How do I run a Node.js application as its own process?

Asked 13/1, 2011 at 14:24 Answered 25/7, 2023 at 18:6

Solved node.js service deployment daemon

205

What is the best way to deploy Node.js?

I have a Dreamhost VPS (that's what they call a VM), and I have been able to install Node.js and set up a proxy. This works great as long as I keep the SSH connection that I started node with open.

Ludwigg answered 13/1, 2011 at 14:24 Comment(6)

Hmm, it seems strange to me that you call using Forever as "deploying node.js". Isn't it just a process monitoring/supervision tool? Usually web deployment means (at least what I encounter in articles) several interrelated activities that make a web app available (this process tool being a part of it). Anyway, this is still a great post here in StackOverflow as I've learned from everyone's answers. – Deon 19/8, 2011 at 8:23

This is just the simplest deployment of node.js on Dreamhost. The goal was simply to get node running reliably as a starting point to build from. – Ludwigg 24/8, 2011 at 16:33

How have you handled forwarding the domain to the port node is running on? – Urbanna 22/12, 2012 at 15:56

@Urbanna I use HTTP-Proxy github.com/nodejitsu/node-http-proxy – Ludwigg 8/1, 2013 at 12:50

We are using Elastic Beanstalk now and it is working quite nicely. – Ludwigg 8/11, 2013 at 11:44

Possible duplicate of Node.js as a background service – Doralynn 17/10, 2015 at 13:52

122

2016 answer: nearly every Linux distribution comes with systemd, which means forever, monit, PM2, etc. are no longer necessary - your OS already handles these tasks.

Make a myapp.service file (replacing 'myapp' with your app's name, obviously):

[Unit]
Description=My app

[Service]
ExecStart=/var/www/myapp/app.js
Restart=always
User=nobody
# Note Debian/Ubuntu uses 'nogroup', RHEL/Fedora uses 'nobody'
Group=nogroup
Environment=PATH=/usr/bin:/usr/local/bin
Environment=NODE_ENV=production
WorkingDirectory=/var/www/myapp

[Install]
WantedBy=multi-user.target

Note if you're new to Unix: /var/www/myapp/app.js should have #!/usr/bin/env node on the very first line and have the executable mode turned on chmod +x myapp.js.

Copy your service file into the /etc/systemd/system folder.

Tell systemd about the new service with systemctl daemon-reload.

Start it with systemctl start myapp.

Enable it to run on boot with systemctl enable myapp.

See logs with journalctl -u myapp

This is taken from How we deploy node apps on Linux, 2018 edition, which also includes commands to generate an AWS/DigitalOcean/Azure CloudConfig to build Linux/node servers (including the .service file).

Doralynn answered 16/2, 2015 at 13:6 Comment(8)

Any idea on how to deal with Failed to issue method call: Unit name ... is not valid. ? – Osbert 1/4, 2015 at 18:56

@JulienGenestoux the 'unit' name is the same as your service. It sounds like there's a discrepancy there. After you copied the file to /etc/systemd/system you might need to run systemctl daemon-reload (systemd will normally tell you if this is needed). TBH this is best asked as a separate question. – Doralynn 1/4, 2015 at 19:3

Instead of copying your service file into /etc/systemd/system, you can just use systemctl enable /full/path/to/myapp.service, which creates a symlink in /etc/systemd/system for you. – Priapism 2/4, 2016 at 12:39

How does it compare with pm2? Can it replace pm2 or does pm2 offer more necessary features? – Cyclohexane 30/10, 2016 at 18:45

@Doralynn Can you explain the service line-by-line to a window guy. i mean what ExecStart is the js file but where is node being called . i am confused – Pavior 26/12, 2017 at 18:48

@VinodSrivastav node is called by /var/www/myapp/app.js itself. In Unix, if you make a file executable, and the first line starts with #!/some/file the file will be interpreted with that binary. Google 'interpreter Unix' to know more. – Doralynn 5/1, 2018 at 12:56

You mention systemd only but wasn't it possible to do the same with other Linux init systems? Note that some Linux distributions reject systemd, like Devuan. It would be nice also if someone can answer the question of @SergeiBasharov, how does it compare to pm2? Not using pm2 has an advantage to have less dependencies, here are interesting answers: #4681567 hashnode.com/post/… – Node 23/7, 2019 at 8:14

@baptx: generally if it isn't systemd, it's sysvinit, which means writing a shell script (see /usr/share/doc/svsvinit*) then adding an additional tool to monitor the app and restart it. – Doralynn 23/7, 2019 at 10:47

102

Use Forever. It runs Node.js programs in separate processes and restarts them if any dies.

