dhcpd不将ddns更新推送到绑定

Question

BIND和DHCPD已经配置，但据我所知，DHCPD甚至没有尝试发送动态DNS更新到BIND。我可以用我配置的DHCPD使用的相同的键手动添加记录。

服务器：

eth0: 10.0.0.1静态(绑定和DHCPD) eth1: DHCPd分配(外部的、不同的子网)

客户端：

eth0:指定的DHCP，与服务器eth0相同的子网

DHCPD Config：

authoritative;
option          domain-name "ops.ss";
option          domain-name-servers testvm1.ops.ss;

ddns-updates        on;
ddns-update-style   interim;

default-lease-time  3600;
max-lease-time      7200;
log-facility        local6;

key DDNS_UPDATE {
    algorithm HMAC-MD5.SIG-ALG.REG.INT;
    secret "manysecrets";
}

zone ops.ss. {
    primary     127.0.0.1;
    key     DDNS_UPDATE;
}

zone 0.0.10.in-addr.arpa. {
    primary     127.0.0.1;
    key     DDNS_UPDATE;
}

subnet 10.0.0.0 netmask 255.255.255.0 {
    range       10.0.0.50 10.0.0.99;
    option      routers 10.0.0.1;
}

绑定Config：

include "/etc/named/ddns.key";

acl trusted {
    10.0.0.0/24;
    127.0.0.0/8;
    localnets;
    localhost;
};

options {
    listen-on port 53 { trusted; };
    directory       "/var/named";
    dump-file       "/var/named/data/cache_dump.db";
        statistics-file     "/var/named/data/named_stats.txt";
        memstatistics-file  "/var/named/data/named_mem_stats.txt";
    allow-query     { trusted; };
    forwarders      { 192.168.1.2; };
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
    channel update_log {
        file "data/bind-updates.log";
        severity debug;
        print-category yes;
        print-severity yes;
        print-time yes;
    };
    category update {
        update_log;
    };
    category update-security {
        update_log;
    };
};

zone "." IN {
    type hint;
    file "named.ca";
};

zone "ops.ss" IN {
    type master;
    file "dynamic/fwd_ops.ss";
    allow-update { key DDNS_UPDATE; };
};

zone "0.0.10.in-addr.arpa." {
    type master;
    file "dynamic/rev_10.0.0.0_24";
    allow-update { key DDNS_UPDATE; };
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

这两个系统都是CentOS 6.4，具有bind和dhcp，来自@更新。

Answer 1

DHCPD没有将更新推送到绑定，因为它不知道要更新什么DNS名称，因为没有定义DDNS主机名。

Answer 2

根据手册页，不需要设置ddns-hostname。

   The ddns-hostname statement

     ddns-hostname name;

     The  name  parameter should be the hostname that will be used in set-
     ting up the client's A and PTR records.  If no ddns-hostname is spec-
     ified  in  scope,  then the server will derive the hostname automati-
     cally, using an algorithm that  varies  for  each  of  the  different
     update methods.

Answer 3

确保dhcp客户端实际上正在发送主机名。在Ubuntu中，dhclient.conf中的以下选项可以做到这一点：

send host-name = gethostname();

乍一看，您指定的配置似乎很好。

这是我的DHCP服务器的设置。我使用RNDC密钥：

subnet 192.168.20.0 netmask 255.255.255.0 {
        range 192.168.20.100 192.168.20.200;
        option subnet-mask 255.255.255.0;
        option routers 192.168.20.1;
        option domain-name-servers 192.168.20.201;
        option domain-name "srv.internal.mycompany.be";
        ddns-domainname "srv.internal.mycompany.be.";
        ddns-rev-domainname "in-addr.arpa.";
}

确保指定了ddns-domainname，以便它知道要更新哪些区域记录。别忘了结尾的“小点”。