An ElasticSearch availability and performance monitoring plugin for Nagios
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check_elasticsearch

An ElasticSearch availability and performance monitoring plugin for Nagios.

How it works

This plugin works by submitting API requests to a local or remote ElasticSearch server. ElasticSearch servers will respond to these API requests by default. If yours don't, check that you have not set http.enabled to false.

This plugin may be used to monitor ElasticSearch data and proxy nodes.
It is important that you run one instance of this plugin for each data node in your ElasticSearch cluster. Certain failure modes that can be localised to a particular data node will not be reported by unaffected data or proxy nodes.

ElasticSearch defines its own thresholds for 'green', 'yellow', and 'red'. Most other ElasticSearch monitoring plugins simply take this 'health colour' and map it directly to a Nagios check status (OK, WARNING, or CRITICAL, respectively). While that approach will work (insofar as it will report a problem that ElasticSearch has detected), an operator is going to need more information to narrow a real problem down to its root cause. ('Why is my cluster yellow?')

This monitoring plugin requests detailed operational data from ElasticSearch and uses that information to derive its own 'health colour'. If our health colour concurs with ElasticSearch's health colour, then we can be reasonably sure we know what is wrong with the cluster and may report that problem to the operator.

Installation

pip install nagios-plugin-elasticsearch (from PyPi).

Usage:

check_elasticsearch [options]

Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  -v, --verbose
  -f FAILURE_DOMAIN, --failure-domain=FAILURE_DOMAIN
                        A comma-separated list of ElasticSearch attributes
                        that make up your cluster's failure domain[0].  This
                        should be the same list of attributes that
                        ElasticSearch's location-aware shard allocator has
                        been configured with.  If this option is supplied,
                        additional checks are carried out to ensure that
                        primary and replica shards are not stored in the same
                        failure domain.
			[0]: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-cluster.html
  -H HOST, --host=HOST  Hostname or network address to probe.  The
                        ElasticSearch API should be listening here.  Defaults
                        to 'localhost'.
  -m MASTER_NODES, --master-nodes=MASTER_NODES
                        Issue a warning if the number of master-eligible nodes
                        in the cluster drops below this number.  By default,
                        do not monitor the number of nodes in the cluster.
  -p PORT, --port=PORT  TCP port to probe.  The ElasticSearch API should be
                        listening here.  Defaults to 9200.
  -y YELLOW_CRITICAL, --yellow-critical=TRUE
                        Instead of issuing a 'warning' for a yellow cluster
                        state, issue a 'critical' alert. Allows for greater
                        control of alerting for clusters that may be of 
                        greater sensitivity (or fragility). Defaults to False.

Requirements