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254 lines
9.8 KiB
Markdown
254 lines
9.8 KiB
Markdown
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# Nagios Json Plugin
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This is a generic plugin for Nagios which checks json values from a given HTTP endpoint against argument specified rules and determines the status and performance data for that service.
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## Links
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* [CLI Usage](#cli-usage)
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* [Examples](#examples)
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* [Riak Stats](docs/RIAK.md)
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* [Docker](docs/DOCKER.md)
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* [Nagios Installation](#nagios-installation)
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## CLI Usage
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Executing `./check_http_json.py -h` will yield the following details:
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```
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usage: check_http_json.py [-h] [-d] [-s] -H HOST [-k] [-V] [--cacert CACERT]
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[--cert CERT] [--key KEY] [-P PORT] [-p PATH]
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[-t TIMEOUT] [-B AUTH] [-D DATA] [-A HEADERS]
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[-f FIELD_SEPARATOR] [-F VALUE_SEPARATOR]
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[-w [KEY_THRESHOLD_WARNING [KEY_THRESHOLD_WARNING ...]]]
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[-c [KEY_THRESHOLD_CRITICAL [KEY_THRESHOLD_CRITICAL ...]]]
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[-e [KEY_LIST [KEY_LIST ...]]]
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[-E [KEY_LIST_CRITICAL [KEY_LIST_CRITICAL ...]]]
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[-q [KEY_VALUE_LIST [KEY_VALUE_LIST ...]]]
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[-Q [KEY_VALUE_LIST_CRITICAL [KEY_VALUE_LIST_CRITICAL ...]]]
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[-u [KEY_VALUE_LIST_UNKNOWN [KEY_VALUE_LIST_UNKNOWN ...]]]
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[-y [KEY_VALUE_LIST_NOT [KEY_VALUE_LIST_NOT ...]]]
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[-Y [KEY_VALUE_LIST_NOT_CRITICAL [KEY_VALUE_LIST_NOT_CRITICAL ...]]]
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[-m [METRIC_LIST [METRIC_LIST ...]]]
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Check HTTP JSON Nagios Plugin
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Generic Nagios plugin which checks json values from a given endpoint against
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argument specified rules and determines the status and performance data for
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that service.
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Version: 2.2.0 (2024-05-14)
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options:
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-h, --help show this help message and exit
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-d, --debug debug mode
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-v, --verbose Verbose mode. Multiple -v options increase the verbosity
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-s, --ssl use TLS to connect to remote host
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-H HOST, --host HOST remote host to query
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-k, --insecure do not check server SSL certificate
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-X {GET,POST}, --request {GET,POST}
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Specifies a custom request method to use when communicating with the HTTP server
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-V, --version print version of this plugin
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--cacert CACERT SSL CA certificate
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--cert CERT SSL client certificate
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--key KEY SSL client key ( if not bundled into the cert )
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-P PORT, --port PORT TCP port
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-p PATH, --path PATH Path
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-t TIMEOUT, --timeout TIMEOUT
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Connection timeout (seconds)
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--unreachable-state UNREACHABLE_STATE
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Exit with specified code if URL unreachable. Examples: 1 for Warning, 2 for Critical, 3 for Unknown (default: 3)
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-B AUTH, --basic-auth AUTH
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Basic auth string "username:password"
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-D DATA, --data DATA The http payload to send as a POST
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-A HEADERS, --headers HEADERS
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The http headers in JSON format.
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-f SEPARATOR, --field_separator SEPARATOR
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JSON Field separator, defaults to "."; Select element in an array with "(" ")"
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-F VALUE_SEPARATOR, --value_separator VALUE_SEPARATOR
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JSON Value separator, defaults to ":"
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-w [KEY_THRESHOLD_WARNING ...], --warning [KEY_THRESHOLD_WARNING ...]
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Warning threshold for these values (key1[>alias],WarnRange key2[>alias],WarnRange). WarnRange is in the format
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[@]start:end, more information at nagios-plugins.org/doc/guidelines.html.
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-c [KEY_THRESHOLD_CRITICAL ...], --critical [KEY_THRESHOLD_CRITICAL ...]
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Critical threshold for these values (key1[>alias],CriticalRange key2[>alias],CriticalRange. CriticalRange is in
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the format [@]start:end, more information at nagios-plugins.org/doc/guidelines.html.
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-e [KEY_LIST ...], --key_exists [KEY_LIST ...]
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Checks existence of these keys to determine status. Return warning if key is not present.
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-E [KEY_LIST_CRITICAL ...], --key_exists_critical [KEY_LIST_CRITICAL ...]
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Same as -e but return critical if key is not present.
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-q [KEY_VALUE_LIST ...], --key_equals [KEY_VALUE_LIST ...]
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Checks equality of these keys and values (key[>alias],value key2,value2) to determine status. Multiple key values
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can be delimited with colon (key,value1:value2). Return warning if equality check fails
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-Q [KEY_VALUE_LIST_CRITICAL ...], --key_equals_critical [KEY_VALUE_LIST_CRITICAL ...]
