Calico-kube-controllers and coredns are in Pending status and not coming to Running State

Question

NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE   IP               NODE      NOMINATED NODE   READINESS GATES
kube-system   calico-kube-controllers-694687c474-6lqzq   0/1     Pending   0          24m   <none>           <none>    <none>           <none>
kube-system   coredns-86c58d9df4-9ffb8                   0/1     Pending   0          35m   <none>           <none>    <none>           <none>
kube-system   coredns-86c58d9df4-h7v4l                   0/1     Pending   0          30m   <none>           <none>    <none>           <none>
kube-system   etcd-kmaster                               1/1     Running   0          34m   10.223.126.202   kmaster   <none>           <none>
kube-system   kube-apiserver-kmaster                     1/1     Running   0          34m   10.223.126.202   kmaster   <none>           <none>
kube-system   kube-controller-manager-kmaster            1/1     Running   0          35m   10.223.126.202   kmaster   <none>           <none>
kube-system   kube-proxy-qmxdz                           1/1     Running   0          35m   10.223.126.202   kmaster   <none>           <none>
kube-system   kube-scheduler-kmaster                     1/1     Running   0          35m   10.223.126.202   kmaster   <none>           <none>

I have followed the same steps as provided in

https://www.edureka.co/blog/install-kubernetes-on-ubuntu

Also have executed the below command.

kubectl apply -f https://docs.projectcalico.org/v3.0/getting-started/kubernetes/installation/hosted/kubeadm/1.7/calico.yaml

But still see them in Pending Status.

Comments

Hey @Ravikiran, Check if you've given enough resources. Also describe those pending pods and show me the output. 

Use the following command for describing the pods:

 kubectl describe pod <pod-name>

Answer 1

ravikiran

Plz try version 3.1

kubectl apply -f https://docs.projectcalico.org/v3.1/getting-started/kubernetes/installation/hosted/kubeadm/1.7/calico.yaml

Comments

Why doesn't it work with 3.0 version?

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You can also use other network plugins like flannel or weave.

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Thanks SIr, Worked for me

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worked for me also! :) Thank you!

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thank man, work for me

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Please upvote the answer, if it helped you. Thanks!

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Thanks, It's also worked for me !!!!!!!!!!!!

Answer 2

Hi Could you please indicate the commnads required to check if given resources are enough?

Also when running  kubectl describe pod <pod-name>

How to get the pod-name  list?   Using any name in the list resulting of :

$ kubectl get pods -o wide --all-namespaces
kube-system   calico-kube-controllers-694687c474-sp282   0/1     Pending   0
kube-system   coredns-86c58d9df4-28tgk                   0/1     Pending   0
kube-system   coredns-86c58d9df4-6vmxp                   0/1     Pending   0
kube-system   etcd-kmaster                               1/1     Running   3

For example

$ kubectl describe pod calico-kube-controllers
Error from server (NotFound): pods "calico-kube-controllers" not found

Any help will be apreciated as I'm new on Kubernetes.
Cheers

Comments

Get the logs using the following command

kubectl logs podname --namespace=kube-system

Also, check the events using the following command

kubectl get events --namespace=kube-system

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You're getting this error because the pod does not exist as of now, it has not been created, still in pending state.

Error from server (NotFound): pods "calico-kube-controllers" not found

Answer 3

root@kmaster:/home/master# kubectl get pods -o wide --all-namespaces
NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE    IP          NODE      NOMINATED NODE   READINESS GATES
kube-system   calico-kube-controllers-75f6766678-jxbrq   0/1     Pending   0          7m5s   <none>      <none>    <none>           <none>
kube-system   coredns-fb8b8dccf-5bsp2                    0/1     Pending   0          11m    <none>      <none>    <none>           <none>
kube-system   coredns-fb8b8dccf-6j6w4                    0/1     Pending   0          11m    <none>      <none>    <none>           <none>
kube-system   etcd-kmaster                               1/1     Running   0          10m    10.0.2.15   kmaster   <none>           <none>
kube-system   kube-apiserver-kmaster                     1/1     Running   0          10m    10.0.2.15   kmaster   <none>           <none>
kube-system   kube-controller-manager-kmaster            1/1     Running   0          10m    10.0.2.15   kmaster   <none>           <none>
kube-system   kube-proxy-xt792                           1/1     Running   0          11m    10.0.2.15   kmaster   <none>           <none>
kube-system   kube-scheduler-kmaster                     1/1     Running   0          10m    10.0.2.15   kmaster   <none>           <none>

 I have followed the same steps as provided in 

https://www.edureka.co/blog/install-kubernetes-on-ubuntu 

Also have executed the below command. 

kubectl apply -f https://docs.projectcalico.org/v3.0/getting-started/kubernetes/installation/hosted/kubeadm/1.7/calico.yaml 

But still see them in Pending Status.

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root@kmaster:/home/master#  kubectl describe pod calico-kube-controllers-75f6766678-jxbrq
Error from server (NotFound): pods "calico-kube-controllers-75f6766678-jxbrq" not found

 

Comments

Hey, did you try using Flannel as your CNI?

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and my kuberneties version please help me to fix this

root@k8s:/home/osboxes# kubectl get nodes
NAME   STATUS     ROLES                  AGE    VERSION
k8s    NotReady   control-plane,master   149m   v1.20.5
k8s1   NotReady   <none>                 43m    v1.20.5
k8s2   NotReady   <none>                 42m    v1.20.5

root@k8s:/home/osboxes# kubectl get pods -o wide --all-namespaces
NAMESPACE         NAME                               READY   STATUS    RESTARTS   AGE    IP               NODE     NOMINATED NODE   READINESS GATES
kube-system       calicoctl                          0/1     Pending   0          116m   <none>           <none>   <none>           <none>
kube-system       coredns-74ff55c5b-59nk5            0/1     Pending   0          149m   <none>           <none>   <none>           <none>
kube-system       coredns-74ff55c5b-m4nsm            0/1     Pending   0          149m   <none>           <none>   <none>           <none>
kube-system       etcd-k8s                           1/1     Running   2          149m   192.168.56.101   k8s      <none>           <none>
kube-system       kube-apiserver-k8s                 1/1     Running   3          149m   192.168.56.101   k8s      <none>           <none>
kube-system       kube-controller-manager-k8s        1/1     Running   2          149m   192.168.56.101   k8s      <none>           <none>
kube-system       kube-proxy-6tx6b                   1/1     Running   2          149m   192.168.56.101   k8s      <none>           <none>
kube-system       kube-proxy-7hhfw                   1/1     Running   1          43m    192.168.56.104   k8s2     <none>           <none>
kube-system       kube-proxy-tm996                   1/1     Running   1          43m    192.168.56.103   k8s1     <none>           <none>
kube-system       kube-scheduler-k8s                 1/1     Running   2          149m   192.168.56.101   k8s      <none>           <none>
tigera-operator   tigera-operator-675ccbb69c-2wkg4   1/1     Running   3          124m   192.168.56.101   k8s      <none>           <none>

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To get description you need to provide namespace as well. Use the following command:

kubectl describe pod calico-kube-controllers-75f6766678-jxbrq -n kube-system

Also, check the pod name. Better copy paste the pod name.