Change:
klog.V(5).InfoS("Restoring iptables", "rules", proxier.iptablesData.Bytes()) err = proxier.iptables.RestoreAll(proxier.iptablesData.Bytes(), utiliptables.NoFlushTables, utiliptables.RestoreCounters) if err != nil { <del> klog.ErrorS(err, "Failed to execute iptables-restore") </del> <ins> if pErr, ok := err.(utiliptables.ParseError); ok { lines := utiliptables.ExtractLines(proxier.iptablesData.Bytes(), pErr.Line(), 3) klog.ErrorS(pErr, "Failed to execute iptables-restore", "rules", lines) } else { klog.ErrorS(err, "Failed to execute iptables-restore") } </ins> metrics.IptablesRestoreFailuresTotal.Inc() // Revert new local ports. klog.V(2).InfoS("Closing local ports after iptables-restore failure")

Discussion:
my k8s cluster version is 1.17.x this cluster has 10 master only 2 nodes get problem. it make my svc sometime can usesometime can timeout what can i do can resolve this problem ? this 2 node's svc is nodeportType
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you can increase kube-proxy verbosity adding flag and you should get more information about the cause of the error Kubernetes 1.17 is EOL, so you should upgrade to 1.19 at least
/sig network
hello bromy cluster is use kubeadm init .so what should i do .i know this is use configmap but in this i can not found how edit this configmap is availableabout upgrade this cluster .this time is impossible
about stack. i only get this log.
To increase the verbosity on kube-proxy on a kubeadm deployment you can do and wait until pods are restarted. Despite that, if there is a bug, it will not be backported to 1.17, so you have to go to a supported version first
I swear we code to dump the ruleset when this happens, but I don't see it any more.
I'm going to re-purpose this as a feature :)
Hi, I would like to pick this up. Can someone give me some code pointers on where to start?
Let me know if I can help in anyway.
/assign
I'd start with - It's worth thinking about the cleanest solution here, but maybe something like: When you get an error from exec, parse the error for and if it matches, return a . Then let the callers check for a by interface assertion, extract the Line(), extract their input's data at -3 and +3 from that line and log it. E.g. You'll proably want a helper func to do that, which could live in that same iptables package. And a test.
/assign
hi everyone! Is anyone doing this?

I am willing to do this
at least I didn't see any PR from , in case of collision please sync between both to avoid duplicate efforts
hi did you work on it?
Hi apologies I was busy with some other work. You must please continue.
thanks
/assign
I'm working on this now, but I'm stuck in here, I got the line, and then how I extract at -3 and +3 from that line?
you may need to write a helper function to extract them from the logs. my 2 cents.. here is my version for reference. you could add some tests, to cover the boundary conditions. to play around :)