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Defining the Roles of HostsLocate this document in the navigation structure

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After you have added hosts to the distributed system, you define which roles the hosts are to have. There are the following roles:

  • Master name servers

    There can be up to three master name servers in a distributed system. At least two must be defined. SeeConstraints for information on the hosts on which the master name servers must be located.

  • Master index servers and master queue servers
  • Slave index servers
  • Backup index servers and backup queue servers

Defining a Master Name Server

  1. Select the required host in the Hosts table.
  2. In the column Name Server Mode, choose 1st master, 2nd master, or 3rd master.

Defining a Master Index Server or Master Queue Server

  1. Select the required host in the Hosts table.
  2. Select Master Index/Queue Server.

Defining a Slave Index Server

  1. Select Use Slave Index Servers.
  2. Define the slave index server in the Hosts table.
    1. Select the host that you want to define as a slave index server.
    2. In the column Slave Index Server for… specify the master index server to which the server belongs.

Defining a Backup Index Server or Backup Queue Server

  1. Select Use Backup Index/Queue Servers.
  2. If the master servers are to share a backup server, select Use One Shared Backup Server.
    Tip

    The graphics below only depict the master and backup index servers. The graphics are also valid for master and backup queue servers.

    Example 1

    The following system has two master servers that are sharing a backup server.

    In this case, select Use One Shared Backup Server.

    Example 2

    In the following system, each master server has its own backup server.

    In this case, do not select Use One Shared Backup Server.

  3. Define the backup server in the Hosts table.
    1. Select the host that you want to define as a backup server.
    2. If you have selected Use One Shared Backup Server, you just need to indicate that the host is the backup server. If you did not select this field, specify the master server to which this server belongs in the column Backup Index/Queue Server for…