kube-proxy won't start in Minikube because of permission denied issue with /proc/sys/net/netfilter/nf_conntrack_max
After updating Arch Linux (sudo pacman -Syu) and restarting the system, Minikube fails to start because of kube-proxy. The logs show it was trying to modify /proc/sys/net/netfilter/nf_conntrack_max but it ran into a permission denied issue.
I tried to run sudo chmod 777 /proc/sys/net/netfilter/nf_conntrack_max but the system didn't allow me. I also removed ~/.minikube and started again, but it still refused to work. Same issue when starting kind. Can anyone tell me how to fix this?
$ kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-74ff55c5b-2hkpd 0/1 Running 0 22s
etcd-minikube 0/1 Running 0 30s
kube-apiserver-minikube 1/1 Running 0 30s
kube-controller-manager-minikube 0/1 Running 0 30s
kube-proxy-qhhx9 0/1 Error 2 22s
kube-scheduler-minikube 0/1 Running 0 30s
storage-provisioner 1/1 Running 0 35s
kubectl logs kube-proxy-qhhx9 -n kube-system
I0511 04:47:08.189373 1 node.go:172] Successfully retrieved node IP: 192.168.49.2
I0511 04:47:08.189422 1 server_others.go:142] kube-proxy node IP is an IPv4 address (192.168.49.2), assume IPv4 operation
W0511 04:47:08.207109 1 server_others.go:578] Unknown proxy mode "", assuming iptables proxy
I0511 04:47:08.207314 1 server_others.go:185] Using iptables Proxier.
I0511 04:47:08.208192 1 server.go:650] Version: v1.20.2
I0511 04:47:08.209006 1 conntrack.go:100] Set sysctl 'net/netfilter/nf_conntrack_max' to 131072
F0511 04:47:08.209060 1 server.go:495] open /proc/sys/net/netfilter/nf_conntrack_max: permission denied
Kernel version
$ uname -r
5.12.2-arch1-1
$ iptables --version
iptables v1.8.7 (legacy)
change maxPerCore to 0 in configMap of kube-proxy to leave the limit as-is and ignore conntrack-min
Getting the same issue although using kind. FWIW it helps downgrading the kernel to 5.11.