Nginx Kubernetes POD stays in ContainerCreating

Question

I was able to setup the Kubernetes Cluster on Centos7 with one master and two worker nodes, however when I try to deploy a pod with nginx, the state of the pod stays in ContainerRunning forever and doesn't seem to get out of it.

For pod network I am using the calico. Can you please help me resolve this issue? for some reason I don't feel satisfied moving forward without resolving this issue, I tried to check forums etc, since the last two days and this is the last resort that I am reaching out to you.

[root@kube-master ~]# kubectl get pods --all-namespaces
[get pods result][1]

However when I run describe pods I see the below error for the nginx container under events section.

Warning  FailedCreatePodSandBox  41s (x8 over 11m)     kubelet,
kube-worker1  (combined from similar events): Failed to create pod
sandbox: rpc error: code = Unknown desc = failed to set up sandbox
container
"ac77a42270009cba0c508e2fd82a84d6caef287bdb117d288d5193960b52abcb"
network for pod "nginx-6db489d4b7-2r4d2": networkPlugin cni failed to
set up pod "nginx-6db489d4b7-2r4d2_default" network: unable to connect
to Cilium daemon: failed to create cilium agent client after 30.000000
seconds timeout: Get http:///var/run/cilium/cilium.sock/v1/config:
dial unix /var/run/cilium/cilium.sock: connect: no such file or
directory

Hope you can help here.

Edit 1:

The ip address of the master VM is 192.168.40.133

Used the below command to initialize the kubeadm: kubeadm init --pod-network-cidr=192.168.0.0/16 --apiserver-advertise-address 192.168.40.133

Used the below command to install the pod network: kubectl apply -f https://docs.projectcalico.org/v3.11/manifests/calico.yaml

The kubeadm init above gave me the join command that I used to join the workers into the cluster.

All the VMs are connected to host and bridged network adapters.

Answer 1

your pod subnet (specified by --pod-network-cidr ) clashes with the network your VMs are located in: these 2 have to be distinct. Use something else for the pod subnet, for example 10.244.0.0/16 and then edit calico.yaml before applying it as described in the official docs :

POD_CIDR="10.244.0.0/16"
kubeadm init --pod-network-cidr=${POD_CIDR} --apiserver-advertise-address 192.168.40.133
curl https://docs.projectcalico.org/manifests/calico.yaml -O
sed -i -e "s?192.168.0.0/16?${POD_CIDR}?g" calico.yaml
kubectl apply -f calico.yaml

hope this helps :)

note: you don't really need to specify --apiserver-advertise-address flag: kubeadm will detect correctly the main IP of the machine most of the time.