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| 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. |
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check_http has many valuable configuration options. Please click here for some of the more common ones. |
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DebuggingDebugging
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In the following examples, you will see references to myproxyip and proxy_port. Please replace this information with your own proxy IP and port number. |
Debugging with curl
If you have trouble using check_http, you can start to query the URL with curl:
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curl -x 173.212.220.96:3128myproxyip:proxy_port https://www.google.decom/ --verbose |
Execute the active Check manually
There are several ways to access the command. One way is described here: Configuring Check Email (check_mail)#ExecuteactiveCheckmanually
One other way is with cmk -N:
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OMD[mysite]:~/lib/nagios/plugins$ cmk -N |grep http check_command check_mk_active-http!'-u' 'https://www.google.decom/' '--ssl' '--onredirect=follow' '-j' 'CONNECT' '--sni' '-p' '3128proxy_port' '173.212.220.96myproxyip' 'www.google.decom' command_line /omd/sites/cme2mysite/lib/nagios/plugins/check_http $ARG1$ command_name check_mk_active-http -> |
cmk
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A second way to access the command is via livestatus:
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OMD[mysite]:~/lib/nagios/plugins$ lq "GET services\nColumns:host_name description check_command_expanded\nFilter: host_name = localhostmysite\nFilter: description = HTTPS HTTPSmyservicename" localhost;HTTPS HTTPS;check_mk_active-http!'-u' 'https://www.google.decom/' '--ssl' '--onredirect=follow' '-j' 'CONNECT' '--sni' '-p' '3128proxy_port' '173.212.220.96myproxyip' 'www.google.de' -> In both com' |
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command later.
Now you need to run the check_http and paste the copied parameters:
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OMD[mysite]:~/lib/nagios/plugins$ ./check_http '-u' 'https://www.google.decom/' '--ssl' '--onredirect=follow' '-j' 'CONNECT' '--sni' '-p' '3128proxy_port' '173.212.220.96myproxyip' 'www.google.decom' |
For a detailed log, you can use --verbose at the end of the command:
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OMD[mysite]:~/lib/nagios/plugins$ ./check_http '-u' 'https://www.google.decom/' '--ssl' '--onredirect=follow' '-j' 'CONNECT' '--sni' '-p' '3128proxy_port' '173.212.220.96myproxyip' 'www.google.decom' --verbose |
For more information, you can use --help command flag.
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OMD[mysite]:~/lib/nagios/plugins$ ./check_http --help |
Debugging Regular Expressions (Regex)
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Information on errors with JavascriptIf there is any client-side or Javascript-related content, Checkmk will not be able to parse this information with regular expressions. |
In the following example, we are using regular expressions on status.cloud.google.com to gather Access Content Manager information.
The service check returns OK
Running the command by hand can help debug issues as well.
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OMD[mysite]:~/lib/nagios/plugins$ ./check_http -u /regional/americas --ssl -l -R 'Access Context Manager' --sni -I status.cloud.google.com -H status.cloud.google.com
HTTP OK: HTTP/1.1 200 OK - 584329 bytes in 4.511 second response time |time=4.511160s;;;0.000000;10.000000 size=584329B;;;0; |
Some important options
- Address (name / IP or Proxy) → If you need a proxy to access the domain
- Virtual host → is necessary if you have multiple domains and one host running
- How to handle redirect → How to handle redirected pages
- Regular Expression to expect in content →
- content → Used to parse particular content from websites.
- HTTP Method → Set to CONNECT if you're using a proxy
Useful Links
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Related articles
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