Cypress: Error: Could not start Xvfb. Install XVFB and run Cypress again.

[davidcelis]

Hi, folks! I'm using Cypress to run an end-to-end testing suite against an application I work on. I've been running into a really weird issue with the docker images, one which only seems to happen on our CI (TeamCity); I haven't been able to reproduce it locally.

Running cypress verify in the Docker image ends up failing and saying that Xvfb is not installed, even though it's listed in the Dockerfile as a dependency to be installed. Simply restarting a build is enough to get the Docker setup back into the right state, and then the tests can run just fine. Here is a log of pulling and starting the Cypress docker image; between failing and passing builds, nothing changes. The same image sha ends up being pulled but sometimes fails to detect Xvfb.

[09:07:49]  [Step 3/11] Temporary file was created: /opt/teamcity-agent/work/5c5a013f643109a5/Dockerfile_TC_1523290069059-temp
[09:07:49]  [Step 3/11] Starting: docker build -t SCRUBBED --pull --label "branch=refs/heads/master" --label "commit=SCRUBBED" -f /opt/teamcity-agent/work/5c5a013f643109a5/Dockerfile_TC_1523290069059-temp .
[09:07:49]  [Step 3/11] in directory: /opt/teamcity-agent/work/5c5a013f643109a5
[09:07:49]  [Step 3/11] 
[09:07:49]  [Step 3/11] Step 1/6 : FROM cypress/base:8
[09:07:50]  [Step 3/11] 8: Pulling from cypress/base
[09:07:50]  [Step 3/11] f2b6b4884fc8: Already exists
[09:07:50]  [Step 3/11] 4fb899b4df21: Already exists
[09:07:50]  [Step 3/11] 74eaa8be7221: Already exists
[09:07:51]  [Step 3/11] 2d6e98fe4040: Already exists
[09:07:51]  [Step 3/11] 452c06dec5fa: Pulling fs layer
[09:07:51]  [Step 3/11] 7b3c215894de: Pulling fs layer
[09:07:51]  [Step 3/11] c62e8e1f22ef: Pulling fs layer
[09:07:51]  [Step 3/11] 93263a0b6217: Pulling fs layer
[09:07:51]  [Step 3/11] 344085b70f46: Pulling fs layer
[09:07:51]  [Step 3/11] f18709ef8150: Pulling fs layer
[09:07:51]  [Step 3/11] 16b62243dd9a: Pulling fs layer
[09:07:51]  [Step 3/11] f18709ef8150: Waiting
[09:07:51]  [Step 3/11] 344085b70f46: Waiting
[09:07:51]  [Step 3/11] 16b62243dd9a: Waiting
[09:07:51]  [Step 3/11] 93263a0b6217: Waiting
[09:07:51]  [Step 3/11] 452c06dec5fa: Verifying Checksum
[09:07:51]  [Step 3/11] 7b3c215894de: Download complete
[09:07:51]  [Step 3/11] 452c06dec5fa: Pull complete
[09:07:51]  [Step 3/11] 7b3c215894de: Pull complete
[09:07:51]  [Step 3/11] c62e8e1f22ef: Verifying Checksum
[09:07:51]  [Step 3/11] c62e8e1f22ef: Download complete
[09:07:51]  [Step 3/11] 93263a0b6217: Verifying Checksum
[09:07:51]  [Step 3/11] 93263a0b6217: Download complete
[09:07:52]  [Step 3/11] 16b62243dd9a: Verifying Checksum
[09:07:52]  [Step 3/11] 16b62243dd9a: Download complete
[09:07:52]  [Step 3/11] f18709ef8150: Verifying Checksum
[09:07:53]  [Step 3/11] c62e8e1f22ef: Pull complete
[09:07:53]  [Step 3/11] 344085b70f46: Verifying Checksum
[09:07:53]  [Step 3/11] 344085b70f46: Download complete
[09:07:53]  [Step 3/11] 93263a0b6217: Pull complete
[09:07:57]  [Step 3/11] 344085b70f46: Pull complete
[09:07:58]  [Step 3/11] f18709ef8150: Pull complete
[09:07:58]  [Step 3/11] 16b62243dd9a: Pull complete
[09:07:58]  [Step 3/11] Digest: sha256:d82d1db790e5a585b1db2e0f8fe3ff343d981ba18db477e40a0b498e04c73e23
[09:07:58]  [Step 3/11] Status: Downloaded newer image for cypress/base:8
[09:07:58]  [Step 3/11]  ---> ed9c4e411f39
[09:07:58]  [Step 3/11] Step 2/6 : ADD integration-tests /src/integration-tests
[09:07:59]  [Step 3/11]  ---> 14d57ea2af4d
[09:07:59]  [Step 3/11] Removing intermediate container 66e0363b40eb
[09:07:59]  [Step 3/11] Step 3/6 : WORKDIR /src/integration-tests
[09:07:59]  [Step 3/11]  ---> 3071a36c58b5
[09:07:59]  [Step 3/11] Removing intermediate container 478a01054b29
[09:07:59]  [Step 3/11] Step 4/6 : RUN yarn install
[09:07:59]  [Step 3/11]  ---> Running in e9ca1a3678ff
[09:08:05]  [Step 3/11] yarn install v1.5.1
[09:08:05]  [Step 3/11] [1/4] Resolving packages...
[09:08:06]  [Step 3/11] [2/4] Fetching packages...
[09:08:10]  [Step 3/11] [3/4] Linking dependencies...
[09:08:12]  [Step 3/11] [4/4] Building fresh packages...
[09:08:52]  [Step 3/11] Done in 46.50s.
[09:09:00]  [Step 3/11]  ---> b8cb0306c75a
[09:09:03]  [Step 3/11] Removing intermediate container e9ca1a3678ff
