nameserver in /etc/resolv.conf vs /etc/sysconfig/ifcfg-eth0 on Centos 6 / RHEL 6 server
If nameservers are configured with both nameserver entries in /etc/resolv.conf and DNS1/DNS2 entries in /etc/sysconfig/network-scripts/ifcfg-eth0 on a Centos 6 / RHEL 6 server, which one will take precedence? Please help! Thanks in advance!!
centos-6 nameserver rhel-6
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
add a comment |
If nameservers are configured with both nameserver entries in /etc/resolv.conf and DNS1/DNS2 entries in /etc/sysconfig/network-scripts/ifcfg-eth0 on a Centos 6 / RHEL 6 server, which one will take precedence? Please help! Thanks in advance!!
centos-6 nameserver rhel-6
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
add a comment |
If nameservers are configured with both nameserver entries in /etc/resolv.conf and DNS1/DNS2 entries in /etc/sysconfig/network-scripts/ifcfg-eth0 on a Centos 6 / RHEL 6 server, which one will take precedence? Please help! Thanks in advance!!
centos-6 nameserver rhel-6
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
If nameservers are configured with both nameserver entries in /etc/resolv.conf and DNS1/DNS2 entries in /etc/sysconfig/network-scripts/ifcfg-eth0 on a Centos 6 / RHEL 6 server, which one will take precedence? Please help! Thanks in advance!!
centos-6 nameserver rhel-6
centos-6 nameserver rhel-6
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
edited Jan 6 at 15:24
Karunkar Borah
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
asked Jan 6 at 13:42
Karunkar BorahKarunkar Borah
13
13
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
The system uses the info in the /etc/resolv.conf file. However, that file is created from the entry in the sysconfig folder (e.g., at reboot).
answered Jan 6 at 14:00
joatjoat
45629
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
add a comment |
Well i tried it out and found out that /etc/resolv.conf takes presedence over /etc/sysconfig/network-scripts/ifcfg-eth file. You can go through my configuration and a dig output below. I rebooted the system after initially saving this configuration.
[root@KKcentOSVM karunakar]# cat /etc/resolv.conf
; custom entries
search localdomain
nameserver 8.8.8.8
nameserver 4.2.2.2
[root@KKcentOSVM karunakar]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
HWADDR=00:0C:29:E7:72:60
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.186.131
NETMASK=255.255.255.0
GATEWAY=192.168.186.2
NAME=eth1
NM_CONTROLLED=no
ONBOOT=yes
DNS1=8.8.4.4
DNS2=4.2.2.2
PEERDNS=no
[root@KKcentOSVM karunakar]# dig www.google.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.68.rc1.el6_10.1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38527
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 69 IN A 216.58.200.132
;; Query time: 196 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jan 7 20:50:00 2019
;; MSG SIZE rcvd: 48
You can verify from the third last line from the output of
dig www.google.com
which is
;; SERVER: 8.8.8.8#53(8.8.8.8)
that the url was resolved by the nameserver 8.8.8.8 set in /etc/resolv.conf rather than 8.8.4.4 set in /etc/sysconfig/network-scripts/ifcfg-eth1
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "3"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1391162%2fnameserver-in-etc-resolv-conf-vs-etc-sysconfig-ifcfg-eth0-on-centos-6-rhel-6%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The system uses the info in the /etc/resolv.conf file. However, that file is created from the entry in the sysconfig folder (e.g., at reboot).
answered Jan 6 at 14:00
joatjoat
45629
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
add a comment |
The system uses the info in the /etc/resolv.conf file. However, that file is created from the entry in the sysconfig folder (e.g., at reboot).
answered Jan 6 at 14:00
joatjoat
45629
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
add a comment |
The system uses the info in the /etc/resolv.conf file. However, that file is created from the entry in the sysconfig folder (e.g., at reboot).
answered Jan 6 at 14:00
joatjoat
45629
The system uses the info in the /etc/resolv.conf file. However, that file is created from the entry in the sysconfig folder (e.g., at reboot).
answered Jan 6 at 14:00
joatjoat
45629
answered Jan 6 at 14:00
joatjoat
45629
answered Jan 6 at 14:00
joatjoat
45629
answered Jan 6 at 14:00
joatjoat
45629
45629
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
add a comment |
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
Thanks but if I set PEERDNS=no in /etc/sysconfig/ifcfg-eth0 it should not update /etc/resolv.conf. Which DNS server will ultimately be used by the system??
– Karunkar Borah
Jan 6 at 14:39
add a comment |
Well i tried it out and found out that /etc/resolv.conf takes presedence over /etc/sysconfig/network-scripts/ifcfg-eth file. You can go through my configuration and a dig output below. I rebooted the system after initially saving this configuration.
