摘要:查看版本查看節點部署說明提供名稱和鏡像地址鏡像地址再如查看測試獲取名字測試使用進行故障排除主要使用如下命令列出資源顯示資源詳情打印中的日志在中的上執行命令獲取應用配置查看應用是否在運行查看中有哪些結
查看版本
kubectl version查看節點
kubectl get nodes部署app
說明: 提供deployment名稱和app鏡像地址(docker鏡像地址)
kubectl run kubernetes-bootcamp --image=gcr.io/google-samples/kubernetes-bootcamp:v1 --port=8080
再如:
run test --image=preparedman/mytomcat:tagname --port=8088查看app
kubectl proxy
測試:curl http://localhost:8001/version
{ "major": "1", "minor": "13", "gitVersion": "v1.13.3", "gitCommit": "721bfa751924da8d1680787490c54b9179b1fed0", "gitTreeState": "clean", "buildDate": "2019-02-01T20:00:57Z", "goVersion": "go1.11.5", "compiler": "gc", "platform": "linux/amd64" }
獲取pod名字
export POD_NAME=$(kubectl get pods -o go-template --template "{{range .items}}{{.metadata.name}}{{" "}}{{end}}")
測試:echo Name of the Pod: $POD_NAME
使用kubectl進行故障排除主要使用如下命令
kubectl get - list resources 列出資源 kubectl describe - show detailed information about a resource 顯示資源詳情 kubectl logs - print the logs from a container in a pod 打印`pod` 中container的日志 kubectl exec - execute a command on a container in a pod 在`pod`中的container上執行命令獲取應用配置
查看應用是否在運行
kubectl get pods
查看pod 中有哪些container
kubectl describe pods
結果如下:
Name: kubernetes-bootcamp-6bf84cb898-jk4jc Namespace: default Priority: 0 PriorityClassName:打印container日志Node: minikube/172.17.0.72 Start Time: Wed, 24 Apr 2019 13:21:58 +0000 Labels: pod-template-hash=6bf84cb898 run=kubernetes-bootcamp Annotations: Status: Running IP: 172.18.0.4 Controlled By: ReplicaSet/kubernetes-bootcamp-6bf84cb898 Containers: kubernetes-bootcamp: Container ID: docker://55491b363d26b62e432cd4841ed4f65cc5b98e645d172c6ed88feaebcb4ec06c Image: gcr.io/google-samples/kubernetes-bootcamp:v1 Image ID: docker-pullable://jocatalin/kubernetes-bootcamp@sha256:0d6b8ee63bb57c5f5b6156f446b3bc3b3c143d233037f3a2f00e279c8fcc64af Port: 8080/TCP Host Port: 0/TCP State: Running Started: Wed, 24 Apr 2019 13:22:00 +0000 Ready: True Restart Count: 0 Environment: Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-l7v8b (ro) Conditions: Type Status Initialized True Ready True ContainersReady True PodScheduled True Volumes: default-token-l7v8b: Type: Secret (a volume populated by a Secret) SecretName: default-token-l7v8b Optional: false QoS Class: BestEffort Node-Selectors: Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s node.kubernetes.io/unreachable:NoExecute for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Scheduled 3m6s default-scheduler Successfully assigned default/kubernetes-bootcamp-6bf84cb898-jk4jc to minikube Normal Pulled 3m4s kubelet, minikube Container image "gcr.io/google-samples/kubernetes-bootcamp:v1" already present on machine Normal Created 3m4s kubelet, minikube Created container Normal Started 3m4s kubelet, minikube Started container
kubectl logs $POD_NAME在container中直接執行命令
比如:獲取pod名字是kubernetes-bootcamp-6bf84cb898-jk4jc的日期,默認使用第一個container container by default
kubectl exec kubernetes-bootcamp-6bf84cb898-jk4jc date
再入:進入container的命令行環境
kubectl exec kubernetes-bootcamp-6bf84cb898-jk4jc bash
