NodeJS code that pings a list of websites and sends an email alert if at least one is down.
To use this code yourself, update the config.json.SAMPLE file with your websites and your email credentials. Then rename the file to config.json.
To run enter:
node ping
Before the list of hosts are pinged, Google.com is pinged first. If it doesn't respond, then it likely you are disconnected from the Internet. The program quits at this point.
Besides the list of sites to ping, you can adjust these 3 settings.
const slow_seconds = 2;
const attempts = 2;
const seconds_between_attempts = 20;slow_seconds - If you want to be alerted to a site that responds, but is responding slowly, adjust this setting.
attempts - Before sending the alert email, do you want the code to make another attempt to see if sites are up? If so, use this setting.
seconds_between_attempts - If the code makes multiple ping attempts, how many seconds should it wait before trying again?