0
IN A
192.168.1.103
In the preceding example, it is important that the time to live (TTL) value for each of the records in
the round-robin group is very small (0-2 seconds). This is necessary so that clients that cache the
resolution results will quickly flush them. This allows for the distribution of the node of first contact
and allows a client to quickly move on to another node if it tries to contact a failed node.
Although it is recommended that applications implement more robust mechanisms like zeroconf
for distributing the node of first contact and skipping failed nodes, an administrator can use DNS to
assist with less sophisticated applications.
2.3.3. Preparing for Named Objects
For users to be able to access named objects over the Internet, you must enable incoming HTTP
requests to resolve to the correct domain. (A cluster can contain many domains, each of which can
contain many buckets, each of which can contain many named objects.) Cluster and domain names
should both be IANA-compatible host names like cluster.example.com and are discussed in
more detail in the DX Object Storage Administration Guide.
For example, a client application can create an object with a name like the following:
cluster.example.com/marketing/photos/ads/object-naming.3gp
In this example, cluster.example.com is the domain name, marketing is the name of a
bucket, and photos/ads/object-naming.3gp is the name of an object. You must set up your
network so the host name in the HTTP request maps correctly to the object's domain name. (The
cluster name is not important in this regard.)
To enable users to access the preceding object, you must set up one of the following:
• Set up your hosts file to map domain names to IP address(es) of the node of first contact.
For a Linux system, configure /etc/hosts
For a Windows system, configure %SystemRoot%\system32\drivers\etc\hosts
A sample hosts file follows:
192.168.1.111
192.168.1.112
• Define multiple DNS entries (that is, "A" or "CNAME" records) that specify the IP address(es) of
the DX Storage node of first contact.
Specifying multiple IP addresses for a DNS entry creates a DNS round-robin which provides client
request balancing.
For more information about setting up DNS for DX Storage, see
for Name
Resolution".
For details about setting up your DNS server, consult your DNS software documentation.
2.3.4. Setting Up SNMP for Monitoring
DX Storage exposes monitoring information and administrative controls through SNMP. An SNMP
console provides an administrator a mechanism with which to monitor a DX Storage cluster from
a central location. See the SNMP appendix in the DX Object Storage Administration Guide for
additional information. The SNMP MIB definition file for DX Storage is located as follows:
Copyright © 2010 Caringo, Inc.
All rights reserved
cluster.example.com
vault.example.com
9
Section 2.3.2, "Setting Up DNS
December 2010
Version 5.0
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