Chapter 225. Nagios Component

Available as of Camel version 2.3

The Nagios component allows you to send passive checks to Nagios.

Maven users will need to add the following dependency to their pom.xml for this component: 

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-nagios</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

225.1. URI format

nagios://host[:port][?Options]

Camel provides two abilities with the Nagios component. You can send passive check messages by sending a message to its endpoint.
Camel also provides a EventNotifer which allows you to send notifications to Nagios.

225.2. Options

The Nagios component supports 2 options which are listed below.

NameDescriptionDefaultType

configuration (advanced)

To use a shared NagiosConfiguration

 

NagiosConfiguration

resolveProperty Placeholders (advanced)

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

boolean

The Nagios endpoint is configured using URI syntax: 

nagios:host:port

with the following path and query parameters:

225.2.1. Path Parameters (2 parameters):

NameDescriptionDefaultType

host

Required This is the address of the Nagios host where checks should be send.

 

String

port

Required The port number of the host.

 

int

225.2.2. Query Parameters (7 parameters):

NameDescriptionDefaultType

connectionTimeout (producer)

Connection timeout in millis.

5000

int

sendSync (producer)

Whether or not to use synchronous when sending a passive check. Setting it to false will allow Camel to continue routing the message and the passive check message will be send asynchronously.

true

boolean

timeout (producer)

Sending timeout in millis.

5000

int

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

encryption (security)

To specify an encryption method.

 

Encryption

encryptionMethod (security)

Deprecated To specify an encryption method.

 

NagiosEncryptionMethod

password (security)

Password to be authenticated when sending checks to Nagios.

 

String

225.3. Sending message examples

You can send a message to Nagios where the message payload contains the message. By default it will be OK level and use the CamelContext name as the service name. You can overrule these values using headers as shown above.

For example we send the Hello Nagios message to Nagios as follows: 

    template.sendBody("direct:start", "Hello Nagios");

    from("direct:start").to("nagios:127.0.0.1:5667?password=secret").to("mock:result");

To send a CRITICAL message you can send the headers such as: 

        Map headers = new HashMap();
        headers.put(NagiosConstants.LEVEL, "CRITICAL");
        headers.put(NagiosConstants.HOST_NAME, "myHost");
        headers.put(NagiosConstants.SERVICE_NAME, "myService");
        template.sendBodyAndHeaders("direct:start", "Hello Nagios", headers);

225.4. Using NagiosEventNotifer

The Nagios component also provides an EventNotifer which you can use to send events to Nagios. For example we can enable this from Java as follows: 

        NagiosEventNotifier notifier = new NagiosEventNotifier();
        notifier.getConfiguration().setHost("localhost");
        notifier.getConfiguration().setPort(5667);
        notifier.getConfiguration().setPassword("password");

        CamelContext context = ...
        context.getManagementStrategy().addEventNotifier(notifier);
        return context;

In Spring XML its just a matter of defining a Spring bean with the type EventNotifier and Camel will pick it up as documented here: Advanced configuration of CamelContext using Spring.

225.5. See Also

  • Configuring Camel
  • Component
  • Endpoint
  • Getting Started