退出使用
exit暴露你的應用service 列出當前集群中的service
kubectl get services創建一個新的service并暴露給外部流量
kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 8080查看service詳情
$ kubectl describe services/kubernetes-bootcamp
結果:
Name: kubernetes-bootcamp Namespace: default Labels: run=kubernetes-bootcamp Annotations:創建一個環境變量NODE_PORT,它的值等于service暴露的端口Selector: run=kubernetes-bootcamp Type: NodePort IP: 10.105.231.53 Port: 8080/TCP TargetPort: 8080/TCP NodePort: 32400/TCP Endpoints: 172.18.0.4:8080 Session Affinity: None External Traffic Policy: Cluster Events:
export NODE_PORT=$(kubectl get services/kubernetes-bootcamp -o go-template="{{(index .spec.ports 0).nodePort}}") echo NODE_PORT=$NODE_PORT
測試:
curl $(minikube ip):$NODE_PORT使用labels 查看label
kubectl describe deployment
你能看到這樣一行:
Labels: run=kubernetes-bootcamp通過label查詢pod
kubectl get pods -l run=kubernetes-bootcamp通過label查詢service
kubectl get services -l run=kubernetes-bootcamp獲取pod名字,并保存到環境變量POD_NAME中
export POD_NAME=$(kubectl get pods -o go-template --template "{{range .items}}{{.metadata.name}}{{" "}}{{end}}") echo name of the pod: $POD_NAME添加新的lebel
使用label命令
kubectl label pod $POD_NAME app=v1
查看:
kubectl describe pods $POD_NAME刪除service 通過label刪除service
kubectl delete service -l run=kubernetes-bootcamp
確認刪除:
kubectl get services
確認沒有暴露給集群外部:
curl $(minikube ip):$NODE_PORT
確認集群內部還可以訪問:
kubectl exec -ti $POD_NAME curl localhost:8080
擴容 設置deployments的replica數量為4kubectl scale deployments/kubernetes-bootcamp --replicas=4
查看結果:
可以看到修改replica設置生效
NAME READY UP-TO-DATE AVAILABLE AGE kubernetes-bootcamp 4/4 4 4 3m17s
pod數量已經改變,查看詳情
kubectl get pods -o wide
結果:
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES kubernetes-bootcamp-6bf84cb898-7tbrg 1/1 Running 0 2m50s 172.18.0.5 minikubekubernetes-bootcamp-6bf84cb898-fx68f 1/1 Running 0 3m52s 172.18.0.4 minikube kubernetes-bootcamp-6bf84cb898-prgsc 1/1 Running 0 2m50s 172.18.0.6 minikube kubernetes-bootcamp-6bf84cb898-qv4gc 1/1 Running 0 2m50s 172.18.0.7 minikube
查看4個pod
kubectl describe deployments/kubernetes-bootcamp
結果:
Replicas: 4 desired | 4 updated | 4 total | 4 available | 0 unavailable查看service是否是負載均衡的 查看具體IP
kubectl describe services/kubernetes-bootcamp
結果:
Endpoints: 172.18.0.2:8080,172.18.0.4:8080,172.18.0.6:8080 + 1 more...創建環境變量NODE_PORT
export NODE_PORT=$(kubectl get services/kubernetes-bootcamp -o go-template="{{(index .spec.ports 0).nodePort}}") echo NODE_PORT=$NODE_PORT調用請求
可以看到,每次請求的都是不同的pod
curl $(minikube ip):$NODE_PORT
結果:
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-2l975 | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-zbmj4 | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-qg5xh | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-zbmj4 | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-bn98t | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-zbmj4 | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-zbmj4 | v=1 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-6bf84cb898-zbmj4 | v=1縮容
