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Itai Ganot
Asked: 2015-06-30 08:03:18 +0800 CST

Cobbler/TFTP：没有指定文件名或根路径，但为什么呢？

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我安装了一个新的 Cobbler 服务器并将其配置为 DHCP /TFTP 服务器。我已经像这样配置了 /etc/dhcp/dhcpd.conf ：

[root@centolel ~]# cat /etc/dhcp/dhcpd.conf 
ddns-update-style interim;
allow booting;
allow bootp;

ignore client-updates;
set vendorclass = option vendor-class-identifier;
option boot-server code 66 = string;
option option-66 code 66 = text;
option pxe-system-type code 93 = unsigned integer 16;
authorative;
subnet 10.13.0.0 netmask 255.255.255.0 {
     option routers             10.13.0.138;
     option domain-name-servers 10.13.0.1;
     option subnet-mask         255.255.255.0;
     range dynamic-bootp        10.13.0.20 10.13.0.150;
     default-lease-time         3600;
     max-lease-time             3600;
     next-server                10.13.0.1;
     class "pxeclients" {
          match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
          if option pxe-system-type = 00:02 {
                  filename "ia64/elilo.efi";
          } else if option pxe-system-type = 00:06 {
                  filename "grub/grub-x86.efi";
          } else if option pxe-system-type = 00:07 {
                  filename "grub/grub-x86_64.efi";
          } else {
                  filename "pxelinux.0";
          }
     }

}

我创建了一个新的虚拟机并将其配置为从网络启动。

这个想法是 cobbler (dhcp) 将为新创建的虚拟机提供一个 IP 地址，并将发布 CentOS 6 的安装。

当我重新启动新创建的虚拟机时，我看到以下几行：

gPXE 0.9.7 -- Open Source Boot Firmware....
net0: 52:54:00:41:a7:91 on PCI00:03.0 (open)
  [Link:up, TX:0 TXE:0 RX:0 RXE:0]
Waiting for link-up on net0... ok
DHCP (net0 52:54:00:41:a7:91)... ok
net0: 10.13.0.19/255.255.255.0 gw 10.13.0.138
No filename or root path specified
No more network devices

Booting from Hard Disk...
Boot failed: not a bootable disk
.
.
.

如您所见，它接收到的 IP 不包含在“动态引导”范围内……10.13.0.19，而范围从 10.13.0.20 开始。

在重新启动虚拟机后查看/var/log/messagesCobbler 服务器时，我看到：

Jun 29 18:52:07 localhost dhcpd: DHCPDISCOVER from 52:54:00:41:a7:91 via br0
Jun 29 18:52:08 localhost dhcpd: DHCPOFFER on 10.13.0.101 to 52:54:00:41:a7:91 via br0
Jun 29 18:52:08 localhost dhcpd: DHCPDISCOVER from 52:54:00:41:a7:91 via br0
Jun 29 18:52:08 localhost dhcpd: DHCPOFFER on 10.13.0.101 to 52:54:00:41:a7:91 via br0
Jun 29 18:52:10 localhost dhcpd: DHCPREQUEST for 10.13.0.19 (10.13.0.138) from 52:54:00:41:a7:91 via br0: unknown lease 10.13.0.19.
Jun 29 18:52:13 localhost kernel: br0: port 2(vnet0) entering forwarding state

的内容/var/lib/tftpboot：

[root@centolel ~]# ll /var/lib/tftpboot/
total 332
drwxr-xr-x  3 root root   4096 2015-06-29 18:38 boot
drwxr-xr-x  2 root root   4096 2015-06-22 21:08 etc
drwxr-xr-x  2 root root   4096 2015-06-29 18:38 grub
drwxr-xr-x  4 root root   4096 2015-06-29 18:38 images
drwxr-xr-x  2 root root   4096 2015-06-22 21:08 images2
-rw-r--r--. 2 root root  24988 2014-04-15 17:36 memdisk
-rw-r--r--  2 root root  54964 2015-06-14 14:25 menu.c32
drwxr-xr-x  2 root root   4096 2015-06-22 21:08 ppc
-rw-r--r--  2 root root  16794 2015-06-14 14:25 pxelinux.0
drwxr-xr-x  2 root root   4096 2015-06-29 18:43 pxelinux.cfg
drwxr-xr-x  2 root root   4096 2015-06-29 18:38 s390x
-rw-r--r--  2 root root 198236 2015-06-14 14:25 yaboot

运行命令cobbler sync以通知“TASK COMPLETED!!”结束。

所以我想知道为什么服务器专门请求这个不属于范围的地址，我也想知道为什么它找不到图像......有什么想法吗？

centos6.5

1 个回答

  1. Best Answer

    您的网络中可能还有其他一些竞争的 DHCP 服务器。使用 Wireshark 运行流量捕获可以帮助您查明这个问题。

    顺便提一句

    range dynamic-bootp        10.13.0.20 10.13.0.150;
option routers             10.13.0.138;

    路由器的IP在分配范围内；不好。

    • 1

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