Note: I could not find a good title, feel free to change it if needed
After migrating to Stretch, I could not chat with XMPP anymore. After digging on the server with ssh, I ran the command regen-conf and I got surprises :
- Some services are marked as modified while I did not changed anything myself. Is it a known issue ?
- Will it an issue for the future and next upgrades?
So I made this post to share the experience and to get feedback about this behavior. Can it be bad for other people / users ?
After running the command yunohost service regen-conf, I got the following results
Affected services
- dnsmask
- fail2ban
- metronome
- mysql
- nslcd
- postfix
I will go through them one by one and try to fix the issues identified previously
I am not going to explain in details how the command regen-conf works, I will just show the help. Feel free to come back to it in order to understand what the options I will use latter are made for
- dnsmask
After following this post Erreur dnsmasq sur un serveur OVH Kimsufi, I was able to :
- find that my server (kimsufi box) has a default software installed that interfere with
dnsmask - stop
bind9 - fix dnsmask by running
yunohost service regen-conf dnsmasq -f -d
I add to disable bind9 too so it does not come back on next reboot : systemctl disable bind9
Well, the message is still there so I might do something else “later” or with an other service.
- fail2ban
I did not modify the file by hand and the new file seemed fine so I ran the update
- metronome
I remember changing it myself in the past. Config file agrees with me. So I overwrite my changes
Now, it works again on my phone \o/
- mysql
I did not changed anything so I was surprised.
After having a look, the difference comes from the migration process, not a big deal.
- nslcd
I do not know what it does so I ran the update /o\
- postfix
I do not use the emails so I ran the update anyway /o\
Same process as above to regen the configuration
Conclusion
dnsmaq configuration cannot be regenerated. Otherwise, server seems to be clean now 
