qmon is a monitoring application suitable for a small number of hosts and services. It aims to be a quick and secure alternative to nagios with focus on security and simplicity.
Features:
- Simple INI-style configuration file
- Powerful macro processor for similar configuration entries
- Nagios-compatibility: Check scripts from the nagios or icinga package can be used with qmon. Multiline output is not supported though.
- Notification via XMPP and others
- CGI-based web frontend
Required packages:
- Tcl 8.6 or 8.5 (8.6 is preferred)
- Tcllib 1.13
- sqlite-tcl
- xmpppy 0.4.1 or 0.5 (optional: for notify_via_xmpp plugin)
- nagios or icinga plugins (optional)
Example package installation with Debian/Ubuntu:
# apt-get install tcl8.6 tcllib libsqlite3-tcl tcl-tls
# apt-get install nagios-plugins-standard nagios-plugins-contrib
# apt-get install python-xmpp
(or) # pip install xmpppy --pre
Example package installation with Activestate Tcl 8.6:
# ln -s /opt/ActiveTcl-8.6/bin/tclsh8.6 /usr/local/bin
# teacup update --only newer ## (!! not 'teacup update'. bad idea.)
# teacup install inifile
# teacup install ncgi
# teacup install html
# teacup install term::ansi::code::ctrl
Create dedicated qmon user and group:
# groupadd qmon
# useradd -g qmon -d /var/run/qmon qmon
# mkdir -p /var/run/qmon
# chown qmon:qmon /var/run/qmon
In /opt clone qmon from github:
# cd /opt
# git clone https://github.com/bef/qmon.git
Configure qmon for use with Tcl 8.5, if Tcl 8.6 is not available: Edit 'qmon' to invoke tclsh8.5:
TCLSH=tclsh8.5
Create initial configuration file etc/qmon.ini (or copy etc/qmon.ini.sample), e.g.
[global]
plugin_path=/opt/qmon/plugins /usr/lib/nagios/plugins
interval=3600
interval_warning=1800
interval_critical=600
interval_unknown=1800
Then create sqlite DB:
# mkdir db
# ./qmon update
# chown -R root:qmon db
# chmod 2775 db
# chmod 664 db/qmon.db
Configure qmon (see below), then
# ./qmon update
Secure sensitive configuration files, e.g.
# chown root:qmon /opt/qmon/etc/*.ini
# chmod 640 /opt/qmon/etc/*.ini
Go live: Edit crontab:
# crontab -u qmon -e
PATH=/usr/local/bin:/usr/bin:/bin
0-59/5 * * * * /opt/qmon/qmon check
Install web-frontend, e.g. with boa add two lines to boa.conf:
ScriptAlias /cgi-bin/qmon /opt/qmon/cgi-bin
Alias /qmon /opt/qmon/htdocs
OR with apache2, copy apache.conf.sample to apache.conf and add this line to a vhost configuration:
Include /opt/qmon/etc/apache.conf
See 'etc/qmon.ini.sample' for a quick start.
Format description:
- qmon.ini consists of INI-style sections (e.g. [test]) with key/value pairs (a=b).
- [global] is reserved for global settings. Other sections are either host descriptions or check descriptions.
- ';' starts a one-line comment.
- type=check can be omitted.
- All values are processed once with variable substitution and backslash substitution, specifically $cfg(...) where ... is 'section.key', e.g. $cfg(ex.hostname)
- Substitutions can be disabled with a ! prefix, e.g. foo=!$bar. This can be useful for notify_cmd, which does runtime substitution, in order to avoid double substitution problems and endless backslash-escaping. Having ! as first character is still possible with \!.