kubectl scale deployments/kubernetes-bootcamp --replicas=2 ## 更新到版本2 kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2
驗證更新
查看暴露出來的ip和端口
kubectl describe services/kubernetes-bootcamp
結果:
Name: kubernetes-bootcamp Namespace: default Labels: run=kubernetes-bootcamp Annotations:Selector: run=kubernetes-bootcamp Type: NodePort IP: 10.98.28.235 Port: 8080/TCP TargetPort: 8080/TCP NodePort: 31419/TCP Endpoints: 172.18.0.10:8080,172.18.0.11:8080,172.18.0.8:8080 + 1 more... Session Affinity: None External Traffic Policy: Cluster Events:
創建環境變量
export NODE_PORT=$(kubectl get services/kubernetes-bootcamp -o go-template="{{(index .spec.ports 0).nodePort}}") echo NODE_PORT=$NODE_PORT
訪問:
curl $(minikube ip):$NODE_PORT
結果:
訪問版本2,且每次訪問不同的地址
Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-5bf4d5689b-tcxpf | v=2 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-5bf4d5689b-tcxpf | v=2 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-5bf4d5689b-86c8g | v=2 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-5bf4d5689b-fx9tf | v=2 $ curl $(minikube ip):$NODE_PORT Hello Kubernetes bootcamp! | Running on: kubernetes-bootcamp-5bf4d5689b-tcxpf | v=2確認更新
kubectl rollout status deployments/kubernetes-bootcamp回滾
更新到版本10
kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=gcr.io/google-samples/kubernetes-bootcamp:v10
查看發現報錯,因為版本庫中沒有版本10
kubectl get deployments kubectl get pods kubectl describe pods
報錯
Warning Failed 38s (x3 over 77s) kubelet, minikube Failed to pull image "gcr.io/google-samples/kubernetes-bootcamp:v10": rpc error: code = Unknown desc = Error response from daemon: manifest for gcr.io/google-samples/kubernetes-bootcamp:v10 not found
執行會滾
kubectl rollout undo deployments/kubernetes-bootcamp
文章版權歸作者所有,未經允許請勿轉載,若此文章存在違規行為,您可以聯系管理員刪除。
轉載請注明本文地址:http://specialneedsforspecialkids.com/yun/33009.html
摘要:查看版本查看節點部署說明提供名稱和鏡像地址鏡像地址再如查看測試獲取名字測試使用進行故障排除主要使用如下命令列出資源顯示資源詳情打印中的日志在中的上執行命令獲取應用配置查看應用是否在運行查看中有哪些結 查看版本 kubectl version 查看節點 kubectl get nodes 部署app 說明: 提供deployment名稱和app鏡像地址(docker鏡像地址) kub...
摘要:平臺上的微服務架構應用再來看一下我眼中的基于當前最流行的微服務架構的設計是什么樣的,即我們平臺上要運行的典型應用是什么樣的。 showImg(https://segmentfault.com/img/remote/1460000010900878); 8月19日的數人云Container Meetup上,張龍老師做了《基于Kubernetes的PaaS平臺的設計和思考》的精彩分享,分別...
摘要:標識是與操作對象間的紐帶。集群為每個對象維護三類信息對象元數據期望狀態與實際狀態元數據指對象的基本信息,比如命名標簽注釋等等,用于識別對象期望狀態一般由用戶配置來描述的實際狀態是由集群各個組件上報的集群實際的運行情況。 綜述 學習Kubernetes時,發現它的概念和術語還是比較多的,光靠啃官方文檔比較晦澀。所以邊學習邊整理,對主要的概念和術語做一下分類及簡要說明。感覺把重要概念都理解...
摘要:核心概念是最小的調度單元,可以由一個或者多個容器組成。該模式會跟云服務商有關,比如可以通過等創建一個外部的負載均衡器,將請求轉發到對應的服務組。而可以提供外部服務可訪問的負載均衡器等。 概述 Kubernetes 有各類資源對象來描述整個集群的運行狀態。這些對象都需要通過調用 kubernetes api 來進行創建、修改、刪除,可以通過 kubectl 命令工具,也可以直接調用 k8...
摘要:知識點核心組件保存整個集群的狀態信息,感覺相當于的數據庫提供對資源操作的唯一入口,并提供認證授權,訪問控制,注冊與發現等機制負責維護集群的狀態,故障檢測,自動擴展,滾動更新等負責對資源的調度,按著預定的調度策略將調度到相應的集群上負責維護容 kubernetes kubernetes 知識點 1. 核心組件 etcd 保存整個集群的狀態信息,感覺相當于k8s的數據庫 apiserve...
閱讀 3581·2023-04-26 02:55
閱讀 2849·2021-11-02 14:38
閱讀 4135·2021-10-21 09:39
閱讀 2842·2021-09-27 13:36
閱讀 3943·2021-09-22 15:08
閱讀 2644·2021-09-08 10:42
閱讀 2802·2019-08-29 12:21
閱讀 667·2019-08-29 11:22