[K8S]Calico and CoreDNS pending status

System Enviornment

1. Calico Version: v3.25.0
2. Kubeadm Version: 1.25
3. Ubuntu 18.04.5 LTS
4. Containerd Version: 1.6.16
5. Docker Version: 23.0.0

Deploy K8S with CNI (Calico)

sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.200.11
kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/tigera-operator.yaml
wget https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/custom-resources.yaml

Modify custom-resources.yaml (Change CIDR to 10.244.0.0/16)

apiVersion: operator.tigera.io/v1
kind: Installation
metadata:
  name: default
spec:
  # Configures Calico networking.
  calicoNetwork:
    # Note: The ipPools section cannot be modified post-install.
    ipPools:
    - blockSize: 26
      cidr: 10.244.0.0/16
      encapsulation: VXLANCrossSubnet
      natOutgoing: Enabled
      nodeSelector: all()

---

# This section configures the Calico API server.
# For more information, see: https://projectcalico.docs.tigera.io/master/reference/installation/api#operator.tigera.io/v1.APIServer
apiVersion: operator.tigera.io/v1
kind: APIServer
metadata:
  name: default
spec: {}

I am struggling with the fact that the calico-kube-controllers and coredns pods are showing as pending status.

After I Googled this issue, I found that containerd could no longer listen to CNI events. Restarting containerd could fix this problem.

sudo systemctl restart containerd

It seems to have worked out!

Reference

安装之后一直coredns pending · Issue #834 · labring/sealos (github.com)