我只对sun / etc / hosts中的主机名/ IP进行了硬编码：
# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.42.1 sun sun.beowulf.iecs 192.168.42.2 mercury mercury.beowulf.iecs
目前,eth0(面向WAN)的IP地址是通过DHCP分配的(sun eth0始终被分配相同的IP;这是大学的工作方式,但我正在将此更改为允许我分配一个静态IP).我在sun上的/etc/resolv.conf是：
; generated by /sbin/dhclient-script search biol.uregina.ca nameserver 142.3.102.202 nameserver 142.3.100.15
当我重新启动时似乎被覆盖了所以我有以下/etc/dnsmasq-resolv.conf
search beowulf.iecs biol.uregina.ca nameserver 127.0.0.1 nameserver 8.8.8.8
并指示dnsmasq使用它而不是/etc/resolv.conf
# Change this line if you want dns to get its upstream servers from # somewhere other that /etc/resolv.conf resolv-file=/etc/dnsmasq-resolv.conf # By default,dnsmasq will send queries to any of the upstream # servers it knows about and tries to favour servers to are known # to be up. Uncommenting this forces dnsmasq to try each query # with each server strictly in the order they appear in # /etc/resolv.conf strict-order
大多数情况下,此设置正常.我遇到的问题(我不确定它是一个主要问题,但是……)是nslookup和dig都无法解析sun和mercury的名称,除非我通知这些命令要查询哪个DNS服务器：
# nslookup sun.beowulf.iecs sun.beowulf.iecs Server: sun.beowulf.iecs Address: 192.168.42.1#53 Name: sun.beowulf.iecs Address: 192.168.42.1 # nslookup sun sun.beowulf.iecs Server: sun.beowulf.iecs Address: 192.168.42.1#53 Name: sun Address: 192.168.42.1 # nslookup sun Server: 142.3.102.202 Address: 142.3.102.202#53 ** server can't find sun: NXDOMAIN # nslookup sun.beowulf.iecs Server: 142.3.102.202 Address: 142.3.102.202#53 ** server can't find sun.beowulf.iecs: NXDOMAIN
# dig @192.168.42.1 mercury.beowulf.iecs ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> @192.168.42.1 mercury.beowulf.iecs ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY,status: NOERROR,id: 65090 ;; flags: qr aa rd ra; QUERY: 1,ANSWER: 1,AUTHORITY: 0,ADDITIONAL: 0 ;; QUESTION SECTION: ;mercury.beowulf.iecs. IN A ;; ANSWER SECTION: mercury.beowulf.iecs. 0 IN A 192.168.42.2 ;; Query time: 0 msec ;; SERVER: 192.168.42.1#53(192.168.42.1) ;; WHEN: Wed Jun 25 12:05:31 2014 ;; MSG SIZE rcvd: 54
当我没有指定要使用的名称服务器时不工作：
# dig mercury.beowulf.iecs ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> mercury.beowulf.iecs ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY,status: NXDOMAIN,id: 29153 ;; flags: qr rd ra; QUERY: 1,ANSWER: 0,AUTHORITY: 1,ADDITIONAL: 0 ;; QUESTION SECTION: ;mercury.beowulf.iecs. IN A ;; AUTHORITY SECTION: . 7988 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2014062500 1800 900 604800 86400 ;; Query time: 0 msec ;; SERVER: 142.3.102.202#53(142.3.102.202) ;; WHEN: Wed Jun 25 12:05:37 2014 ;; MSG SIZE rcvd: 113
在上面的最后一个例子(dig)中,SERVER：142.3.102.202#53(142.3.102.202)是/etc/resolv.conf中的第一个DNS服务器,所以默认情况下sun似乎使用这个名称服务器而不是dnsmasq由于/etc/dnsmasq.conf中的设置,预计它会被使用.
那么,这是一个问题吗？我可以在阳光下晒太阳和水银,用SSH连接太阳水银.
如果这是一个问题(或者即使它不是),有没有办法在其上运行sun和dnsmasq来自动解析私有主机名？
解决方法
如果你想通过你的sun主机上的dnsmasq强制所有dns查询,那么/etc/resolv.conf应该指向dnsmasq,即它应该如下所示：
#/etc/resolv.conf on sun nameserver 127.0.0.1
当您重新启动网络接口eth0编辑/ etc / sysconfig / network-scripts / ifcfg-eth0并添加option PEERDNS = no时,防止该文件被覆盖
在/etc/dnsmasq-resolv.conf中,您尝试将dnsmasq配置为上游名称服务器名称服务器127.0.0.1 …该文件应如下所示：
#/etc/dnsmasq-resolv.conf search beowulf.iecs biol.uregina.ca nameserver 8.8.8.8
如果你想使用谷歌的名称服务器.使用大学名称服务器142.3.102.202& amp;是一个好主意. 142.3.100.15相反,因为只有校园网可以看到某些资源并不罕见.
如果您的水银主机是由DHCP配置的,它应该从dnsmasq获取配置,而/etc/resolv.conf指向192.168.42.1上的dnsmasq名称服务器