- Every host implicitly sets 'desc' and 'type=host'
- Unless explicitly changed every check sets 'cmd', 'desc', 'host=unknown', 'type=check', 'enabled=1' and various intervals
Example:
[global]
plugin_path=/opt/qmon/plugins /usr/lib/nagios/plugins
interval=3600
interval_warning=1800
interval_critical=600
interval_unknown=1800
;notify_cmd=!echo -e "$name is now $status2 (was $status)" | ${::qmondir}/plugins/notify_via_xmpp [email protected]
[tohu]
type=host
[ex]
type=host
hostname=example.com
ip_pub=...
ip_priv=...
desc=example.com
[ex_ssh]
type=check
host=ex
desc=SSH
cmd=check_ssh -H $cfg(ex.hostname) -4
; enabled=0
The ini-parser comes with a simple, yet powerful macro processor. This is useful for reusing snippets in a way functions or procedures work with programming languages. Example:
#template X %COLOR% %ANIMAL1% %ANIMAL2%
the quick %COLOR% %ANIMAL1% jumps over the lazy %ANIMAL2%
#end template
#use X brown fox dog
This would result in
the quick brown fox jumps over the lazy dog
Template arguments can be any word with or without special characters, e.g. %COLOR%, $color, C, but the %%-syntax avoids accidental substitutions.
Multi-word arguments can be enclosed by "" or {}, e.g. "-h example.com".
Templates can be nested, however mind multi-word arguments:
#template A %1% %2%
#use B {%1%} {%2%}
#end template
#template B %1% %2%
arg1=%1%
arg2=%2%
#end template
[B]
#use B {1 2 -e "foo"} 3 4
[A]
#use A {1 2 -e "foo"} 3 4
Output:
[B]
arg1=1 2 -e "foo"
arg2=3
[A]
arg1=1 2 -e "foo"
arg2=3
The third argument (here '4') is silently discarded.
The launch script 'qmon' may be edited to reflect your installation preferences, such as TCLSH, directories, filenames, e.g.:
QMON=/usr/lib/qmon
TCLSH=/some/obscure/tclsh8.6
EXTRA_ARGS="-ini /etc/qmon/qmon.ini -db /var/lib/qmon/qmon.db -lib /usr/share/qmon/lib"
try 'qmon -h'
This plugin sends arbitrary messages via XMPP. This is probably most useful with the global configuration
notify_cmd=echo -e "$name is now $status2 (was $status)" | ${::qmondir}/plugins/notify_via_xmpp [email protected] [email protected]
Account credentials are in etc/notify_via_xmpp.ini:
[jidparams]
[email protected]/qmon
password=123456
The notification logic is kept simple on purpose. Every state change from a check results in the execution of notify_cmd. Further logic such as notification groups or notify via xmpp and email have or only during work hours ... have to be implemented separately within notify_cmd.
This plugin parses the output of 'netstat -lntu', which shows the listening TCP and UDP ports on linux hosts. A list of 'protocol,IP:port' triplets is then matched against the configuration in the order as configured, but usually 'ok', 'warning', 'critical'.
String pattern may contain wildcards '?', '*' and '[chars]' for 1, >=0 or specific charecters.
Example: 'tcp4,127.0.0.1:80' would be matched by any of the following patterns:
tcp4,127.0.0.1:80
tcp*,*:80
*,127.0.0.1:*
Complete example (keys must be unique but have no meaning):
[global]
order=ok,warning,critical
[ok]
http=tcp*,*:80
https=tcp*,*:443
ignore=*,192.168.250:*
; localhost=*,127.0.0.1:*
samba=*:139
[warning]
localhost=*,127.0.0.1:*
localhost6=*,::1:*
[critical]
catchall=*
Check SMTP server for open relay misconfiguration and greylisting.
Example open relay check:
check_mx -addr 10.0.0.1 openrelay
Example greylisting check:
check_mx -addr 10.0.0.1 -to [email protected] greylisting
Alternative check_http to check for HTTP return code, headers or MD5 of response body.
Example - issue warning if MD5-sum of response body is unexpected:
check_http_q -md5 b01cfa73a80d7b27153b49e917f18747 http://example.com/