NETCONF is the standard for installing, manipulating and deleting configuration of network devices while YANG is used to model both configuration and state data of network elements.
`netconfd` - YANG-based NETCONF-over-SSH server
https://manpages.debian.org/bullseye/netconfd/netconfd.1.en.html
YANG is most likely required to write vendor-specific modules
https://github.com/YangModels/yang
Additional links:
Netopeer2 is a server for implementing network configuration management based on the NETCONF Protocol.
https://github.com/CESNET/netopeer2
https://hub.docker.com/r/sysrepo/sysrepo-netopeer2
https://www.sysrepo.org/
RFC 6020 https://datatracker.ietf.org/doc/html/rfc6020
```
podman run -it --rm -p 830:830 --name netopeer --net host docker.io/sysrepo/sysrepo-netopeer2
root@r11-roll:/home/vyos# ssh netconf@localhost -p 830 -s netconf
Interactive SSH Authentication
Type your password:
Password:
<hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><capabilities><capability>urn:ietf:params:netconf:base:1.0</capability><capability>urn:ietf:params:netconf:base:1.1</capability><capability>urn:ietf:params:netconf:capability:writable-running:1.0</capability><capability>urn:ietf:params:netconf:capability:candidate:1.0</capability><capability>urn:ietf:params:netconf:capability:rollback-on-error:1.0</capability><capability>urn:ietf:params:netconf:capability:validate:1.1</capability><capability>urn:ietf:params:netconf:capability:startup:1.0</capability><capability>urn:ietf:params:netconf:capability:xpath:1.0</capability><capability>urn:ietf:params:netconf:capability:with-defaults:1.0?basic-mode=explicit&also-supported=report-all,report-all-tagged,trim,explicit</capability><capability>urn:ietf:params:netconf:capability:notification:1.0</capability><capability>urn:ietf:params:netconf:capability:interleave:1.0</capability><capability>urn:ietf:params:xml:ns:yang:ietf-yang-metadata?module=ietf-yang-metadata&revision=2016-08-05</capability><capability>urn:ietf:params:xml:ns:yang:1?module=yang&revision=2017-02-20</capability><capability>urn:ietf:params:xml:ns:yang:ietf-inet-types?module=ietf-inet-types&revision=2013-07-15</capability><capability>urn:ietf:params:xml:ns:yang:ietf-yang-types?module=ietf-yang-types&revision=2013-07-15</capability><capability>urn:ietf:params:netconf:capability:yang-library:1.1?revision=2019-01-04&content-id=32</capability><capability>urn:sysrepo:plugind?module=sysrepo-plugind&revision=2020-12-10</capability><capability>urn:ietf:params:xml:ns:yang:ietf-netconf-acm?module=ietf-netconf-acm&revision=2018-02-14</capability><capability>urn:ietf:params:xml:ns:netconf:base:1.0?module=ietf-netconf&revision=2013-09-29&features=writable-running,candidate,rollback-on-error,validate,startup,url,xpath</capability><capability>urn:ietf:params:xml:ns:yang:ietf-netconf-with-defaults?module=ietf-netconf-with-defaults&revision=2011-06-01</capability><capability>urn:ietf:params:xml:ns:yang:ietf-netconf-notifications?module=ietf-netconf-notifications&revision=2012-02-06</capability><capability>urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring?module=ietf-netconf-monitoring&revision=2010-10-04</capability><capability>urn:ietf:params:xml:ns:netconf:notification:1.0?module=notifications&revision=2008-07-14</capability><capability>urn:ietf:params:xml:ns:netmod:notification?module=nc-notifications&revision=2008-07-14</capability><capability>urn:ietf:params:xml:ns:yang:ietf-x509-cert-to-name?module=ietf-x509-cert-to-name&revision=2014-12-10</capability><capability>urn:ietf:params:xml:ns:yang:iana-crypt-hash?module=iana-crypt-hash&revision=2014-08-06</capability></capabilities><session-id>1</session-id></hello>]]>]]>
```
```
root@r11-roll:/home/vyos# podman exec -it netopeer ls -la /etc/sysrepo/yang/
total 380
drwxrwxrwx 2 root root 4096 Jan 27 2021 .
drwxrwxrwx 5 root root 4096 Dec 14 17:54 ..
-rw-rw-r-- 1 root root 4203 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 69447 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 2615 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 14048 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 13169 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 17425 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 12357 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 10171 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 19334 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 3598 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 26724 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 26969 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 3812 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 13895 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 11658 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 5059 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 3627 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 3860 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 11903 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 8991 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 8874 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 11000 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 16255 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 2603 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 2364 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 6282 Jan 27 2021
[email protected]
-rw-rw-r-- 1 root root 433 Jan 27 2021
[email protected]
```