Move OSMC from sd card to NFS root?

penfold42 · 14 June 2016 12:35

I really don’t want to do a re-install.

I’ve copied the rootfs to an nfs share, setup dhcpd

It starts and hangs at “waiting for network to be configured”

There’s about 4 seconds where it’s ping able so I’m guessing it’s just shot itself in the foot by trying to configure an already up network.

Is it an easy fix ?

Thanks !

Karnage · 14 June 2016 23:17

You need to seriously consider how much work you are willing to put into your solution. Backing up the Kodi stuff, reinstalling, then restoring is probably far more straight-forward and robust method.

sam_nazarko · 15 June 2016 02:54

You don’t need dhcpd.

You need to adjust cmdline.txt and copy the root filesystem to an nfs share. You’ll also want to adjust /etc/fstab. Have a look how it’s done in the installer here:

github.com

osmc/osmc/blob/master/installer/target/qt_target/qt_target_installer/bootloaderconfig.cpp#L93


      
                  /* We don't have an exact name for the DTB image */
                  QDirIterator it ("/mnt/root/boot", QStringList() << "dtb*.img", QDir::Files);
                  QString dtbName;
                  while (it.hasNext())
                  {
                      dtbName = it.next();
                      break;
                  }
                  if (! dtbName.isEmpty())
                  {
                      /* Ensure we have permission to write it out */
                      system("/usr/sbin/fw_setenv upgrade_step 2");
          	    /* Ensure that we reset any environment to match new bootloader */
          	    /* ToDo: fix cuslogo for B2B */
          	    system("/usr/sbin/fw_setenv osmc_defenv true");
                      QString ddCmd = "dd if=" + dtbName + " of=/dev/dtb bs=256k conv=sync";
                      system(ddCmd.toLocal8Bit().data());
                  }
                  /* Upload the bootloader to eMMC */
                  QString bootloaderName;
                  if (utils->is4kplus() == "4kplus") {

penfold42 · 15 June 2016 06:49

Thanks for the pointers.
I should have been clearer - dhcpd was configured on my DHCP server to provide the boot path.

fstab is correct and I’ve just done a diff on an sdcard vs nfs OSMC install - it looks like there’s some systemd differences

sam_nazarko · 15 June 2016 06:51

That doesn’t sound right.

Assume both were both on the same updated version?

Show me your cmdline.txt, which also needs adjusting

penfold42 · 15 June 2016 09:28

They were both May - the NFS install was fresh today and the original has been around for a few months.

This works now:

cat /boot/cmdline.txt
root=/dev/nfs nfsroot=10.0.0.3:/vmfs/NFSPi/lachlanpi ip=dhcp rootwait quiet osmcdev=rbp2

I need to try to retrace my steps to work out why it didnt work yesterday…

penfold42 · 15 June 2016 11:49

Sadly I couldnt replicate my issue.

On a related topic, I’d like to specify the nfsroot using dhcp rather than the cmdline.txt

https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=145971
implies this should work with:
option root-path “10.0.0.3:/vmfs/NFSPi/lachlanpi,tcp,vers=3”;

unfortunately osmc hangs at initrd

sam_nazarko · 15 June 2016 12:40

That’s not implemented in initramfs.

If you want to improve it, look for osmc/init at master · osmc/osmc · GitHub. Unfortunately it’s quite a niche feature request so I will not have much time to look at this.

Sam

penfold42 · 15 June 2016 13:06

thanks sam!

ill look into it

Btw, I think I know what accused the issue. I think o used a raspbian /boot partition rather than an OSMC boot partition.