FedFsDnsSrv0.9
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Revision as of 17:37, 9 October 2012
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Project: fedfs-utils
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Introduction
To permit clients to find the top-level directory of a FedFS domain's name space, the NFS server that exports that directory is advertised via a DNS SRV record. Typically a client mounts this directory at /nfs4/<fedfs-domain-name> .
This article describes two easy ways to configure the DNS SRV record. Either method can be used.
- Public FedFS domain
- If you have administrative access to your domain name service, you can add a DNS SRV record which advertises your FedFS domain globally
- Private FedFS domain
- If you do not have administrative access to your domain name service, you can set up a forwarding DNS host to which your FedFS-enabled clients refer
Adding a DNS SRV to an existing DNS
Suppose you want to advertise the FedFS domain "example.net. You've already set up your FedFS domain root on an NFS server called server.example.net.
In the zone file for example.net, add the following record:
_nfs-domainroot._tcp IN SRV 0 0 2049 server.example.net.
Update your zone serial number, save the zone file, and reload your DNS server (usually "sudo rndc reload" works).
You can add more than one SRV record which refer to other NFS servers that contain a copy of the domain root.
Setting up a forwarding DNS
Some of this setup may not be necessary but it is what I use to setup DNS instances for testing. Also many of the files created should be included in a caching nameserver package. Installing the caching nameserver package and making appropriate modifications to turn the caching nameserver into a forwarding nameserver is really all that needs to be done. Of course the fedfs zone files will always be needed.
The example assumes the private IP address range 192.168.1 is being used and a nameserver that is able to satisfy name resolution for external names is at 192.168.1.1. The example hosts perseus.fedfs.org and zeus.fedfs.org are assigned addresses 192.168.1.32 and 192.168.1.31 respectively.
Set up zeus.fedfs.org as a forwarding DNS server
mkdir -p /var/named/master/fedfs.org if [ ! -d /var/named/data ]; then mkdir /var/named/data fi
Create /var/named/named.root using:
dig +norec NS > /var/named/named.root
Create /etc/named.rfc1912.zones as:
// named.rfc1912.zones: // // ISC BIND named zone configuration for zones recommended by // RFC 1912 section 4.1 : localhost TLDs and address zones // zone "localdomain" IN { type master; file "localdomain.zone"; allow-update { none; }; }; zone "localhost" IN { type master; file "localhost.zone"; allow-update { none; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "named.local"; allow-update { none; }; }; zone "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN { type master; file "named.ip6.local"; allow-update { none; }; }; zone "255.in-addr.arpa" IN { type master; file "named.broadcast"; allow-update { none; }; }; zone "0.in-addr.arpa" IN { type master; file "named.zero"; allow-update { none; }; };
Create /var/named/localdomain.zone as:
$TTL 86400 @ IN SOA localhost root ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS localhost localhost IN A 127.0.0.1
Create /var/named/localhost.zone
$TTL 86400 @ IN SOA @ root ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS @ IN A 127.0.0.1 IN AAAA ::1
Create /var/named/named.local as:
$TTL 86400 @ IN SOA localhost. root.localhost. ( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS localhost. 1 IN PTR localhost.
Create /var/named/named.ip6.local as:
$TTL 86400 @ IN SOA localhost. root.localhost. ( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS localhost. 1 IN PTR localhost.
Create /var/named/named.broadcast as:
$TTL 86400 @ IN SOA localhost. root.localhost. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS localhost.
Create /var/named/named.zero as:
$TTL 86400 @ IN SOA localhost. root.localhost. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS localhost.
Create /etc/named.conf as:
options {
listen-on port 53 { any; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
allow-query { any; };
forwarders { 192.168.1.1; };
recursion yes;
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "." IN {
type hint;
file "named.root";
};
include "/etc/named.rfc1912.zones";
include "/var/named/master/fedfs.org/zone.fedfs.org";
Create /var/named/master/fedfs.org/zone.fedfs.org as:
zone "fedfs.org" {
type master;
notify no;
file "master/fedfs.org/db.fedfs.org";
};
zone "1.168.192.in-addr.arpa" {
type master;
notify no;
file "master/fedfs.org/db.192.168.1";
};
Create /var/named/master/fedfs.org/db.fedfs.org as:
$TTL 3D @ IN SOA ns.fedfs.org. hostmaster.fedfs.org. ( 199802152 ; serial, todays date + todays serial # 8H ; refresh, seconds 2H ; retry, seconds 4W ; expire, seconds 1D ) ; minimum, seconds ; NS ns ; Inet Address of name server ; localhost A 127.0.0.1 ns A 192.168.1.32 zeus A 192.168.1.32 perseus A 192.168.1.31 ; Assume these aren't present, they've been left to show an example ; of the SRV record that would be used for a read-write FedFS domain ; rather than the read-only setup we use here. ;_nfs4._domainroot._tcp SRV 0 0 2049 perseus.fedfs.org. ;_nfs4._write._domainroot._tcp SRV 0 0 2049 perseus.fedfs.org.
Create /var/named/master/fedfs.org/db.192.168.1 as:
$TTL 3D @ IN SOA ns.fedfs.org. hostmaster.fedfs.org. ( 199802151 ; Serial, todays date + todays serial 8H ; Refresh 2H ; Retry 4W ; Expire 1D) ; Minimum TTL NS ns.fedfs.org. 32 PTR ns.fedfs.org. 32 PTR zeus.fedfs.org. 31 PTR perseus.fedfs.org.
Start the new name service with:
service named start
or
systemctl start named.service
