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introduce netwatch-dns

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Christian Hesse 2022-01-02 22:21:20 +01:00
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Manage DNS and DoH servers from netwatch
========================================
[◀ Go back to main README](../README.md)
🛈 This script can not be used on its own but requires the base installation.
See [main README](../README.md) for details.
Description
-----------
This script reads server state from netwatch and manages used DNS and
DoH (DNS over HTTPS) servers.
Requirements and installation
-----------------------------
Just install the script:
$ScriptInstallUpdate netwatch-dns;
Then add a scheduler to run it periodically:
/ system scheduler add interval=1m name=netwatch-dns on-event="/ system script run netwatch-dns;" start-time=startup;
Configuration
-------------
The DNS and DoH servers to be checked have to be added to netwatch with
specific comment:
/ tool netwatch add comment="doh, hostname=cloudflare-dns" host=1.1.1.1;
/ tool netwatch add comment="dns, hostname=google-dns" host=8.8.8.8;
/ tool netwatch add comment="doh, dns, hostname=quad-nine" host=9.9.9.10;
This will configure *cloudflare-dns* for DoH (`https://1.1.1.1/dnsquery`), and
*google-dns* and *quad-nine* for regular DNS (`8.8.8.8,9.9.9.10`) if up.
If *cloudflare-dns* is down the script will fall back to *quad-nine* for DoH.
Giving a specific query url for DoH is possible:
/ tool netwatch add comment="doh, hostname=nextdns, doh-url=https://dns.nextdns.io/dns-query" host=199.247.16.158;
Note that using a name in DoH url may introduce a chicken-and-egg issue!
Sometimes using just one specific (possibly internal) DNS server may be
desired, with fallback in case it fails. This is possible as well:
/ tool netwatch add comment="dns, hostname=pi-hole" host=10.0.0.10;
/ tool netwatch add comment="dns-fallback, hostname=cloudflare-dns" host=1.1.1.1;
Tips & Tricks
-------------
### Use in combination with notifications
Netwatch entries can be created to work with both - this script and
[netwatch-notify](netwatch-notify.md). Just give options for both:
/ tool netwatch add comment="doh, notify, hostname=cloudflare-dns" host=1.1.1.1;
Also this allows to update host address, see option `resolve`.
See also
--------
* [Notify on host up and down](netwatch-notify.md)
---
[◀ Go back to main README](../README.md)
[▲ Go back to top](#top)

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doc/netwatch-notify.md
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@ -116,6 +116,18 @@ link failure this address is not available, so use something reliable but
non-essential. In this example the address `1.0.0.1` is used, the same service
(Cloudflare DNS) is available at `1.1.1.1`.
### Use in combination with DNS and DoH management
Netwatch entries can be created to work with both - this script and
[netwatch-dns](netwatch-dns.md). Just give options for both:
/ tool netwatch add comment="doh, notify, hostname=cloudflare-dns" host=1.1.1.1;
See also
--------
* [Manage DNS and DoH servers from netwatch](netwatch-dns.md)
---
[◀ Go back to main README](../README.md)
[▲ Go back to top](#top)