Open Message Interface Policies

Message interface policies get messages either from opcmsg command of API. Because messages are generally intercepted at managed nodes, network traffic to the management server is reduced. By distributing message source information from the management server to specific managed nodes, you have only the necessary configuration on each node.

Scripts that implement this type of policies can be augmented with additional files via HPOM Instrumentation Categories

With the HPOM message interface command opcmsg and application programming interface (API) opcmsg you can enable existing applications to send messages directly to HPOM.

Structure of the open message interface policy

Essentially this type of policy is a complex multilevel pattern matching rule with some subject area specific twists. The resulting policy is an XML file that can be copied and studies separately.

Policy is usually specified via GUI that has screen with four menu items at the top:

1. Properties,
2. Message Defaults,
3. Conditions,
4. Options.

The most important part is in Conditions submenu (See Conditions) Here you need to specify one or more conditions that select appropriate messages from the message stream for processing. Each condition consists of three major parts

1. First each message is processed against message matching template. Each incoming message will be tried to match against this template.
   • Typically you do not need to be fancy and can match message based on application field of the message (option -a in opcmsg).
   • Note: After typing an appropriate field you need  to press Enter to move the input field down. Only when the text you entered "migrates down" and input field became clean you can be save it. Otherwise your input will be lost.
   • See Conditions for detailed information

2. If matching is successful then parts of the Condition are triggered.

   • Message submenu allows you completely rewrite the message. In this part of the condition you can change fields of the matched message to produce a news message, the one that will be displayed on operator console. New message is injected into operator console stream that is seen by operators. It is unclear to me if the resulting message it can be injected back to the message stream and processed by other policies. 
   • Actions. In this part of condition you can execute arbitrary script or binary passing both system and user defined variables as parameters. You can also suppress displayed message on operator console (acknowledge the message) if the script of binary returned success as the result of their execution.

See

• Conditions
• HPOM Patterns
• Rewriting of Messages
• Condition Matching Optimization

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Last modified: March 12, 2019