A very simple service that monitors your log files and sends you an email if something goes wrong.

There is a number of configuration parameters that are required by the service to work:

• mail.smtp.host - The SMTP server that will be used to send the e-mail alerts.
• mail.smtp.username - The username to authenticate in the SMTP server.
• mail.smtp.password - The password to authenticate in the SMTP server.
• mail.receiver - The e-mail address where the alerts will be sent.
• mail.sender - The sender of the alert e-mails.
• log.file.locations - The comma-separated list of locations of the log files to be monitored.

All these configuration parameters are mandatory and must be present in a file called .log-monitor, in the user's home directory. If the file does not exist it will be created with a set of default (useless) values.

When the service is run, it simply reads the configured log files and looks for the string [ERROR]. If a log file contains the word, then the service sends the content of the file by email to the configured receiver. After this, it deletes the content of the file.

This is a personal project, and I use it to monitor some services that I have running in my NAS. I am too lazy to check the logs of these services in a regular basis, so I came up with this solution.

If one of the services fails, it will write a [ERROR] trace to its log file. Then, the Log Monitor service, that runs every hour, will find the trace and send me an email with the content of the file. I decided to delete the content of the file after sending the email because I don't really need it anymore.