This can be easily achieved on a linux server with the help of a cronjob.
Open up your terminal and edit your cronjobs list using sudo crontab -e.
# Run once every minute * * * * * /usr/bin/wget "www.example.com/testfile.php" --timeout 30 -O - 2>/dev/null | grep "Success text here" || /etc/init.d/mysql start * * * * * service mysql status || service mysql start
Save with Ctrl+X -> Y -> Enter.
Multiple Services
You can also chain multiple service commands using ‘&&’ to execute if the prior command has completed successfully.
* * * * * /usr/bin/wget "www.example.com/testfile.html" --timeout 30 -O - 2>/dev/null | grep "success string" || /etc/init.d/apache2 start && /etc/init.d/hhvm start
Send Notification Email
You can also set it to send you an email if you want to be notified of the issue.
* * * * * /usr/bin/wget "www.example.com/testfile.php" --timeout 30 -O - 2>/dev/null | grep "Success text here" || /etc/init.d/mysql start | /usr/bin/mail -v -s "Error message here" email@domain.com