branch master updated: services: knot: Default zone-file-refresh to 12h.

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iyzsong pushed a commit to branch master
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The following commit(s) were added to refs/heads/master by this push:
     new 882112b581 services: knot: Default zone-file-refresh to 12h.
882112b581 is described below

commit 882112b581b2e6e7796f34ab0e3eb5cef18c8f18
Author: Felix Lechner <felix.lechner@lease-up.com>
AuthorDate: Mon Feb 13 10:59:43 2023 -0800

    services: knot: Default zone-file-refresh to 12h.
    
    The Knot DNS service in Guix uses two days, or 48 hours, for the SOA
    refresh interval but that is outside the range of RFC 1912, which is
    entitled "Common DNS Operational and Configuration Errors." [1]
    
    Section 2.2 of RFC 1912 recommends a maximum of 12 hours for the SOA
    refresh rate: "You can keep it short (20 mins to 2 hours) if you
    aren't worried about a small increase in bandwidth used, or longer
    (2-12 hours) if your Internet connection is slow or is started on
    demand."
    
    This commit sets the default refresh interval at the nearest value
    recommended by the standard, which is 12 hours.
    
    Due to the widespread adoption of NOTIFY messages between primary and
    secondary DNS servers, the SOA refresh interval has arguably lost some
    importance, but the Guix default should still be in line with the
    standards.
    
    Values outside the recommended range can provoke warning messages from
    services commonly used to find bugs in DNS configurations, such as the
    MX Toolbox Super Tool. [2]
    
    [1] https://datatracker.ietf.org/doc/rfc1912/
    [2] https://mxtoolbox.com/SuperTool.aspx
    
    * gnu/services/dns.scm (<zone-file>)[refresh]: Default to (* 12 3600).
    
    Signed-off-by: 宋文武 <iyzsong@member.fsf.org>
---
 gnu/services/dns.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gnu/services/dns.scm b/gnu/services/dns.scm
index 50753b7ab6..32fb8c0664 100644
--- a/gnu/services/dns.scm
+++ b/gnu/services/dns.scm
@@ -114,7 +114,7 @@
   (serial  zone-file-serial
            (default 1))
   (refresh zone-file-refresh
-           (default (* 2 24 3600)))
+           (default (* 12 3600)))
   (retry   zone-file-retry
            (default (* 15 60)))
   (expiry  zone-file-expiry