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    Linux kernel

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    • S
      Sebastian Roth Moderator
      last edited by Sebastian Roth

      @Maorui2k This is a really hard one to find but I still think we are on a good way to track this down.

      Is it possible to use Ubuntu 16.04 kernel and generate an initrd from it? It’s the best one.

      The bzImage-4.4.0-62-generic you’ve used and tested is the original Ubuntu kernel! This binary I did not compile but just extracted it from an ubuntu package. So we are as close to the Ubuntu CD as possible while still having full FOG functionality.
      Trying something new I just saw that the kernel I extracted from the debian package is not exactly the same as the one found in the Ubuntu server ISO. They are very very similar (compared both with the hexeditor) but there is a minor difference. so let’s try something else again. Here I outline the steps to download and setup the Ubuntu netinstaller. Run the following commands on your FOG server:

      wget http://old-releases.ubuntu.com/releases/16.04.2/ubuntu-16.04.2-server-amd64.iso
      mkdir extract
      cd extract
      7z x ../ubuntu-16.04.2-server-amd64.iso
      sudo cp install/vmlinuz /var/www/fog/service/ipxe
      sudo cp install/initrd.gz /var/www/fog/service/ipxe
      cd ..
      rm -rf ubuntu-16.04.2-server-amd64.iso extract/
      

      Then rename or link those files to bzImage/init.xz so you can PXE boot them as usually. When you get to the installer “Select language” question switch to the second virtual terminal by using the key combination Ctrl+Alt+F2 and press ENTER to open a console. Here you can get another dmesg output and do the reboot/shutdown test again.

      This is as close to the Ubuntu CD as we can get - but PXE booted! Let’s see if this fails to reboot/shutdown as well.

      Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

      Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

      Maorui2kM 1 Reply Last reply Reply Quote 0
      • Maorui2kM
        Maorui2k @Sebastian Roth
        last edited by

        @sebastian-roth It seems here is a misunderstanding, the official Ubuntu 16.04 kernel I tested was not from installation DVD, but from an installed system.

        I tested the kernel+initrd of installation DVD, it’s similar to kernels built by you, say about 50% failed.

        The installed kernel is not same as installation DVD. The installed kernel + initrd-ubuntu.xz has about 75% successful rate in 20 times reboot.

        I tried to PXE boot the installed kernel (/boot/vmlinuz-4.4.0-62-generic) and initrd (/boot/initrd.img-4.4.0-62-generic), but the rootfs failed to mount. I uploaded screen capture screen-capture-rootfs-failed.jpg https://drive.google.com/open?id=0Bx_soHaLoSYETXhEeUVBRVllNVE

        It seems the handler of reboot/shutdown is different in your initrd and Ubuntu initrd. The Ubuntu reboot/shutdown is handled by systemctl. Now I wonder if my reboot/shutdown issue is a kind of system-level issue, both kernel/drivers/utilities have their roles.

        How can I use the initrd of the installed Ubuntu in PXE? I think this may have a good chance to resolve my issue.

        1 Reply Last reply Reply Quote 0
        • S
          Sebastian Roth Moderator
          last edited by

          @Maorui2k said:

          It seems here is a misunderstanding, the official Ubuntu 16.04 kernel I tested was not from installation DVD, but from an installed system.

          Ok, thanks for clarifying this point. So to sum things up: Only the ubuntu kernel booted through grub from disk and FOG kernel 3.17.3 booted via PXE do properly shutdown/reboot. I am sorry to say this but it doesn’t make any sense to me. Could you please re-test the 3.17.3 kernel (PXE booted)?!?!?

          I tried to PXE boot the installed kernel (/boot/vmlinuz-4.4.0-62-generic) and initrd (/boot/initrd.img-4.4.0-62-generic), but the rootfs failed to mount.

          Seems like the Ubuntu initrd does not have the block RAM device driver (CONFIG_BLK_DEV_RAM) included or does not load it on startup.

          It seems the handler of reboot/shutdown is different in your initrd and Ubuntu initrd. The Ubuntu reboot/shutdown is handled by systemctl. Now I wonder if my reboot/shutdown issue is a kind of system-level issue, both kernel/drivers/utilities have their roles.

          Be careful to not mix up the concepts here. Ubuntu only uses the initrd to pre-load kernel drivers before handing over to the system on disk. But the FOG initrd is an entire linux system that boots up over PXE and is loaded to RAM and executed. Sure this is a huge difference! But as you were saying that FOG kernel 3.17.3 is doing fine I somehow assumed that there is a chance we can find the issue.

          How can I use the initrd of the installed Ubuntu in PXE? I think this may have a good chance to resolve my issue.

