Public | Automated Build

Last pushed: 2 years ago
Short Description
generic pxe server to be used for my razor server
Full Description

This container is used by spam4kev/razor-server as a PXE/TFTP/DCHP server and is expected to be built using docker-compose.

  • How to Build

Becuase tftp returns traffic over a random ephimeral port after first client connection on port 69, a special network mode using the hosts interface as the containers interface must be used. This can be done using 'docker run --net=host \<other options> \<image name>'.

  • iPXE boot using dnsmasq

    dnsmasq  \
          --dhcp-match=IPXEBOOT,175 \
            # 175 sets a variable to the value before the comma. In this case, the variable is IPXEBOOT
          --dhcp-boot=net:IPXEBOOT,bootstrap.ipxe \
            # This sets dhcp-boot option equal to whatever is after the comma if the variable to the
            # right of the colon is set. Since our previous statement sets IPXEBOOT, the dhcp-boot gets
            # a value of bootstrap.ipxe
          --dhcp-boot=undionly.kpxe \
            # this sets dhcp-boot to what is on the right of the equal sign. This will be applied at first tftpboot
            # because within the undionly.kpxe it says to boot the net option
          --enable-tftp \
        # turns on tftp service in dnsmasq
          --tftp-root=/tftpboot \
        # sets the directory that iPXE clients will pull from. in our scripts, we put bootstrap.ipxe & 
        # undionly.kpxe in /tftpboot on image startup.
          --log-dhcp \
        # help with troubleshooting any problems
          --dhcp-range=10.11.11.1,proxy \
        # when proxy is listed to the right of the comma, the server differs all iPXE clients toe the 
        # ip set before the comma.
          --no-daemon
        # needed so docker container stays running(?)
    
  • troubleshooting

    docker run -ti -p 53:53/udp -p 53:53 -p 67:67 -p 68:68/udp -p 69:69 -p 69:69/udp -p 4011:4011/udp --net=host centos sh
    #on docker host based on https://goldmann.pl/blog/2014/01/21/connecting-docker-containers-on-multiple-hosts/
    sudo sh -c 'echo 1 > /proc/sys/net/ipv4/conf/docker0/arp_accept'
    sudo sh -c 'echo 1 > /proc/sys/net/ipv4/conf/enp0s3/arp_accept'
    #or
    sudo sysctl net.ipv4.conf.enp0s3.proxy_arp=1 
    sudo sysctl net.ipv4.conf.docker0.proxy_arp=1
    sudo sysctl net.ipv4.ip_forward=1
    sudo sysctl net.ipv4.conf.all.forwarding=1    #allowed all interfaces to forward traffic if exposed in dockerfile
    
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spam4kev
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