Kubectl:如何在不显式指定Pod名称的情况下显示Pod日志?

时间:2019-07-23 09:57:57

标签: bash kubernetes kubectl cmder

我的Pod在其名称后附加了一个动态生成的ID,例如my-app-name-7b587cd75b-dscsr,该ID在每次部署中都不同(下次可能是my-app-name-xcgv83bfsd-4kjsf)。

这使使用某些命令非常麻烦,因为每次需要查看日志时,我都必须先列出所有Pod,然后将更改后的名称复制粘贴到logs命令中:kubectl -n [namespace] logs my-app-name-7b587cd75b-dscsr。 / p>

有没有一种方法可以跳过吊舱名称或名称的一部分,并像kubectl -n [namespace] logs my-pod-name-~命令那样执行kubectl -n [namespace] logs service/my-pod-nameport-forward之类的事情?

我试图将grep插入logs命令中以获取吊舱名称,并在单个命令中运行logs,但是Windows上的Cmder确实如此,似乎支持$()kubectl -n [namespace] logs $(kubectl -n my-app-name get pod | grep my-app-name | sed 's/ .*//')

2 个答案:

答案 0 :(得分:2)

为部署添加标签,并使用标签选择器从匹配的pod中查找日志。

请参阅以下说明

master $ kubectl run webapp --image=nginx --port=80 --labels="app=web"
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/webapp created
master $

master $ kubectl get deploy
NAME     READY   UP-TO-DATE   AVAILABLE   AGE
webapp   1/1     1            1           2m27s
master $

master $ kubectl get po -owide
NAME                      READY   STATUS    RESTARTS   AGE   IP          NODE     NOMINATED NODE   READINESS GATES
webapp-647c6cd6f4-pxr4g   1/1     Running   0          20s   10.44.0.1   node01   <none>           <none>
master $

master $ curl 10.44.0.1
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
master $


master $ kubectl logs -l app=web
10.32.0.1 - - [23/Jul/2019:10:07:39 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"

答案 1 :(得分:1)

您可以使用 deployment / $ DEPLOYMENT_NAME 来获取Pod的日志,而不是使用 POD / $ POD_NAME

kubectl logs deployment/$DEPLOY_NAME


  # Return snapshot logs from container nginx-1 of a deployment named nginx
  kubectl logs deployment/nginx -c nginx-1

kubectl logs --help将提供更多信息