Exercise 3.3: Finish Cluster Setup - Problem with coreDNS

Hello,

There are a few reasons the pods are not fully running. It depends on how far along in the labs you may be as there are some other steps to run in order that you have two nodes and both are willing to run all pods.

When you ran kubeadm init --kubernetes-version 1.12.1 --pod-network-cidr 192.168.0.0/16 did you have any errors?
Did you find any errors when you did the kubeadm join from the worker node?
Were you able to remove the taints on both nodes?

Regards,

I have a similar problem. coreDNS is not starting up.
I am running the two nodes on bare metal. I am still in LAB 2.1 but everything installed and set up without error.

kubectl get pods --all-namespaces
NAMESPACE     NAME                                       READY   STATUS             RESTARTS   AGE
default       firstpod-7d88d7b6cf-bj8js                  1/1     Running            0          10m
kube-system   calico-etcd-wr2cf                          1/1     Running            3          13h
kube-system   calico-kube-controllers-57c8947c94-g2lbc   1/1     Running            3          13h
kube-system   calico-node-lsjm9                          2/2     Running            17         13h
kube-system   calico-node-zhgnd                          2/2     Running            9          13h
kube-system   coredns-576cbf47c7-56thg                   0/1     CrashLoopBackOff   53         13h
kube-system   coredns-576cbf47c7-nmznf                   0/1     CrashLoopBackOff   53         13h
kube-system   etcd-nuc1                                  1/1     Running            4          13h
kube-system   kube-apiserver-nuc1                        1/1     Running            4          13h
kube-system   kube-controller-manager-nuc1               1/1     Running            3          13h
kube-system   kube-proxy-ct89j                           1/1     Running            3          13h
kube-system   kube-proxy-lbdxr                           1/1     Running            5          13h
kube-system   kube-scheduler-nuc1                        1/1     Running            3          13h

When I describe the coreDNS pod I have the followin in the logs:

      Warning  FailedMount      83m                     kubelet, nuc1      MountVolume.SetUp failed for volume "coredns-token-zwdp6" : couldn't propagate object cache: timed out waiting for the condition
      Normal   SandboxChanged   83m (x2 over 83m)       kubelet, nuc1      Pod sandbox changed, it will be killed and re-created.
      Normal   Pulled           81m (x4 over 83m)       kubelet, nuc1      Container image "k8s.gcr.io/coredns:1.2.2" already present on machine
      Normal   Created          81m (x4 over 83m)       kubelet, nuc1      Created container
      Normal   Started          81m (x4 over 83m)       kubelet, nuc1      Started container
      Warning  BackOff          48m (x166 over 83m)     kubelet, nuc1      Back-off restarting failed container
      Normal   SandboxChanged   40m (x2 over 41m)       kubelet, nuc1      Pod sandbox changed, it will be killed and re-created.
      Normal   Pulled           39m (x4 over 40m)       kubelet, nuc1      Container image "k8s.gcr.io/coredns:1.2.2" already present on machine
      Normal   Created          39m (x4 over 40m)       kubelet, nuc1      Created container
      Normal   Started          39m (x4 over 40m)       kubelet, nuc1      Started container
      Warning  BackOff          59s (x194 over 40m)     kubelet, nuc1      Back-off restarting failed container