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donjames
Apprentice
Joined: 19 Dec 2004
Posts: 251
Location: 32°9'50" N 94°50'54" W
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 Posted: Thu Sep 03, 2020 11:33 pm Post subject: Manually edit /etc/resolv.conf |
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Hi,
I have noticed that something in the system automatically resets the /etc/resolv.conf file.
Can someone tell me how to turn off the automatic reset so that I can enter the nameservers of my choice and not have them over written by the system?
I may have found the answer:
Add to the end of /etc/dhcpcd.conf
nohook resolv.conf
Thanks,
Don James
Last edited by donjames on Thu Sep 03, 2020 11:50 pm; edited 1 time in total |
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mike155
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Joined: 17 Sep 2010
Posts: 2434
Location: Frankfurt, Germany
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| Posted: Thu Sep 03, 2020 11:38 pm Post subject: |
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| Do you use DHCP? DHCP clients overwrite /etc/resolv.conf - unless you tell them not to do that. |
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Ionen
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Joined: 06 Dec 2018
Posts: 1275
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| Posted: Thu Sep 03, 2020 11:42 pm Post subject: |
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Some init scripts have support to add wanted nameservers in their configs and then will edit resolv.conf using those. Some other stuff will use things like /etc/resolv.conf.head for merging.. well there's a lot of network management systems / dhcp implementation and it's hard to tell without more info.
Personally I use static entries only (with openrc's newnet) and no dhcp, so resolv.conf never changes and only uses local nameserver (dnsmasq). Not that it means you should do the same. |
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donjames
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Joined: 19 Dec 2004
Posts: 251
Location: 32°9'50" N 94°50'54" W
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| Posted: Fri Sep 04, 2020 2:17 am Post subject: |
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| mike155 wrote: | | Do you use DHCP? DHCP clients overwrite /etc/resolv.conf - unless you tell them not to do that. |
Yes, I use dhcp. |
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Tony0945
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Joined: 25 Jul 2006
Posts: 4147
Location: Illinois, USA
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| Posted: Fri Sep 04, 2020 2:49 am Post subject: |
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/etc/resolv.conf get overwritten, but with the namerservers I want:
| Code: | $ cat /etc/conf.d/net
# copied from central server, DHCP version
#config_eth0="dhcp"
dhcp_eth0="nodns"
config_eth0="192.168.0.104 netmask 255.255.255.0 "
mtu_eth0="1500"
dns_servers="127.0.0.1 192.168.0.102 1.1.1.1 198.192.0.1"
#dns_domain_lo="workgroup"
routes_eth0="default via 192.168.0.1"
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| Code: | $ cat /etc/resolv.conf
# Generated by net-scripts for interface eth0
nameserver 127.0.0.1
nameserver 192.168.0.102
nameserver 1.1.1.1
nameserver 198.192.0.1
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UberLord
Retired Dev
Joined: 18 Sep 2003
Posts: 6799
Location: Blighty
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donjames
Apprentice
Joined: 19 Dec 2004
Posts: 251
Location: 32°9'50" N 94°50'54" W
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| Posted: Fri Sep 04, 2020 8:46 pm Post subject: |
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| UberLord wrote: | Many things try to control /etc/resolv.conf - DHCP, PPP, VPN, etc.
Most well behaved applications do this via resolvconf( .
openresolv is a resolvconf implementation in portage which allows a fine graned control of how updates to this file should be handled.
If don't want resolvconf and just want a never changing file, then just make it immutable and nothing can ever change it. |
Hi,
openresolv is not installed on my system. It is using udev. Should I install openresolv?
Where would resolvconf be located?
donjames |
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UberLord
Retired Dev
Joined: 18 Sep 2003
Posts: 6799
Location: Blighty
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figueroa
l33t
Joined: 14 Aug 2005
Posts: 769
Location: Lower right-hand corner USA
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| Posted: Sat Sep 05, 2020 3:11 am Post subject: |
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If you want to override everything without undoing all those other things and ensure your /etc/resolv.conf doesn't get changed, make it immutable:
| Code: | | chattr +i /etc/resolv.conf |
If and when you need to reverse that, do:
| Code: | | chattr -i /etc/resolv.conf |
_________________
Andy Figueroa
andy@andyfigueroa.net Working with Unix since 1983. |
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