          I don’t think this would help. Using the installed Ubuntu initrd still does not bootup to a full systemd controlled system. As I said before the Ubuntu initrd is not a full system but only includes a wide range of kernel drivers (most of those don’t get loaded anyway).

          Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

          Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

          1 Reply Last reply Reply Quote 0
          • S
            Sebastian Roth Moderator
            last edited by

            @Maorui2k Did you get to test even more? I am wondering if this is just a crappy piece of hardware and things are going wrong because of that?!?

            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

            Maorui2kM 1 Reply Last reply Reply Quote 0
            • Maorui2kM
              Maorui2k @Sebastian Roth
              last edited by

              @sebastian-roth Sorry, I was out again, the whole week. I retested 3.17.3+PXE 60 times, 2 failed and 58 passed.

              1 Reply Last reply Reply Quote 0
              • S
                Sebastian Roth Moderator
                last edited by

                @Maorui2k Ok, so this kernel is also not perfect. Way better than the 4.x kernels but still not perfect. So we could start bisecting the kernel code starting from 3.17.3 up to the current version but that would take ages doing this the way we did all the other debugging (me compiling a new kernel and uploading, you testing and replying here) and I won’t go through this.

                So which other options do we have? Mind testing the installed Ubuntu system 50-60 times? Does it always work??

                Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                Maorui2kM 1 Reply Last reply Reply Quote 0
                • Maorui2kM
                  Maorui2k @Sebastian Roth
                  last edited by

                  @sebastian-roth Yes, 3.17.3 is not perfect. I did a quick testing and found starting from 4.0 kernel (fog kernel + fog initrd + PXE) the chance of this issue raised to around 50%. I tested the installed Ubuntu 16.04 system 60 times, no any failure. I also retested the latest CentOS 7 which used 3.10 kernal and systemd, but the failure rate was around 50% too.

                  As you said, we already did many compiling and testing, it’s fainful :-D, and got no significant changes. This should not be the right way. The recent testing result strengthened my gut feeling that this is a system level issue. Ubuntu team found and resolved this issue somehow, but CentOS didn’t. Kernel, driver, systemd and some other unknown parts involved in this issue. So I think the best solution should be converting the installed Ubuntu 16 into PXE boot in some way. What’s your suggestion?

                  1 Reply Last reply Reply Quote 0
                  • S
                    Sebastian Roth Moderator
                    last edited by Sebastian Roth

                    @maorui2k said in Linux kernel:

                    So I think the best solution should be converting the installed Ubuntu 16 into PXE boot in some way. What’s your suggestion?

                    Unfortunately I don’t think this is gonna be a proper solution as we have already tried the original Ubuntu 16.04 kernel at least once. Wait, let me read through all this again. Yeah, I remember correctly the bzImage-4.4.0-62-generic and init-ubuntu.xz (download here) are as close to the installed Ubuntu 16.04 as you can get from my point of view. It actually is the very original Ubuntu kernel binary (not one I compiled!) plus a modified FOG initrd as we still want to have the FOG functionality.

                    As well I also suggested you should try PXE booting the original Ubuntu kernel and initrd just to see if this is any better. But I think you never tried this or at least never told us abou the outcome. Please give this a try and see how many times this does a proper reboot/shutdown:

                    wget http://old-releases.ubuntu.com/releases/16.04.2/ubuntu-16.04.2-server-amd64.iso
                    mkdir extract
                    cd extract
                    7z x ../ubuntu-16.04.2-server-amd64.iso
                    sudo cp install/vmlinuz /var/www/fog/service/ipxe
                    sudo cp install/initrd.gz /var/www/fog/service/ipxe
                    

                    Then rename or link those files to bzImage/init.xz so you can PXE boot them as usually. When you get to the installer “Select language” question switch to the second virtual terminal by using the key combination Ctrl+Alt+F2 and press ENTER to open a console. Now do the reboot/shutdown test again.

                    My gut feeling is that you’ll see 50% hangs again although this is so very close to the installed Ubuntu… This crappy CPU/chipset might just trigger the hang if PXE booted which is definitely a little different than booting from disk.

                    Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                    Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                    Maorui2kM 1 Reply Last reply Reply Quote 1
                    • Maorui2kM
                      Maorui2k @Sebastian Roth
                      last edited by

                      @sebastian-roth Oops, I missed the result. I tested the kernel & initrd from ISO in two booting ways - PXE and USB. The results were quiet similar, 36 passed + 14 failed & 34 passed + 16 failed.

