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doc: cookbook: Document a dynamic DNS update mcron job. 

* doc/guix-cookbook.texi (System Configuration)
<Dynamic DNS mcron job>: New subsection.

Reviewed-by: Ludovic Courtès <ludo@gnu.org>
Maxim Cournoyer 2023-07-26 20:35:06 -04:00
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@ -124,9 +124,10 @@ System Configuration
* Customizing the Kernel:: Creating and using a custom Linux kernel on Guix System.
* Guix System Image API:: Customizing images to target specific platforms.
* Using security keys:: How to use security keys with Guix System.
* Dynamic DNS mcron job:: Job to update the IP address behind a DuckDNS host name.
* Connecting to Wireguard VPN:: Connecting to a Wireguard VPN.
* Customizing a Window Manager:: Handle customization of a Window manager on Guix System.
* Running Guix on a Linode Server:: Running Guix on a Linode Server. Running Guix on a Linode Server
* Running Guix on a Linode Server:: Running Guix on a Linode Server. Running Guix on a Linode Server.
* Setting up a bind mount:: Setting up a bind mount in the file-systems definition.
* Getting substitutes from Tor:: Configuring Guix daemon to get substitutes through Tor.
* Setting up NGINX with Lua:: Configuring NGINX web-server to load Lua modules.
@ -1570,9 +1571,10 @@ reference.
* Customizing the Kernel:: Creating and using a custom Linux kernel on Guix System.
* Guix System Image API:: Customizing images to target specific platforms.
* Using security keys:: How to use security keys with Guix System.
* Dynamic DNS mcron job:: Job to update the IP address behind a DuckDNS host name.
* Connecting to Wireguard VPN:: Connecting to a Wireguard VPN.
* Customizing a Window Manager:: Handle customization of a Window manager on Guix System.
* Running Guix on a Linode Server:: Running Guix on a Linode Server. Running Guix on a Linode Server
* Running Guix on a Linode Server:: Running Guix on a Linode Server. Running Guix on a Linode Server.
* Setting up a bind mount:: Setting up a bind mount in the file-systems definition.
* Getting substitutes from Tor:: Configuring Guix daemon to get substitutes through Tor.
* Setting up NGINX with Lua:: Configuring NGINX web-server to load Lua modules.
@ -2132,6 +2134,59 @@ security key'' menu. If it works, congratulations, your security key is
ready to be used with applications supporting two-factor authentication
(2FA).
@node Dynamic DNS mcron job
@section Dynamic DNS mcron job
@cindex dynamic DNS, DDNS
If your @acronym{ISP, Internet Service Provider} only provides dynamic
IP addresses, it can be useful to setup a dynamic @acronym{DNS, Domain
Name System} (also known as @acronym{DDNS, Dynamic DNS}) service to
associate a static host name to a public but dynamic (often changing) IP
address. There are multiple existing services that can be used for
this; in the following mcron job, @url{https://duckdns.org, DuckDNS} is
used. It should also work with other dynamic DNS services that offer a
similar interface to update the IP address, such as
@url{https://freedns.afraid.org/}, with minor adjustments.
The mcron job is provided below, where @var{DOMAIN} should be
substituted for your own domain prefix, and the DuckDNS provided token
associated to @var{DOMAIN} added to the
@file{/etc/duckdns/@var{DOMAIN}.token} file.
@lisp
(define duckdns-job
;; Update personal domain IP every 5 minutes.
#~(job '(next-minute (range 0 60 5))
#$(program-file
"duckdns-update"
(with-extensions (list guile-gnutls) ;required by (web client)
#~(begin
(use-modules (ice-9 textual-ports)
(web client))
(let ((token (string-trim-both
(call-with-input-file "/etc/duckdns/@var{DOMAIN}.token"
get-string-all)))
(query-template (string-append "https://www.duckdns.org/"
"update?domains=@var{DOMAIN}"
"&token=~a&ip=")))
(http-get (format #f query-template token))))))
"duckdns-update"
#:user "nobody"))
@end lisp
The job then needs to be added to the list of mcron jobs for your
system, using something like:
@lisp
(operating-system
(services
(cons* (service mcron-service-type
(mcron-configuration
(jobs (list duckdns-job ...))))
...
%base-services)))
@end lisp
@node Connecting to Wireguard VPN
@section Connecting to Wireguard VPN