Ganeti Layer 3 Instance Connectivity

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Rudolph Bott

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Jan 23, 2026, 2:22:58 PM (9 days ago) Jan 23

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Hi List,

we will soon start investigating into routed/L3-connectivity for Ganeti instances and are wondering, if anyone already has practical experience with such setups. We know there has been work done by Wikimedia[1], which is already well documented (thanks for that!).

Our current apporach assumes that BGP connectivity from inside the instances will be a requirement (so that instances are able to e.g. announce/retract anycast prefixes by themselves). We also do not need live migration (at least not now), so super-fast (network) failovers are not a strict requirement.

The nodes themselves will also run on layer 3-only connectivity with a local bird2 instance, using BGP unnumbered to the upstream switches (see my blog post for further details[2]). This bird2 instance will also be available for downstream BGP sessions (e.g. to Ganeti instances running on the node).

Happy to hear your stories! :-)

Cheers,

Rudi

[1] https://phabricator.wikimedia.org/phame/post/view/312/ganeti_on_modern_network_design/

[2] https://blog.bott.im/bgp-unnumbered-in-2025-same-idea-different-implementations/

Rudolph Bott - bo...@sipgate.de

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