# Sentinel features

The following list contains some features which may be installed manually:

Feature Required Description

sentinel-core

true

Base feature, installing all required bundles such as `opennms:health-check` and service requirements for other bundles, e.g. `sentinel-persistence`.

sentinel-jms

false

Provides connectivity to the Meridian ActiveMQ Broker.

sentinel-kafka

false

Provides connectivity to Kafka.

sentinel-flows

false

Feature which starts all dependencies to start processing flows.

sentinel-newts

false

Provides functionality to persist measurement data to Newts.

sentinel-telemetry-nxos

false

Lets you use `NxosGpbAdapter`

sentinel-telemetry-jti

false

Lets you use the `JtiGpbAdapter`

sentinel-telemetry-bmp

false

Lets you use the `BmpTelemetryAdapter`

## Auto install

In some cases it is desired to automatically configure the Sentinel instance and also start required features/bundles. As Sentinel is based on Apache Karaf - which supports auto deployment by simply copying any kind of data to the `deploy` folder, Sentinel can make use of that mechanism to enable auto or hot deployment.

echo "sentinel-flows" | sudo tee -a ${SENTINEL_HOME}/etc/featuresBoot.d/sentinel-features.boot (2)``````  1 Install and start JMS communication feature. 2 Install and start Sentinel flows feature. ## Auto configure flow processing for Sentinel The following examples illustrate a `features.xml` which configures the Sentinel instance and automatically starts all required features to either consume messages via JMS (ActiveMQ) or Kafka. Simply copy it to `${SENTINEL_HOME}/deploy/`.

JMS
``````<?xml version="1.0" encoding="UTF-8"?>
<features
name="opennms-${project.version}" xmlns="http://karaf.apache.org/xmlns/features/v1.4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://karaf.apache.org/xmlns/features/v1.4.0 http://karaf.apache.org/xmlns/features/v1.4.0" > <!-- Bootstrap feature to start all flow related features automatically --> <feature name="autostart-sentinel-flows" version="${project.version}" start-level="100" install="auto">
<!-- Configure the controller itself -->
<config name="org.opennms.sentinel.controller">
location = SENTINEL
id = 00000000-0000-0000-0000-000000ddba11
http-url = http://127.0.0.1:8980/opennms
broker-url = failover:tcp://127.0.0.1:61616
</config>

<!-- Configure datasource connection -->
<config name="org.opennms.netmgt.distributed.datasource">
datasource.url = jdbc:postgresql://localhost:5432/opennms
datasource.databaseName = opennms
</config>
<!--
Starts the Netflow5Adapter to process Netflow5 Messages.
Be aware, that this requires a Listener with name "Netflow-5" on the Minion-side to have messages
processed properly.
-->
name = Netflow-5
</config>
<!-- Point sentinel to the correct elastic endpoint -->
<config name="org.opennms.features.flows.persistence.elastic">
elasticUrl = http://elasticsearch:9200
</config>
<!-- Install JMS related features -->
<feature>sentinel-jms</feature>
<!-- Install Flow related features -->
<feature>sentinel-flows</feature>
</feature>
</features>``````
Kafka
``````<?xml version="1.0" encoding="UTF-8"?>
<features
name="opennms-${project.version}" xmlns="http://karaf.apache.org/xmlns/features/v1.4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://karaf.apache.org/xmlns/features/v1.4.0 http://karaf.apache.org/xmlns/features/v1.4.0" > <!-- Bootstrap bootstrap feature to start all flow related features automatically --> <feature name="autostart-sentinel-telemetry-flows" version="${project.version}" start-level="200" install="auto">
<!-- Configure the controller itself -->
<config name="org.opennms.sentinel.controller">
location = SENTINEL
id = 00000000-0000-0000-0000-000000ddba11
http-url = http://127.0.0.1:8980/opennms
broker-url = failover:tcp://127.0.0.1:61616
</config>

<!-- Configure datasource connection -->
<config name="org.opennms.netmgt.distributed.datasource">
datasource.url = jdbc:postgresql://localhost:5432/opennms
datasource.databaseName = opennms
</config>
<!--
Starts the Netflow5Adapter to process Netflow5 Messages.
Be aware, that this requires a Listener with name "Netflow-5" on the Minion-side to have messages
processed properly.
-->
name = Netflow-5
</config>
<!-- Point sentinel to the correct elastic endpoint -->
<config name="org.opennms.features.flows.persistence.elastic">
elasticUrl = http://elasticsearch:9200
</config>
<!--
Configure as Kafka Consumer.
All properties described at https://kafka.apache.org/0100/documentation.html#newconsumerconfigs are supported.
-->
<config name="org.opennms.core.ipc.sink.kafka.consumer">
group.id = OpenNMS
bootstrap.servers = localhost:9092
</config>
<!--
Configure as Kafka Producer for sending Events from Sentinel.
All properties described at https://kafka.apache.org/0100/documentation.html#producerconfigs are supported.
-->
<config name="org.opennms.core.ipc.sink.kafka">
bootstrap.servers = localhost:9092
</config>
<!-- Install Kafka related features -->
<feature>sentinel-kafka</feature>
<!-- Install flow related features -->
<feature>sentinel-flows</feature>
</feature>
</features>``````

## Kafka Configuration

Each Minion works as a producer and must be configured beforehand. Please refer to section Minion Kafka Producer Configuration on how to configure Minion as a Kafka Producer.

