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docs: Document limitation for kernels without netns cookie #17575

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On kernels without support for netns cookies, services are accessible via the loopback address from all pods. That is because Cilium cannot distinguish between host and pod namespaces in that case.

@pchaigno pchaigno added area/documentation Impacts the documentation, including textual changes, sphinx, or other doc generation code. release-note/misc This PR makes changes that have no direct user impact. sig/loadbalancing labels Oct 11, 2021
@pchaigno pchaigno requested a review from a team as a code owner October 11, 2021 21:51
@pchaigno pchaigno requested review from a team and joestringer October 11, 2021 21:51
@pchaigno pchaigno force-pushed the document-netns-cookie-limitation branch from 4f8bebb to 9192125 Compare October 11, 2021 21:57
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@maintainer-s-little-helper maintainer-s-little-helper bot added the dont-merge/needs-sign-off The author needs to add signoff to their commits before merge. label Oct 12, 2021
On kernels without support for netns cookies, services are accessible
via the loopback address from all pods. That is because Cilium cannot
distinguish between host and pod namespaces in that case.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Paul Chaignon <paul@cilium.io>
@pchaigno pchaigno force-pushed the document-netns-cookie-limitation branch from 22ca27a to 2b9fa2e Compare October 12, 2021 08:26
@maintainer-s-little-helper maintainer-s-little-helper bot removed the dont-merge/needs-sign-off The author needs to add signoff to their commits before merge. label Oct 12, 2021
@joestringer joestringer merged commit 2136dd8 into cilium:master Oct 12, 2021
@pchaigno pchaigno deleted the document-netns-cookie-limitation branch October 12, 2021 15:39
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3 participants