License
MIT License
The http-checks is a collection of Sensu Checks that providing monitoring
and metrics for HTTP based services.
Portions of http-check and http-json are based on and/or derived from the HTTP
check found in the NCR DevOps Platform nagiosfoundation collection of
checks.
This collection contains the following checks:
http-check
- for checking HTTP status or searching for a string in thehttp-perf
- for checking HTTP performance by measuring response times,http-json
- for querying JSON output from an HTTP requesthttp-get
- for fetching metrics from HTTP sourcesHTTP Status/String Check
Usage:
http-check [flags]
http-check [command]
Available Commands:
help Help about any command
version Print the version number of this plugin
Flags:
-u, --url string URL to test (default "http://localhost:80/")
-s, --search-string string String to search for, if not provided do status check only
-r, --redirect-ok Allow redirects
-T, --timeout int Request timeout in seconds (default 15)
-H, --header strings Additional header(s) to send in check request
-C, --mtls-cert-file string Certificate file for mutual TLS auth in PEM format
-K, --mtls-key-file string Key file for mutual TLS auth in PEM format
-t, --trusted-ca-file string TLS CA certificate bundle in PEM format
-i, --insecure-skip-verify Skip TLS certificate verification (not recommended!)
-h, --help help for http-check
Use "http-check [command] --help" for more information about a command.
http-check --url https://sensu.io --search-string Monitoring
http-check OK: found "Monitoring" at https://sensu.io
http-check --url https://sensu.io --search-string droids
http-check CRITICAL: "droids" not found at https://sensu.io
http-check --url https://sensu.io
http-check OK: HTTP Status 200 for https://sensu.io
http-check --url https://sensu.io/notfound
http-check WARNING: HTTP Status 301 for https://sensu.io/notfound (redirects to /oops)
http-check --url https://sensu.io/notfound --redirect-ok
http-check OK: HTTP Status 200 for https://sensu.io/oops (redirect from https://sensu.io/notfound)
http-check --url https://discourse.sensu.io/notfound
http-check CRITICAL: HTTP Status 404 for https://discourse.sensu.io/notfound
http-check --url http://localhost:8000/health --header "Origin: test.server.local" --header "RandomHeader: Header value goes here"
http-check OK: HTTP Status 200 for http://localhost:8000/health
--redirect-ok
it affects both the string search and status checkfunctionality.
warning
status. If true, it will return an ok
status.HTTP Performance Check
Usage:
http-perf [flags]
http-perf [command]
Available Commands:
help Help about any command
version Print the version number of this plugin
Flags:
-u, --url string URL to test (default "http://localhost:80/")
-T, --timeout int Request timeout in seconds (default 15)
-w, --warning string Warning threshold, can be expressed as seconds or milliseconds (1s = 1000ms) (default "1s")
-c, --critical string Critical threshold, can be expressed as seconds or milliseconds (1s = 1000ms) (default "2s")
-m, --output-in-ms Provide output in milliseconds (default false, display in seconds)
-H, --header strings Additional header(s) to send in check request
-C, --mtls-cert-file string Certificate file for mutual TLS auth in PEM format
-K, --mtls-key-file string Key file for mutual TLS auth in PEM format
-t, --trusted-ca-file string TLS CA certificate bundle in PEM format
-i, --insecure-skip-verify Skip TLS certificate verification (not recommended!)
-h, --help help for http-perf
Use "http-perf [command] --help" for more information about a command.
http-perf --url https://sensu.io --warning 1s --critical 2s
http-perf OK: 0.243321s | dns_duration=0.016596, tls_handshake_duration=0.172235, connect_duration=0.022199, first_byte_duration=0.243267, total_request_duration=0.243321
# Let's make the warning threshold pretty improbable
http-perf --url https://sensu.io --warning 10ms --critical 1s
http-perf WARNING: 0.304795s | dns_duration=0.033904, tls_handshake_duration=0.198843, connect_duration=0.021858, first_byte_duration=0.304747, total_request_duration=0.304795
# Again, but with output in milliseconds
http-perf --url https://sensu.io --warning 10ms --critical 1s --output-in-ms
http-perf WARNING: 262ms | dns_duration=35, tls_handshake_duration=170, connect_duration=22, first_byte_duration=262, total_request_duration=262
# With cusomter header(s)
http-perf --url https://sensu.io --warning 1s --critical 2s --header "Custom-Header: Custom header value"
http-perf OK: 0.243321s | dns_duration=0.016596, tls_handshake_duration=0.172235, connect_duration=0.022199, first_byte_duration=0.243267, total_request_duration=0.243321
HTTP JSON Check
Usage:
http-json [flags]
http-json [command]
Available Commands:
help Help about any command
version Print the version number of this plugin
Flags:
-u, --url string URL to test (default "http://localhost:80/")
-q, --query string Query written in jq format
-e, --expression string Expression for comparing result of query
-H, --header strings Additional header(s) to send in check request
-C, --mtls-cert-file string Certificate file for mutual TLS auth in PEM format
-K, --mtls-key-file string Key file for mutual TLS auth in PEM format
-i, --insecure-skip-verify Skip TLS certificate verification (not recommended!)
