99热在线精品一区二区三区_国产伦精品一区二区三区女破破_亚洲一区二区三区无码_精品国产欧美日韩另类一区

這篇文章給大家分享的是有關(guān)linux6重啟后resolv中DNS信息會(huì)自動(dòng)修改的示例分析的內(nèi)容。小編覺(jué)得挺實(shí)用的，因此分享給大家做個(gè)參考，一起跟隨小編過(guò)來(lái)看看吧。

創(chuàng)新互聯(lián)長(zhǎng)期為近1000家客戶提供的網(wǎng)站建設(shè)服務(wù)，團(tuán)隊(duì)從業(yè)經(jīng)驗(yàn)10年，關(guān)注不同地域、不同群體，并針對(duì)不同對(duì)象提供差異化的產(chǎn)品和服務(wù)；打造開(kāi)放共贏平臺(tái)，與合作伙伴共同營(yíng)造健康的互聯(lián)網(wǎng)生態(tài)環(huán)境。為尼開(kāi)遠(yuǎn)企業(yè)提供專業(yè)的成都網(wǎng)站制作、網(wǎng)站設(shè)計(jì)，尼開(kāi)遠(yuǎn)網(wǎng)站改版等技術(shù)服務(wù)。擁有十多年豐富建站經(jīng)驗(yàn)和眾多成功案例,為您定制開(kāi)發(fā)。

linux 6的/etc/resolv.conf重啟后修改的原因，是因?yàn)橹貑r(shí)如果NetworkManager服務(wù)自動(dòng)啟動(dòng)則該服務(wù)會(huì)讀取網(wǎng)卡信息中的NM_CONTROLLED和DNS配置，如果網(wǎng)卡中配置了NM_CONTROLLED=yes，如果網(wǎng)卡中配置了DNS則把網(wǎng)卡中的DNS寫(xiě)入到resolv.conf，如果網(wǎng)卡沒(méi)有配置DNS則把空的DNS信息寫(xiě)入resolv.conf

如果不希望重啟時(shí)/etc/resolv.conf被修改，則關(guān)閉NetworkManager服務(wù)service NetworkManager stop 
chkconfig --level 0123456 NetworkManager off
并修改網(wǎng)卡NM_CONTROLLED=no


也就是說(shuō)重啟時(shí)，如果有Network Manager服務(wù)，且網(wǎng)卡配置了Network Manager服務(wù)，則該服務(wù)會(huì)根據(jù)網(wǎng)卡的DNS修改/etc/resolv.conf

而網(wǎng)卡中DNS配置，不需要每個(gè)有IP的網(wǎng)卡都配置，只要其中一個(gè)配置了DNS就可以，因?yàn)镈NS是共享的，但是DNS必須配置在有IP的網(wǎng)卡上，如果有很多個(gè)網(wǎng)卡但是沒(méi)有IP，就算這些網(wǎng)卡配置了DNS，則重啟后/etc/resolv.conf也不會(huì)獲取這個(gè)DNS




故障現(xiàn)象1，/etc/resolv.conf里面設(shè)置的nameserver信息丟失了
[root@bsdb ~]# cat /etc/resolv.conf
# Generated by NetworkManager
# No nameservers found; try putting DNS servers into your
# ifcfg files in /etc/sysconfig/network-scripts like so:
#
# DNS1=xxx.xxx.xxx.xxx
# DNS2=xxx.xxx.xxx.xxx
# DOMAIN=lab.foo.com bar.foo.com

查看文件屬性，發(fā)現(xiàn)文件被修改了
[root@bsdb ~]# ll /etc/resolv.conf
-rw-r--r--. 1 root root 228 6月  19 11:06 /etc/resolv.conf

發(fā)現(xiàn)文件修改時(shí)間和重啟時(shí)間匹配
[root@bsdb ~]# last |grep reboot
reboot   system boot  2.6.32-431.el6.x Tue Jun 19 11:06 - 11:27 (2+00:20)

