Installing a secondary Monitoring Cluster

First, prepare the monitoring cluster — the cluster you will use to store and analyze Marvel’s data. For this example, we will assume two hosts, es-mon-1 and es-mon-2, are in the monitoring cluster.

The monitoring cluster

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For each node in the monitoring cluster:

Prevent the nodes in the monitoring cluster from generating their own stats, by adding the following line to config/elasticsearch.yml:
```
marvel.agent.enabled: false
```
Install the plugin. From the Elasticsearch home directory run
```
bin/plugin -i elasticsearch/marvel/latest
```
Restart Elasticsearch

The production cluster

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Tell each node where to send its stats by adding this line to `config/elasticsearch.yml:
```
marvel.agent.exporter.es.hosts: ["es-mon-1:9200","es-mon-2:9200"]
```
This line adds two hosts of your monitoring cluster to receive the data, a primary and a backup.
Install the plugin. From the Elasticsearch home directory run
```
bin/plugin -i elasticsearch/marvel/latest
```
Restart Elasticsearch

Once the plugin is installed on all nodes, you can access the Marvel UI by opening this link with any modern browser.

http://any-server-in-monitoring-cluster:9200/_plugin/marvel/

It may take a minute or two for data to appear.

You may want to temporarily disable shard allocation before you restart your nodes to avoid unnecessary shard reallocation during the install process.

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