Cloudron down after Ubuntu/Docker update (Docker service fails to start)

[Valexico]

hi @james

I tried to restore this file but docker won't start.

Claude analysis :

• systemd (file cloudron.conf) passes --log-driver=journald
• But /etc/docker/daemon.json also defines log-driver: json-file

So what is the official fix ?

Here are some logs :

tail -n 40 ../yellowtent/platformdata/logs/box.log
  stdout: '',
  stdoutString: '',
  stdoutLineCount: 0,
  stderr: 'Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?\n',
  stderrString: 'Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?\n',
  stderrLineCount: 1,
  code: 1,
  signal: null,
  timedOut: false,
  terminated: false
}
2026-04-20T20:18:28.212Z shell: docker: docker update --memory 268435456 --memory-swap -1 redis-9d1726c8-d217-45ab-ac30-0ec5c01c4cf0 errored BoxError: docker exited with code 1 signal null
    at ChildProcess.<anonymous> (file:///home/yellowtent/box/src/shell.js:70:23)
    at ChildProcess.emit (node:events:508:28)
    at maybeClose (node:internal/child_process:1101:16)
    at Socket.<anonymous> (node:internal/child_process:457:11)
    at Socket.emit (node:events:508:28)
    at Pipe.<anonymous> (node:net:346:12) {
  reason: 'Shell Error',
  details: {},
  stdout: '',
  stdoutString: '',
  stdoutLineCount: 0,
  stderr: 'Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?\n',
  stderrString: 'Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?\n',
  stderrLineCount: 1,
  code: 1,
  signal: null,
  timedOut: false,
  terminated: false
}
2026-04-20T20:18:28.213Z cron: handleAutoupdateConfigChanged: schedule - 00 00 1,2,3,4,5 * * 0,4/Europe/Paris, policy - platform_and_apps
2026-04-20T20:18:28.215Z cron: Dynamic DNS setting changed to false
2026-04-20T20:18:28.216Z dockerproxy: start: listening on 172.18.0.1:3003
2026-04-20T20:18:28.216Z From uncaughtException handler.
2026-04-20T20:18:28.216Z Error: listen EADDRNOTAVAIL: address not available 172.18.0.1:3003
2026-04-20T20:18:28.216Z     at Server.setupListenHandle [as _listen2] (node:net:1918:21)
2026-04-20T20:18:28.216Z     at listenInCluster (node:net:1997:12)
2026-04-20T20:18:28.216Z     at node:net:2206:7
2026-04-20T20:18:28.216Z     at process.processTicksAndRejections (node:internal/process/task_queues:89:21)

sudo journalctl -u docker --since "today" | grep -A5 "error\|Error\|failed\|Failed" | head -60
Apr 20 09:14:20 srv565755 dockerd[928]: time="2026-04-20T09:14:20.051807769Z" level=warning msg="ShouldRestart failed, container will not be restarted" container=4f0cb8c35e7ba64d6a081361646cb651cc3956442e62c97946f0d15edd6de455 daemonShuttingDown=false error="restart canceled" execDuration=13h52m56.033484743s exitStatus="{0 2026-04-20 09:14:19.681121204 +0000 UTC}" hasBeenManuallyStopped=true restartCount=0
Apr 20 09:16:48 srv565755 dockerd[928]: time="2026-04-20T09:16:48.421429471Z" level=info msg="Configured log driver does not support reads, enabling local file cache for container logs" container=951df08d2fe64f854504c7f945d526f99347a3b7ffc6b5742479f18ee8595776 driver=syslog
Apr 20 09:16:48 srv565755 dockerd[928]: time="2026-04-20T09:16:48.647044948Z" level=info msg="Skipping check for route to send NA, EMSGSIZE" eid=587f20e087dc ep=1c5d0773-9eca-48f8-945e-83733391299d net=cloudron nid=b08cee04d967
Apr 20 09:16:48 srv565755 dockerd[928]: time="2026-04-20T09:16:48.653269180Z" level=info msg="sbJoin: gwep4 ''->'587f20e087dc', gwep6 ''->'587f20e087dc'" eid=587f20e087dc ep=1c5d0773-9eca-48f8-945e-83733391299d net=cloudron nid=b08cee04d967
Apr 20 11:33:17 srv565755 dockerd[928]: time="2026-04-20T11:33:17.566840739Z" level=info msg="ignoring event" container=951df08d2fe64f854504c7f945d526f99347a3b7ffc6b5742479f18ee8595776 module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Apr 20 11:33:17 srv565755 dockerd[928]: time="2026-04-20T11:33:17.626250628Z" level=warning msg="ShouldRestart failed, container will not be restarted" container=951df08d2fe64f854504c7f945d526f99347a3b7ffc6b5742479f18ee8595776 daemonShuttingDown=false error="restart canceled" execDuration=2h16m29.209514787s exitStatus="{0 2026-04-20 11:33:17.50260464 +0000 UTC}" hasBeenManuallyStopped=true restartCount=0
Apr 20 11:33:31 srv565755 dockerd[928]: time="2026-04-20T11:33:31.302996371Z" level=info msg="Configured log driver does not support reads, enabling local file cache for container logs" container=5cd41c6952e0e4a57df020a068ba8d8ad03a1962cf5166c16def923db4a19678 driver=syslog
Apr 20 11:33:31 srv565755 dockerd[928]: time="2026-04-20T11:33:31.544418039Z" level=info msg="Skipping check for route to send NA, EMSGSIZE" eid=cc6732021dd2 ep=1c5d0773-9eca-48f8-945e-83733391299d net=cloudron nid=b08cee04d967
Apr 20 11:33:31 srv565755 dockerd[928]: time="2026-04-20T11:33:31.550239968Z" level=info msg="sbJoin: gwep4 ''->'cc6732021dd2', gwep6 ''->'cc6732021dd2'" eid=cc6732021dd2 ep=1c5d0773-9eca-48f8-945e-83733391299d net=cloudron nid=b08cee04d967
Apr 20 20:17:06 srv565755 systemd[1]: Stopping docker.service - Docker Application Container Engine...
Apr 20 20:17:06 srv565755 dockerd[928]: time="2026-04-20T20:17:06.327530091Z" level=info msg="Processing signal 'terminated'"
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.546853647Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.555695229Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.555782219Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.555813540Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.566229495Z" level=info msg="ignoring event" container=0b8f6fb173a1d0e2d4dedcbfba65145ed2a57c720caab9bbe67f404771fc0c88 module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.568576383Z" level=info msg="ignoring event" container=b84eb548ee71992483f45e56428929b79bcc8aad1f7023b195c60f659780d168 module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.582046353Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.582069903Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.582693859Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.589390793Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.632285602Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.659873666Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.704349637Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.730620892Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.730674482Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.730804793Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.751950246Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.766076720Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.774481318Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.792120681Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.792250913Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.820107909Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.842432751Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.842499741Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.842352570Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.889893867Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.898854650Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.905530513Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.914025273Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.914073723Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.915739917Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.917869824Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.921901237Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.921959517Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.940298087Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.940385708Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.940415097Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.957654048Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.984816919Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.984879059Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:07 srv565755 dockerd[928]: time="2026-04-20T20:17:07.984904639Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.002561723Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.002633953Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.002662174Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.002688504Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.023282142Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.032926700Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.052743052Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=
Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.052817351Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=

