My Dashboard is not coming up. When I got the url I see this in the nginx logs and on the browser I get 502 Bad Gateway nginx/1.13.8
kubectl logs --follow -n kube-system deployment/nginx-ingress
2018/08/27 21:14:40 [error] 51#51: *4 connect() failed (113: No route to host) while connecting to upstream, client: 10.125.16.80, server: osmsku---kubemaster01, request: "GET /kube-ui/ HTTP/1.1", upstream: "http://172.17.77.5:9090/", host: "osmsku---kubemaster01"
10.125.16.80 - - [27/Aug/2018:21:14:40 +0000] "GET /kube-ui/ HTTP/1.1" 502 575 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36" "-"and on the dashboard logs I see this
2018/08/27 21:13:35 Creating in-cluster Heapster client
2018/08/27 21:13:35 Serving insecurely on HTTP port: 9090
2018/08/27 21:13:38 Metric client health check failed: the server is currently unable to handle the request (get services heapster). Retrying in 30 seconds.
2018/08/27 21:14:11 Metric client health check failed: the server is currently unable to handle the request (get services heapster). Retrying in 30 seconds.
2018/08/27 21:14:44 Metric client health check failed: the server is currently unable to handle the request (get services heapster). Retrying in 30 seconds.
2018/08/27 21:15:17 Metric client health check failed: the server is currently unable to handle the request (get services heapster). Retrying in 30 seconds.I tried deleting all the pods in the kube-system namespace. Deleted the dashboard/ heapster but nothing helped. Any ideas what is going on. or what to check. Note, I have upgraded the cluster and everything came up fine after that. I rebooted the master node after upgrade and this is what happened
NAME STATUS ROLES AGE VERSION
osmsku---kubemaster01..local Ready master 140d v1.11.2
osmsku---kubemaster02..local Ready <none> 140d v1.11.2
osmsku---kubenode01..local Ready <none> 140d v1.11.2
osmsku---kubenode02..local Ready <none> 140d v1.11.2Updated as per below comments: 77.5 is the docker interface ip
kubectl -n kube-system get -o wide svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
elasticsearch-logging ClusterIP 10.110.162.147 <none> 9200/TCP 4h k8s-app=elasticsearch-logging
heapster ClusterIP 10.98.52.12 <none> 80/TCP 1h k8s-app=heapster
kibana-logging NodePort 10.99.101.8 <none> 5601:30275/TCP 4h k8s-app=kibana-logging
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP 3h k8s-app=kube-dns
kubernetes-dashboard NodePort 10.99.131.186 <none> 80:32264/TCP 2h k8s-app=kubernetes-dashboard
monitoring-influxdb ClusterIP 10.101.205.79 <none> 8086/TCP 1h k8s-app=influxdb
kubectl get -o wide node
NAME STATUS ROLES AGE VERSION EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
osmsku--prod-kubemaster01..local Ready master 140d v1.11.2 <none> CentOS Linux 7 (Core) 3.10.0-514.26.2.el7.x86_64 docker://18.3.0
osmsku--prod-kubemaster02..local Ready <none> 140d v1.11.2 <none> CentOS Linux 7 (Core) 3.10.0-514.26.2.el7.x86_64 docker://18.3.0
osmsku--prod-kubenode01..local Ready <none> 140d v1.11.2 <none> CentOS Linux 7 (Core) 3.10.0-514.26.2.el7.x86_64 docker://18.3.0
osmsku--prod-kubenode02..local Ready <none> 140d v1.11.2 <none> CentOS Linux 7 (Core) 3.10.0-514.26.2.el7.x86_64 docker://18.3.0
k get pods -n=kube-system
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-qngz5 1/1 Running 2 2h
coredns-78fcdf6894-xdjcg 1/1 Running 1 2h
elasticsearch-logging-0 1/1 Running 2 2h
etcd-osmsku--prod-kubemaster01..local 1/1 Running 15 2h
fluentd-es-v2.0.3-g77rm 1/1 Running 2 2h
fluentd-es-v2.0.3-x5bds 1/1 Running 3 2h
heapster-6d956577dc-d6l6k 1/1 Running 0 1h
kibana-logging-66fcf97dc8-57nd5 1/1 Running 1 2h
kube-apiserver-osmsku--prod-kubemaster01..local 1/1 Running 2 2h
kube-controller-manager-osmsku--prod-kubemaster01..local 1/1 Running 2 2h
kube-flannel-ds-4wdb7 1/1 Running 3 2h
kube-flannel-ds-5g26z 1/1 Running 2 2h
kube-flannel-ds-c9zss 1/1 Running 3 2h
kube-flannel-ds-jbsfm 1/1 Running 3 2h
kube-proxy-dzllb 1/1 Running 1 2h
kube-proxy-gv2lf 1/1 Running 2 2h
kube-proxy-gxd6b 1/1 Running 2 2h
kube-proxy-hfwrv 1/1 Running 2 2h
kube-scheduler-osmsku--prod-kubemaster01..local 1/1 Running 2 2h
kubernetes-dashboard-6bc9c6f7cb-f8g7s 1/1 Running 0 2h
monitoring-influxdb-cf9d95766-tkqhp 1/1 Running 0 1h
nginx-ingress-5659cc597-g9qg6 1/1 Running 0
2h