Post Install Script does not work while deploying ubuntu 16.04 image using FOG.

[Vinay]

Hi Team,

I am getting “Command not found” error while deploying ubuntu 16.04 OS to a new system.
i used the Post install script in fog for ubuntu image deployment.
I followed this link: https://forums.fogproject.org/topic/7740/the-magical-mystical-fog-post-download-script
I am trying to install few applications and settings change for my requirement.
I created fog.sh file and edited with required commands to do the task, added fog.sh file path to fog.postdownload file as per the above article, still the same issue.

[george1421]

First let me say I’ve been working on a newish version of the post you linked, here: https://forums.fogproject.org/topic/11126/using-fog-postinstall-scripts-for-windows-driver-injection-2017-ed

To know where its failing we will need to see your fog.sh script to know where its actually failing. The command not found command simply indicates the command (function) you used is not available in FOS.

[Vinay]

@george1421
Thank you for your reply George.
It is just not taking systemctl and apt-get install commands.
My fog.sh file shows as below:

#!/bin/bash

echo 'Installing required packages'
apt-get update
apt-get dist-upgrade
apt-get -y install samba sssd ntp
DEBIAN_FRONTEND=noninteractive apt-get -y install krb5-user

# krb5.conf
echo 'Configuring Kerberos'
cat << EOF > /etc/krb5.conf
[libdefaults]
	default_realm = xx.xxx.COM
# The following krb5.conf variables are only for MIT Kerberos.
	krb4_config = /etc/krb.conf
	krb4_realms = /etc/krb.realms
	kdc_timesync = 1
	ccache_type = 4
	forwardable = true
	proxiable = true
# The following libdefaults parameters are only for Heimdal Kerberos.
	v4_instance_resolve = false
	v4_name_convert = {
		host = {
			rcmd = host
			ftp = ftp
		}
		plain = {
			something = something-else
		}
	}
	fcc-mit-ticketflags = true
[realms]
	xx.xxx.COM = {
		kdc = xxxxxxx.xx.xxx.COM
		kdc = xxxxxxx.xx.xxx.COM
		admin_server = xxxxxxx.xx.xxxx.COM
	}
[login]
	krb4_convert = true
	krb4_get_tickets = false
EOF

# ntp.conf
echo 'Configuring NTP'
sed -i.orig 's/^server/#server/g' /etc/ntp.conf

cat << EOF >> /etc/ntp.conf
server xxxxxxx.xx.xxxx.com
server xxxxxxx.xx.xxxx.com
EOF

# smb.conf
echo 'Configuring Samba'
cp /etc/samba/smb.conf /etc/samba/smb.conf.orig
cat << EOF > /etc/samba/smb.conf
[global]
   workgroup = xxxx
   client signing = yes
   client use spnego = yes
   kerberos method = secrets and keytab
   realm = xx.xxxx.COM
   security = ads
   server string = %h server (Samba, Ubuntu)
   dns proxy = no
   log file = /var/log/samba/log.%m
   max log size = 1000
   syslog = 0
   panic action = /usr/share/samba/panic-action %d
   server role = standalone server
   passdb backend = tdbsam
   obey pam restrictions = yes
   unix password sync = yes
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
   pam password change = yes
   map to guest = bad user
   usershare allow guests = yes
EOF

# sssd.conf
echo 'Configuring SSSD'
cat << EOF > /etc/sssd/sssd.conf
[sssd]
services = nss, pam, sudo
config_file_version = 2
domains = xx.xxxx.COM
[domain/xx.xxxx.COM]
id_provider = ad
access_provider = ad
cache_credentials = True
override_homedir = /home/%d/%u
default_shell = /bin/bash
EOF

sudo chown root:root /etc/sssd/sssd.conf
sudo chmod 600 /etc/sssd/sssd.conf

# hosts
echo 'Configuring Hosts'
cat << EOF >> /etc/hosts
#xx.xxx.x.xx xxxxx.xx.xxxx.com xxxxxx
#xx.xxx.xx.xx xxxxxx.xx.xxxx.com xxxxxxx
EOF

HOSTNAME=`hostname`
sed -i.orig "s/${HOSTNAME}/${HOSTNAME}.ad.here.com ${HOSTNAME}/g" /etc/hosts

# pam
echo 'Configuring PAM'
sed -i.orig '/session\s*required\s*pam_unix.so/a session required pam_mkhomedir.so skel=/etc/skel/ umask=0077' /etc/pam.d/common-session

# lightdm
echo 'Configuring LightDM'
cat << EOF >> /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
greeter-show-manual-login=true
greeter-hide-users=true
EOF
cat << EOF >> /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
allow-guest=false
EOF

# restart services
echo 'Restarting SMBD'
systemctl restart smbd.service
echo 'Restarting NMBD'
systemctl restart nmbd.service
echo 'Restarting NTP'
systemctl restart ntp.service

# join the domain
echo 'Obtaining Kerberos ticket'
sudo kinit xxxxxx
echo 'Getting info about the obtained ticket'
sudo klist
echo 'Joining to the domain'
sudo net ads join -k

echo 'Restarting SSSD'
systemctl restart sssd.service

. /usr/share/fog/lib/funcs.sh

ERROR:

[Sebastian Roth]

@Vinay The command need to be run in the destination Linux system. Something like this before running your commands.

mkdir -p /mnt/ubuntu
mount /dev/sdaX /mnt/ubuntu
chroot /mnt/ubuntu /bin/bash
...

If you haven’t heard about chroot yet you better start reading…

[george1421]

@vinay said in Post Install Script does not work while deploying ubuntu 16.04 image using FOG.:

. /usr/share/fog/lib/funcs.sh

First of all, thank you for sharing your script it helps greatly with resolving your issue.

The simple thing first. You can remove this line . /usr/share/fog/lib/funcs.sh since you are not using any of the fog built in functions.

Second, your script runs in the context of FOS. FOS is a highly customized version of linux, where target OS commands will not work as you found.

You can probably use the change root command like Sebastian mentioned, but I would be concerned about the operating environment of FOS interfering with ubuntu native commands like apt-get.

I think you should modify your postinstall script to drop this fog.sh script on your target system during imaging. Then configure ubuntu to execute this script via an rc.local startup script entry. Then at the end of your fog.sh script, have it remove the call to fog.sh from rc.local entry once fog.sh runs. That way your script is running within the context of your ubuntu environment.

[Vinay]

@sebastian-roth
Thanks for the heads up.
However, i did add the chroot in the script, still it does not work.
Could you help me with adding this chroot command to my fog.sh script, how i can apply here.

[Sebastian Roth]

@Vinay Please post current script code and error on screen again so we know what we are at.

[Vinay]

@sebastian-roth
Would you help me with the procedure to include chroot in my below mentioned script as i messed it up adding multiple things.?

[Wayne Workman]

@vinay said in Post Install Script does not work while deploying ubuntu 16.04 image using FOG.:

@sebastian-roth
Would you help me with the procedure to include chroot in my below mentioned script as i messed it up adding multiple things.?

I looked over your script. Looks like you’d put the chroot related lines at the start of your script. You should play around with chroot before doing this though. On a linux VM, boot to a live Ubuntu disk or something - then try to chroot from the Ubuntu disk to the local disk. Once you do this a couple times you’ll understand what chroot does and how to work with it. Also you should Google search it (or duckduckgo search it) too. We can’t do all your work for you, we rather show you the way.