Multiple hosts POST_INIT_XX in LTSP.CONF

[Soylor]

I'l llike a command line to be executed for all the PC's with specific hostname.

PC hostnames lab-01 to lab-99 execute a POST_INIT_xx command line.

Can it be achieved using LTSP.CONF and a regular expression?

[alkisg]

Do you mean this?

[lab-??]
POST_INIT_CMD="date >/run/date.txt"

[Soylor]

Yes, but with sections named [pc-01] identifies the section with a pc with the same host name automaticaly?
Do i need and environment variable?

[alkisg]

I don't understand your question. Give an example.

[Soylor]

Ltsp clients get their names from dhcp, as00, as01…bs00,bs01,bs02...
I want that, xx00** hostname pcs execute a command like you suggested but not as01,as02,bs01,bs02,bs03,bs34,bs105...
A section like this could be?

[init/*00]
Commands to execute

Rihgt?

[alkisg]

This should do it:

[*00]
POST_INIT_CMD="date >/run/date.txt"

[Soylor]

I did try

This works for all clients

[clients]
  echo $HOSTNAME
  read -p 'Hi: ' abcd

This does not work for a EXTERNO3 client

[EXTERNO3]
  echo $HOSTNAME
  read -p 'Hi: ' abcd

[alkisg]

Try with the EXTERNO3 mac address instead, [xx:xx:xx:xx:xx:xx].
Also read -p won't work because it's dash, not bash. Use printf "Hi: "; read abcd.

[Soylor]

It works with read -p and with read and MAC ADDRESS mode

[82:F5:6F:C3:6A:41]
  printf "Hi: "; read abcd

But it's done 3 times!!! (screenshot)

[Soylor]

PC hostnames are assigned using DHCP (option host-name "EXTERNO")

Anyway Can it be performed HOSTNAME based? (not using mac address)

Could it be somthing related to #568 ?

[alkisg]

It's normal that it's done multiple times. There's PRE_INITRD_BOTTOM_x, POST_INITRD_BOTTOM_x, PRE_INIT_x, POST_INIT_x etc. That's why you're supposed to use POST_INIT_x=command instead of plain command, to have it executed only once.

Yeah if [HOSTNAME] isn't working, something is wrong, for example maybe you're not using the PPA inside or outside your chroot.

[Soylor]

PPA is added. It was done with:

add-apt-repository ppa:ltsp
apt update
apt upgrade

[HOSTNAME] is not working.

What else can i check to get it working?

[alkisg]

On the client, what is the output of this command?

ltsp --version

[Soylor]

ltsp 23.01-1~ubuntu22.04.1

[alkisg]

Nice. Now try ip a, to see your ethernet name, for example enp2s0, and then run sudo /usr/lib/klibc/bin/ipconfig -n enp2s0, to fake a DHCP request. Upload the output of that command here.

[Soylor]

[alkisg]

OK, DNS appears to be fine. And what's the output of the following command?

cat /proc/cmdline /run/net*.conf

[Soylor]

[alkisg]

Can you upload your whole ltsp.conf?
Maybe you have another match before [hostname].
A hostname can match only one section, it can't match multiple sections.

[Soylor]

This is ltsp.conf

# /bin/sh -n
# LTSP configuration file
# Documentation=man:ltsp.conf(5)

# The special [server] section is evaluated only by the ltsp server
[server]
# Enable NAT on dual NIC servers
# NAT=1
# Provide a full menu name for x86_32.img when `ltsp ipxe` runs
# IPXE_X86_32_IMG="Debian Bullseye"
 OMIT_IMAGE_EXCLUDES="etc/epoptes/server.key"
 NFS_HOME=1

# The special [common] section is evaluated by both the server and ltsp clients
[common]
# Specify an alternative TFTP_DIR
# TFTP_DIR=/var/lib/tftpboot
 PWMERGE_SUR="siatec|alumno"
# In the special [clients] section, parameters for all clients can be defined.
# Most ltsp.conf parameters should be placed here.
[clients]
# Specify an /etc/fstab line for NFS home; note this is insecure
# FSTAB_HOME="server:/home /home nfs defaults,nolock 0 0"
 FSTAB_HOME="172.19.46.11:/home /home nfs defaults,nolock 0 0"
 DNS_SERVER="172.19.46.12 8.8.8.8"
# epoptes, garantizar servicio arrancado
 KEEP_SYSTEM_SERVICES="epoptes"
 IGNORE_EPOPTES=1
 POST_INIT_AD="/etc/init.d/siteleco"
 POST_INIT_AJUSTES="section_ajustes"
 POST_INIT_SIN_CREAR_HOMES="sudo pam-auth-update --remove mkhomedir"
[EXTERNO3]
  printf "EXTERNO3 Hi: " >>/tmp/test
[ajustes]
 sed -i 's/"1"/"0"/' /etc/apt/apt.conf.d/20auto-upgrades
 sed -i 's/Prompt=.*/Prompt=never/' /etc/update-manager/release-upgrades

[alkisg]

It looks good to me, except that /tmp/test will be deleted by systemd-tmpfiles so you won't see it at all.
Better use >>/run/test instead of >>/tmp/test.

When I get some free time, I'll try to reproduce your setup and test.

[Soylor]

I changed path but not changes. (thanks)

[Soylor]

Can i help with trace for getting [hostname] working?

[alkisg]

Make a test with a lowercase hostname, e.g. externo instead of EXTERNO3.
If that doesn't work then yeah send a shell trace.
I tested a few things locally and they all worked for me...

[Soylor]

Tested with an absolutly empty ltsp.conf with only this content:

[externo3]
 printf "EXTERNO3 Hixxx: $HOSTNAME" >> /run/test

and with only

[EXTERNO3]
 printf "XXXEXTERNO3 Hixxx: $HOSTNAME" >> /run/test
 printf "EXTERNO3 Hixxx: $HOSTNAME" >> /run/test

No luck, how can i get a shell trace?

[alkisg]

Did you change the hostname to lowercase in your DNS server?

Unfortunately documenting how to get a shell trace would require more time than I currently have... :)

[Soylor]

I changed it in DHCP server (dhcp server sends hostnames). No DNS is used.

[Soylor]

Got it working with lowercase in dhcpd.conf
LTSP.CONF down not work with UPPERCASE hostnames.

Solved.

Tnakk you