On 13/10/2021 20:06, J Martin Rushton via CentOS wrote:
If you just want to tell NM to clear off and leave your resolv.conf
alone do the following:
I might possibly be able to set up a workaround based on that, but it's
not what I really want. Ideally I want NetworkManager to update
resolv.conf, but only if it actually set up a new connection and/or got
new information. Which is what it seemed to do in the past, but then
something changed...
- Toralf
If you don't want it to touch the contents of the file then remove all
DNSx= parameters from all ifcfg files and add PEERDNS=“no” instead.
Now you are solely responsible for setting the content of
/etc/resolv.conf yourself.
You may also have to edit /etc/NetworkManager/NetworkManager.conf and
add dns=none to the [main] section.
On 13/10/2021 18:24, Toralf Lund wrote:
Hi
Does here anyone know exactly when NetworkManager creates or is
supposed to create /etc/resolv.conf for a network connection? Is
there a way I can control it, or alternatively, is there a good way
to debug the functionality?
I thought that there would simply be an update whenever a connection
was established, and an addresses/network info was received (if using
DHCP), and that the information would pretty much be left alone after
that. However, I've lately found that a new file gets written every
few hours even though there is no connection change (that I can
detect), i.e. the same link is up all along. Does anyone have any
ideas why that might happen? I thought at first that the updates
could be linked to DHCP lease renewal, but on closer inspection, that
does not seem to be the case. I don't see anything in the system log
related to networking at the points where a new file gets written.
I get the above behaviour for my home Wifi net. It seemed to start
after I switched to a new router, but that might be coincidental.
It's a problem for me because I'm also using "commercial" VPN
software (not integrated with NetworkManager) that will create it's
own resolv.conf file; it replaces data e.g. from Network Manager when
VPN is enabled, and restores it on disable. If NetworkManager
"refreshes" the information in the mean time, the DNS config for VPN
is lost, and the link doesn't work as expected...
This is on a CentOS 7 system with all the latest updates.
- Toralf
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