simple example of firstboot script to generate network config
---
firstboot.debian | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
create mode 100755 firstboot.debian
diff --git a/firstboot.debian b/firstboot.debian
new file mode 100755
index 0000000..8ab4e46
--- /dev/null
+++ b/firstboot.debian
@@ -0,0 +1,119 @@
+#!/bin/bash
+
+cdr2mask ()
+{
+ # Number of args to shift, 255..255, first non-255 byte, zeroes
+ set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) &
255 )) 0 0 0
+ [ $1 -gt 1 ] && shift $1 || shift
+ echo ${1-0}.${2-0}.${3-0}.${4-0}
+}
+
+
+MODULE="qemu_fw_cfg"
+
+if lsmod | grep "$MODULE" &> /dev/null ; then
+ echo "$MODULE is loaded!"
+else
+ echo "$MODULE is not loaded!"
+ insmod /lib/modules/`uname -r`/kernel/drivers/firmware/qemu_fw_cfg.ko
+fi
+
+
+while IFS=": " read -r key value; do
+ case "$key" in
+ '#'*) ;;
+ *)
+ eval "$key=\"$value\""
+ esac
+done < /sys/firmware/qemu_fw_cfg/by_name/opt/Proxmox/raw
+
+
+
+
+if [ ! -z $ipconfig0 ];then
+
+ echo "# This file describes the network interfaces available on your
system" > /etc/network/interfaces
+ echo "# and how to activate them. For more information, see
interfaces(5)." >> /etc/network/interfaces
+ echo " " >> /etc/network/interfaces
+ echo "# The loopback network interface" >> /etc/network/interfaces
+ echo "auto lo" >> /etc/network/interfaces
+ echo "iface lo inet loopback" >> /etc/network/interfaces
+ echo ""
+ echo "# The primary network interface" >> /etc/network/interfaces
+ echo "auto eth0" >> /etc/network/interfaces
+
+
+ while IFS="," read -a values; do
+
+ for key in "${!values[@]}"
+ do
+ while IFS="=" read -r k v; do
+ case "$k" in
+ "ip" )
+ IFS='/'
+ declare -a ip_address=(${v})
+ netmask=$( cdr2mask ${ip_address[1]} )
+ echo "iface eth0 inet static" >> /etc/network/interfaces
+ echo " address $ip_address" >> /etc/network/interfaces
+ echo " netmask $netmask" >> /etc/network/interfaces
+ ;;
+ "gw" )
+ echo " gateway $v" >> /etc/network/interfaces
+ ;;
+ esac
+
+ done <<< ${values[${key}]}
+
+ done
+ done <<< $ipconfig0
+fi
+
+if [ ! -z $searchdomain ];then
+ echo $searchdomain
+ echo "search $searchdomain" > /etc/resolv.conf
+
+fi
+
+if [ ! -z $nameserver ];then
+ echo $nameserver
+ echo "nameserver $nameserver" >> /etc/resolv.conf
+fi
+
+if [ ! -z $sshkey ];then
+ echo $sshkey > /root/.ssh/authorized_keys
+fi
+
+if [ ! -z $name ];then
+ echo $name > /etc/hostname
+ hostnamectl set-hostname $name
+ hostname $name
+ if [ ! -z $searchdomain ];then
+ echo "$name.$searchdomain" >/etc/mailname
+ fi
+fi
+
+
+/etc/init.d/networking restart
+sleep 10
+
+
+#generate ssh keys
+echo ""
+echo "Generating unique host keys for your SSH server..."
+find /etc/ssh -name "ssh_host_*_key*" -exec rm {} \;
+DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical dpkg-reconfigure
openssh-server
+echo ""
+echo "Key generation complete"
+
+
+#update
+
+apt-get update
+apt-get dist-upgrade
+
+#disable firstboot script
+systemctl disable firstboot
+
+echo "*** Configuration complete - reboot the system..."
+reboot
+
--
2.11.0
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