访问 nginx-ingress-controller 错误日志

Question

I have set up one Kubernetes master node and 2 workers node. I deployed two web applications as a pod using kubectl . I deployed nginx-ingress-controller ( image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.6 ) and created a service for the same with nodeport option. How do I access the error logs of the nginx-ingress-controller ? I'm able to see error.log under /var/log/nginx/ , but it is link to /dev/stderr .

Answer 1

TL;DR

kubectl logs -n <<ingress_namespace>> <<ingress_pod_name>>

Check the namespace under which the Ingress controller is currently running.

$ kubectl get pods
NAME                                    READY   STATUS    RESTARTS   AGE
helloworld-deployment-7dc448d6b-5zvr8   1/1     Running   1          3d20h
helloworld-deployment-7dc448d6b-82dnt   1/1     Running   1          3d20h

$ kubectl get pods -n kube-system
NAME                                        READY   STATUS    RESTARTS   AGE
kube-apiserver-minikube                     1/1     Running   1          3d20h
nginx-ingress-controller-586cdc477c-rhj9z   1/1     Running   1          3d21h

For me, it happens to be the kube-system namespace on the pod nginx-ingress-controller-586cdc477c-rhj9z .

Now, get the logs just like you would for any pod using

 kubectl logs -n kube-system nginx-ingress-controller-586cdc477c-rhj9z

Answer 2

In most cases, you will see that containerized applications spit out their logs to stdout/stderr, which means they are available as container logs. In Kubernetes you can access these logs by means of ie. kubectl logs <pod>

Update: a very nice tool for logs cli browsing - https://github.com/wercker/stern

Answer 3

I prefer: kubectl logs -lapp=nginx-ingress

(get the logs of all pods with the label nginx-ingress )