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    HELP Problem DHCP - Ubuntu 18.04

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    • george1421G
      george1421 Moderator @ultralivre
      last edited by

      @ultralivre Sorry I have to answer in english here.

      So you did have 2 dhcp servers on your network. One is FOG and one your main dhcp server? I understand why you have a problem.

      What device is your main dhcp server? Is it windows dhcp or something else?

      We have a solution that you can use without breaking your primary dhcp server. But I need to find out how your network is configured.

      It is ok for you to answer in your native language, I will do the same.

      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

      U 1 Reply Last reply Reply Quote 0
      • U
        ultralivre @george1421
        last edited by

        @george1421 Sim tenho um servidor DHCP principal é um firewall Palo Alto ele tem um cabo para um switch core que distribui a rede e as VLANS para outros switchs, em um destes switchs (Vlan) encontra-se o FOG, que esta agindo como um servidor DHCP também !

        george1421G 1 Reply Last reply Reply Quote 0
        • george1421G
          george1421 Moderator @ultralivre
          last edited by george1421

          @ultralivre Your main dhcp server is a Palo Alto firewall. OK then I have a solution for you. I will have you install dnsmasq on your FOG server. With my configuration dnsmasq will only give pxe boot information. Your main dhcp server gives everything else. When you turn off the FOG server dnsmasq will also turn off and no pxe boot information will be given. The dnsmasq configuration will support both bios and uefi based computers.

          Here are the instructions: https://forums.fogproject.org/topic/12796/installing-dnsmasq-on-your-fog-server

          It takes about 10 minutes to install.

          Understand dnsmasq works on the current VLAN where the FOG server will be connected. If you want the FOG server to give out pxe boot information for other vlans there is a small change needed to your dhcp-relay / helper service that runs on your vlan router.

          Warning: Since you are running ubuntu 18.04 make sure your dnsmasq program is 2.75 or later to make the configuration work.

          Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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          • U
            ultralivre @george1421
            last edited by

            @george1421
            Olá, criei o arquivo conforme você orientou, porém deu erro ao iniciar o dnsmasq !

            fog.jpg

            george1421G 1 Reply Last reply Reply Quote 0
            • george1421G
              george1421 Moderator @ultralivre
              last edited by

              @ultralivre I think maybe you missed step #2 in the tutorial. I did not give the exact command to install dnsmasq because each distro is a little different. You need to run this command to install dnsmasq in ubuntu apt install dnsmasq

              Then run the command dnsmasq -V to get the version of dnsmasq. It must be 2.75 or later

              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

              U 1 Reply Last reply Reply Quote 0
              • U
                ultralivre @george1421
                last edited by

                @george1421

                Desculpe, eu havia rodando o comando “sudo dnsmasq -v” e havia obtido resposta, me equivoquei quanto a instalação.

                Agora deu certo.

                Vou testar aqui !

                george1421G 1 Reply Last reply Reply Quote 0
                • george1421G
                  george1421 Moderator @ultralivre
                  last edited by george1421

                  @ultralivre ok no problem I make a mistake not -V but -v. What version number did it the command make?

                  Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                  • U
                    ultralivre @george1421
                    last edited by

                    @george1421

                    gnuuser@gnuuser:~$ sudo dnsmasq -v
Dnsmasq version 2.79  Copyright (c) 2000-2018 Simon Kelley
Compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth nettlehash DNSSEC loop-detect inotify

This software comes with ABSOLUTELY NO WARRANTY.
Dnsmasq is free software, and you are welcome to redistribute it
under the terms of the GNU General Public License, version 2 or 3.
gnuuser@gnuuser:~$

                    Fiz toda configuração do dnsmasq conforme o seu artigo, reiniciei meu server FOG tudo certo ! vou aguardar mais alguns testes, a principio tudo funcionando 😃

                    Você poderia explicar um pouco mais detalhado o que faz o dnsmasq nesse caso ?

                    Obrigado !

                    george1421G 1 Reply Last reply Reply Quote 0
                    • george1421G
                      george1421 Moderator @ultralivre
                      last edited by george1421

                      @ultralivre How it works, easy and hard to explain.

                      DNSMASQ in this configuration is setup to function as proxydhcp configuration. It will not give out IP address only pxe booting information. If you put a computer with wireshark on same subnet as fog server (to watch the communications). Set the capture filter to port 67 or port 68 or port 4011 You will see what is called the DORA process for dhcp (DISCOVER, OFFER, REQUEST, ACK == DORA)

                      PXE booting computer sends out DISCOVER packet. Every DHCP server that hears the DISCOVER will then send an OFFER. Wireshark will show two offers with dnsmasq is running. One will be from your main dhcp server and second from dnsmasq with dhcp option 60 set. This is a flag for a proxydhcp OFFER. PXE client knows to ask for IP address from real dhcp server then asks proxydhcp (dnsmasq) for pxe boot info after the ACK packet.

