccount/weave-net created clusterrole.rbac.authorization.k8s.io/weave-net created clusterrolebinding.rbac.authorization.k8s.io/weave-net created role.rbac.authorization.k8s.io/weave-net created rolebinding.rbac.authorization.k8s.io/weave-net created daemonset.extensions/weave-net created [node1 ~]$ ``` 當完成上面步驟 1.`Initializes cluster master node`之後，此 instance 即成為 **Master node**\ 步驟完成後，會提供`kubectl join`指令（如下）\ `kubeadm join 192.168.0.13:6443 --token 6bcc6s.zkvi8hv0hhpxkd1v --discovery-token-ca-cert-hash sha256:9ceb947c39b2a4e10396d846dfda4cba9d27958ee687eb9b406cff0400f27223`\ \ 此時於左邊環境繼續 ***+ ADD NEW INSTANCE***，例如新增三個 K8s node\ 透過`kubectl join`指令將三個新 instance join 到第一台 instance 成為 work-nodes。\ 新增後，在 Master node 上，查看資訊： ```bash [node1 ~]$ kubectl get node NAME STATUS ROLES AGE VERSION node1 Ready master 4m v1.11.3 node2 Ready 2m v1.11.3 node3 Ready 1m v1.11.3 node4 Ready 58s v1.11.3 [node1 ~]$ ``` ### 部署範例 Nginx 當進行 Create an nginx deployment 時，就會依據此 nginx-app.yaml 進行創建 deployment、service、endpoint、pod 等角色物件。 ```bash [node1 ~]$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx-app.yaml service/my-nginx-svc created deployment.apps/my-nginx created [node1 ~]$ # 創建 services、pod 初期 pending 狀態 [node1 ~]$ kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 443/TCP 8m my-nginx-svc LoadBalancer 10.107.145.35 80:30997/TCP 28s [node1 ~]$ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-67594d6bf6-f94cb 0/1 ContainerCreating 0 42s my-nginx-67594d6bf6-tfpg5 0/1 ContainerCreating 0 42s my-nginx-67594d6bf6-trps7 0/1 ContainerCreating 0 42s # 完成創建 pod 後狀態：Running [node1 ~]$ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-67594d6bf6-f94cb 1/1 Running 0 1m my-nginx-67594d6bf6-tfpg5 1/1 Running 0 1m my-nginx-67594d6bf6-trps7 1/1 Running 0 1m ``` 完成部署此服務時，透過 kubectl 取得各物件資訊 ```bash # deployments [node1 ~]$ kubectl get deployments NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE my-nginx 3 3 3 3 1m # services [node1 ~]$ kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 443/TCP 9m my-nginx-svc LoadBalancer 10.107.145.35 80:30997/TCP 1m [node1 ~]$ # endpoints [node1 ~]$ kubectl get endpoints -o wide NAME ENDPOINTS AGE kubernetes 192.168.0.13:6443 19m my-nginx-svc 10.32.0.2:80,10.40.0.2:80,10.44.0.2:80 10m [node1 ~]$ # pods [node1 ~]$ [node1 ~]$ kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE my-nginx-67594d6bf6-f94cb 1/1 Running 0 10m 10.44.0.2 node3 my-nginx-67594d6bf6-tfpg5 1/1 Running 0 10m 10.40.0.2 node2 my-nginx-67594d6bf6-trps7 1/1 Running 0 10m 10.32.0.2 node4 ``` 完成部署後，在 “Play with Kubernetes” 介面上有個隨機性數字 [30997 藍色](http://ip172-18-0-35-bfi2iocgi22g00auk1vg-30997.direct.labs.play-with-k8s.com/)連結\ ps. 此藍色數字，是依據 Services 所隨機配置的外部 PORT。\ 點選連結後，即可看見 Nginx 服務的歡迎畫面。 ![](/files/-LQnv-t-G71lV2_Gjwp8) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://fufu.gitbook.io/kk8s/first-play-with-k8s.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.