TUN-7275: Make QuickTunnels only use a single connection to the edge

CHANGES.md

@@ -1,3 +1,7 @@
+## 2023.3.2
+### Notices
+- Due to the nature of QuickTunnels (https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/do-more-with-tunnels/trycloudflare/) and its intended usage for testing and experiment of Cloudflare Tunnels, starting from 2023.3.2, QuickTunnels only make a single connection to the edge. If users want to use Tunnels in a production enverionment, they should move to Named Tunnels instead. (https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/install-and-setup/tunnel-guide/remote/#set-up-a-tunnel-remotely-dashboard-setup)
+
 ## 2023.3.1
 ### Breaking Change
 - Running a tunnel without ingress rules defined in configuration file nor from the CLI flags will no longer provide a default ingress rule to localhost:8080 and instead will return HTTP response code 503 for all incoming HTTP requests.

cmd/cloudflared/tunnel/cmd.go

@@ -42,6 +42,9 @@ import (
 const (
 	sentryDSN = "https://56a9c9fa5c364ab28f34b14f35ea0f1b:3e8827f6f9f740738eb11138f7bebb68@sentry.io/189878"
 
+	// ha-Connections specifies how many connections to make to the edge
+	haConnectionsFlag = "ha-connections"
+
 	// sshPortFlag is the port on localhost the cloudflared ssh server will run on
 	sshPortFlag = "local-ssh-port"
 
@@ -418,7 +421,7 @@ func StartServer(
 		errC <- metrics.ServeMetrics(metricsListener, ctx, metricsConfig, log)
 	}()
 
-	reconnectCh := make(chan supervisor.ReconnectSignal, c.Int("ha-connections"))
+	reconnectCh := make(chan supervisor.ReconnectSignal, c.Int(haConnectionsFlag))
 	if c.IsSet("stdin-control") {
 		log.Info().Msg("Enabling control through stdin")
 		go stdinControl(reconnectCh, log)
@@ -655,7 +658,7 @@ func tunnelFlags(shouldHide bool) []cli.Flag {
 			Hidden:  shouldHide,
 		}),
 		altsrc.NewIntFlag(&cli.IntFlag{
-			Name:   "ha-connections",
+			Name:   haConnectionsFlag,
 			Value:  4,
 			Hidden: true,
 		}),

cmd/cloudflared/tunnel/configuration.go

@@ -293,7 +293,7 @@ func prepareTunnelConfig(
 		Region:          c.String("region"),
 		EdgeIPVersion:   edgeIPVersion,
 		EdgeBindAddr:    edgeBindAddr,
-		HAConnections:   c.Int("ha-connections"),
+		HAConnections:   c.Int(haConnectionsFlag),
 		IncidentLookup:  supervisor.NewIncidentLookup(),
 		IsAutoupdated:   c.Bool("is-autoupdated"),
 		LBPool:          c.String("lb-pool"),

cmd/cloudflared/tunnel/quick_tunnel.go

@@ -73,6 +73,9 @@ func RunQuickTunnel(sc *subcommandContext) error {
 		sc.c.Set("protocol", "quic")
 	}
 
+	// Override the number of connections used. Quick tunnels shouldn't be used for production usage,
+	// so, use a single connection instead.
+	sc.c.Set(haConnectionsFlag, "1")
 	return StartServer(
 		sc.c,
 		buildInfo,

component-tests/test_quicktunnels.py

@@ -8,7 +8,7 @@ class TestQuickTunnels:
         config = component_tests_config(cfd_mode=CfdModes.QUICK, run_proxy_dns=False)
         LOGGER.debug(config)
         with start_cloudflared(tmp_path, config, cfd_args=["--hello-world"], new_process=True):
-            wait_tunnel_ready(require_min_connections=4)
+            wait_tunnel_ready(require_min_connections=1)
             url = get_quicktunnel_url()
             send_requests(url, 3, True)