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use different pod for querying kube system pods (#8816) 

* use different pod for querying kube system pods

* use kube-dns lable for querying pod
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Shamsher Ansari 2021-01-22 23:50:57 +05:30 committed by GitHub
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content/en/docs/ops/diagnostic-tools/istioctl-describe/index.md
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@ -44,15 +44,18 @@ proxy is not present in a pod or if the proxy has not started. Additionally, the
if some of the [Istio requirements for pods](/docs/ops/deployment/requirements/)
are not met.
For example, the following command produces a warning indicating a `kubernetes-dashboard`
For example, the following command produces a warning indicating a `kube-dns`
pod is not part of the service mesh because it has no sidecar:
{{< text bash >}}
$ export DASHBOARD_POD=$(kubectl -n kube-system get pod -l k8s-app=kubernetes-dashboard -o jsonpath='{.items[0].metadata.name}')
$ istioctl x describe pod -n kube-system $DASHBOARD_POD
WARNING: kubernetes-dashboard-7996b848f4-nbns2.kube-system is not part of mesh; no Istio sidecar
$ export KUBE_POD=$(kubectl -n kube-system get pod -l k8s-app=kube-dns -o jsonpath='{.items[0].metadata.name}')
$ istioctl x describe pod -n kube-system $KUBE_POD
Pod: coredns-f9fd979d6-2zsxk
Pod Ports: 53/UDP (coredns), 53 (coredns), 9153 (coredns)
WARNING: coredns-f9fd979d6-2zsxk is not part of mesh; no Istio sidecar
--------------------
Error: failed to execute command on sidecar: error execing into kubernetes-dashboard-7996b848f4-nbns2/kube-system istio-proxy container: container istio-proxy is not valid for pod kubernetes-dashboard-7996b848f4-nbns2
2021-01-22T16:10:14.080091Z error klog an error occurred forwarding 42785 -> 15000: error forwarding port 15000 to pod 692362a4fe313005439a873a1019a62f52ecd02c3de9a0957cd0af8f947866e5, uid : failed to execute portforward in network namespace "/var/run/netns/cni-3c000d0a-fb1c-d9df-8af8-1403e6803c22": failed to dial 15000: dial tcp4 127.0.0.1:15000: connect: connection refused[]
Error: failed to execute command on sidecar: failure running port forward process: Get "http://localhost:42785/config_dump": EOF
{{< /text >}}
The command will not produce such a warning for a pod that is part of the mesh,