[09:09:03]  [Step 3/11] Step 5/6 : RUN $( yarn bin )/cypress verify
[09:09:03]  [Step 3/11]  ---> Running in 109a9fd4ae07
[09:09:04]  [Step 3/11] It looks like this is your first time using Cypress: 2.1.0
[09:09:04]  [Step 3/11] 
[09:09:04]  [Step 3/11] [16:09:04]  Verifying Cypress can run /src/integration-tests/node_modules/cypress/dist/Cypress [started]
[09:09:06]  [Step 3/11] [16:09:06]  Verifying Cypress can run /src/integration-tests/node_modules/cypress/dist/Cypress [failed]
[09:09:06]  [Step 3/11] [16:09:06] → Your system is missing the dependency: XVFB
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Install XVFB and run Cypress again.
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Read our documentation on dependencies for more information:
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] https://on.cypress.io/required-dependencies
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] If you are using Docker, we provide containers with all required dependencies installed.
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Caught error trying to run XVFB: "Your system is missing the dependency: XVFB
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Install XVFB and run Cypress again.
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Read our documentation on dependencies for more information:
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] https://on.cypress.io/required-dependencies
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] If you are using Docker, we provide containers with all required dependencies installed.
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Error: Could not start Xvfb.
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Platform: linux (Debian - 8.10)
[09:09:06]  [Step 3/11] Cypress Version: 2.1.0"
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Platform: linux (Debian - 8.10)
[09:09:06]  [Step 3/11] Cypress Version: 2.1.0
[09:09:06]  [Step 3/11] Your system is missing the dependency: XVFB
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Install XVFB and run Cypress again.
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Read our documentation on dependencies for more information:
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] https://on.cypress.io/required-dependencies
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] If you are using Docker, we provide containers with all required dependencies installed.
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Caught error trying to run XVFB: "Your system is missing the dependency: XVFB
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Install XVFB and run Cypress again.
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Read our documentation on dependencies for more information:
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] https://on.cypress.io/required-dependencies
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] If you are using Docker, we provide containers with all required dependencies installed.
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Error: Could not start Xvfb.
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Platform: linux (Debian - 8.10)
[09:09:06]  [Step 3/11] Cypress Version: 2.1.0"
[09:09:06]  [Step 3/11] ----------
[09:09:06]  [Step 3/11] 
[09:09:06]  [Step 3/11] Platform: linux (Debian - 8.10)
[09:09:06]  [Step 3/11] Cypress Version: 2.1.0
[09:09:07]  [Step 3/11] The command '/bin/sh -c $( yarn bin )/cypress verify' returned a non-zero code: 1
[09:09:07]  [Step 3/11] The command '/bin/sh -c $( yarn bin )/cypress verify' returned a non-zero code: 1
[09:09:07]  [Step 3/11]
[09:09:07]  [Step 3/11] Process exited with code 1
[09:09:07]  [Step 3/11] Process exited with code 1
[09:09:07]  [Step 3/11] Step   ‍♀️ build integration-tests docker image (Docker Build) failed

[bahmutov]

Interesting, and we see this randomly on TravisCI when using Docker - XVFB not being detected, but restarting the build solves it. I wonder if increasing the timeout when passed as an option to https://github.com/cypress-io/xvfb/blob/master/index.js would solve this problem. This is so transient that we did not look into this, but seems different CIs can encounter it

[flegall]

I've also reproduced this issue on gitlab-ci.

