Chapter 4 System Configuration
© 2017 Harmonic Inc. All rights reserved. 128 Harmonic MediaGrid Release 4.1
Joining a Harmonic MediaGrid Cluster to a Windows Domain
Verify Communication with the Domain Controller
Follow the steps described in Verifying Communication with the Domain Controller.
Adding the Harmonic MediaGrid Devices to the Local DNS
An entry for each of the Harmonic MediaGrid devices below must be added to the customer’s
DNS for client access of the Harmonic MediaGrid system. This will result in the DNS providing a
round-robin allocation of the IP addresses when requested.
Contact the customer network administrator to complete these procedures.
The following entries must be added to the local DNS:
The ContentDirector names as well as the IP addresses of each public interface.
The ContentBridge (if present in the system) name and IP address.
The SystemManager name and IP address.
The Harmonic MediaGrid name, which should be associated with the public IP addresses of
all the ContentDirectors. This name is distinct from the individual names of the
ContentDirectors.
The ContentDirectors work together in a manner similar to a cluster. Because of this clustering
type of operation, clients can connect to any of the ContentDirectors. In order for this to happen,
the customer’s DNS must have the IP addresses of each of the ContentDirectors added (with the
same name). These address records (type A) should have a low TTL value (60 second range) due
to caching considerations.
Note that each ContentDirector has two ports for client access, which means that there will be
two address entries in the DNS for each ContentDirector. Since the DNS uses a cyclic round robin
allocation technique, the address records should be in the DNS in the following order:
It is also recommended that every DNS entry have
a reverse DNS entry. The entries above
associate an IP address with its host name (forward DNS entry). A reverse entry allows the
identification of a host name from an IP address.
Harmonic MediaGrid name ContentDirector 1 name port 1 IP address
Harmonic MediaGrid name ContentDirector 2 name port 1 IP address
Harmonic MediaGrid name ContentDirector 3 name port 1 IP address
Harmonic MediaGrid name ContentDirector 1 name port 2 IP address
Harmonic MediaGrid name ContentDirector 2 name port 2 IP address
Harmonic MediaGrid name ContentDirector 3 name port 2 IP address
And so on for any additional ContentDirectors
ContentBridge 2 name port 1 IP address
ContentBridge 1 name port 2 IP address
ContentBridge 2 name port 2 IP address
And so on for any additional ContentBridges
SystemManager name IP address
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