Each Sentinel works as a Consumer and can be configured in the file `${SENTINEL_HOME}/etc/org.opennms.core.ipc.sink.kafka.consumer.cfg`. Either manually or via the `config:edit org.opennms.core.ipc.sink.kafka.consumer` statement. For supported properties, see here By default each Kafka Consumer starts consuming messages immediately after the feature has been started. It is possible to set a property `org.opennms.core.ipc.sink.initialSleepTime` to define an initial sleep time in ms before any messages are consumed. In order to set this up, please add an entry to the end of the file `${SENTINEL_HOME}/etc/system.properties`:

``````# Initial delay of 5 seconds before consuming of messages is started in milliseconds
org.opennms.core.ipc.sink.initialSleepTime=5000``````

## Persisting Collection Sets to Newts

In the previous chapter it is described on how to setup Meridian, Minion and Sentinel in order to distribute the processing of flows. However, it only covered flow processing adapters, but there are more, e.g. the `NxosGpbAdapter`, which can also be run on a Sentinel.

The configuration of Newts for Sentinel uses the same properties as for Meridian. The only difference is, that the properties for Sentinel are stored in `/opt/sentinel/etc/org.opennms.newts.config.cfg` instead of `*.properties` files. The name of each property is the same as for Meridian without the `org.opennms.newts.config` prefix. The following example shows a custom Newts configuration using the Sentinel's Karaf Shell.

`$ssh -p 8301 admin@localhost` ```admin@sentinel> config:edit org.opennms.newts.config admin@sentinel> config:property-set hostname localhost admin@sentinel> config:property-set port 9042 admin@sentinel> config:property-set cache.strategy org.opennms.netmgt.newts.support.GuavaSearchableResourceMetadataCache admin@sentinel> config:update``` ### Adapters This chapter describes the various adapters which may contain sample data which may be stored to a Persistence Storage and can also run on a Sentinel. At the moment only Newts is supported as a Persistence Storage. See chapter [ga-sentinel-configure-newts] on how to configure Newts. In order to get it to work properly, please note, that an appropriate listener on the Minion must also be configured. The name of the listener should share the same name on Sentinel. #### SFlowTelemetryAdapter In order to use this adapter, the feature `sentinel-flows` and `sentinel-newts` must be installed. In addition either `sentinel-jms` or `sentinel-kafka` should be installed and configured properly. See the previous Flow Processing chapter for more details. If only sample data should be persisted, the following commands can be run on the Sentinel's Karaf Shell `$ ssh -p 8301 admin@localhost`
```admin@sentinel> config:edit --alias sflow --factory org.opennms.features.telemetry.adapters

If SFlow flows and the sample data should be processed, multiple adapters can be configured:

```config:edit --alias sflow-telemetry --factory org.opennms.features.telemetry.adapters
config:property-set name SFlow
config:update```

Please note, that in both cases the file `/opt/sentinel/etc/sflow-host.groovy` must be provided manually, e.g. by manually copying it over from Meridian.

In order to use this adapter, the feature `sentinel-telemetry-nxos` and `sentinel-newts` must be installed. In addition either `sentinel-jms` or `sentinel-kafka` should be installed and configured properly. See the previous Flow Processing chapter for more details.

Besides this, configuration files from Meridian must be copied to Sentinel to `/opt/sentinel/etc`. The following files and directories are required:

• `${OPENNMS_HOME}/etc/datacollection` • `${OPENNMS_HOME}/etc/datacollection-config.xml`

• `${OPENNMS_HOME}/etc/resource-types.d` Afterwards the adapter can be set up: `$ ssh -p 8301 admin@localhost`
```admin@sentinel> config:edit --alias nxos --factory org.opennms.features.telemetry.adapters

Please note, that the file `/opt/sentinel/etc/cisco-nxos-telemetry-interface.groovy` must also be provided manually, e.g. by manually copying it over from Meridian.

In order to use this adapter, the feature `sentinel-telemetry-jti` and `sentinel-newts` must be installed. In addition either `sentinel-jms` or `sentinel-kafka` should be installed and be configured properly. See the previous Flow Processing chapter for more details.

Besides this, configuration files from Meridian must be copied to Sentinel to `/opt/sentinel/etc`. The following files and directories are required:

• `${OPENNMS_HOME}/etc/datacollection` • `${OPENNMS_HOME}/etc/datacollection-config.xml`

• `${OPENNMS_HOME}/etc/resource-types.d` Afterwards the adapter can be set up: `$ ssh -p 8301 admin@localhost`
```admin@sentinel> config:edit --alias jti --factory org.opennms.features.telemetry.adapters
Please note, that the file `/opt/sentinel/etc/junos-telemetry-interface.groovy` must also be provided manually, e.g. by manually copying it over from Meridian.