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bugtool: Collect XFRM error counters twice #28790
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dylandreimerink
merged 1 commit into
cilium:main
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pchaigno:collect-xfrm-stats-twice
Oct 26, 2023
Merged
bugtool: Collect XFRM error counters twice #28790
dylandreimerink
merged 1 commit into
cilium:main
from
pchaigno:collect-xfrm-stats-twice
Oct 26, 2023
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tklauser
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LGTM, one question inline to help my own understanding.
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This commit changes the bugtool report to collect the XFRM error counters (i.e., /proc/net/xfrm_stat) twice instead of only once. We will collect at the beginning and end of the bugtool collection. In that way, there will be around 5-6 seconds between the two collections and we may see if any counter is currently increasing. $ diff cilium-bugtool-cilium-7d54p-20231025-115151/cmd/cat*--proc-net-xfrm_stat.md 5c5 < XfrmInStateProtoError 4 --- > XfrmInStateProtoError 6 In this example, we can easily see that the XfrmInStateProtoError is increasing. That suggests a key rotation issue is currently ongoing (cf. IPsec troubleshooting docs). I tried other approaches to collect over a longer timespan. That may allow us to see slower increases. They all end up being more complex or messier (we'd need to collect at beginning and end of the sysdump instead). In the end, considering this is already a fallback plan for when customers don't collect Prometheus metrics, I think the current, simpler approach is good enough. Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
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This was referenced Nov 12, 2023
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Labels
area/bugtool
Impacts gathering of data for debugging purposes.
area/encryption
Impacts encryption support such as IPSec, WireGuard, or kTLS.
backport-done/1.12
The backport for Cilium 1.12.x for this PR is done.
backport-done/1.13
The backport for Cilium 1.13.x for this PR is done.
backport-done/1.14
The backport for Cilium 1.14.x for this PR is done.
ready-to-merge
This PR has passed all tests and received consensus from code owners to merge.
release-note/misc
This PR makes changes that have no direct user impact.
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This pull request changes the bugtool report to collect the XFRM error counters (i.e.,
/proc/net/xfrm_stat
) twice instead of only once. We will collect at the beginning and end of the bugtool collection. In that way, there will be around 5-6 seconds between the two collections and we may see if any counter is currently increasing.In this example, we can easily see that the
XfrmInStateProtoError
is increasing. That suggests a key rotation issue is currently ongoing (cf. IPsec troubleshooting docs).I tried other approaches to collect over a longer timespan. That may allow us to see slower increases. They all end up being more complex or messier (we'd need to collect at beginning and end of the sysdump instead). In the end, considering this is already a fallback plan for when customers don't collect Prometheus metrics, I think the current, simpler approach is good enough.
Fixes: #16538.