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

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