等到我在裸机上跑pxe的时候，发现是新旧两种机型混合，主板启动有legacy和uefi两种，woc。

思路其实很简单，dhcp有一些参数支持根据client的类型来match不同的启动文件，只需要导向到不同的启动文件，后面的事情就交给tftp了。uefi的启动文件稍稍有些不同，这里做一些记录。

DHCP

  • /etc/dhcp/dhcpd.conf
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# DHCP Server Configuration file.

option space PXE;
option PXE.mtftp-ip  code 1 = ip-address;
option PXE.mtftp-cport code 2 = unsigned integer 16;
option PXE.mtftp-sport code 3 = unsigned integer 16;
option PXE.mtftp-tmout code 4 = unsigned integer 8;
option PXE.mtftp-delay code 5 = unsigned integer 8;
option arch code 93 = unsigned integer 16; # RFC4578
ddns-update-style interim;
ignore client-updates;
authoritative;
allow booting;
allow bootp;
allow unknown-clients;

# internal subnet for my DHCP Server
subnet 192.168.2.0 netmask 255.255.255.0 {
range 192.168.2.200 192.168.2.255;
default-lease-time 600;
max-lease-time 7200;

# IP of PXE Server
class "pxeclients" {
  match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
  next-server 192.168.2.11;

  if option arch = 00:07 {
    filename "uefi/shim.efi";
  } else {
    filename "pxelinux.0";
  }
}
  • dhcp发放记录在/var/lib/dhcpd/dhcpd.leases

Tftp

  • /var/lib/tftpboot
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# uefi files
grub.cfg  grubx64.efi  initrd.img  vmlinuz shim.efi
  • initrd.img vmlinuz和之前一样，从/mnt/images/pxeboot/下获取。
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cp /mnt/images/pxeboot/initrd.img /x
cp /mnt/images/pxeboot/vmlinuz  /x
cp /mnt/EFI/BOOT/grubx64.efi /x
cp /boot/efi/EFI/centos/shim.efi /x
cp /boot/efi/EFI/centos/grub.cfg /x
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# modified part of grub.cfg

linuxefi uefi/pxeboot/vmlinuz ks="http://192.168.2.11/centos7.cfg" nofb text biosdevname=0 ksdevice=bootif
initrdefi uefi/pxeboot/initrd.img

Kickstart

  • autopart比较方便，自动分区。除非有特殊需求，不然autopart挺好用的。
  • packages使用core就足够了。

Reference