[davidcelis]

It's been happening more and more frequently for us as time goes on; nearly one in five of our builds fail because Xvfb doesn't start in the container. Have you tried the timeout increase yet with any success?

[avevlad]

in docker


  (Tests Finished)

  - Tests:           1
  - Passes:          1
  - Failures:        0
  - Pending:         0
  - Duration:        4 seconds
  - Screenshots:     1
  - Video Recorded:  false
  - Cypress Version: 2.1.0


  (Screenshots)

  - /www/qw/cypress/screenshots/Simple test -- Login -- go to login.png (1280x720)
Wed, 18 Apr 2018 22:41:11 GMT cypress:server:headless attempting to close the browser
Wed, 18 Apr 2018 22:41:11 GMT cypress:server:browsers killing browser process
Wed, 18 Apr 2018 22:41:35 GMT cypress:server:timers child sending timer id 3
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2018-04-18T22:42:36.939Z cypress:cli Stopping XVFB
2018-04-18T22:42:36.951Z
result simple {
  "failures": null,
  "message": "Could not find Cypress test run results"
}

[bahmutov]

If we can have exact dockerfile, setup instructions and the minimal test repository, we could debug this to find which system is failing.

Sent from my iPhone

On Apr 18, 2018, at 18:53, Vlad [e-mail] wrote:

in docker

�[0m
(Tests Finished)

• Tests: 1
• Passes: 1
• Failures: 0
• Pending: 0
• Duration: 4 seconds
• Screenshots: 1
• Video Recorded: false

• Cypress Version: 2.1.0

  (Screenshots)

• /www/qw/cypress/screenshots/Simple test -- Login -- go to login.png (1280x720)
  �[91mWed, 18 Apr 2018 22:41:11 GMT cypress:server:headless attempting to close the browser
  �[0m�[91mWed, 18 Apr 2018 22:41:11 GMT cypress:server:browsers killing browser process
  �[0m�[91mWed, 18 Apr 2018 22:41:35 GMT cypress:server:timers child sending timer id 3
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  �[0m�[91m2018-04-18T22:42:36.939Z cypress:cli Stopping XVFB
  �[0m2018-04-18T22:42:36.951Z
  result simple {
  "failures": null,
  "message": "Could not find Cypress test run results"
  }
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[davidcelis]

@AveVlad Sorry, but that seems unrelated to the problem reported in this issue, which is Xvfb failing to start in the first place when using the docker image.

[davidcelis]

Sorry to bug you again, but these Xvfb errors are becoming even more frequent on our CI… Have you tried the timeout increase yet with any success?

[bahmutov]

Yes, we are increasing the default xvfb start time out from 2 seconds to 5 seconds in cypress 3.0.0

Sent from my iPhone

On Apr 26, 2018, at 18:55, David Celis [e-mail] wrote:

Sorry to bug you again, but these Xvfb errors are becoming even more frequent on our CI… Have you tried the timeout increase yet with any success?

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[blalor]

@bahmutov looks like 3.0.0 has been released. Did this fix make it in? Can you link the relevant commit here, please?

[davidcelis]

would also love to know if the fix for this made it into 3.0.0. thanks!

[brian-mann]

It did actually - it was not correctly set to a milestone so it was missed when doing the changelog.

It was bumped up to 5 seconds... but now that I think about it, I have no idea why we wouldn't set it to something like 30 seconds. I have seen situations where builds fail due to shutting off xvfb or starting it up.

https://github.com/cypress-io/cypress/blob/97e3092300e4487e9db01ad33d0ebb0acee7b4f2/cli/lib/exec/xvfb.js#L10

[sharitonchik]

We also see some times when tests fails with "Could not start Xvfb".
Cypress 3.0.2

[guigonc]

We have the same problem on version 3.1.0

[gcyu]

Last time I met this issue, the root cause is that the "Xvfb" process is already running, and cypress can not start it with errors like:

It looks like this is your first time using Cypress: 3.1.0

 ✖  Verifying Cypress can run /home/mi/.cache/Cypress/3.1.0/Cypress
   → Cypress Version: 3.1.0
Your system is missing the dependency: XVFB

Install XVFB and run Cypress again.

