dhcpd 不具合
dhcp failover の設定をしているのだが secondary 側の dhcpd が落ちてしまい、その結果、クライアントPCは、IPアドレスの取得が出来ないという現象が発生した．
primary 側にて以下のようなログが残っていた．
dhcpd: DHCPDISCOVER from "NIC Addr" via xl0: peer holds all free leases
ログ全体は、こちら．
Aug 17 10:05:44 indy dhcpd: DHCPDISCOVER from xx:xx:xx:1f:8d:ab (4k-noda dell) via xl0: peer holds all free leases Aug 17 10:05:46 indy dhcpd: DHCPDISCOVER from xx:xx:xx:20:a0:e6 (Sizai-ukeire) via xl0: peer holds all free leases Aug 17 10:05:46 indy dhcpd: DHCPDISCOVER from xx:xx:xx:89:33:17 via xl0: peer holds all free leases Aug 17 10:05:47 indy dhcpd: DHCPREQUEST for 192.168.1.160 from xx:xx:xx:34:b9:cb (5k-GX270A) via xl0 Aug 17 10:05:47 indy dhcpd: DHCPACK on 192.168.1.160 to xx:xx:xx:34:b9:cb (5k-GX270A) via xl0 Aug 17 10:05:47 indy dhcpd: DHCPDISCOVER from xx:xx:xx:d6:ec:0f via xl0: peer holds all free leases Aug 17 10:05:47 indy dhcpd: DHCPDISCOVER from xx:xx:xx:d6:ec:0f via xl0: peer holds all free leases
100台近くのPCが、IPアドレスの取得に失敗している．
しょうがないので dhcpd.conf を書き換えて dhcp failover を解除してから primary 側の dhcpd を再起動して運用を再開した．要は、dhcp failover する前の設定に戻したと言うことだ．
dhcp failover を切った dhcpd.conf は、以下の通り．
# /etc/dhcpd.conf authoritative; option domain-name "example.co.jp"; option domain-name-servers a.ns.example.co.jp; option subnet-mask 255.255.255.0; ### wins conf ## use wins server option netbios-name-servers wins.example.co.jp; option netbios-node-type 8; #Hybrid Type ## unuse wins server #option netbios-node-type 1; #No WINS Type (Broadcast) ### wpad conf option wpad code 252 = string; ddns-update-style none; default-lease-time 43200; max-lease-time 86400; ### subnet 192.168.1.0 subnet 192.168.1.0 netmask 255.255.255.0{ range 192.168.1.1 192.168.1.191; option routers gate3.example.co.jp; option broadcast-address 192.168.1.255; option wpad "http://wpad.example.co.jp/proxy.pac"; }
ちなみに、dhcp failover 時の dhcpd.conf はコチラ．
その際、dhcpd.leases を書き換えていないので、以下のような
Aug 17 10:21:56 indy dhcpd: /var/db/dhcpd/dhcpd.leases line 10: unknown failover peer: hoge
という、エラーがでたが無視している．起動時のログ全体は、こちら．
Aug 17 10:21:56 indy dhcpd: Internet Systems Consortium DHCP Server V3.0.4 Aug 17 10:21:56 indy dhcpd: Copyright 2004-2006 Internet Systems Consortium. Aug 17 10:21:56 indy dhcpd: All rights reserved. Aug 17 10:21:56 indy dhcpd: For info, please visit http://www.isc.org/sw/dhcp/ Aug 17 10:21:56 indy dhcpd: /var/db/dhcpd/dhcpd.leases line 10: unknown failover peer: hoge Aug 17 10:21:56 indy dhcpd: failover peer "hoge" Aug 17 10:21:56 indy dhcpd: ^ Aug 17 10:21:56 indy dhcpd: /var/db/dhcpd/dhcpd.leases line 2279: unknown failover peer: hoge Aug 17 10:21:56 indy dhcpd: failover peer "hoge" Aug 17 10:21:56 indy dhcpd: ^ Aug 17 10:21:56 indy dhcpd: /var/db/dhcpd/dhcpd.leases line 2284: unknown failover peer: hoge Aug 17 10:21:56 indy dhcpd: failover peer "hoge" Aug 17 10:21:56 indy dhcpd: ^ Aug 17 10:21:56 indy dhcpd: Wrote 191 leases to leases file. ug 17 10:21:56 indy dhcpd: Listening on BPF/xl0/xx:xx:xx:8a:9d:9f/192.168.1/24 Aug 17 10:21:56 indy dhcpd: Sending on BPF/xl0/xx:xx:xx:8a:9d:9f/192.168.1/24 Aug 17 10:21:56 indy dhcpd: Sending on Socket/fallback/fallback-net
追記
DHCP Failover は使わない方が良いみたい．
