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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$ ./check_http '-u' 'https://www.google.com/' '--ssl' '--onredirect=follow' '-j' 'CONNECT' '--sni' '-p' 'proxy_port' 'myproxyip' 'www.google.com'

For a detailed log, you can use --verbose at the end of the command:

OMD[mysite]:~/lib/nagios/plugins$ ./check_http '-u' 'https://www.google.com/' '--ssl' '--onredirect=follow' '-j' 'CONNECT' '--sni' '-p' 'proxy_port' 'myproxyip' 'www.google.com' --verbose

For more information, you can use --help command flag.

OMD[mysite]:~/lib/nagios/plugins$ ./check_http --help

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In the following example, we are using regular expressions on status.cloud.google.com to gather Access Content Manager information. 

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The service check returns OK

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Running the command by hand can help debug issues as well.

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• 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 → Used to parse particular content from websites. 
• HTTP Method → Set to CONNECT if you're using a proxy
  
  
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Useful Links

Related articles

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