Retrieve Node Configuration for Clusters Created Using Hostname

Problem

Retrieve Node Configuration for Clusters Created Hostname.

Environment

• Platform9 Managed Kubernetes - v5.2 & K8s v1.20 and Higher

Answer

Single Node Cluster created with hostname:true.

None

$ kubectl get nodes
NAME                    STATUS   ROLES    AGE     VERSION
sanchit-mav.novalocal   Ready    master   5m37s   v1.20.5

Starting Kubectl Proxy on the node.

None

$ kubectl proxy --port=8001 &
[1] 12428

$ Starting to serve on 127.0.0.1:8001

With hostname of the node in curl call.

None

$ curl -sSL http://localhost:8001/api/v1/nodes/sanchit-mav.novalocal/proxy/configz -vvv
* About to connect() to localhost port 8001 (#0)
*   Trying ::1...
* Connection refused
*   Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 8001 (#0)
> GET /api/v1/nodes/sanchit-mav.novalocal/proxy/configz HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost:8001
> Accept: */*
>
< HTTP/1.1 200 OK
< Cache-Control: no-cache, private
< Content-Length: 2431
< Content-Type: application/json
< Date: Wed, 22 Sep 2021 23:34:51 GMT
< X-Content-Type-Options: nosniff
<
{"kubeletconfig":{"enableServer":true,"staticPodPath":"/etc/pf9/kube.d/master.yaml","syncFrequency":"1m0s","fileCheckFrequency":"20s","httpCheckFrequency":"20s","address":"0.0.0.0","port":10250,"tlsCertFile":"/etc/pf9/kube.d/certs/kubelet/server/request.crt","tlsPrivateKeyFile":"/etc/pf9/kube.d/certs/kubelet/server/request.key","tlsCipherSuites":["TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"],"authentication":{"x509":{"clientCAFile":"/etc/pf9/kube.d/certs/kubelet/server/ca.crt"},"webhook":{"enabled":true,"cacheTTL":"2m0s"},"anonymous":{"enabled":false}},"authorization":{"mode":"AlwaysAllow","webhook":{"cacheAuthorizedTTL":"5m0s","cacheUnauthorizedTTL":"30s"}},"registryPullQPS":5,"registryBurst":10,"eventRecordQPS":5,"eventBurst":10,"enableDebuggingHandlers":true,"healthzPort":10248,"healthzBindAddress":"127.0.0.1","oomScoreAdj":-999,"clusterDomain":"cluster.local","clusterDNS":["10.21.0.10"],"streamingConnectionIdleTimeout":"4h0m0s","nodeStatusUpdateFrequency":"10s","nodeStatusReportFrequency":"5m0s","nodeLeaseDurationSeconds":40,"imageMinimumGCAge":"2m0s","imageGCHighThresholdPercent":85,"imageGCLowThresholdPercent":80,"volumeStatsAggPeriod":"1m0s","cgroupsPerQOS":true,"cgroupDriver":"cgroupfs","cpuManagerPolicy":"none","cpuManagerReconcilePeriod":"10s","topologyManagerPolicy":"none","topologyManagerScope":"container","runtimeRequestTimeout":"2m0s","hairpinMode":"promiscuous-bridge","maxPods":200,"podPidsLimit":-1,"resolvConf":"/etc/resolv.conf","cpuCFSQuota":true,"cpuCFSQuotaPeriod":"100ms","nodeStatusMaxImages":50,"maxOpenFiles":1000000,"contentType":"application/vnd.kubernetes.protobuf","kubeAPIQPS":5,"kubeAPIBurst":10,"serializeImagePulls":true,"evictionHard":{"imagefs.available":"15%","memory.available":"100Mi","nodefs.available":"10%","nodefs.inodesFree":"5%"},"evictionPressureTransitionPeriod":"5m0s","enableControllerAttachDetach":true,"makeIPTablesUtilChains":true,"iptablesMasqueradeBit":14,"iptablesDropBit":15,"featureGates":{"D* Connection #0 to host localhost left intact
ynamicKubeletConfig":true},"failSwapOn":true,"containerLogMaxSize":"10Mi","containerLogMaxFiles":5,"configMapAndSecretChangeDetectionStrategy":"Watch","enforceNodeAllocatable":["pods"],"volumePluginDir":"/usr/libexec/kubernetes/kubelet-plugins/volume/exec/","logging":{"format":"text"},"enableSystemLogHandler":true,"shutdownGracePeriod":"0s","shutdownGracePeriodCriticalPods":"0s"}}