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Same as -q but return critical if equality check fails.
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-u [KEY_VALUE_LIST_UNKNOWN ...], --key_equals_unknown [KEY_VALUE_LIST_UNKNOWN ...]
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Same as -q but return unknown if equality check fails.
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-y [KEY_VALUE_LIST_NOT ...], --key_not_equals [KEY_VALUE_LIST_NOT ...]
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Checks equality of these keys and values (key[>alias],value key2,value2) to determine status. Multiple key values
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can be delimited with colon (key,value1:value2). Return warning if equality check succeeds
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-Y [KEY_VALUE_LIST_NOT_CRITICAL ...], --key_not_equals_critical [KEY_VALUE_LIST_NOT_CRITICAL ...]
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Same as -q but return critical if equality check succeeds.
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-m [METRIC_LIST ...], --key_metric [METRIC_LIST ...]
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Gathers the values of these keys (key[>alias], UnitOfMeasure,WarnRange,CriticalRange,Min,Max) for Nagios
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performance data. More information about Range format and units of measure for nagios can be found at nagios-
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plugins.org/doc/guidelines.html Additional formats for this parameter are: (key[>alias]),
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(key[>alias],UnitOfMeasure), (key[>alias],UnitOfMeasure,WarnRange, CriticalRange).
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```
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## Examples
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### Key Naming
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**Data for key** `value`:
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{ "value": 1000 }
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**Data for key** `capacity.value`:
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{
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"capacity": {
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"value": 1000
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}
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}
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**Data for key** `(0).capacity.value`:
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[
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{
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"capacity": {
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"value": 1000
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}
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}
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]
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**Data for keys of all items in a list** `(*).capacity.value`:
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[
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{
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"capacity": {
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"value": 1000
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}
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},
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{
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"capacity": {
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"value": 2200
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}
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}
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]
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**Data for separator** `-f _` **and key** `(0)_gauges_jvm.buffers.direct.capacity_value`:
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[
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{
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"gauges": {
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"jvm.buffers.direct.capacity":
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"value": 1000
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}
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}
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}
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]
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**Data for keys** `ring_members(0)`, `ring_members(1)`, `ring_members(2)`:
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{
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"ring_members": [
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"riak1@127.0.0.1",
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"riak2@127.0.0.1",
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"riak3@127.0.0.1"
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]
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}
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### Thresholds and Ranges
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**Data**:
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{ "metric": 1000 }
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#### Relevant Commands
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* **Warning:** `./check_http_json.py -H <host>:<port> -p <path> -w "metric,RANGE"`
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* **Critical:** `./check_http_json.py -H <host>:<port> -p <path> -c "metric,RANGE"`
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* **Metrics with Warning:** `./check_http_json.py -H <host>:<port> -p <path> -w "metric,RANGE"`
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* **Metrics with Critical:**
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./check_http_json.py -H <host>:<port> -p <path> -w "metric,,,RANGE"
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./check_http_json.py -H <host>:<port> -p <path> -w "metric,,,,MIN,MAX"
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#### Range Definitions
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* **Format:** [@]START:END
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* **Generates a Warning or Critical if...**
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* **Value is less than 0 or greater than 1000:** `1000` or `0:1000`
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* **Value is greater than or equal to 1000, or less than or equal to 0:** `@1000` or `@0:1000`
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* **Value is less than 1000:** `1000:`
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* **Value is greater than 1000:** `~:1000`
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* **Value is greater than or equal to 1000:** `@1000:`
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More info about Nagios Range format and Units of Measure can be found at [https://nagios-plugins.org/doc/guidelines.html](https://nagios-plugins.org/doc/guidelines.html).
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#### Using Headers
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* `./check_http_json.py -H <host>:<port> -p <path> -A '{"content-type": "application/json"}' -w "metric,RANGE"`
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## Nagios Installation
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### Requirements
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* Python 3.6+
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### Configuration
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Assuming a standard installation of Nagios, the plugin can be executed from the machine that Nagios is running on.
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```bash
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cp check_http_json.py /usr/local/nagios/libexec/plugins/check_http_json.py
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chmod +x /usr/local/nagios/libexec/plugins/check_http_json.py
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```
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Add the following service definition to your server config (`localhost.cfg`):
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```
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define service {
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use local-service
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host_name localhost
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service_description <command_description>
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check_command <command_name>
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}
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```
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Add the following command definition to your commands config (`commands.config`):
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```
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define command{
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command_name <command_name>
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command_line /usr/bin/python /usr/local/nagios/libexec/plugins/check_http_json.py -H <host>:<port> -p <path> [-e|-q|-w|-c <rules>] [-m <metrics>]
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}
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```
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## Icinga2 configuration
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The Icinga2 command definition can be found here: (contrib/icinga2_check_command_definition.conf)
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## License
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Copyright 2014-2015 Drew Kerrigan.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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