Rocky 9.5 kickstart prompting only for hostname

Rocky Linux Help & Support
1

All I am pulling my hair out trying to get an interactive portion only for the hostname in kickstart. I do not want to hardcode it via a directive and am trying %pre and %post things and they are not working… latest try is

# Pre-installation script to prompt for network settings
%pre --interpreter=/bin/bash
LOGFILE=/tmp/ks-pre.log
exec < /dev/tty6 > /dev/tty6 2> /dev/tty6
chvt 6
echo
echo "###################################"
echo "# Running Pre Setup Configuration #"
echo "###################################"
echo
(
# Predefined DNS servers (replace with actual values)
NAMESERVER="8.8.8.8,1.1.1.1"

# Simple validation function for IP addresses
validate_ip() {
  local ip=$1
  if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
    return 0
  else
    return 1
  fi
}

CONFIRM="no"
while [ "$CONFIRM" != "y" ] && [ "$CONFIRM" != "Y" ]; do
  echo -n "Hostname (or leave blank for DHCP): "
  read HOSTNAME
  if [ -z "$HOSTNAME" ]; then
    HOSTLINE="network --device=eth0 --bootproto=dhcp"
    echo -e -n "\\e[00;31mConfigure OS to use DHCP? (y/n): \\e[00m"
    read CONFIRM
  else
    # Prompt for static IP details
    while true; do
      echo -n "IP Address: "
      read IPADDRESS
      if validate_ip "$IPADDRESS"; then
        break
      else
        echo "Invalid IP address. Please try again."
      fi
    done

    while true; do
      echo -n "Netmask: "
      read NETMASK
      if validate_ip "$NETMASK"; then
        break
      else
        echo "Invalid netmask. Please try again."
      fi
    done

    while true; do
      echo -n "Gateway: "
      read GATEWAY
      if validate_ip "$GATEWAY"; then
        break
      else
        echo "Invalid gateway. Please try again."
      fi
    done

    echo -e "Hostname: \\e[01;36m$HOSTNAME\\e[00m"
    echo -e "IP Address: \\e[01;36m$IPADDRESS\\e[00m"
    echo -e "Netmask: \\e[01;36m$NETMASK\\e[00m"
    echo -e "Gateway: \\e[01;36m$GATEWAY\\e[00m"
    HOSTLINE="network --device=eth0 --bootproto=static --ip=$IPADDRESS --netmask=$NETMASK --gateway=$GATEWAY --nameserver=$NAMESERVER --hostname=$HOSTNAME"
    echo -n "Is the above configuration correct? (y/n): "
    read CONFIRM
  fi
done

# Save the network configuration
echo "$HOSTLINE" > /tmp/network.ks
hostname "$HOSTNAME" 2>/dev/null || true

# Inform user and resume
echo "Network configuration saved. Resuming automated installation..."
sleep 2
) 2>&1 | /usr/bin/tee $LOGFILE

# Switch back to the main installer terminal
chvt 1
exec < /dev/tty1 > /dev/tty1 2> /dev/tty1
%end

# Include the dynamically generated network configuration
%include /tmp/network.ks

# Post-installation script to persist network settings
%post --interpreter=/bin/bash
# Read the HOSTLINE to determine if DHCP or static
HOSTLINE=$(cat /tmp/network.ks)

# Persist hostname
if [[ "$HOSTLINE" =~ --hostname=([^ ]+) ]]; then
  HOSTNAME=${BASH_REMATCH[1]}
  cat > /etc/sysconfig/network <<EOF
NETWORKING=yes
HOSTNAME=$HOSTNAME
EOF
fi

# Persist interface settings
if [[ "$HOSTLINE" =~ --bootproto=dhcp ]]; then
  cat > /etc/sysconfig/network-scripts/ifcfg-eth0 <<EOF
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
EOF
else
  # Extract static IP details from HOSTLINE
  if [[ "$HOSTLINE" =~ --ip=([^ ]+) ]]; then IPADDRESS=${BASH_REMATCH[1]}; fi
  if [[ "$HOSTLINE" =~ --netmask=([^ ]+) ]]; then NETMASK=${BASH_REMATCH[1]}; fi
  if [[ "$HOSTLINE" =~ --gateway=([^ ]+) ]]; then GATEWAY=${BASH_REMATCH[1]}; fi
  if [[ "$HOSTLINE" =~ --nameserver=([^ ]+) ]]; then NAMESERVER=${BASH_REMATCH[1]}; fi

  cat > /etc/sysconfig/network-scripts/ifcfg-eth0 <<EOF
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
IPADDR=$IPADDRESS
NETMASK=$NETMASK
GATEWAY=$GATEWAY
DNS1=${NAMESERVER%%,*}  # Use the first DNS server
EOF
fi
%end

What I am finding is that when you press the first key to input any hostname, it continues the automated install with kickstart…

2

I am looking for any way to get the user experience of just prompting for a hostname only, so if what I have is overkill to get an interactive prompt in an automated install…I am open to suggestions :slight_smile:

3

According to man systemd-hostnamed.service:

The static hostname is stored in /etc/hostname, see hostname(5) for more information.

In principle, you could ask for the string in %post and write to that file?

My hosts do get their (transient) name from DHCP. I practically need static name only on multi-homed hosts.

4

Thank you for the response. Actually, what I posted actually does work with some tweaking. :slight_smile: It works pretty neat, pause automation, allow the interaction and then resumes the unattended build.

image
image1280×800 2.58 KB