Read our documentation on dependencies for more information:

https://on.cypress.io/required-dependencies

If you are using Docker, we provide containers with all required dependencies installed.
----------

Caught error trying to run XVFB: "XVFB exited with a non zero exit code.

There was a problem spawning Xvfb.

This is likely a problem with your system, permissions, or installation of Xvfb.
----------

Error: _XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE)
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE)
----------

Platform: linux (Red Hat Linux - 7.4)
Cypress Version: 3.1.0"
----------

Platform: linux (Red Hat Linux - 7.4)
Cypress Version: 3.1.0

Then I checked that there're really some running processes of Xvfb in system,

ps -ef | grep Xvfb

and after I killed them everything went well.

ps -ef | grep Xvfb | grep -v grep | awk '{print $2}' | xargs kill -9

So in my case, this is not a problem with Cypress. Hope it helps.

[muslim-niche]

@yuguangchuan

ps -ef | grep Xvfb | grep -v grep | awk '{print $2}' | xargs kill -9

it worked for me. :)

[mel1nn]

I had the same problem.

To resolve it, I installed xvfb: sudo apt-get install xvfb.

After that, I had an other problem which tells me that libgconf-2.so.4 cannot be loaded.
-> apt-get install libgconf-2-4

And it works !

[davidcelis]

@mel1nn Unfortunately, that's not really a solution to this issue. Please note that this repository is for the Cypress docker images, which already list xvfb and libgconf-2-4 as dependencies.

[VincentLanglet]

I use the last Cypress version and I stil have randomly this error.

[leorigon]

We has this same problem with Jenkins. Someone fixed it?

[LeBenLeBen]

Landing here with the same error on Gitlab CI. When I use cypress/base:10 and use Electron, it works fine. If I switch to cypress/browsers:chrome67 or cypress/browsers:chrome69 and run Cypress with browser set to Chrome, I get the error above all the time.

[Junaid-Aslam1]

I am running into the same issue on bamboo CI. It happens intermittently.

[gcirone]

It's happens when another plan/process is executing in the same time as _bamboo ci_ use a docker image with network=host. This is a pain we need to find a correct solution for this problem.

Error: XVFB exited with a non zero exit code.
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 There was a problem spawning Xvfb.
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 This is likely a problem with your system, permissions, or installation of Xvfb.
error 06-May-2019 05:20:38 ----------
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 Error: _XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
error 06-May-2019 05:20:38 _XSERVTransMakeAllCOTSServerListeners: server already running
error 06-May-2019 05:20:38 (EE)
error 06-May-2019 05:20:38 Fatal server error:
error 06-May-2019 05:20:38 (EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE)
error 06-May-2019 05:20:38 ----------
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 Platform: linux (Centos - 7.4.1708)
error 06-May-2019 05:20:38 Cypress Version: 3.1.4
error 06-May-2019 05:20:38 Error: Error: XVFB exited with a non zero exit code.
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 There was a problem spawning Xvfb.
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 This is likely a problem with your system, permissions, or installation of Xvfb.
error 06-May-2019 05:20:38 ----------
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 Error: _XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
error 06-May-2019 05:20:38 _XSERVTransMakeAllCOTSServerListeners: server already running
error 06-May-2019 05:20:38 (EE)
error 06-May-2019 05:20:38 Fatal server error:
error 06-May-2019 05:20:38 (EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE)
error 06-May-2019 05:20:38 ----------
error 06-May-2019 05:20:38
error 06-May-2019 05:20:38 Platform: linux (Centos - 7.4.1708)
error 06-May-2019 05:20:38 Cypress Version: 3.1.4`

Someone could confirm is because the network mode host?

[davidcelis]

@gcirone We've never run the Cypress docker image with host mode networking, so I don't think that's related to the originally reported problem

[gcirone]

@davidcelis something block the second process is the first for any reason take more time or get freeze on some test.

The error message is quite explicative:
_XSERVTransMakeAllCOTSServerListeners: server already running

My question is: If the network mode is host the Xvfb process is shared between builds?

[davidcelis]

@gcirone Maybe? But as I said, we don't run our image with host networking, so my originally reported Could not start Xvfb is unlikely to be related to host networking at all.

