Fix: add section to troubleshoot Avahi and mDNS #771
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I was resolution problems with Avahi on an openSUSE 15.2 host trying to resolve a sumaform'ed Uyuni server: ``` opensuse # avahi-resolve -n uyuni.tf.local uyuni.tf.local 192.168.122.154 ping: uyuni.tf.local: Name or service not known PING 192.168.122.154 (192.168.122.154) 56(84) bytes of data. 64 bytes from 192.168.122.154: icmp_seq=1 ttl=64 time=0.245 ms ``` The problem disappears when I change Avahi configuration in the Uyuni host to use the first-level domain `local` (instead of `tf.local`). Turns out that in the newest version of `nss-mdns` (shipping with OpenSUSE 15.2), second-level `.local` domains must be explicitly allowed to be resolved in `/etc/mdns.allow` AND `mdns` (not `mdns_minimal`) must be used in `nsswitch.conf`. The latter is already covered in the troubleshooting, I took care of adding the former information into the docs. Upstream issue: avahi/nss-mdns#64 Upstream resolution (linked in sumaform docs): https://github.com/lathiat/nss-mdns/blob/master/README.md#etcmdnsallow
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witekest
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Sep 16, 2020
rjmateus
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Sep 16, 2020
Bischoff
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Sep 16, 2020
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What does this PR change?
I was having resolution problems with Avahi on an openSUSE 15.2 host trying to resolve a sumaformed Uyuni server:
The problem disappears when I change Avahi configuration in the Uyuni host to use the first-level domain
local(instead oftf.local).Turns out that in the newest version of
nss-mdns(shipping with OpenSUSE 15.2), second-level.localdomains must be explicitly allowed to be resolved in/etc/mdns.allowANDmdns(notmdns_minimal) must be used innsswitch.conf.The latter is already covered in the troubleshooting, I took care of adding the former information into the docs.
Upstream issue: avahi/nss-mdns#64
Upstream resolution (linked in sumaform docs): https://github.com/lathiat/nss-mdns/blob/master/README.md#etcmdnsallow