@@ -2032,3 +2032,29 @@ func TestLegacyLinksEnvVars(t *testing.T) {

 		})

 	}

 }

+

+// TestDNSNamesForNonSwarmScopedNetworks checks that container names can be resolved for non-swarm-scoped networks once

+// a node has joined a Swarm cluster.

+//

+// Regression test for https://github.com/moby/moby/issues/51491.

+func TestDNSNamesForNonSwarmScopedNetworks(t *testing.T) {

+	ctx := setupTest(t)

+

+	d := daemon.New(t)

+	d.StartAndSwarmInit(ctx, t)

+	defer d.Stop(t)

+

+	c := d.NewClientT(t)

+	defer c.Close()

+

+	const bridgeName = "dnsnames-with-swarm"

+	network.CreateNoError(ctx, t, c, bridgeName)

+	defer network.RemoveNoError(ctx, t, c, bridgeName)

+

+	res := container.RunAttach(ctx, t, c,

+		container.WithName("test"),

+		container.WithCmd("nslookup", "-type=a", "test."),

+		container.WithNetworkMode(bridgeName),

+		container.WithAutoRemove)

+	assert.Equal(t, res.ExitCode, 0, "exit code: %d, expected 0; stdout:\n%s", res.ExitCode, res.Stdout)

+}