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# general
a
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r
I've seen it sporadically, but not predictably on 20.04 too. It seems like there's some chance of it hitting any system that runs its own DNS resolver so has 127.0.0.x in /etc/resolv.conf We fixed by editing coredns ConfigMap to include the DNS IP it should be pointed to, then things were fine.
p
hmm, think im getting closer, in my case it looks to be related to flannel etc not properly injecting the ip table routes
r
That's certainly a worse problem than mine. I can certainly see how coredns would be one of the early canaries for that one, though. I don't recall, but does flannel have pods to poke & check the logs?
And is it missing from the local routing table on all your nodes, or just some?
p
yea the flannel pod pokes at the iptables pretty consistantly, but i dont see any of the entries in its logs its trying to add getting through to the actual iptables routes
for me this is only happening on ubuntu 22.04 nodes, older 20.04 are fine
r
I don't know if iptables is involved with the routing, I thought that showed up with the
route
command instead.
I assume ufw is off just to cover bases?
p
sorry ip route, your right
r
Not sure what may have changed with networking and/or network permissions, we ran into some other problems with 22.04 before we even got to Kubernetes and backed off to 20.04 to eliminate the possibility (and our production environment is RHEL clones, so Ubuntu was more just for dev systems and ok to ignore).
p
this may have fixed it, still tshooting
Copy code
update-alternatives --set iptables /usr/sbin/iptables-legacy
from: https://github.com/k3s-io/k3s/issues/4188 which our very own @creamy-pencil-82913 helped with hah
yup, adding iptables legacy and a reboot, now everything works 100% fine on ubuntu 22.04 (btw this was an in-place upgrade aka do-release-upgrade)
r
Nice to hear, I'll keep it in mind if I hear similar.
🙌 1
g
I am facing same problem and tried the solutions provided here but not working. Do we have any other solution.
e
I am facing same issue with coredns pods and tried the solutions provided but did not work for me. Do we have any other solutions.
I am facing same issue with coredns pods and tried the solutions provided but did not work for me. Do we have any other solutions.
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