In a sysplex subplexing environment, there are some additional
considerations for using ADNR. These steps are described in detail
in the following subtopics.
Before you begin
Each subplex containing resources that were managed by ADNR
before the sysplex was split into subplexes requires its own set of z/OS® Load Balancing Advisor and
Agent applications, and its own ADNR application, to continue to enable
ADNR to manage DNS names for those subplex resources. Each subplex
ADNR instance will communicate with the Advisor application in its
subplex. Each subplex ADNR instance will update separate DNS zones.
The ADNR instances for different subplexes cannot update the same
zone, because each zone can be updated by only one ADNR application
and ADNR can communicate with only one Advisor instance. There must
be a one-to-one correspondence between a subplex and a DNS zone.
Procedure
Perform the following steps to use ADNR in a sysplex
subplexing environment.
- Plan how the new subdomains representing each subplex will
fit into your DNS hierarchy.
- Configure the name servers that will be updated for the
new subplex domains.
- Define and configure one Advisor per subplex.
- Update the Agent configuration files to communicate with
the Advisor running in its subplex.
- Define one ADNR application per subplex.
- Assign the host_group and server_group statements from
the sysplex ADNR configuration to their correct subplex domains.
- Configure the new ADNR instances to update the name server
and zone for its subplex.
- Configure the new ADNR instances to communicate with the
subplex Advisor.
- (Optional) Update resolver configuration files.
- Start the TCP/IP stacks, Advisor, Agent, ADNR, and target
applications that ADNR will manage.
- Verify that each subplex ADNR is functioning correctly.