Prepare software packages

  sudo apt update
  apt install isc-dhcp-server
  apt install apache2 tftpd-hpa inetutils-inetd

  wget http://releases.ubuntu.com/xenial/ubuntu-16.04.4-server-amd64.iso
  mount -o loop ubuntu-16.04.4-server-amd64.iso /mnt/cdrom/
  cp -fr /mnt/cdrom/install/netboot/* /var/lib/tftpboot/
  mkdir /var/www/html/xenial-install
  cp -fr /mnt/cdrom/* /var/www/html/xenial-install/

Configure environment

  vim /etc/dhcp/dhcpd.conf
  vim /etc/default/tftpd-hpa 
  vim /etc/inetd.conf
  chmod +w /var/lib/tftpboot/pxelinux.cfg/default
  vim /var/lib/tftpboot/pxelinux.cfg/default

• dhcpd.conf ``` ddns-update-style none; default-lease-time 600; max-lease-time 7200; log-facility local7;

A slightly different configuration for an internal subnet.

subnet 10.207.80.0 netmask 255.255.252.0 { range 10.207.82.135 10.207.82.136; allow booting; allow bootp; next-server 10.207.80.159; filename “pxelinux.0”; } option option-128 code 128 = string; option option-129 code 129 = text;

host vR730 { hardware ethernet 52:54:BE:6b:01:12; fixed-address 10.207.82.135; }

* tftpd-hpa

/etc/default/tftpd-hpa

TFTP_USERNAME=”tftp” TFTP_DIRECTORY=”/var/lib/tftpboot” TFTP_ADDRESS=”:69” TFTP_OPTIONS=”–secure” RUN_DAEMON=”yes” OPTIONS=”-l -s /var/lib/tftpboot”

* inetd.conf

tftp dgram udp wait root /usr/sbin/in.tftpd/usr/sbin/in.tftpd -s /var/lib/tftpboot

* /var/lib/tftpboot/pxelinux.cfg/default

D-I config version 2.0

search path for the c32 support libraries (libcom32, libutil etc.)

path ubuntu-installer/amd64/boot-screens/ include ubuntu-installer/amd64/boot-screens/menu.cfg default ubuntu-installer/amd64/boot-screens/vesamenu.c32 prompt 0 timeout 0

[linux] label linux kernel ubuntu-installer/amd64/linux append ks=http://10.207.80.159/ks.cfg vga=normal initrd=ubuntu-installer/amd64/initrd.gz ramdisk_size=16432 root=/dev/rd/0 rw –

  
* Start DHCP/TFTP/WWW services  

375 systemctl restart tftpd-hpa 376 systemctl status tftpd-hpa

381 systemctl restart isc-dhcp-server 382 systemctl status isc-dhcp-server

Alternative commands

461 /etc/init.d/isc-dhcp-server start 463 /etc/init.d/tftpd-hpa start

### Debugging command

dhcpd -t /etc/dhcp/dhcpd.conf tcpdump -i ens32 > tcpdump.log tail -F /var/log/syslog ```

Error of cannot bind to local IPv4 socket: Address already in use

It seems like the problem is that the tftp port (69) is already in use, when you start the tftp server. This might be due to a new program which was installed/updated recently.

Running the following command will help you figure out which process is using tftp port (69) on your machine:

netstat -lnp | grep 69