Check mod-qos-stats

Overview

mod_qos for Apache httpd features a handler showing the current connection and request status. This check fetches the machine-readable version of the status information.

Due to the behavior of mod_qos, this check does not issue a warning, since mod_qos adds waiting times in the event of overuse, for example. The check is useful for statistical purposes and for visualization over time, e.g. in Grafana.

Fact Sheet

Check Plugin Download	https://github.com/Linuxfabrik/monitoring-plugins/tree/main/check-plugins/mod-qos-stats
Check Interval Recommendation	Once a minute
Can be called without parameters	Yes
Compiled for	Linux, Windows
Requirements	Enable mod_qos and configure a Location for SetHandler qos-viewer

Help

usage: mod-qos-stats [-h] [-V] [--always-ok] [--insecure] [--no-proxy]
                     [--test TEST] [--timeout TIMEOUT] [-u URL]

mod_qos for Apache httpd features a handler showing the current connection and
request status. This check fetches the machine-readable version of the status
information.

options:
  -h, --help         show this help message and exit
  -V, --version      show program's version number and exit
  --always-ok        Always returns OK.
  --insecure         This option explicitly allows to perform "insecure" SSL
                     connections. Default: False
  --no-proxy         Do not use a proxy. Default: False
  --test TEST        For unit tests. Needs "path-to-stdout-file,path-to-
                     stderr-file,expected-retc".
  --timeout TIMEOUT  Network timeout in seconds. Default: 8 (seconds)
  -u, --url URL      mod_qos Status URL. Default: http://localhost/qos-status

Usage Examples

./mod-qos-stats --url http://webserver/qos-status

Output:

Everything is ok.

Type Host              Port Key                                   Configured Current
---- ----              ---- ---                                   ---------- -------
base proxy.example.com 0    QS_AllConn (All)                      None       381
virt www.example.com   443  QS_LocRequestLimitMatch ([^.*$])      90         3
virt www.example.com   443  QS_LocKBytesPerSecLimitMatch ([^.*$]) 1250       14
virt www.example.com   443  QS_CondLocRequestLimitMatch ([^.*$])  1          3
virt www.example.com   443  QS_SrvMaxConn ([])                    100        0

States

• Always returns OK.

Perfdata / Metrics

Depends on your mod_qos configuration. The configuration options are suffixed by their specified request pattern (path and query). For example:

• QS_AllConn_All
• QS_CondLocRequestLimitMatch_[^.*$]
• QS_LocKBytesPerSecLimitMatch_[^.*$]
• QS_LocRequestLimitMatch_[^.*$]
• QS_SrvMaxConn_[]

Credits, License

• Authors: Linuxfabrik GmbH, Zurich
• License: The Unlicense, see LICENSE file.