diff --git a/integration/106_launch_with_peers_test.sh b/integration/106_launch_with_peers_test.sh
new file mode 100755
index 000000000..d4a5e94da
--- /dev/null
+++ b/integration/106_launch_with_peers_test.sh
@@ -0,0 +1,13 @@
+#! /bin/bash
+
+. ./config.sh
+
+start_suite "Launch scope and check it boots, with a spurious host arg"
+
+scope_on $HOST1 launch noatrealhost.foo
+
+wait_for_containers $HOST1 60 weavescope
+
+has_container $HOST1 weavescope
+
+scope_end_suite
diff --git a/integration/205_clustering_sans_weave_2_test.sh b/integration/205_clustering_sans_weave_2_test.sh
index abd498682..21d5921a6 100755
--- a/integration/205_clustering_sans_weave_2_test.sh
+++ b/integration/205_clustering_sans_weave_2_test.sh
@@ -4,8 +4,8 @@
 
 start_suite "Launch 2 scopes and check they cluster (without weave)"
 
-scope_on $HOST1 launch $HOST1 $HOST2
-scope_on $HOST2 launch $HOST1 $HOST2
+scope_on $HOST1 launch $HOST2
+scope_on $HOST2 launch $HOST1
 
 docker_on $HOST1 run -dit --name db1 peterbourgon/tns-db
 docker_on $HOST2 run -dit --name db2 peterbourgon/tns-db
diff --git a/integration/215_clustering_split_2_test.sh b/integration/215_clustering_split_2_test.sh
new file mode 100755
index 000000000..7a399976d
--- /dev/null
+++ b/integration/215_clustering_split_2_test.sh
@@ -0,0 +1,17 @@
+#! /bin/bash
+
+. ./config.sh
+
+start_suite "Launch 2 scopes and check they cluster (without weave)"
+
+scope_on $HOST1 launch --no-app $HOST2
+scope_on $HOST2 launch --no-probe
+
+docker_on $HOST1 run -dit --name db1 peterbourgon/tns-db
+
+sleep 30 # need to allow the scopes to poll dns, resolve the other app ids, and send them reports.
+
+has_container $HOST2 weavescope
+has_container $HOST2 db1
+
+scope_end_suite
diff --git a/prog/main.go b/prog/main.go
index 0f701109b..72d999f3e 100644
--- a/prog/main.go
+++ b/prog/main.go
@@ -68,6 +68,7 @@ type probeFlags struct {
 	logPrefix       string
 	logLevel        string
 	resolver        string
+	noApp           bool
 
 	dockerEnabled  bool
 	dockerInterval time.Duration
@@ -115,12 +116,13 @@ func main() {
 	flag.BoolVar(&debug, "debug", false, "Force debug logging.")
 	flag.StringVar(&weaveHostname, "weave.hostname", "", "Hostname to advertise/lookup in WeaveDNS")
 
-	// We can ignore these - we need to know how to parse them, but they are interpreted by the entrypoint script.
-	// They are also here so they are included in usage.
-	flag.Bool("no-app", false, "Don't run the app.")
+	// We need to know how to parse them, but they are mainly interpreted by the entrypoint script.
+	// They are also here so they are included in usage, and the probe uses them to decide if to
+	// publish to localhost.
+	noApp := flag.Bool("no-app", false, "Don't run the app.")
+	probeOnly := flag.Bool("app-only", false, "Only run the app")
 	flag.Bool("probe-only", false, "Only run the probe.")
 	flag.Bool("no-probe", false, "Don't run the probe.")
-	flag.Bool("app-only", false, "Only run the app")
 
 	// Probe flags
 	flag.StringVar(&flags.probe.token, "service-token", "", "Token to use to authenticate with scope.weave.works")
@@ -176,6 +178,7 @@ func main() {
 		flags.probe.weaveHostname = weaveHostname
 		flags.app.weaveHostname = weaveHostname
 	}
+	flags.probe.noApp = *noApp || *probeOnly
 
 	switch mode {
 	case "app":
diff --git a/prog/probe.go b/prog/probe.go
index b0c2673bc..89d806232 100644
--- a/prog/probe.go
+++ b/prog/probe.go
@@ -94,9 +94,12 @@ func probeMain(flags probeFlags) {
 	}
 	go check(checkpointFlags)
 
-	var targets = []string{fmt.Sprintf("localhost:%d", xfer.AppPort)}
+	var targets = []string{}
+	if !flags.noApp {
+		targets = append(targets, fmt.Sprintf("localhost:%d", xfer.AppPort))
+	}
 	if len(flag.Args()) > 0 {
-		targets = flag.Args()
+		targets = append(targets, flag.Args()...)
 	}
 	log.Infof("publishing to: %s", strings.Join(targets, ", "))