[registry-facade] Support zero-downtime updates #2600
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This PR adds live socket handover support to registry-facade. Through this method we can update registry-facade without any downtime. The process is described in #2512.
To make the handover work, we have to run registry-facade in the
hostNetwork. Otherwise we'd attempt to re-use a socket in a network namespace that no longer exists. Hence, by default handover support is disabled.How to test
TODO(cw)
Open Questions
Kubernetes just merged support for surge rollouts in daemonSets yet (KEP, PR). It will take a while until that becomes generally available. Until then we need some other convenient way to facilitate the handover, e.g. a separate daemonSet that can be deployed prior to the update. How would that look like? Would that be its own chart?
/werft https
/werft registry-facade-handover