thin clients does not get the hostname from dhcp server

Hi,

short summary:
On Ubuntu 18.04 we have installed last ltsp version from greek school 
ppa. We encounter problem that the thin clients does not use the 
hostname which is send to the client via dhcp reply from the dhcp server 
and after that they generate the default hostname (e.g. ltsp203). I 
suppose that the problem is somewhere in the client setup, because I 
verify that the dhcp server sends the hostname info (see the verbose 
description).

verbose description:
The ltsp server is Ubuntu 18.04. We use the chrooted setup.
ltsp-info output:
server information:
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:    18.04
Codename:    bionic

server packages:
un ldm <žådnå>
ii ldm-server 2:2.18.06-1+t201810250641~u
un ltsp-client <žådnå>
rc ltsp-client-core 5.5.10-1build1
ii ltsp-docs 1.2-1
ii ltsp-server 5.18.04+t201809080524~ubunt
ii ltsp-server-standalone 5.18.04+t201809080524~ubunt
un ltsp-utils <žådnå>
ii ltspfs 1.5-2+t201807160629~ubuntu1
un ltspfsd <žådnå>

packages in chroot: /opt/ltsp/amd64
ii ldm 2:2.18.06-1+t201810250641~u
un ldm-themes <žådnå>
ii ldm-ubuntu-theme 2:2.0.47
un ldm-ubuntu-themes <žådnå>
ii ltsp-client 5.18.04+t201809080524~ubunt
ii ltsp-client-core 5.18.04+t201809080524~ubunt
ii ltspfsd 1.5-2+t201807160629~ubuntu1
ii ltspfsd-core 1.5-2+t201807160629~ubuntu1

found: /opt/ltsp/amd64/etc/lts.conf

found: /var/lib/tftpboot/ltsp/amd64/lts.conf

found image: /opt/ltsp/images/amd64.img


The dhcp server is CentOS 7.0 fully updated. DHCP server version:
rpm -qa | grep dhcp
dhcp-common-4.2.5-68.el7.centos.1.x86_64
dhcp-4.2.5-68.el7.centos.1.x86_64
dhcp-libs-4.2.5-68.el7.centos.1.x86_64


