feat: reuseport activator - #196
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This adds a completely new activator that makes use of bpf_sk_select_reuseport to steer wake/probe traffic instead of a userspace proxy+port rewrites. With this, zeropod is completely out of the data path for normal app traffic.
when concurrent connections hit the wake listener, we only want to register the app listeners once.
ctrox
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Aug 9, 2026
| // Because we syscall.Setfsuid inside ns.Do, this should be safe as | ||
| // it takes care to lock the os thread. | ||
| eUIDBefore := os.Geteuid() | ||
| if err := syscall.Setfsuid(ln.app.uid); err != nil { |
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when restoring from a migrated checkpoint, the uid will always be 0 and the restore will fail if the checkpoint has a different one stored. We could also put it in the listener metadata in the migration or come up with some kind of recovery mechanism where we can detect a mismatch.
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This unifies the two activator APIs into an interface, making it possible to simply switch between them in the shim depending on the config.
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This makes it more durable and also allows to migrate from the old to the new activator while keeping the same checkpoint image. This also adds bind4/bind6 programs to ensure all listeners have SO_REUSEPORT set.
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This adds a completely new activator that makes use of bpf_sk_select_reuseport to steer wake/probe traffic instead of a userspace proxy+port rewrites. With this, zeropod is completely out of the data path for normal app traffic.