Resource Hierarchies - SIOS

Creating a DNS Resource Hierarchy
Creating a DNS Resource Hierarchy
The DNS Recovery Kit provides a mechanism to update the DNS A record and associated PTR
record (if exists) of the primary server or an alias name on all DNS servers in your configuration. The
kit allows selection of the name for the primary server or an alias name in DNS which will be modified
with the IP address of a backup server when failover or switchover occurs.
The example below shows the changes that occur on the DNS Server for a protected DNS resource
after failover or switchover.
DNS Server:
Primary Server: ExchSrvr1 (172.17.10.24/255.255.255.0)
Backup Server: ExchSrvr2 (172.16.10.25/255.255.255.0)
Zone: mydomain.com
Before failover:
A Record ExchSrvr1 172.17.10.24
ExchSrvr2 172.16.10.25
PTR Record 24.10.17.172.in-addr.arpa ExchSrvr1.mydomain.com
After Failover:
25.10.16.172.in-addr.arpa ExchSrvr2.mydomain.com
A Record ExchSrvr1 172.16.10.25
ExchSrvr2 172.16.10.25
PTR Record 25.10.16.172.in-addr.arpa ExchSrvr1.mydomain.com
25.10.16.172.in-addr.arpa ExchSrvr2.mydomain.com
During create of a DNS resource, enter the primary server name or an alias name which will be
modified on the primary DNS server upon failover or switchover. If the server is multi-homed, select
the IP address of the A record to be updated. The A and PTR records, based on the selection made
during the create, will be created if they do not exist on the DNS server. The records are created on
the primary DNS server specified during create and on all of the NS (Name server) servers who are
the primary zone servers for the A record.
The deep check script, which monitors the DNS resource, will check for the existence of the A record
of the protected server (either primary server name or alias name) on all of the DNS servers. If the A
record mapping to the correct IP address is not found on at least one of the DNS servers, the deep
check script will fail which will trigger local recovery (if enabled) and the A and PTR records will be
recreated on all of the primary DNS servers.
To create a DNS resource hierarchy from the primary server, you should complete the following
steps:
31 LifeKeeper Administration Overview