-t, --trusted-ca-file string TLS CA certificate bundle in PEM format
-T, --timeout int Request timeout in seconds (default 15)
-h, --help help for http-json
Use "http-json [command] --help" for more information about a command.
Queries are written in jq format as implemented by the gojq library.
The query is used to obtain a value in the JSON requested from the URL
specified by --url
. This value is then evaluated against the expression
provided by --expression
.
# Boolean example - checking Sensu cluster health
http-json --url http://backend:8080/health --query ".ClusterHealth.[0].Healthy" --expression "== true"
http-json OK: The value true found at .ClusterHealth.[0].Healthy matched with expression "== true" and returned true
# String comparison expressions
http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --query .id --expression "== \"HeaFdiyIJe\""
http-json OK: The value HeaFdiyIJe found at .id matched with expression "== \"HeaFdiyIJe\"" and returned true
http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --query .id --expression "== \"BadText\""
http-json CRITICAL: The value HeaFdiyIJe found at .id did not match with expression "== \"BadText\"" and returned false
# Numeric comparison expressions
http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --query .status --expression "== 200"
http-json OK: The value 200 found at .status matched with expression "== 200" and returned true
http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --query .status --expression "< 300"
http-json OK: The value 200 found at .status matched with expression "< 300" and returned true
http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --query .status --expression "> 300"
http-json CRITICAL: The value 200 found at .status did not match with expression "> 300" and returned false
# With a custom header
http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --query .status --expression "< 300" --header "Custom-Header: Custom header value"
http-json OK: The value 200 found at .status matched with expression "< 300" and returned true
HTTP GET Check
Usage:
http-get [flags]
http-get [command]
Available Commands:
help Help about any command
version Print the version number of this plugin
Flags:
-H, --header strings Additional header(s) to send in check request
-h, --help help for http-get
-i, --insecure-skip-verify Skip TLS certificate verification (not recommended!)
-C, --mtls-cert-file string Certificate file for mutual TLS auth in PEM format
-K, --mtls-key-file string Key file for mutual TLS auth in PEM format
-T, --timeout int Request timeout in seconds (default 15)
-t, --trusted-ca-file string TLS CA certificate bundle in PEM format
-u, --url string URL to get (default "http://localhost:80/")
Use "http-get [command] --help" for more information about a command.
http-get
CheckThis check is intended to provide a Sensu-native way of fetching the output
of a HTTP GET request against a metrics endpoint, so that those metrics
can be processed by Sensu's output_metrics_threshold
features.
While this functionality is overlapped by default tools like wget
, curl
,
and Windows's Invoke-WebRequest
PowerShell commandlet, this provides a
cross-platform solution to fetching these HTTP-accessible metrics in a
Sensu-native context.
This plugin will result in a critical exit status code if the body is empty
or if the HTTP GET request fails.
# Prometheus node_exporter example - fetching Prometheus metrics from node_exporter
http-get --url http://localhost:9100
[... output is the metrics in Prometheus format ...]
Sensu Assets are the best way to make use of this plugin. If you're not
using an asset, please consider doing so! If you're using sensuctl 5.13 with
Sensu Backend 5.13 or later, you can use the following command to add the asset:
sensuctl asset add nixwiz/http-checks
If you're using an earlier version of sensuctl, you can find the asset on the Bonsai Asset Index.
---
type: CheckConfig
api_version: core/v2
metadata:
name: http-check
namespace: default
spec:
command: http-check --url http://example.com
subscriptions:
- system
runtime_assets:
- nixwiz/http-checks
---
type: CheckConfig
api_version: core/v2
metadata:
name: http-perf
namespace: default
spec:
command: http-perf --url http://example.com
subscriptions:
- system
runtime_assets:
- nixwiz/http-checks
output_metric_format: nagios_perfdata
output_metric-handlers:
- influxdb
---
type: CheckConfig
api_version: core/v2
metadata:
name: http-json
namespace: default
spec:
command: http-json --url https://icanhazdadjoke.com/j/HeaFdiyIJe --path id --expression "== \"HeaFdiyIJe\""
subscriptions:
- system
runtime_assets:
- nixwiz/http-checks
---
type: CheckConfig
api_version: core/v2
metadata:
name: prometheus-node-exporter
namespace: default
spec:
command: http-get --url http://localhost:9100
subscriptions:
- system
runtime_assets:
- sensu/http-checks:0.6.0
output_metrics_format: prometheus_text
output_metric_handlers:
- metrics
output_metric_tags:
- name: entity
value: "{{ .name }}"
The preferred way of installing and deploying this plugin is to use it as an
Asset. If you would like to compile and install the plugin from source or
contribute to it, download the latest version or create an executable script
from this source.
From the local path of the http-checks repository:
go build -o bin/http-check ./cmd/http-check
go build -o bin/http-perf ./cmd/http-perf
go build -o bin/http-json ./cmd/http-json
go build -o bin/http-get ./cmd/http-get
For more information about contributing to this plugin, see Contributing.
Please describe the reason for reporting this asset. Our moderators will be notified and will disable the asset if it is found to be inappropriate.
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