...
Notice it displays that the Certificate is OK because it will not expire within the next 30 days. In the 'Last Status Text' field it displays the current expiration date.
Appendix A - check_http Use Documentation
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[root@opmantek plugins]# ./check_http --help
check_http v2.1.4 (nagios-plugins 2.1.4)
Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>
Copyright (c) 1999-2014 Nagios Plugin Development Team
<devel@nagios-plugins.org>
This plugin tests the HTTP service on the specified host. It can test
normal (http) and secure (https) servers, follow redirects, search for
strings and regular expressions, check connection times, and report on
certificate expiration times.
Usage:
check_http -H <vhost> | -I <IP-address> [-u <uri>] [-p <port>]
[-J <client certificate file>] [-K <private key>]
[-w <warn time>] [-c <critical time>] [-t <timeout>] [-L] [-E] [-a auth]
[-b proxy_auth] [-f <ok|warning|critcal|follow|sticky|stickyport>]
[-e <expect>] [-d string] [-s string] [-l] [-r <regex> | -R <case-insensitive regex>]
[-P string] [-m <min_pg_size>:<max_pg_size>] [-4|-6] [-N] [-M <age>]
[-A string] [-k string] [-S <version>] [--sni] [-C <warn_age>[,<crit_age>]]
[-T <content-type>] [-j method]
NOTE: One or both of -H and -I must be specified
Options:
-h, --help
Print detailed help screen
-V, --version
Print version information
--extra-opts=[section][@file]
Read options from an ini file. See
https://www.nagios-plugins.org/doc/extra-opts.html
for usage and examples.
-H, --hostname=ADDRESS
Host name argument for servers using host headers (virtual host)
Append a port to include it in the header (eg: example.com:5000)
-I, --IP-address=ADDRESS
IP address or name (use numeric address if possible to bypass DNS lookup).
-p, --port=INTEGER
Port number (default: 80)
-4, --use-ipv4
Use IPv4 connection
-6, --use-ipv6
Use IPv6 connection
-S, --ssl=VERSION[+]
Connect via SSL. Port defaults to 443. VERSION is optional, and prevents
auto-negotiation (2 = SSLv2, 3 = SSLv3, 1 = TLSv1, 1.1 = TLSv1.1,
1.2 = TLSv1.2). With a '+' suffix, newer versions are also accepted.
--sni
Enable SSL/TLS hostname extension support (SNI)
-C, --certificate=INTEGER[,INTEGER]
Minimum number of days a certificate has to be valid. Port defaults to 443
(when this option is used the URL is not checked.)
-J, --client-cert=FILE
Name of file that contains the client certificate (PEM format)
to be used in establishing the SSL session
-K, --private-key=FILE
Name of file containing the private key (PEM format)
matching the client certificate
-e, --expect=STRING
Comma-delimited list of strings, at least one of them is expected in
the first (status) line of the server response (default: HTTP/1.)
If specified skips all other status line logic (ex: 3xx, 4xx, 5xx processing)
-d, --header-string=STRING
String to expect in the response headers
-s, --string=STRING
String to expect in the content
-u, --uri=PATH
URI to GET or POST (default: /)
--url=PATH
(deprecated) URL to GET or POST (default: /)
-P, --post=STRING
URL encoded http POST data
-j, --method=STRING (for example: HEAD, OPTIONS, TRACE, PUT, DELETE, CONNECT)
Set HTTP method.
-N, --no-body
Don't wait for document body: stop reading after headers.
(Note that this still does an HTTP GET or POST, not a HEAD.)
-M, --max-age=SECONDS
Warn if document is more than SECONDS old. the number can also be of
the form "10m" for minutes, "10h" for hours, or "10d" for days.
-T, --content-type=STRING
specify Content-Type header media type when POSTing
-l, --linespan
Allow regex to span newlines (must precede -r or -R)
-r, --regex, --ereg=STRING
Search page for regex STRING
-R, --eregi=STRING
Search page for case-insensitive regex STRING
--invert-regex
Return CRITICAL if found, OK if not
-a, --authorization=AUTH_PAIR
Username:password on sites with basic authentication
-b, --proxy-authorization=AUTH_PAIR
Username:password on proxy-servers with basic authentication
-A, --useragent=STRING
String to be sent in http header as "User Agent"
-k, --header=STRING
Any other tags to be sent in http header. Use multiple times for additional headers
-E, --extended-perfdata
Print additional performance data
-L, --link
Wrap output in HTML link (obsoleted by urlize)
-f, --onredirect=<ok|warning|critical|follow|sticky|stickyport>
How to handle redirected pages. sticky is like follow but stick to the
specified IP address. stickyport also ensures port stays the same.
