initial code repo

[stor4nfv.git] / src / ceph / doc / rados / configuration / mon-lookup-dns.rst

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+===============================
+Looking op Monitors through DNS
+===============================
+
+Since version 11.0.0 RADOS supports looking up Monitors through DNS.
+
+This way daemons and clients do not require a *mon host* configuration directive in their ceph.conf configuration file.
+
+Using DNS SRV TCP records clients are able to look up the monitors.
+
+This allows for less configuration on clients and monitors. Using a DNS update clients and daemons can be made aware of changes in the monitor topology.
+
+By default clients and daemons will look for the TCP service called *ceph-mon* which is configured by the *mon_dns_srv_name* configuration directive.
+
+
+``mon dns srv name``
+
+:Description: the service name used querying the DNS for the monitor hosts/addresses
+:Type: String
+:Default: ``ceph-mon``
+
+Example
+-------
+When the DNS search domain is set to *example.com* a DNS zone file might contain the following elements.
+
+First, create records for the Monitors, either IPv4 (A) or IPv6 (AAAA).
+
+::
+
+    mon1.example.com. AAAA 2001:db8::100
+    mon2.example.com. AAAA 2001:db8::200
+    mon3.example.com. AAAA 2001:db8::300
+
+::
+
+    mon1.example.com. A 192.168.0.1
+    mon2.example.com. A 192.168.0.2
+    mon3.example.com. A 192.168.0.3
+
+
+With those records now existing we can create the SRV TCP records with the name *ceph-mon* pointing to the three Monitors.
+
+::
+
+    _ceph-mon._tcp.example.com. 60 IN SRV 10 60 6789 mon1.example.com.
+    _ceph-mon._tcp.example.com. 60 IN SRV 10 60 6789 mon2.example.com.
+    _ceph-mon._tcp.example.com. 60 IN SRV 10 60 6789 mon3.example.com.
+
+In this case the Monitors are running on port *6789*, and their priority and weight are all *10* and *60* respectively.
+
+The current implementation in clients and daemons will *only* respect the priority set in SRV records, and they will only connect to the monitors with lowest-numbered priority. The targets with the same priority will be selected at random.