"Calico CNI - calico-kube-controllers Failed to initialize Calico data store" error

Question

I am running Calico CNI v3.19.1 on Kubernetes version v1.19.13. using CentOS Steam 8 and RHEL 8 OS for this cluster with 3 master and 3 nodes.

when calico-kube-controller starts on the worker node. Its failing with [FATAL][1] main.go 118: Failed to initialize Calico data store error message.

I used below setting while deploying calico

    # Auto-detect the BGP IP address.
    - name: IP
      value: "autodetect"
    - name: IP_AUTODETECTION_METHOD
      value: "interface=en.*"
    - name: FELIX_IPTABLESBACKEND
      value: "NFT"

Error message during pod startup:

 klf calico-kube-controllers-5978c5f6b5-bxbmw
2021-07-26 15:24:21.353 [INFO][1] main.go 92: Loaded configuration from environment config=&config.Config{LogLevel:"info", WorkloadEndpointWorkers:1, ProfileWorkers:1, PolicyWorkers:1, NodeWorkers:1, Kubeconfig:"", DatastoreType:"kubernetes"}
W0726 15:24:21.356093       1 client_config.go:615] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
2021-07-26 15:24:21.357 [INFO][1] main.go 113: Ensuring Calico datastore is initialized
2021-07-26 15:24:31.357 [ERROR][1] client.go 261: Error getting cluster information config ClusterInformation="default" error=Get "https://10.96.0.1:443/apis/crd.projectcalico.org/v1/clusterinformations/default": context deadline exceeded
2021-07-26 15:24:31.357 [FATAL][1] main.go 118: Failed to initialize Calico datastore error=Get "https://10.96.0.1:443/apis/crd.projectcalico.org/v1/clusterinformations/default": context deadline exceeded

Any tips to resolve this error message?

Thanks SR

Answer 1

Try this on you master node, this is work for me.

  $ sudo iptables -P INPUT ACCEPT
  $ sudo iptables -P FORWARD ACCEPT
  $ sudo iptables -P FORWARD ACCEPT
  $ sudo iptables -F