Hello,
first of all - i am new to this list. please be tolerant of minor
mistakes on my side.
I am running into a problem where DNS queries get a timeout. The
original post is https://github.com/rancher/rke2/issues/3924
After some tests and research we saw that a DNS answer packet (UDP) does
not reach the application. But tcpdump shows that the answer packet
comes into container right in time. Application sends another packet
after 5 sec. If the answer packet drops three times the application
reports an IO timeout.
Problem occurs more often some minutes after having high network load
inside the container.
netstat presents a counter "|packet receive errors". This counter
increments if a packet get lost.|
Udp:
1482 packets received
0 packets to unknown port received
217 packet receive errors
1699 packets sent
0 receive buffer errors
All measures are made in inside container. The application runs inside
this container too.
Host runs on:
Linux version 5.10.0-20-amd64 (debian-kernel@xxxxxxxxxxxxxxxx) (gcc-10
(Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian)
2.35.2) #1 SMP Debian 5.10.158-2 (2022-12-13)
containerd github.com/k3s-io/containerd v1.6.14-k3s1
6f9c63d571f5026e85a0768f0f2ef03d1c8dbc6e
Does anybody know how to fix the problem, how to do better diagnostic or
where to go with that?
Thank you in advance!
