linux – dhcp服务器提供“没有免费租约”错误,尽管应该有可用的

我们有一个小型HPC集群,大约有40台机器运行Rocks Linux Distro 6.2(基于Centos 6.6).在过去的几天里,我一直在努力为系统增加6台机器.前3个是成功的,但我不能启动其他3台机器. / var / log / messages显示“no free leases”错误,如下所示：

[root@topaz ~]# tail -n3 /var/log/messages 
Jun 29 17:56:00 topaz dhcpd: DHCPDISCOVER from d0:bf:9c:03:3b:40 via eth0: network 10.1.0.0/16: no free leases
Jun 29 17:56:03 topaz dhcpd: DHCPDISCOVER from d0:bf:9c:03:3b:40 via eth0: network 10.1.0.0/16: no free leases
Jun 29 17:56:07 topaz dhcpd: DHCPDISCOVER from d0:bf:9c:03:3b:40 via eth0: network 10.1.0.0/16: no free leases

除前端外,所有机器只有本地IP.应该有足够的IP可用于分配给这些新机器.似乎没有任何意外的机器连接到网络：

[root@topaz ~]# arp -a | awk '{ print $2 }' | sort   
(10.1.255.215)
(10.1.255.216)
(10.1.255.217)
(10.1.255.218)
(10.1.255.219)
(10.1.255.220)
(10.1.255.221)
(10.1.255.222)
(10.1.255.223)
(10.1.255.224)
(10.1.255.225)
(10.1.255.226)
(10.1.255.227)
(10.1.255.228)
(10.1.255.229)
(10.1.255.230)
(10.1.255.231)
(10.1.255.232)
(10.1.255.233)
(10.1.255.234)
(10.1.255.235)
(10.1.255.236)
(10.1.255.237)
(10.1.255.238)
(10.1.255.239)
(10.1.255.240)
(10.1.255.241)
(10.1.255.242)
(10.1.255.243)
(10.1.255.244)
(10.1.255.245)
(10.1.255.246)
(10.1.255.247)
(10.1.255.248)
(10.1.255.249)
(10.1.255.250)
(10.1.255.251)
(10.1.255.252)
(10.1.255.253)
(10.1.255.254)
(193.140.197.1)
(193.140.197.110)
(193.140.197.160)
(193.140.197.30)
(193.140.197.36)

我们的租约文件不显示任何条目：

[root@topaz ~]# cat /var/lib/dhcpd/dhcpd.leases
# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.1.1-P1

server-duid "000100013706r351x3473213503106";

我们的配置文件如下所示：

[root@topaz ~]# cat /etc/dhcp/dhcpd.conf
ddns-update-style none;
subnet 10.1.0.0 netmask 255.255.0.0 {
        default-lease-time 1200;
        max-lease-time 1200;
        option routers 10.1.1.1;
        option subnet-mask 255.255.0.0;
        option domain-name "local";
        option domain-name-servers 10.1.1.1;
        option broadcast-address 10.1.255.255;
        option interface-mtu 1500;
        group "local" {
                host topaz-eth0 {
                        hardware ethernet 78:E7:D1:E8:19:06;
                        option host-name "topaz";
                        fixed-address 10.1.1.1;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }
                host topaz-eth2 {
                        hardware ethernet 78:E7:D1:E8:19:0A;
                        option host-name "topaz";
                        fixed-address 10.1.1.1;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }
                host topaz-eth3 {
                        hardware ethernet 78:E7:D1:E8:19:0C;
                        option host-name "topaz";
                        fixed-address 10.1.1.1;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }
                host compute-2-0-eth0 {
                        hardware ethernet 00:23:7d:9f:6f:ca;
                        option host-name "compute-2-0";
                        fixed-address 10.1.255.254;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }
                host compute-2-0-eth1 {
                        hardware ethernet 00:23:7d:a0:20:e4;
                        option host-name "compute-2-0";
                        fixed-address 10.1.255.254;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }
                host compute-0-0-eth0 {
                        hardware ethernet 1c:c1:de:76:6f:40;
                        option host-name "compute-0-0";
                        fixed-address 10.1.255.253;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }
                host compute-0-0-eth1 {
                        hardware ethernet 1c:c1:de:76:6f:44;
                        option host-name "compute-0-0";
                        fixed-address 10.1.255.253;
                        filename "pxelinux.0";
                        next-server 10.1.1.1;
                }

                (goes on like this)
}

我不明白为什么我会收到这个错误.任何帮助表示赞赏.