Is there a way to trigger the node server to reload on a command
Something like;
if(checkFirstInCmd("RESTART",cmd){
RESTART.NODE.SERVER
}
There is no built-in way to restart a node server. For example: if a node server crashes it will stop the node process.
One solution that came to my mind was something like a shell script that you could spawn with a child process. The script could kill your server and maybe wait some seconds till it's killed and than restart it again.
Related
I have a NodeJS server written in Typescript, and I'm using supervisor to run this app in the background in production. However, when I type supervisorctl stop myapp, the process stops, but the node process is still running in the background and the site is live. How do I stop the given nodejs process with supervisor?
If supervisorctl stop doesn't stop your node process, you can actually set the stopsignal to one of following values: QUIT, KILL
In the config file '/etc/supervisor/conf.d/*.conf' add the following:
stopsignal=KILL
For more details check this.
I have a node application that sometimes breaks then restart, but after this restart node process of this application Is still running, it can kill my small VPS server when the app will restart a lot of times and I will not kill these process manually.
How can I kill these processes from the node application?
I have a function that restarts the application, so I want to put some code inside this function that will kill this node process before or after starting a new one.
How the node can kill the process by itself?
I mean about something like kill PID or process.kill(PID) - but how can I get the PID of the actual running application?
Sounds like you are trying to kill the Node instance.
process.exit();
In which case, just add process.exit([code]) to the end of your 'start a new server' function.
In a nutshell, process.exit() kills the node app.
For more information:
https://nodejs.org/api/process.html#process_process_exit_code
To get the PID
If you still need the PID; you should be able to get the PID with process.pid; which returns the PID as a Number.
I have an ubuntu server running with 2 node websites on it and I keep closing the terminals that start the app so I cannot shut the app down to make changes, I end up restarting the server.
How can I see what node instances are running and then stop them, or how do I stop a node instance through programming and I'll just make a button that kills the node instance. Either way...
If you dont want to use PM2 or systemd you can get the list of all the node.js instances running using
ps -aux | grep node
once you have the list of all nodejs processes you can kill any process using kill command
kill "Process ID goes here"
Use a process manager. PM2 is the most widely recommended.
npm install pm2#latest -g
then
pm2 start app.js
Alternatively you can use something like screen to have multiple terminal sessions running in one window
I am running a Node.js server on a DigitalOcean droplet (with Ubuntu). I have worked out how to make it run when I'm not connected to it via Putty. However, just one issue: how do I stop it now?
I can see that control+C works when in the session, but what if I exit the session and come back? How will I stop the server then?
Also, will running it multiple times run multiple servers at once?
Thanks!
You really should be using a tool like supervisord (http://supervisord.org/) for your long-running processes.
But if you want to stop an already running process that you started with nohup then look up the process ID first (with ps aux and look/grep for your process) and then run kill <<pid>>.
I am having hard time understanding what is forever in nodejs.
Can someone explain what is forever in simplest way that i can understand and what is the purpose of it
forever is a node.js package that is used to keep the server alive even when the server crash/stops. When the node server is stopped because of some error, exception, etc. forever automatically restarts it
From the npmjs https://www.npmjs.com/package/forever
A simple CLI tool for ensuring that a given node script runs continuously (i.e. forever)
Forever can be used as
forever start app.js
It provides many useful functions which you can see in the link above.
Directly quoting from http://blog.nodejitsu.com/keep-a-nodejs-server-up-with-forever/
The purpose of Forever is to keep a child process (such as your node.js web server) running continuously and automatically restart it when it exits unexpectedly.
Forever basically allows you to run your nodejs application as a process.
Without forever you might type npm start or node index.js to start your application and it will run in your terminal session.
With forever, you can start it off and still have access to your terminal session/close it.
You can even use the nohup command it simply ignores the hang up signal.
node index.js && nohup -& (to run as a background process - no hiccup)