[gcirone]

Yes true @davidcelis I'll raise a new issue specific to my problem :)

[drewbrend]

We hadn't seen this error since upgrading to 3.0.0 until today. We saw it once in CI - nothing has changed with our docker container so this is definitely the timeout issue.

Brian mentions here that there's no reason this timeout couldn't be extended to 30 seconds, can that be prioritized? https://github.com/cypress-io/cypress-docker-images/issues/39#issuecomment-395606998

[brian-mann]

There's a bunch of new logic in 3.3.1 for handling Xvfb - if DISPLAY is already set we attempt to use that x-server - and if that fails we then attempt to spawn Xvfb.

Not sure if that'll help these issues at all.

[grimunit]

Anyone tried out version 3.3.1 to see if this issue is still happening?

[obartra]

I still repro on 3.3.2

[jirkace]

Reproduced in 3.4.0

[bahmutov]

Can someone grab the full debug logs when it happens and paste here? I am thinking something like this DEBUG=cypress:cli,xvfb

[jirkace]

@bahmutov

xvfb-debug.log

[esingletary]

We've been running into this issue using Concourse CI, running cypress/included:3.4.1. I have the debug logs for the run, it looks like xvfb is timing out after 5 seconds. Any ideas on how to fix this? Re-running the build will sometimes allow it to pass, but it's intermittent.

We're using Cypress 3.4.1 with an Nx Workspace.

https://gist.github.com/esingletary/9957f0d6755740e6abc34192de22c6bb

[bahmutov]

This is a 5 second timeout set in https://github.com/cypress-io/cypress/blob/develop/cli/lib/exec/xvfb.js#L11 It seems like a very short and we should just increase it 30 seconds. Let me move this issue main Cypress repo so I can do the increase

[cypress-bot[bot]]

The code for this is done in cypress-io/cypress#5114, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[pdcl09]

@bahmutov : when do you anticipate to release these changes?

[bahmutov]

We will try to release it this month, meanwhile, it is possible to patch Cypress NPM module yourself, see how https://docs.cypress.io/guides/guides/debugging.html#Patch-Cypress

[pdcl09]

@bahmutov : can this patch be implemented for 3.4.0 version as well? I dont want to bump up the version to 3.4.1 as our docker image is set to use 3.4.0. Any suggestions would be helpful. Thanks

[bahmutov]

@pdcl09 we will not backport any patches, but you can take v3.4.0 and create a patch yourself as our documentation describes - it is only changing a single constant there.

[pdcl09]

Perfect, that helps. Thank you so much.

[pdcl09]

@bahmutov : Are you aware of any scenario where cypress tests still fail after doing the patch fix?

[swimmer-zone]

Still having this issue on Cypress 3.4.1 on Bitbucket pipelines:

It looks like this is your first time using Cypress: 3.4.1

[12:39:34]  Verifying Cypress can run /root/.cache/Cypress/3.4.1/Cypress [started]
[12:39:34]  Verifying Cypress can run /root/.cache/Cypress/3.4.1/Cypress [failed]
Your system is missing the dependency: Xvfb

Install Xvfb and run Cypress again.

Read our documentation on dependencies for more information:
https://on.cypress.io/required-dependencies

----------
Error: spawn Xvfb ENOENT
----------

I'm sure that XVFB is installed

[jennifer-shehane]

The fix will for this will be released in 3.5.0. The bug will exist in 3.4.1 as noted in this comment: https://github.com/cypress-io/cypress/issues/5110#issuecomment-530019785

[vaske]

I have same error as @Yupsie :(
@jennifer-shehane thanks for update

[cypress-bot[bot]]

Released in 3.5.0.

[jdmairs]

I'm still seeing this on GitLab CI with cypress v3.6.1

[vakaobr]

+1 still seeing this on GitLab CI with cypress v3.6.1

[simholte]

+1 I'm still seeing this on GitLab CI with cypress v3.6.1

[takasoft]

It seems like I just forgot to install the dependencies. It worked after installing those.
https://docs.cypress.io/guides/guides/continuous-integration.html#Dependencies

[jennifer-shehane]

This issue will be closed to further comment as the exact issue here was resolved and tested.

If you're experiencing a bug similar to this in Cypress, please open a new issue with a fully reproducible example that we can run. There may be a specific edge case with the issue that we need more detail to fix.