Sitespeed – multi docker error : _XSERVTransSocketUNIXCreateListener

When i run multiple sitespeed docker , i faced this error

[2020-04-02 22:14:11] INFO: Versions OS: linux 3.10.0-1062.1.2.el7.x86_64 nodejs: v10.16.0 10.0.1 browsertime: 6.0.1 coach: 4.0.1
[2020-04-02 22:14:11] ERROR: Error: _XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE)

at ChildProcess.self._process.on (/usr/src/app/node_modules/@cypress/xvfb/index.js:189:23)
at ChildProcess.emit (events.js:198:13)
at maybeClose (internal/child_process.js:982:16)
at (internal/child_process.js:389:11)
at Socket.emit (events.js:198:13)
at Pipe._handle.close (net.js:606:12)

To fix this i have to add 2 parameters to sitespeed command:

--browsertime.xvfb "true" 		--browsertime.xvfbParams.display "$(((RANDOM % 1000)+100))" 

It turned out that the above fix will kill the video capture. After looking through my change log, the option “–name ” was actually the root cause. It looks like when we use the –name option, docker will reuse the socket. The final fix was to remove that option (–name)

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