explicitly do not use the console

doc/lxc.conf.sgml.in

@@ -372,7 +372,10 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 	  <listitem>
 	    <para>
 	      Specify a path to a file where the console output will
-	      be written.
+	      be written. The keyword 'none' will simply disable the
+	      console. This is dangerous once if have a rootfs with a
+	      console device file where the application can write, the
+	      messages will fall in the host.
 	    </para>
 	  </listitem>
 	</varlistentry>

src/lxc/console.c

@@ -176,6 +176,9 @@ int lxc_create_console(struct lxc_conf *conf)
 		return -1;
 	}
 
+	if (!strcmp(console->path, "none"))
+		return 0;
+
 	if (openpty(&console->master, &console->slave,
 		    console->name, NULL, NULL)) {
 		SYSERROR("failed to allocate a pty");
@@ -300,6 +303,11 @@ int lxc_console_mainloop_add(struct lxc_epoll_descr *descr,
 		return 0;
 	}
 
+	if (console->peer == -1) {
+		INFO("no console will be used");
+		return 0;
+	}
+
 	if (lxc_mainloop_add_handler(descr, console->master,
 				     console_handler, console)) {
 		ERROR("failed to add to mainloop console handler for '%d'",