查看網(wǎng)卡的IP
[root@bsdb ~]# grep IPADDR /etc/sysconfig/network-scripts/ifcfg-eth*
/etc/sysconfig/network-scripts/ifcfg-eth0:IPADDR=192.168.21.16
/etc/sysconfig/network-scripts/ifcfg-eth4:IPADDR=192.167.120.11

查看網(wǎng)卡的DNS信息，沒(méi)有配置DNS
[root@bsdb ~]# grep DNS  /etc/sysconfig/network-scripts/ifcfg-eth*
/etc/sysconfig/network-scripts/ifcfg-eth2:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth3:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth5:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth6:PEERDNS=yes

查看網(wǎng)卡是否啟用了NetworkManager管理，即NM_CONTROLLED=yes
[root@bsdb ~]# grep NM_CONTROLLED /etc/sysconfig/network-scripts/ifcfg-eth*
/etc/sysconfig/network-scripts/ifcfg-eth0:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth2:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth3:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth4:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth5:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth6:NM_CONTROLLED=yes

檢查NetworkManager是否運(yùn)行
[root@bsdb ~]# service NetworkManager status
NetworkManager (pid  6297) 正在運(yùn)行...

OS版本
[oraprod@bsdb ~]$ cat /etc/issue
CentOS release 6.5 (Final)




故障現(xiàn)象2，/etc/resolv.conf里面設(shè)置的nameserver被修改了
[root@lmdb ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.30.50
nameserver 192.168.130.50

查看文件屬性，發(fā)現(xiàn)文件被修改了
[root@lmdb ~]# ll /etc/resolv.conf
-rw-r--r--. 1 root root 81 6月  19 11:04 /etc/resolv.conf

發(fā)現(xiàn)文件修改時(shí)間和重啟時(shí)間匹配
[root@lmdb ~]# last |grep reboot
reboot   system boot  2.6.32-642.el6.x Tue Jun 19 11:04 - 10:09 (1+23:04)

查看網(wǎng)卡的IP
[root@lmdb ~]# grep IPADDR /etc/sysconfig/network-scripts/ifcfg-eth*
/etc/sysconfig/network-scripts/ifcfg-eth0:IPADDR=192.168.148.200
/etc/sysconfig/network-scripts/ifcfg-eth2:IPADDR=192.168.130.200

查看網(wǎng)卡的DNS信息，配置了DNS，且配置DNS的是有IP的網(wǎng)卡之一
[root@lmdb ~]# grep DNS /etc/sysconfig/network-scripts/ifcfg-eth*
/etc/sysconfig/network-scripts/ifcfg-eth0:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth2:DNS1=192.168.30.50
/etc/sysconfig/network-scripts/ifcfg-eth2:DNS2=192.168.130.50
/etc/sysconfig/network-scripts/ifcfg-eth2:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth3:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth4:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth5:PEERDNS=yes
/etc/sysconfig/network-scripts/ifcfg-eth6:PEERDNS=yes

查看網(wǎng)卡是否啟用了NetworkManager管理，即NM_CONTROLLED=yes
[root@lmdb ~]# grep NM_CONTROLLED /etc/sysconfig/network-scripts/ifcfg-eth*
/etc/sysconfig/network-scripts/ifcfg-eth0:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth2:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth3:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth4:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth5:NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth6:NM_CONTROLLED=yes

檢查NetworkManager是否運(yùn)行
[root@lmdb ~]# service NetworkManager status
NetworkManager (pid  3173) 正在運(yùn)行...

OS版本
[root@lmdb ~]# cat /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m

感謝各位的閱讀！關(guān)于“l(fā)inux6重啟后resolv中DNS信息會(huì)自動(dòng)修改的示例分析”這篇文章就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，讓大家可以學(xué)到更多知識(shí)，如果覺(jué)得文章不錯(cuò)，可以把它分享出去讓更多的人看到吧！

新聞標(biāo)題：linux6重啟后resolv中DNS信息會(huì)自動(dòng)修改的示例分析-創(chuàng)新互聯(lián)
當(dāng)前路徑：http://www.ef60e0e.cn/article/ceoedd.html