When I tracked the dhcp communication between thin client and the server 
with tcpdump I get following output on the dhcp server
root@core ~ # tcpdump -i ens192 -vvv -s 1500 '(port 67 or port 68)'
10:38:25.653222 IP (tos 0x0, ttl 19, id 36755, offset 0, flags [none], 
proto UDP (17), length 576)
     172.25.0.1.bootps > 172.25.32.8.bootps: [udp sum ok] BOOTP/DHCP, 
Request from 00:50:56:91:30:05, length 548, hops 1, xid 0x57913005, secs 
4, Flags [Broadcast] (0x8000)
           Gateway-IP 172.25.0.1
           Client-Ethernet-Address 00:50:56:91:30:05
           Vendor-rfc1048 Extensions
             Magic Cookie 0x63825363
             DHCP-Message Option 53, length 1: Discover
             Parameter-Request Option 55, length 24:
               Subnet-Mask, Time-Zone, Default-Gateway, IEN-Name-Server
               Domain-Name-Server, RL, Hostname, BS
               Domain-Name, SS, RP, EP
               Vendor-Option, Server-ID, Vendor-Class, BF
               Option 128, Option 129, Option 130, Option 131
               Option 132, Option 133, Option 134, Option 135
             MSZ Option 57, length 2: 1260
             GUID Option 97, length 17: 
0.66.17.79.26.92.228.24.68.206.237.229.149.90.201.87.212
             ARCH Option 93, length 2: 0
             NDI Option 94, length 3: 1.2.1
             Vendor-Class Option 60, length 32: 
"PXEClient:Arch:00000:UNDI:002001"
             END Option 255, length 0
             PAD Option 0, length 0, occurs 212
10:38:25.653543 IP (tos 0x0, ttl 64, id 27528, offset 0, flags [DF], 
proto UDP (17), length 375)
     172.25.32.8.bootps > 172.25.0.1.bootps: [bad udp cksum 0x79b0 -> 
0x095a!] BOOTP/DHCP, Reply, length 347, hops 1, xid 0x57913005, secs 4, 
Flags [Broadcast] (0x8000)
           Your-IP 172.25.8.254
           Server-IP 172.25.32.53
           Gateway-IP 172.25.0.1
           Client-Ethernet-Address 00:50:56:91:30:05
           Vendor-rfc1048 Extensions
             Magic Cookie 0x63825363
             DHCP-Message Option 53, length 1: Offer
             Server-ID Option 54, length 4: 172.25.32.8
             Lease-Time Option 51, length 4: 21600
             Subnet-Mask Option 1, length 4: 255.255.240.0
             Default-Gateway Option 3, length 4: 172.25.0.1
             Domain-Name-Server Option 6, length 4: 172.25.32.8
*            Hostname Option 12, length 8: "tctest64"*
             Domain-Name Option 15, length 7: "soma.cz"
             RP Option 17, length 28: "172.25.32.53:/opt/ltsp/amd64"
             BF Option 67, length 22: "/ltsp/amd64/pxelinux.0"
             END Option 255, length 0
10:38:25.834087 IP (tos 0x0, ttl 254, id 28636, offset 0, flags [none], 
proto UDP (17), length 336)
     172.25.128.1.bootps > 172.25.32.8.bootps: [udp sum ok] BOOTP/DHCP, 
Request from 7c:1e:b3:00:86:c4, length 308, hops 1, xid 0xabcd0771, 
Flags [none] (0x0000)
           Gateway-IP 172.25.128.1
           Client-Ethernet-Address 7c:1e:b3:00:86:c4
           Vendor-rfc1048 Extensions
             Magic Cookie 0x63825363
             DHCP-Message Option 53, length 1: Discover
             MSZ Option 57, length 2: 1500
             Parameter-Request Option 55, length 4:
               Subnet-Mask, Default-Gateway, BR, Domain-Name-Server
             END Option 255, length 0
             PAD Option 0, length 0, occurs 54
10:38:27.740723 IP (tos 0x0, ttl 19, id 1, offset 0, flags [none], proto 
UDP (17), length 576)
     172.25.0.1.bootps > 172.25.32.8.bootps: [udp sum ok] BOOTP/DHCP, 
Request from 00:50:56:91:30:05, length 548, hops 1, xid 0x57913005, secs 
4, Flags [Broadcast] (0x8000)
           Gateway-IP 172.25.0.1
           Client-Ethernet-Address 00:50:56:91:30:05
           Vendor-rfc1048 Extensions
             Magic Cookie 0x63825363
             DHCP-Message Option 53, length 1: Request
             Requested-IP Option 50, length 4: 172.25.8.254
             Parameter-Request Option 55, length 24:
               Subnet-Mask, Time-Zone, Default-Gateway, IEN-Name-Server
               Domain-Name-Server, RL, Hostname, BS
               Domain-Name, SS, RP, EP
               Vendor-Option, Server-ID, Vendor-Class, BF
               Option 128, Option 129, Option 130, Option 131
               Option 132, Option 133, Option 134, Option 135
             MSZ Option 57, length 2: 1260
             Server-ID Option 54, length 4: 172.25.32.8
             GUID Option 97, length 17: 
0.66.17.79.26.92.228.24.68.206.237.229.149.90.201.87.212
             ARCH Option 93, length 2: 0
             NDI Option 94, length 3: 1.2.1
             Vendor-Class Option 60, length 32: 
"PXEClient:Arch:00000:UNDI:002001"
             END Option 255, length 0
             PAD Option 0, length 0, occurs 200
10:38:27.740999 IP (tos 0x0, ttl 64, id 28651, offset 0, flags [DF], 
proto UDP (17), length 375)
     172.25.32.8.bootps > 172.25.0.1.bootps: [bad udp cksum 0x79b0 -> 
0x065a!] BOOTP/DHCP, Reply, length 347, hops 1, xid 0x57913005, secs 4, 
Flags [Broadcast] (0x8000)
           Your-IP 172.25.8.254
           Server-IP 172.25.32.53
           Gateway-IP 172.25.0.1
           Client-Ethernet-Address 00:50:56:91:30:05
           Vendor-rfc1048 Extensions
             Magic Cookie 0x63825363
             DHCP-Message Option 53, length 1: ACK
             Server-ID Option 54, length 4: 172.25.32.8
             Lease-Time Option 51, length 4: 21600
             Subnet-Mask Option 1, length 4: 255.255.240.0
             Default-Gateway Option 3, length 4: 172.25.0.1
             Domain-Name-Server Option 6, length 4: 172.25.32.8
*            Hostname Option 12, length 8: "tctest64"*
             Domain-Name Option 15, length 7: "soma.cz"
             RP Option 17, length 28: "172.25.32.53:/opt/ltsp/amd64"
             BF Option 67, length 22: "/ltsp/amd64/pxelinux.0"
             END Option 255, length 0

However, when I log into the booted client, then there is the default 
name (ltsp2302). I try to find the code which sets the hostname in the 
ltsp-client file tree. I found that the hostname is set with files
/usr/share//ltsp/init-ltsp.d/02-initramfs-env and 09-hostname
In the file 02-initramfs-env I have found that the net info is get by 
the code

02-initramfs-env:
for netfile in /run/ltsp/net-*.conf /run/net-*.conf ; do
     if [ -f "$netfile" ]; then
         . "$netfile"
     fi
done

Therefore on the booted client I check the content of mentioned files:
root@ltsp2302:~# ls /run/ltsp/net*conf /run/net-*.conf
ls: cannot access '/run/ltsp/net*conf': No such file or directory
  /run/net-ens160.conf
root@ltsp2302:~# cat /run/net-ens160.conf
DEVICE='ens160'
IPV4ADDR='172.25.8.254'
IPV4BROADCAST=''
IPV4NETMASK='255.255.240.0'
IPV4GATEWAY='172.25.0.1'
IPV4DNS0=''
IPV4DNS1=''
HOSTNAME=''
DNSDOMAIN=''
NISDOMAIN=''
ROOTSERVER='172.25.32.53'
ROOTPATH='/opt/ltsp/amd64'
filename=''
DNS_SERVER=''
SEARCH_DOMAIN=''
NTPSVR=''
TIMESVR=''
TIMEZONE=''
SWAPSVR=''

The HOSTNAME is not set in this file.

Can anybody tell me what is wrong or what to test further?


Have a nice day,

Honza







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