Suppose if you don't want your application to be down even if it crashes, you can use forever. It can be used using command line to restart your application or you can incorporate it as part of your application.
How to use forever using command line
At first you need to install Forever globally like npm install forever -g
then you can use forever command to start your application like
forever [action] [options] SCRIPT [script-options]
where important actions are
start - to start a script
stop - to stop a script
stopall - stop all running forever scripts
restart - restart the script
restartall - restart all running forever scripts
logs - list all logs (all forever process)
cleanlogs - delete all forever log files
list - list all running forever scripts
config - lists all user configuration
where options are like
-m MAX - run script MAX times
-l LOGFILE - logs the output to LOGFILE
-c COMMAND - COMMAND to execute
-s - run the child script silently
-w - watch the file changes
If you want to know the options or actions available you can check using forever --help
Example,
$ forever -m 10 -a -l logFile.log -e errorFile.log serv.js
The above command starts a script serv.js, and specifies name for log file and error log file. Now, if any point of time the script crashes, Forever restarts it. Even if you close the terminal window, forever continues to run in background to ensure that your application restarts every time a crash happens.
How to use forever inside your node application
You can incorporate Forever directly into your node application like below...
var forever = require('forever-monitor');
var childList = new (forever.Monitor)('fileName.js', {
max: 10,
watch: true
});
child.on('exit', this.callback);
child.start();
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