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client/tailscale,ipn/{ipnlocal,localapi}: add a pre-shutdown localAPI endpoint that terminates control connections. (#14028)

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Adds a /disconnect-control local API endpoint that just shuts down control client.
This can be run before shutting down an HA subnet router/app connector replica - it will ensure
that all connection to control are dropped and control thus considers this node inactive and tells
peers to switch over to another replica. Meanwhile the existing connections keep working (assuming
that the replica is given some graceful shutdown period).

Updates tailscale/tailscale#14020

Signed-off-by: Irbe Krumina <irbe@tailscale.com>
This commit is contained in:
Irbe Krumina
2024-11-07 19:27:53 +00:00
committed by GitHub
parent 3090461961
commit 2c8859c2e7
3 changed files with 41 additions and 0 deletions
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13
ipn/ipnlocal/local.go
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@@ -800,6 +800,19 @@ func (b *LocalBackend) pauseOrResumeControlClientLocked() {
b.cc.SetPaused((b.state == ipn.Stopped && b.netMap != nil) || (!networkUp && !testenv.InTest() && !assumeNetworkUpdateForTest()))
}
// DisconnectControl shuts down control client. This can be run before node shutdown to force control to consider this ndoe
// inactive. This can be used to ensure that nodes that are HA subnet router or app connector replicas are shutting
// down, clients switch over to other replicas whilst the existing connections are kept alive for some period of time.
func (b *LocalBackend) DisconnectControl() {
b.mu.Lock()
defer b.mu.Unlock()
cc := b.resetControlClientLocked()
if cc == nil {
return
}
cc.Shutdown()
}
// captivePortalDetectionInterval is the duration to wait in an unhealthy state with connectivity broken
// before running captive portal detection.
const captivePortalDetectionInterval = 2 * time.Second