create-centos-7.2-mini-unattended-iso.sh

create-centos-7.2-mini-unattended-iso.sh

# This script create a Centos Minimal Unattended ISO

# This method is based on excellent article http://pyxlmap.net/technology/software/linux/custom-centos-iso
# 
# This script has be tested with CentOS 7.2 (on the orign server) to install CentOS 7.2 (on the target server)
# TODO:
# * test package update to reduce the update task on the target system. The following command downloads all updates :
#   (cd $CENTOS_CUSTOM_PATH/Packages ; yumdownloader $(for i in *; { echo ${i%%-[0-9]*}; } ) )

# Some global settings :
CENTOS_SOURCE_ISO_URL=http://mirror.in2p3.fr/linux/CentOS/7/isos/x86_64/CentOS-7-x86_64-Minimal-1511.iso
CENTOS_CUSTOM_PATH=/data/build
ISO=/data/centos7.iso
ISO_MOUNTPOINT=/mnt

function cleanup()
{
	umount $ISO_MOUNTPOINT
}

cd
test -f "$(basename $CENTOS_SOURCE_ISO_URL)" || curl -O $CENTOS_SOURCE_ISO_URL

yum -y install rsync yum-utils createrepo genisoimage isomd5sum

mount -o loop,ro ~/"$(basename $CENTOS_SOURCE_ISO_URL)" $ISO_MOUNTPOINT

mkdir -p $CENTOS_CUSTOM_PATH
cd $CENTOS_CUSTOM_PATH || { echo "Cannot cd into build directory" ; exit 1 ; }
rm -rf repodata/*
rsync --exclude=TRANS.TBL -av $ISO_MOUNTPOINT/ .

# Step 2 : add additional RPM in repository

cd $CENTOS_CUSTOM_PATH/Packages
#yumdownloader openssh-server openssh libcurl curl grep tzdata ca-certificates
#   (cd $CENTOS_CUSTOM_PATH/Packages ; yumdownloader $(for i in *; { echo ${i%%-[0-9]*}; } ) )

# Step 3

cd $CENTOS_CUSTOM_PATH/repodata
mv ./*minimal-x86_64-comps.xml comps.xml && {
ls | grep -v comps.xml | xargs rm -rf
}

# Step 5

cd $CENTOS_CUSTOM_PATH
discinfo=$(head -1 .discinfo)
#createrepo -u "media://$discinfo" -g repodata/comps.xml $CENTOS_CUSTOM_PATH || { cleanup ; exit 1 ; }
createrepo -g repodata/comps.xml $CENTOS_CUSTOM_PATH || { cleanup ; exit 1 ; }

# Step 6

# Get Keyboard and Timezone for current host
read -r _ _ ZONE _ <<< "$(timedatectl | grep -i 'time zone' | egrep '\w/\w' )"
read -r _ _ LAYOUT <<< "$(localectl |grep -i layout )"


cat > $CENTOS_CUSTOM_PATH/ks.cfg << KSEOF
# Tell anaconda we're doing a fresh install and not an upgrade
install
url --url=http://mirror.centos.org/centos/7.2.1511/os/x86_64/
text
reboot --eject
# Use the cdrom for the package install
cdrom
lang en_US.UTF-8
#keyboard $LAYOUT XXX FIXME
keyboard --vckeymap=fr --xlayouts=fr

skipx
# You'll need a DHCP server on the network for the new install to be reachable via SSH
network --device eth0 --bootproto dhcp --onboot=yes
# Set the root password below !! Remember to change this once the install has completed !!
rootpw --plaintext toor
# Enable iptables, but allow SSH from anywhere
firewall --service=ssh
authconfig --enableshadow --passalgo=sha512
selinux --enforcing
#timezone --utc $ZONE
timezone --utc Europe/Paris
logging --level=debug
# Storage partitioning and formatting is below. We use LVM here.
bootloader --location=mbr --driveorder=sda --append="crashkernel=auto rhgb quiet"
zerombr
clearpart --all --initlabel
part /boot --fstype ext4 --size=250
part pv.2 --size=3000 --grow
volgroup VolGroup00 --pesize=32768 pv.2
logvol / --fstype ext4 --name=LogVol00 --vgname=VolGroup00 --size=1024 --grow
logvol swap --fstype swap --name=LogVol01 --vgname=VolGroup00 --size=256 --grow --maxsize=512
# Defines the repo we created
repo --name="CentOS7" --baseurl=file:///mnt/source --cost=100

# The below line installs the bare minimum WITH docs. If you don't want the docs, coment it out and uncomment the line below it.
%packages --nobase
#%packages --nobase --excludedocs
@core
%end
KSEOF

# Inside the isolinux directory is a file named “isolinux.cfg”. Edit it and add the statement shown below.

sed -i -e '
s,timeout 600,timeout 60,
s,append initrd=initrd.img.*$,append initrd=initrd.img inst.stage2=hd:LABEL=CentOS7 ks=cdrom:/ks.cfg net.ifnames=0 biosdevname=0,' $CENTOS_CUSTOM_PATH/isolinux/isolinux.cfg 


cd $CENTOS_CUSTOM_PATH

mkisofs -r -R -J -T -v -no-emul-boot \
-boot-load-size 4 \
-boot-info-table \
-V "CentOS7" \
-p "YOUR NAME HERE" \
-A "CentOS7" \
-b isolinux/isolinux.bin \
-c isolinux/boot.cat \
-x "lost+found" \
--joliet-long \
-o $ISO .


implantisomd5 $ISO

cleanup

ks.cfg