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

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

Scheduled Pinned Locked Moved Solved Support
kerneldockerhostinger
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  • jamesJ Offline
    jamesJ Offline
    james
    Staff
    wrote last edited by
    #19

    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
    
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    0
    • V Offline
      V Offline
      Valexico
      wrote last edited by
      #20

      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
      
      1 Reply Last reply
      1
      • jamesJ Offline
        jamesJ Offline
        james
        Staff
        wrote last edited by
        #21

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

        /home/yellowtent/platformdata/logs/syslog.sock
        
        V 2 Replies Last reply
        0
        • jamesJ james

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

          /home/yellowtent/platformdata/logs/syslog.sock
          
          V Offline
          V Offline
          Valexico
          wrote last edited by
          #22

          @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
          
          1 Reply Last reply
          1
          • jamesJ james

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

            /home/yellowtent/platformdata/logs/syslog.sock
            
            V Offline
            V Offline
            Valexico
            wrote last edited by
            #23

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

            1 Reply Last reply
            0
            • osoboO osobo

              Hello all,

              Just wanted to share what happened to me and the way to fix it in case you experience the same issue. @cloudron_admin please delete the post if not relevant.

              After applying recent Ubuntu security updates and rebooting, my Cloudron instance became unreachable.

              cloudron-support --troubleshoot
              

              showed Docker was down, and

              systemctl start docker
              

              failed while running dockerd manually worked fine.

              I've worked it out with the support of ChatGPT. Root cause : An outdated Cloudron systemd override file:

              /etc/systemd/system/docker.service.d/cloudron.conf
              

              This override replaces Docker’s default ExecStart and uses older flags (like cgroupfs) that are no longer compatible with newer Docker versions. As a result, Docker fails to start via systemd.

              Fix : Remove the override and reload systemd:

              sudo rm /etc/systemd/system/docker.service.d/cloudron.conf
              sudo systemctl daemon-reexec
              sudo systemctl daemon-reload
              sudo systemctl restart docker
              

              Verify Docker is running:

              systemctl status docker
              

              Then restart Cloudron:

              sudo systemctl restart box
              

              Result

              Docker starts normally again, containers come back up, and the Cloudron dashboard becomes accessible.

              Notes
              Modern Docker versions already handle most of the options that the override was forcing.
              Removing the override lets Docker run with its correct defaults (including proper cgroup handling).
              This issue may appear after unattended upgrades or manual system updates.

              Hope this helps anyone running into the same issue πŸ‘

              N Offline
              N Offline
              ntnsndr
              wrote last edited by
              #24

              @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.

              1 Reply Last reply
              1
              • V Offline
                V Offline
                Valexico
                wrote last edited by
                #25

                @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

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                0
                • jamesJ Offline
                  jamesJ Offline
                  james
                  Staff
                  wrote last edited by
                  #26

                  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.

                  1 Reply Last reply
                  0
                  • V Offline
                    V Offline
                    Valexico
                    wrote last edited by
                    #27

                    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.

                    1 Reply Last reply
                    1
                    • jamesJ Offline
                      jamesJ Offline
                      james
                      Staff
                      wrote last edited by
                      #28

                      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.

                      1 Reply Last reply
                      0
                      • J Offline
                        J Offline
                        joseph
                        Staff
                        wrote last edited by
                        #29

                        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 .

                        V 1 Reply Last reply
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                        • J joseph has marked this topic as solved
                        • J 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 .

                          V Offline
                          V Offline
                          Valexico
                          wrote last edited by
                          #30

                          @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 ?

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                          0
                          • J Offline
                            J Offline
                            joseph
                            Staff
                            wrote last edited by
                            #31

                            @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.

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