websiteinspector

Bashtool to monitor any websites for HTTP-CODE, TLS-TTL and the HTTP response time. You will get a mail notification for each alarm.

This tool was programmed to monitor all of your websites. The websiteinspector detects automatically if a website uses HTTPS (443) and also checks the expire of the TLS certificate. If the website uses only HTTP (80) the webinspector checks the site without the TLS-TTL.

Requirements:

• SSH access
• Bash as a shell
• A working mailserver
• Tools: mailx to send mails, curl, host and openssl
• Create a cronjob
• Define the variable MAILFROM and MAILTO in websiteinspector
• Enter the URL in the variable WEBSITES.
  • Example for the variable WEBSITES: WEBSITES="https://github.com http://www.postfix.org"

Information:

• You can change in the config_websiteinspector.cnf the values for TLS-WARN, TLS-CRIT and HTTP-RESPONSE-TIME
• The websiteinspector calls a website and expects the 200 HTTP-CODE. Each redirection will be followed until the HTTP-CODE 200 is reached
• If websiteinspector doesn't find a HTTP-CODE 200, this is treated as an error
• If the TLS-TTL (SSL certificate expire date) is lower then 14 days and higher then 7 days this will be handled as warning
• If the TLS-TTL (SSL certificate expire date) is lower then 7 days this will be handled as alarm
• If the website takes longer then 3 seconds to load this will be handled as alarm

Usage:

• Save the websiteinspector.sh on the server which is used to monitor other websites
• Make the websiteinspector.sh executable
• Start the webinspector for the first time, to create his missing configfile
• Modify the configfile config_websiteinspector.cnf for your case. The most important variable that you should adjust is >> WEBSITE <<
• Create a cronjob, that runs every 3 minutes (change this value for your case) and add at the end of the line > /dev/null 2>&1
• Use parameter -s to show only the monitored websites
• Use parameter -v to check the current version
• Use parameter -f to show the current content of alarmlog websiteinspector.log
• Use parameter -r to clear the websiteinspector.log and forget all alarm and warnings
• Use parameter -h to show the usage of websiteinspector.log
• Use parameter -u to update me
• Use parameter -x to show my current settings

Support and contact:

If you use this tool, I would be happy to receive your feedback and your experience with websiteinspector.

To contact me: [email protected]

Cheers