Re: Netplan issues

Hello Everyone

A week ago I installed ltsp with the greek schools ppa on a new ubuntu 18.04.2
amd64 server. For the ltsp installation I followed the instructions on the 
ltsp-wiki. I opted out on the installation of epoptes, chose chroot mode, 
DHCPProxy and NBD. 

Now to my problem. I believe the client was working fine, but it stopped 
working the next day (from May 20th to 21st). The client hung on boot with 
several start jobs:
  - waiting for network 
  - configure keyboard layout
  - I forgot about the other two
and throws SQUASHfs errors after some time.

I believe the problem comes from having no network connection when the 
initramfs switches to the real system. I was glad, when I saw that Alkis fixed
an Issue on Saturday (May 25th), which is or is similarly to my Problem. 

First of all the new packages could not be installed without removing ltsp-docs
due to an dependency issue. Was it just me? Then ignore it.

I installed the packages on the server and it looked like the client boots
fine. Later, I also upgraded the client packages in the chroot environment and 
now I am back to the aforementioned issue, but with fewer start jobs. I don't
know if the one time it booted fine was a fluke or is connected to the 
non-updated client image.

The network configuration finishes, but the boot process still hangs on the 
configuration of the keyboard layout.

I am using a VM to boot the client. Here is my lts.config:
[Default]
#LDM_AUTOLOGIN = True
# LDM_USERNAME = <<REDACTED>>
LDM_PASSWORD = <<REDACTED>>
XKBLAYOUT = de
XKBVARIANT = basic
CONSOLE_KEYMAP = de
LOCALDEV = True
SOUND = True
LDM_LIMIT_ONE_SESSION = True
DNS_SERVER = "192.168.123.254"
SEARCH_DOMAIN = <<REDACTED>>
#NETWORK_COMPRESSION = True
NBD_SWAP = False
LDM_DIRECTX = True
LDM_SESSION = "mate-session"

I tried the following different boot
parameters:
NBD:
label ltsp-NBD
menu label LTSP, using NBD
kernel vmlinuz-4.15.0-50-generic
append ro initrd=initrd.img-4.15.0-50-generic init=/sbin/init-ltsp forcepae root=/dev/nbd0
ipappend 3

NFS:
label ltsp-NFS
menu label LTSP, using NFS
kernel vmlinuz-4.15.0-50-generic
append ro initrd=initrd.img-4.15.0-50-generic init=/sbin/init-ltsp forcepae root=/dev/nfs ip=dhcp boot=nfs
ipappend 3

NFS over SQUASHfs (following the instruction of: https://sourceforge.net/p/ltsp/mailman/ltsp-discuss/thread/ffdf8c34-384c-ff56-b61f-82b429e0dd94%40gmail.com/#msg36669125)
label ltsp-NFS
menu label LTSP, using NFS
kernel vmlinuz-4.15.0-50-generic
append ro initrd=initrd.img-4.15.0-50-generic init=/sbin/init-ltsp forcepae root=/dev/nfs nfsroot=/opt/ltsp/images ltsploop=amd64.img
ipappend 3

and NBD to RAM:
label ltsp-NBD
menu label LTSP, using NBD
kernel vmlinuz-4.15.0-50-generic
append ro initrd=initrd.img-4.15.0-50-generic init=/sbin/init-ltsp forcepae root=/dev/nbd0 LTSP_NBD_TO_RAM=true
ipappend 3

Booting with NBD, NFS and SQUASHfs over NFS does not 
change the result, except that NFS hangs after 30 seconds and NBD/SQUASHfs 
over NFS waits forever to finish. Using the option LTSP_NBD_TO_RAM=true with
NBD boots fine. However, this is only an option for my testing VM, since some 
of our machines only have 2gb of RAM. Addionally with this option I am not able
to install applications on the client to try things out before I update the 
image due to space constraints on the root fs.

Lastly I tried configuring netplan in the image. I created following file:
#/etc/netplan/01-network-manager-all.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    match:
      name: enp*
      dhcp4: yes
#    enp0s3:
#      dhcp4: yes

However, this doesn't fix the issue. Any advice or help is appreciated. If all 
fails, maybe someone can tell me how to increase the size of the root fs with 
NBD and LTSP_NBD_TO_RAM, so I can keep testing on the client without always 
building an image. Thank you very much and

Regards
Dominik

On Thu, May 23, 2019 at 2:26 AM Alkis Georgopoulos <alkisg@...> wrote:
>A few schools reported that after
>(1) updating Ubuntu 18.04 and
>(2) running ltsp-update-image,
>some clients hang on boot and show NBD/squashfs errors, waiting for 
>services to get started etc.
>
>This might be due to a recent netplan update:
>https://bugs.launchpad.net/netplan/+bug/1763608
>Read my comment #43 there.
>
>If this happens to you, put this in lts.conf:
>INIT_COMMAND_RM_NETPLAN="rm -f /lib/systemd/system-generators/netplan"
>
>...and reply to this mail, so that I upload a new LTSP to the Greek 
>schools PPA.
>
>
>Cheers,
>Alkis

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