Database Reference
In-Depth Information
deliver
: ONS notification delivery information
•
special
: ONS special notification processing
•
internal
: ONS internal resource information
•
secure
: ONS SSL operation information
•
workers
: ONS worker threads
The
logfile
specifies the log file to be used by ONS to log messages. If no
logfile
is specified, messages are
written to the
$GRID_HOME/opmn/logs
directory. The
useocr
parameter (valid values
on
/
off
) indicates whether ONS
should use the OCR to determine which instances and nodes are participating in the cluster. The
walletfile
is used
by the Oracle Secure Sockets Layer (SSL) to store SSL certificates. If a wallet file is specified to ONS, then it uses SSL
when communicating with other ONS instances and requires SSL certificate authentication from all ONS instances
that try to connect to it. The
nodes
parameter lists all nodes in the network that will need to receive or send event
notifications. It specifies the list of other ONS daemons to talk to. This list should include all RAC ONS daemons and
all middle-tier ONS daemons. Listing the nodes ensures that the middle-tier node can communicate with the RAC
nodes. Node values are given as either host names or IP addresses followed by their
remoteport
. This includes all RAC
nodes client machines where ONS is also running to receive FAN events for applications.
Port information can also be verified using the following:
•
[oracle@ssky1l1p1 ~]$ $GRID_HOME/bin/srvctl config nodeapps -onsonly
ONS exists: Local port 6100, remote port 6200, EM port 2016
■
Note
the nodes listed in the nodes lines are public ip addresses and not Vip addresses.
A similar configuration is also to be performed on all client machines, and all node addresses should be
cross-registered in the
ons.config
file on the respective machines.
ONS Communication
As mentioned earlier, ONS communicates all events generated by the
EVMD
processes to all nodes registered with the
ONS. Figure
15-3
illustrates the notification channels that ONS will follow when an Oracle-related state change occurs
on any of the nodes participating in the clustered configuration.
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