k8s之Weave Scope監控

原創

2019-10-18 14:29

用 Weave Scope 監控集羣

創建 Kubernetes 集羣並部署容器化應用只是第一步。一旦集羣運行起來，我們需要確保一起正常，所有必要組件就位並各司其職，有足夠的資源滿足應用的需求。Kubernetes 是一個複雜系統，運維團隊需要有一套工具幫助他們獲知集羣的實時狀態，併爲故障排查提供及時和準確的數據支持。

Kubernetes 常用的監控方案

Weave Scope

Weave Scope 是 Docker 和 Kubernetes 可視化監控工具。Scope 提供了至上而下的集羣基礎設施和應用的完整視圖，用戶可以輕鬆對分佈式的容器化應用進行實時監控和問題診斷。

安裝 Scope

安裝 Scope 的方法很簡單，執行如下命令：

kubectl apply -f "https://cloud.weave.works/k8s/scope.yaml?k8s-version=$(kubectl version | base64 | tr -d '\n')&k8s-service-type=NodePort"
部署成功後，有如下相關組件：

[root@k8s-master ~]# kubectl apply -f "https://cloud.weave.works/k8s/scope.yaml?k8s-version=$(kubectl version | base64 | tr -d '\n')&k8s-service-type=NodePort"
namespace/weave unchanged
serviceaccount/weave-scope created
clusterrole.rbac.authorization.k8s.io/weave-scope configured
clusterrolebinding.rbac.authorization.k8s.io/weave-scope configured
deployment.apps/weave-scope-app created
service/weave-scope-app created
deployment.apps/weave-scope-cluster-agent created
daemonset.apps/weave-scope-agent created
[root@k8s-master ~]# kubectl get pod -n weave
NAME                                         READY   STATUS              RESTARTS   AGE
weave-scope-agent-bct26                      1/1     Running             0          30s
weave-scope-agent-vzdbr                      0/1     ContainerCreating   0          30s
weave-scope-agent-xvwsp                      0/1     ContainerCreating   0          30s
weave-scope-app-cf544d8c4-v9x5z              1/1     Running             0          30s
weave-scope-cluster-agent-6466d94ccf-r4vql   0/1     ContainerCreating   0          30s
[root@k8s-master ~]# kubectl get pod -n weave
NAME                                         READY   STATUS    RESTARTS   AGE
weave-scope-agent-bct26                      1/1     Running   0          57s
weave-scope-agent-vzdbr                      1/1     Running   0          57s
weave-scope-agent-xvwsp                      1/1     Running   0          57s
weave-scope-app-cf544d8c4-v9x5z              1/1     Running   0          57s
weave-scope-cluster-agent-6466d94ccf-r4vql   1/1     Running   0          57s
[root@k8s-master ~]# kubectl get svc -n weave 
NAME              TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
weave-scope-app   NodePort   10.108.59.226   <none>        80:31013/TCP   68s
[root@k8s-master ~]# kubectl get deployments. -n weave 
NAME                        READY   UP-TO-DATE   AVAILABLE   AGE
weave-scope-app             1/1     1            1           81s
weave-scope-cluster-agent   1/1     1            1           80s

DaemonSet weave-scope-agent，集羣每個節點上都會運行的 scope agent 程序，負責收集數據。

Deployment weave-scope-app，scope 應用，從 agent 獲取數據，通過 Web UI 展示並與用戶交互。

Service weave-scope-app，默認是 ClusterIP 類型，已經在上面的命令中添加了參數k8s-service-type=NodePort修改爲 NodePort。