This article is for trouble shooting on the Linux iPXE server setup via our manual. If you have used a different manual or setup some of the trouble shoot guidance might not be helpful. If you still encounter issues after below steps, email our support team at support@global-emea.com or create a ticket via this support page. In case you've used a different setup, please explain what you've done and/or share that manual. 


If the DHCP service does not start and gives the error:


O isc-dhcp-server.service - ISC DHCP IPv4 server

     Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)

     Active: failed (Result: exit-code) since Wed 2021-06-16 14:53:05 CEST; 59min ago

       Docs: man:dhcpd(8)

    Process: 1637 ExecStart=/bin/sh -ec      CONFIG_FILE=/etc/dhcp/dhcpd.conf;      if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf; fi;>

   Main PID: 1637 (code=exited, status=1/FAILURE)


jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: 
jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: If you think you have received this message due to a bug rather

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: than a configuration issue please read the section on submitting

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: bugs on either our web page at www.isc.org or in the README file

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: before submitting a bug.  These pages explain the proper

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: process and the information we find helpful for debugging.

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: 

jun 16 14:53:05 wd-Latitude-E6530 dhcpd[1637]: exiting.

jun 16 14:53:05 wd-Latitude-E6530 systemd[1]: isc-dhcp-server.service: Main process exited, code=exited, status=1/FAILURE

jun 16 14:53:05 wd-Latitude-E6530 systemd[1]: isc-dhcp-server.service: Failed with result 'exit-code'.


Main error line: isc-dhcp-server.service: Failed with result 'exit-code'. 


The service must be restarted. The normal one, shown below, might not work; 

$ sudo systemctl restart isc-dhcp-server

Therefor we recommend this one, to gain root access first.: 

$ sudo su

Then, to get the DHCP service restarted:

$ systemctl restart isc-dhcp-server.service
Type below to see the status:
$ systemctl status isc-dhcp-server.service
Now the feedback should be green (See below) with active (running). 


● isc-dhcp-server.service - ISC DHCP IPv4 server

     Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)

     Active: active (running) since Wed 2021-11-17 13:24:02 GMT; 3s ago

       Docs: man:dhcpd(8)

   Main PID: 9966 (dhcpd)

      Tasks: 4 (limit: 18668)

     Memory: 4.4M

     CGroup: /system.slice/isc-dhcp-server.service


If it is still not working, some trouble shooting has to be done. Let's first see if you have an IP address shown on the port that is used for DHCP. In this expample we do use eno1 but this might be different for you, examples are enpos31f6, eth1, eth0, eno1, eno2, enp1s0, enp4s0f0. There are many more options. 


First type ifconfig and see if the NIC has an IP adrress. See here the example. 

eno1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        ether xx:xx:xx:xx:xx:xx  txqueuelen 1000  (Ethernet)

        RX packets 569  bytes 136549 (136.5 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 1712  bytes 324559 (324.5 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

        device interrupt 16  memory 0xec200000-ec220000


Above does not give any IP meaning there is no static IP. So let's force an IP: 

$ ifconfig eno1 10.10.10.1

Note: This will force eno1 to use 10.0.10.1 as a static IP, which we need for this setup. If you use a different range, please use that static IP for this server. Also the port name might be different for you


If you now type ifconfig again it should show the IP here:


eno1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        inet 10.10.10.1  netmask 255.0.0.0  broadcast 10.255.255.255

        ether xx:xx:xx:xx:xx:xx  txqueuelen 1000  (Ethernet)

        RX packets 569  bytes 136549 (136.5 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 1712  bytes 324559 (324.5 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

        device interrupt 16  memory 0xec200000-ec220000


Now restart the services:

netplan apply 
apt update -y && apt install -y iptables-persistent
iptables-save > /etc/iptables/rules.v4
systemctl restart isc-dhcp-server.service
systemctl status isc-dhcp-server.service

The outcome of above should result in to below: 


● isc-dhcp-server.service - ISC DHCP IPv4 server

     Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)

     Active: active (running) since Wed 2021-11-17 13:24:02 GMT; 3s ago

       Docs: man:dhcpd(8)

   Main PID: 9966 (dhcpd)

      Tasks: 4 (limit: 18668)

     Memory: 4.4M

     CGroup: /system.slice/isc-dhcp-server.service


In case this is still not working type below and take a picture of the screen.

type:   journalctl _PID=[PID_ID]  above has 9966 as ID:  Main PID: 9966 (dhcpd)


Like: 

 journalctl _PID=9966


This will show some red text, this will guide you why this is happening. Send this to our support team to be reviewed. 


If this article was not helpful and more help is needed please contact us via one of below option. 

 

 |   Email us   |   Submit a ticket   |   Give us a call    |

 

Our official support hours are 8:00 am to 16:30 pm, after those hours emailing us or submitting a ticket would be the best option. 

 

When contacting our support team, please refer to the article you’ve checked and if possible add a picture of the error and add information on the hardware that’s giving the error. Make always sure you’re using the latest version.