-m, --pagesize=INTEGER<:INTEGER>
Minimum page size required (bytes) : Maximum page size required (bytes)
-w, --warning=DOUBLE
Response time to result in warning status (seconds)
-c, --critical=DOUBLE
Response time to result in critical status (seconds)
-t, --timeout=INTEGER:<timeout state>
Seconds before connection times out (default: 10)
Optional ":<timeout state>" can be a state integer (0,1,2,3) or a state STRING
-v, --verbose
Show details for command-line debugging (Nagios may truncate output)
Notes:
This plugin will attempt to open an HTTP connection with the host.
Successful connects return STATE_OK, refusals and timeouts return STATE_CRITICAL
other errors return STATE_UNKNOWN. Successful connects, but incorrect reponse
messages from the host result in STATE_WARNING return values. If you are
checking a virtual server that uses 'host headers' you must supply the FQDN
(fully qualified domain name) as the [host_name] argument.
This plugin can also check whether an SSL enabled web server is able to
serve content (optionally within a specified time) or whether the X509
certificate is still valid for the specified number of days.
Please note that this plugin does not check if the presented server
certificate matches the hostname of the server, or if the certificate
has a valid chain of trust to one of the locally installed CAs.
Examples:
CHECK CONTENT: check_http -w 5 -c 10 --ssl -H www.verisign.com
When the 'www.verisign.com' server returns its content within 5 seconds,
a STATE_OK will be returned. When the server returns its content but exceeds
the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,
a STATE_CRITICAL will be returned.
CHECK CERTIFICATE: check_http -H www.verisign.com -C 14
When the certificate of 'www.verisign.com' is valid for more than 14 days,
a STATE_OK is returned. When the certificate is still valid, but for less than
14 days, a STATE_WARNING is returned. A STATE_CRITICAL will be returned when
the certificate is expired.
CHECK CERTIFICATE: check_http -H www.verisign.com -C 30,14
When the certificate of 'www.verisign.com' is valid for more than 30 days,
a STATE_OK is returned. When the certificate is still valid, but for less than
30 days, but more than 14 days, a STATE_WARNING is returned.
A STATE_CRITICAL will be returned when certificate expires in less than 14 days
CHECK SSL WEBSERVER CONTENT VIA PROXY USING HTTP 1.1 CONNECT:
check_http -I 192.168.100.35 -p 80 -u https://www.verisign.com/ -S -j CONNECT -H www.verisign.com
all these options are needed: -I <proxy> -p <proxy-port> -u <check-url> -S(sl) -j CONNECT -H <webserver>
a STATE_OK will be returned. When the server returns its content but exceeds
the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,
a STATE_CRITICAL will be returned.
Send email to help@nagios-plugins.org if you have questions regarding use
of this software. To submit patches or suggest improvements, send email to
devel@nagios-plugins.org
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Appendix B - Debian based systems - command line examples.
Finding the package that contains the subject plugin.
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root@DebTest:~# apt-cache search check_http
monitoring-plugins-basic - Plugins for nagios compatible monitoring systems (basic)
nagios-plugins-contrib - Plugins for nagios compatible monitoring systems |
Installing the package.
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root@DebTest:~# apt-get install monitoring-plugins-basic
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
liboath0 libopenconnect3 libproxy1 libstoken1 libtomcrypt0 libtommath0 vpnc-scripts
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
monitoring-plugins-common
Suggested packages:
icinga icinga nagios3
The following NEW packages will be installed:
monitoring-plugins-basic monitoring-plugins-common
0 upgraded, 2 newly installed, 0 to remove and 81 not upgraded.
Need to get 668 kB of archives.
After this operation, 2,233 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://ftp.kr.debian.org/debian/ jessie/main monitoring-plugins-common amd64 2.1.1-1 [223 kB]
1% [1 monitoring-plugins-common 8,451 B/223 kB 4%]
-- snip |