使用 PXE 進行 DHCP 故障轉移

Question

經過多次實驗，我找到了答案：事實證明，池中存取控制語句的順序很重要。

這是我原來的帖子中的類別定義的重複：

class "dhcp" {
      match if exists dhcp-message-type;
}
class "pxe" {
      match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
}

以下是subnet適用於我的主 DHCP 伺服器的定義。這與我原來的帖子中的配置之間的主要區別在於，與任何or語句range相比，語句的順序，以及我首先定義池。原來的故障轉移線保持不變。allowdeny"pxe"

subnet 10.4.0.0 netmask 255.255.0.0 {
    default-lease-time 86400; # one day (in seconds)
    option subnet-mask 255.255.0.0;
    option broadcast-address 10.4.255.255;
    option routers 10.4.0.1;
    option domain-name-servers 10.4.7.7, 10.4.7.29; 
    option domain-name "company.example.com";
    option time-offset -18000; # Eastern Standard Time
    option ntp-servers 10.4.7.105, 10.4.7.7, 10.4.7.29;
    next-server 10.4.7.9;    # On which system the bootp filename is located.

    if substring (option vendor-class-identifier, 0, 9) = "PXEClient" {
        if option architecture-type =  00:07 {
           filename "uefi/grubx64.efi"; # The file to load for EFI systems.
        }
        else {
           filename "pxelinux/pxelinux.0"; # The file to load via bootp for BIOS systems.
        }
    }

    # A separate pool for PXE services.
    pool {
         range dynamic-bootp 10.4.45.251 10.4.45.255; # DHCP pool on private network
         allow dynamic bootp clients;
         allow members of "pxe";
    }

    # The "regular" DHCP pool.
    pool {
         failover peer "dhcp-failover";
         range 10.4.45.1 10.4.45.250; # DHCP pool on private network
         deny dynamic bootp clients;
         deny members of "pxe";
    }
}

以下是我的輔助 DHCP 伺服器設定中的修訂subnet行，儘管這些變更可能並不重要：

subnet 10.4.0.0 netmask 255.255.0.0 {
    default-lease-time 86400; # one day (in seconds)
    option subnet-mask 255.255.0.0;
    option broadcast-address 10.4.255.255;
    option routers 10.4.0.1;
    option domain-name-servers 10.4.7.7, 10.4.7.29; 
    option domain-name "company.example.com";
    option time-offset -18000; # Eastern Standard Time
    option ntp-servers 10.4.7.105, 10.4.7.7, 10.4.7.29;

    # Note that there are a few IP addresses in the range of the primary
    # server that are not included here. This is for PXE, which is
    # not handled by the secondary server.
    pool {
         failover peer "dhcp-failover";
         deny dynamic bootp clients;     
         range 10.4.45.1 10.4.45.250; # DCHP pool on private network
    }
}

我現在已經有了 DHCP 故障轉移和 PXE 啟動的設置，用於安裝/修復作業系統，可容納 BIOS 和 EFI 系統。我希望其他人發現以上幾行很有用！

Answer 1