Thank you for the explanation and detailed examples. I now have my system configuration providing the contents of `/etc/resolv.conf` with a service.
However the contents of `/etc/resolv.conf` is still being overwritten with entries for my internet service provider's DNS. After some testing it appears to be happening when I run this command `sudo dhclient <wireless-interface>`. I also appreciate the `hosts-file` example you shared as I am thinking about using `https://github.com/StevenBlack/hosts` as a block list. In this case the contents of `my-host-aliases` would be very large. With Guile how would I have the definition of `my-host-aliases` in it's own file and import and use it in my system configuration? Gary Johnson writes: > When running Guix System, your OS configuration is meant to be fully > derived from evaluating your `operating-system` definition. This > means, in particular, that you should not manually edit any files > outside of your home directories (i.e., /root and /home/*). This > includes, of course, any files under /etc. > > Instead, any custom changes that you want to see under /etc need to be > included in your `operating-system` definition. The way to do this > depends on the change you want to make. > > For example, if you want to edit /etc/sudoers, you should include this > field in your `operating-system` definition (on the same level as > `packages`, `services`, and so on): > > (sudoers-file (plain-file "sudoers" my-sudoers)) > > Then remember to define `my-sudoers` somewhere above the > `operating-system` form. Here's an example: > > (define my-sudoers > "root ALL=(ALL) ALL > %wheel ALL=(ALL) ALL > ") > > Similarly, if you want to modify /etc/hosts, you add this to > `operating-system`: > > (hosts-file (plain-file "hosts" > (string-append (local-host-aliases host-name) > my-host-aliases))) > > And again define my-host-aliases somewhere above `operating-system`: > > (define my-host-aliases > " > # Some Servers > 123.123.123.100 foo > 123.123.123.101 bar > 123.123.123.102 baz > ") > > Most other files under /etc are managed by different services. You > should review the "Guix Services" section of the info pages to find > the appropriate service for whatever files you want to modify. > > As of today, I'm not aware of a Guix service that modifies > /etc/resolv.conf other than the network-manager-service-type (which is > what I use on my system). > > However, if you are not using NetworkManager and want to manually set > the values in /etc/resolv.conf such that they persist across calls to > `guix system reconfigure`, you should add this form to the `services` > list in your `operating-system` definition: > > (simple-service 'resolv-service > etc-service-type > `(("resolv.conf" ,(plain-file "resolv.conf" my-resolv.conf)))) > > And finally remember to define `my-resolv.conf` above `operating-system`: > > (define my-resolv.conf > "# Generated by Guix! > nameserver 255.255.255.1 > nameserver ffff:ffff:ffff::1 > ")