                      1 Reply Last reply Reply Quote 0
                      • S
                        Sebastian Roth Moderator
                        last edited by

                        @Maorui2k Ok, than it either seems like…

                        • you have a magic kernel installed on disk (we’ll try that one out in a minute)
                        • or booting from HD is different than PXE and USB
                        • or systemd is playing a role here.

                        For the first idea, this is something we can test. Boot up your installed Ubuntu and copy /boot/vmlinuz-4.4.0-62-generic (or whichever the one is that you boot on that system (find out by uname -a) over to your FOG server. Keep the initrd.gz that you were using from the extracted ISO file last time. See if this makes a difference.

                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                        Maorui2kM 1 Reply Last reply Reply Quote 0
                        • Maorui2kM
                          Maorui2k @Sebastian Roth
                          last edited by

                          @sebastian-roth I tried the 1st option, but the PC hung after the language selection screen showed up, both keyboard & power button were frozen. Didn’t see any error message, so I don’t know if it is realted to HID driver or not, but anyway I cannot do the testing, should be driver missed or conflicted.

                          1 Reply Last reply Reply Quote 0
                          • S
                            Sebastian Roth Moderator
                            last edited by

                            @Maorui2k So which initrd did you use?

                            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                            Maorui2kM 1 Reply Last reply Reply Quote 0
                            • Maorui2kM
                              Maorui2k @Sebastian Roth
                              last edited by

                              @sebastian-roth The one extracted from ISO

                              1 Reply Last reply Reply Quote 0
                              • S
                                Sebastian Roth Moderator
                                last edited by Sebastian Roth

                                @Maorui2k Maybe the kernel version does not match up with the modules version in the initrd? What did you get from uname -r? If you get something different than 4.4.0-62-generic then try this:

                                wget http://old-releases.ubuntu.com/releases/16.04.2/ubuntu-16.04.2-server-amd64.iso
                                mkdir extract
                                cd extract
                                7z x ../ubuntu-16.04.2-server-amd64.iso
                                cd install
                                gunzip initrd.gz
                                mkdir extract
                                cd extract
                                cpio -idv <../initrd
                                mv lib/modules/4.4.0-62-generic/ lib/modules/$(uname -r)/
                                find . -print  | cpio -ov -H newc > ../initrd
                                cd ..
                                gzip initrd
                                

                                You should end up with a newly created initrd.gz file. Copy that to /var/www/fog/service/ipxe/ directory on your FOG server and boot from that!

                                Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                Maorui2kM 1 Reply Last reply Reply Quote 0
                                • Maorui2kM
                                  Maorui2k @Sebastian Roth
                                  last edited by

                                  @sebastian-roth still failed at the same position…

                                  1 Reply Last reply Reply Quote 0
                                  • S
                                    Sebastian Roth Moderator
                                    last edited by

                                    @Maorui2k I think I am out of ideas for now. Sorry to say this. It’s just way to complicated to merge an Ubuntu initrd with ours to make it work as a proper FOG initrd. I definitely won’t go there. Not sure what else you could try. Maybe think about buying new (proper) hardware?

                                    Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                    Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                    Maorui2kM 1 Reply Last reply Reply Quote 1
                                    • Maorui2kM
                                      Maorui2k @Sebastian Roth
                                      last edited by

                                      @sebastian-roth I have no idea too… Changing hardware is not an option, too many PCs… Currently I would keep using fog 1.3.x and kernel 3.17.3, so far it could meet my requirement. Maybe I would try to merge the initrd later. Anyway thank you so much for your support!!! 🙂

                                      1 Reply Last reply Reply Quote 0
                                      • S
                                        Sebastian Roth Moderator
                                        last edited by

                                        @Maorui2k I am not saying it’s impossible to figure out but doing this in the forums one post every couple of days forth and back won’t get us anywhere. If you are really keen to get this solved then send over a machine so I can test and I’ll see what I can do. Just not sure if it’s worth sending it around the world as I am located in Germany.

                                        You could still stick to test different linux distros like all kinds of live linux CDs (system rescue CD, …) as well as installed distros and see which ones work and which have the issue. Maybe you can figure out what they all have in common.

                                        Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

                                        Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

                                        Wayne WorkmanW 1 Reply Last reply Reply Quote 0
                                        • Wayne WorkmanW
                                          Wayne Workman @Sebastian Roth
                                          last edited by Wayne Workman

                                          @sebastian-roth said in Linux kernel:

                                          Just not sure if it’s worth sending it around the world as I am located in Germany.

                                          His org could just buy you one and have it shipped to you. Of course you are deserving of much more than a crap hardware model, Sebastian. 🙂

                                          Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!
                                          Daily Clean Installation Results:
                                          https://fogtesting.fogproject.us/
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                                          https://fog-external-reporting-results.fogproject.us/

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