我在用：
Firefox 30
selenium-server-standalone-2.43.1.jar
Xvfb
Ubuntu Headless Lineman
grunt spec-e2e
我能够毫无错误地运行 Xvfb、Firefox 和 lineman grunt spec-e2e。
在我运行的所有终端上export DISPLAY=:10
我Xvfb :10 -ac在一个终端上运行没有问题，我看到：
Initializing built-in extension Generic Event Extension
Initializing built-in extension SHAPE
Initializing built-in extension MIT-SHM
Initializing built-in extension XInputExtension
Initializing built-in extension XTEST
Initializing built-in extension BIG-REQUESTS
Initializing built-in extension SYNC
Initializing built-in extension XKEYBOARD
Initializing built-in extension XC-MISC
Initializing built-in extension SECURITY
Initializing built-in extension XINERAMA
Initializing built-in extension XFIXES
Initializing built-in extension RENDER
Initializing built-in extension RANDR
Initializing built-in extension COMPOSITE
Initializing built-in extension DAMAGE
Initializing built-in extension MIT-SCREEN-SAVER
Initializing built-in extension DOUBLE-BUFFER
Initializing built-in extension RECORD
Initializing built-in extension DPMS
Initializing built-in extension Present
Initializing built-in extension DRI3
Initializing built-in extension X-Resource
Initializing built-in extension XVideo
Initializing built-in extension XVideo-MotionCompensation
Initializing built-in extension SELinux
Initializing built-in extension GLX
[dix] Could not init font path element /usr/share/fonts/X11/cyrillic, removing from list!
在一个单独的终端上，我运行 Firefox：
one@node ~/github/load-balancer-service/app/js/loadbalancer/controllers $ firefox
(process:16020): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
Xlib: extension "RANDR" missing on display ":10".
最后，在我运行的 lineman 中（还有一个额外的会话lineman run）：
one@node ~/github/load-balancer-service $ lineman grunt spec-e2e
Running "spec-e2e" task
Starting selenium standalone server...
Selenium standalone server started at http://10.14.13.161:42182/wd/hub
one@node ~/github/load-balancer-service $
但是我遇到的问题是没有输出到运行 Firefox 的终端窗口。当我运行 spec-e2e 时，我确实看到 Xvfb 终端窗口有以下输出：
6 XSELINUXs still allocated at reset
SCREEN: 0 objects of 256 bytes = 0 total bytes 0 private allocs
DEVICE: 0 objects of 96 bytes = 0 total bytes 0 private allocs
CLIENT: 0 objects of 136 bytes = 0 total bytes 0 private allocs
WINDOW: 0 objects of 32 bytes = 0 total bytes 0 private allocs
PIXMAP: 1 objects of 16 bytes = 16 total bytes 0 private allocs
GC: 4 objects of 16 bytes = 64 total bytes 0 private allocs
CURSOR: 1 objects of 8 bytes = 8 total bytes 0 private allocs
TOTAL: 6 objects, 88 bytes, 0 allocs
1 PIXMAPs still allocated at reset
PIXMAP: 1 objects of 16 bytes = 16 total bytes 0 private allocs
GC: 4 objects of 16 bytes = 64 total bytes 0 private allocs
CURSOR: 1 objects of 8 bytes = 8 total bytes 0 private allocs
TOTAL: 6 objects, 88 bytes, 0 allocs
4 GCs still allocated at reset
GC: 4 objects of 16 bytes = 64 total bytes 0 private allocs
CURSOR: 1 objects of 8 bytes = 8 total bytes 0 private allocs
TOTAL: 5 objects, 72 bytes, 0 allocs
1 CURSORs still allocated at reset
CURSOR: 1 objects of 8 bytes = 8 total bytes 0 private allocs
TOTAL: 1 objects, 8 bytes, 0 allocs
1 CURSOR_BITSs still allocated at reset
TOTAL: 0 objects, 0 bytes, 0 allocs
但我没有看到 spec-e2e 的输出进入 firefox 窗口。