                      OK your version of dnsmasq is good. The configuration will support both bios and uefi computers pxe booting.

                      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                      • U
                        ultralivre @george1421
                        last edited by

                        @george1421

                        Boa noite !!

                        Servidor FOG a todo vapor por aqui 😃
                        Uma duvida, Criando uma Vlan roteavel isolada somente para o FOG o servidor PXE irá funcionar?

                        A duvida é por que vao estar em dominios de broadcast diferentes !

                        george1421G 1 Reply Last reply Reply Quote 0
                        • george1421G
                          george1421 Moderator @ultralivre
                          last edited by

                          @ultralivre I’m not sure I understand 100% of what you said. I can tell you that FOG will image correctly on a fully routable network with vlans. For DNSMASQ to work across VLANs, you need to update your subnet router and put the FOG’s IP address as the last server in the dhcp-helper/dhcp-relay service on your router. Then you can image across the subnets.

                          Now there are reasons to turn this option on and reasons to keep fog imaging isolated. You make the settings that work best for your company.

                          Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

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                          • U
                            ultralivre @george1421
                            last edited by

                            @george1421 Boa noite !
                            A aplicação FOG funciona na rede através do protocolo DHCP?
                            cliente vs servidor trocam informações primeiramente com DHCP?

                            Estou tentando procurar a documentação para descobrir como o FOG funciona.

                            Obrigado.

                            george1421G 1 Reply Last reply Reply Quote 0
                            • george1421G
                              george1421 Moderator @ultralivre
                              last edited by

                              @ultralivre FOG doesn’t use or interact with dhcp directly. The PXE booting client computer uses dhcp to get its IP address and the hint how to find the FOG server. This is via dhcp options 66 and 67. The client computer then connects to the fog server using the tftp protocol to download the network boot loader (iPXE). That is where the FOG server firsts connects to the workflow.

                              Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

                              U 1 Reply Last reply Reply Quote 0
                              • U
                                ultralivre @george1421
                                last edited by

                                @george1421

                                Boa tarde,

                                Trocando de assunto !

                                É possível movimentar imagens criadas em diferentes servidores FOG ?

                                george1421G 1 Reply Last reply Reply Quote 0
                                • george1421G
                                  george1421 Moderator @ultralivre
                                  last edited by

                                  @ultralivre Yes its possible.

                                  There are two parts

                                  1. Raw data stored in /images/<image_name> directory
                                  2. Meta data that is stored in the database. You can export this info using the web ui

                                  Move the /images files to your new server
                                  Export the metadata from old server then import into new server all using the web ui.

                                  Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

                                  U 1 Reply Last reply Reply Quote 0
                                  • U
                                    ultralivre @george1421
                                    last edited by

                                    @george1421

                                    Você consegue mostrar o que são estes metadados?

                                    george1421G 1 Reply Last reply Reply Quote 0
                                    • george1421G
                                      george1421 Moderator @ultralivre
                                      last edited by

                                      @ultralivre said in HELP Problem DHCP - Ubuntu 18.04:

                                      Você consegue mostrar o que são estes metadados?

                                      Anything stored in the FOG database. From the web ui you can export and import this metadata.

                                      image_export.png

                                      Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

                                      U 1 Reply Last reply Reply Quote 0
                                      • U
                                        ultralivre @george1421
                                        last edited by

                                        @george1421
                                        Boa noite !

                                        Recentemente recebi uma quantidade grande de equipamentos da Dell optplex 5000 e ao tentar utilizar o servidor FOG recebi a seguinte mensagem:

                                        photo_2022-09-14_21-40-08.jpg

                                        george1421G 1 Reply Last reply Reply Quote 0
                                        • george1421G
                                          george1421 Moderator @ultralivre
                                          last edited by

                                          @ultralivre If you make a new FOG server then be sure to update the FOS Linux kernel to 5.15.x version. FOG Web UI -> FOG Configuration -> Kernel update.

                                          Please help us build the FOG community with everyone involved. It's not just about coding - way more we need people to test things, update documentation and most importantly work on uniting the community of people enjoying and working on FOG!

                                          U 1 Reply Last reply Reply Quote 0
                                          • U
                                            ultralivre @george1421
                                            last edited by

                                            @george1421
                                            Bom dia,
                                            Executei a atualização do kernel, porém fiquei na duvida se: a atualização precisar aparecer no fog?

                                            fog04.png
                                            fog01.png

                                            Como pode ver eu atualizei mas continua aparecendo a versão 4.19.145

                                            Esta certo?

                                            george1421G 1 Reply Last reply Reply Quote 0
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