Adding configuration file of unbound, dnsdist and chrony

etc/chrony/chrony.conf

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+# /etc/chrony/chrony.conf : chrony conf. file for cantal
+#
+# Last edition : 2025-07-06
+# Last editor : @Campanu
+#
+
+# General
+bindaddress 0.0.0.0
+bindaddress 2a01:e0a:4d5:3c20::101b
+allow 0/0
+allow ::/0
+
+local stratum 2
+makestep 1.0 3
+#leapsectz right/UTC
+
+cmdport 0
+
+# Paths
+leapseclist /usr/share/zoneinfo/leap-seconds.list
+driftfile /var/lib/chrony/chrony.drift
+
+# Logs
+logdir /var/log/chrony
+log tracking measurements statistics
+clientloglimit 1048576
+
+## Client logging activated for tests
+#noclientlog
+
+# Rate limits
+ratelimit interval 2 burst 4 leak 2 
+ntsratelimit interval 2 burst 4 leak 2
+
+# NTS
+ntsntpserver ntp2.luc-geo.fr
+ntsserverkey /path/to/privkey.pem
+ntsservercert /path/to/fullchain.crt
+ntsdumpdir /var/lib/chrony
+
+# Synchronization servers
+
+## Stratum 1
+server ntp0.fau.de nts iburst
+server ntp0.ipv6.fau.de nts iburst prefer
+server ntp3.fau.de nts iburst
+server ntp3.ipv6.fau.de nts iburst prefer
+server ptbtime1.ptb.de nts iburst
+server ptbtime2.ptb.de nts iburst
+server ptbtime3.ptb.de nts iburst
+server ptbtime4.ptb.de nts iburst
+
+## Stratum 3 (fallback)
+server time.cloudflare.com nts iburst