[root@KKcentOSVM karunakar]# cat /etc/resolv.conf
; custom entries
search localdomain
nameserver 8.8.8.8
nameserver 4.2.2.2
[root@KKcentOSVM karunakar]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
HWADDR=00:0C:29:E7:72:60
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.186.131
NETMASK=255.255.255.0
GATEWAY=192.168.186.2
NAME=eth1
NM_CONTROLLED=no
ONBOOT=yes
DNS1=8.8.4.4
DNS2=4.2.2.2
PEERDNS=no
[root@KKcentOSVM karunakar]# dig www.google.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.68.rc1.el6_10.1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38527
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 69 IN A 216.58.200.132
;; Query time: 196 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jan 7 20:50:00 2019
;; MSG SIZE rcvd: 48
You can verify from the third last line from the output of
dig www.google.com
which is
;; SERVER: 8.8.8.8#53(8.8.8.8)
that the url was resolved by the nameserver 8.8.8.8 set in /etc/resolv.conf rather than 8.8.4.4 set in /etc/sysconfig/network-scripts/ifcfg-eth1
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
add a comment |
Well i tried it out and found out that /etc/resolv.conf takes presedence over /etc/sysconfig/network-scripts/ifcfg-eth file. You can go through my configuration and a dig output below. I rebooted the system after initially saving this configuration.
[root@KKcentOSVM karunakar]# cat /etc/resolv.conf
; custom entries
search localdomain
nameserver 8.8.8.8
nameserver 4.2.2.2
[root@KKcentOSVM karunakar]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
HWADDR=00:0C:29:E7:72:60
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.186.131
NETMASK=255.255.255.0
GATEWAY=192.168.186.2
NAME=eth1
NM_CONTROLLED=no
ONBOOT=yes
DNS1=8.8.4.4
DNS2=4.2.2.2
PEERDNS=no
[root@KKcentOSVM karunakar]# dig www.google.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.68.rc1.el6_10.1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38527
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 69 IN A 216.58.200.132
;; Query time: 196 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jan 7 20:50:00 2019
;; MSG SIZE rcvd: 48
You can verify from the third last line from the output of
dig www.google.com
which is
;; SERVER: 8.8.8.8#53(8.8.8.8)
that the url was resolved by the nameserver 8.8.8.8 set in /etc/resolv.conf rather than 8.8.4.4 set in /etc/sysconfig/network-scripts/ifcfg-eth1
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
add a comment |
Well i tried it out and found out that /etc/resolv.conf takes presedence over /etc/sysconfig/network-scripts/ifcfg-eth file. You can go through my configuration and a dig output below. I rebooted the system after initially saving this configuration.
[root@KKcentOSVM karunakar]# cat /etc/resolv.conf
; custom entries
search localdomain
nameserver 8.8.8.8
nameserver 4.2.2.2
[root@KKcentOSVM karunakar]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
HWADDR=00:0C:29:E7:72:60
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.186.131
NETMASK=255.255.255.0
GATEWAY=192.168.186.2
NAME=eth1
NM_CONTROLLED=no
ONBOOT=yes
DNS1=8.8.4.4
DNS2=4.2.2.2
PEERDNS=no
[root@KKcentOSVM karunakar]# dig www.google.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.68.rc1.el6_10.1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38527
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 69 IN A 216.58.200.132
;; Query time: 196 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jan 7 20:50:00 2019
;; MSG SIZE rcvd: 48
You can verify from the third last line from the output of
dig www.google.com
which is
;; SERVER: 8.8.8.8#53(8.8.8.8)
that the url was resolved by the nameserver 8.8.8.8 set in /etc/resolv.conf rather than 8.8.4.4 set in /etc/sysconfig/network-scripts/ifcfg-eth1
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
Well i tried it out and found out that /etc/resolv.conf takes presedence over /etc/sysconfig/network-scripts/ifcfg-eth file. You can go through my configuration and a dig output below. I rebooted the system after initially saving this configuration.
[root@KKcentOSVM karunakar]# cat /etc/resolv.conf
; custom entries
search localdomain
nameserver 8.8.8.8
nameserver 4.2.2.2
[root@KKcentOSVM karunakar]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
HWADDR=00:0C:29:E7:72:60
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.186.131
NETMASK=255.255.255.0
GATEWAY=192.168.186.2
NAME=eth1
NM_CONTROLLED=no
ONBOOT=yes
DNS1=8.8.4.4
DNS2=4.2.2.2
PEERDNS=no
[root@KKcentOSVM karunakar]# dig www.google.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.68.rc1.el6_10.1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38527
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 69 IN A 216.58.200.132
;; Query time: 196 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jan 7 20:50:00 2019
;; MSG SIZE rcvd: 48
You can verify from the third last line from the output of
dig www.google.com
which is
;; SERVER: 8.8.8.8#53(8.8.8.8)
that the url was resolved by the nameserver 8.8.8.8 set in /etc/resolv.conf rather than 8.8.4.4 set in /etc/sysconfig/network-scripts/ifcfg-eth1
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
answered Jan 6 at 15:38
Karunkar BorahKarunkar Borah
13
13
add a comment |
add a comment |
Thanks for contributing an answer to Super User!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1391162%2fnameserver-in-etc-resolv-conf-vs-etc-sysconfig-ifcfg-eth0-on-centos-6-rhel-6%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