[james]

Hello @valexico
So this is the actuall error:

Apr 20 20:17:08 srv565755 dockerd[928]: time="2026-04-20T20:17:08.052817351Z" level=error msg="Error writing log message" driver=syslog error="dial unix /home/yellowtent/platformdata/logs/syslog.sock: connect: no such file or directory" message=

Can you please check the status of:

systemctl status cloudron-syslog.service

[Valexico]

hi @james

Here the status on my fixed (cloudron.conf deleted). I can't check with the error as this server is used in production... I would have to test at night this not very convenient

systemctl status cloudron-syslog.service
WARNING: terminal is not fully functional
Press RETURN to continue
● cloudron-syslog.service - Cloudron Syslog
     Loaded: loaded (/etc/systemd/system/cloudron-syslog.service; enabled; preset: enabled)
     Active: active (running) since Mon 2026-04-20 20:20:34 UTC; 12h ago
   Main PID: 734 (MainThread)
      Tasks: 11 (limit: 19092)
     Memory: 71.9M (peak: 72.4M)
        CPU: 9.000s
     CGroup: /system.slice/cloudron-syslog.service
             └─734 node /home/yellowtent/box/syslog.js

[james]

Hello @valexico
Can you check if the sock file does really not exist?

/home/yellowtent/platformdata/logs/syslog.sock

[Valexico]

@james

ls -l /home/yellowtent/platformdata/logs/syslog.sock
srwxr-xr-x 1 yellowtent yellowtent 0 Apr 20 20:20 /home/yellowtent/platformdata/logs/syslog.sock

[Valexico]

@james
For what it's worth, it is also an Hostinger VPS

[ntnsndr]

@osobo Thank you so much for posting this! I also had the same issue on Hostinger this morning after a manual reboot, and the OP instructions worked.

[Valexico]

@james
Any idea what could be specific to Hostinger in this issue ? I mean It's just a raw ubuntu installation in my case where I installed manually Cloudron

[james]

Hello @ntnsndr and @valexico
That two times a Hostinger set up is having the same issue is not a coincidence.
Still, I am not sure what is going on.
The file in question exists. So why does the docker daemon suddenly act in this way.

[Valexico]

Hi @james
So what should we do at the end? My cloudron server is quite critical for my business, and deleting a config file to make it up sounds a bit scary. I would be glad to have an official fix or recommendation on this.

[james]

Hello @valexico
Can you please write a mail to support@cloudron.io and enable remote support?
Also, please give us a timeframe when we can restart processes like the docker and the box service to analyse the issue.

[joseph]

Thanks for the access @valexico . The issue has to do with the faulty ubuntu kernel update . Updating the firewall makes it work.

Technical details: Cloudron configures docker and containers to log using the syslog service (cloudron-syslog) . Because of the kernel regression, docker is unable to reach the syslog service and doesn't start anymore. The cgroupfs was not the issue.

We are making a patch release for Cloudron which fixes the firewall rules .

[Valexico]

@joseph
At the end is it related to hostinger config or any user would face this issue upon reboot ? Where does the faulty update comes from ?

[joseph]

@valexico issue is not specific to hostinger . Ubuntu has pushed a new kernel which is causing problems with Cloudron's firewall. We are making a new release to workaround this issue.