Usage:

forever start example.js to start a process.
forever list to see list of all processes started by forever
forever stop example.js to stop the process, or forever stop 0 to stop the process with index 0 (as shown by forever list).

Teneshatenesmus answered 13/1, 2011 at 14:37 Comment(6)

This is close. It starts just fine but wont let me stop anything. I was able to log out and back in and then kill the node process. Forever didn't restart it. So I am thinking something about how it works isn't compatible with DH. – Ludwigg 13/1, 2011 at 15:34

@Kevin, you can't kill the node process because Forever itself runs on node! I've added some usage instructions to my answer, including how to stop a process. I've been using this on my VPS and it's worked like a charm. – Teneshatenesmus 13/1, 2011 at 22:32

forever stop 0 had an error and things just kind of fell apart from there. I have been trying to do this without root on its own user so that I can clean up easily once I find the right solution. That may be my problem. I will look into it some more. – Ludwigg 15/1, 2011 at 10:37

I had something wrong with npm that was causing problems. With npm and node installed correctly forever works great. What I ended up doing was adding the forever start commands to a cronjob set to run on restart. I am now working on a little node app that will let me start and stop forever procs. – Ludwigg 21/2, 2011 at 15:35

There's an alternative to Forever which uses node's native cluster API: github.com/superjoe30/naught – Discontinue 18/9, 2013 at 20:2

I don't work on a linux machine, so the top answer was worthless. This answer is the only right one for all OSes that can run node and it's easy to setup and get running right away. Plus, I purposefully ran tests and it restarts the app right away, didn't even notice that it went down for a brief millisecond. – Anatropous 16/11, 2022 at 18:8

I've written about my deployment method here: Deploying node.js apps

In short:

Use git post-receive hook
Jake for the build tool
Upstart as a service wrapper for node
Monit to monitor and restart applications it they go down
nginx to route requests to different applications on the same server

Norris answered 14/4, 2011 at 19:58 Comment(3)

If I will always have a single Node site on my server, can I safely ditch Nginx? – Mortimer 10/4, 2013 at 17:45

The link seems to be broken – Deary 9/6, 2013 at 12:17

@Mortimer I know this is a late reply, but I wouldn't. Apart from things like SSL termination and caching, an nginx reverse proxy in front of the host allows you a greater infrastructural flexibility than running node directly on port 80. It also means you don't have to run node as root, which I think is a pretty heavy argument in favour of the nginx setup. – Nauseating 30/4, 2015 at 13:19

pm2 does the tricks.

Features are: Monitoring, hot code reload, built-in load balancer, automatic startup script, and resurrect/dump processes.

Wornout answered 24/9, 2013 at 1:19 Comment(3)

Is it compatible with services like Heroku? – Peddling 22/5, 2014 at 23:33

@Peddling I dont think It works with heroku, check this article – Wornout 23/5, 2014 at 19:31

This is the best for me. – Ruelu 20/11, 2020 at 22:35

You can use monit, forever, upstart or systemd to start your server.

You can use Varnish or HAProxy instead of Nginx (Nginx is known not to work with websockets).

As a quick and dirty solution you can use nohup node your_app.js & to prevent your app terminating with your server, but forever, monit and other proposed solutions are better.

Torquay answered 10/9, 2011 at 21:21 Comment(1)

A user "Sergey Yarotskiy" tried to edit you post saying that Nginx now supports WebSockets (since version 1.3). I rejected the edit as I think it should be posted as a comment instead. (Otherwise you'd have two contradicting sentences in the same post, which is confusing.) – Campestral 14/2, 2014 at 14:25

I made an Upstart script currently used for my apps:

description "YOUR APP NAME"
author "Capy - http://ecapy.com"

env LOG_FILE=/var/log/node/miapp.log
env APP_DIR=/var/node/miapp
env APP=app.js
env PID_NAME=miapp.pid
env USER=www-data
env GROUP=www-data
env POST_START_MESSAGE_TO_LOG="miapp HAS BEEN STARTED."
env NODE_BIN=/usr/local/bin/node
env PID_PATH=/var/opt/node/run
env SERVER_ENV="production"

######################################################

start on runlevel [2345]
stop on runlevel [016]

respawn
respawn limit 99 5

pre-start script
    mkdir -p $PID_PATH
    mkdir -p /var/log/node
end script

script
    export NODE_ENV=$SERVER_ENV
    exec start-stop-daemon --start --chuid $USER:$GROUP --make-pidfile --pidfile $PID_PATH/$PID_NAME --chdir $APP_DIR --exec $NODE_BIN -- $APP >> $LOG_FILE 2>&1
end script

post-start script
    echo $POST_START_MESSAGE_TO_LOG >> $LOG_FILE
end script

Customize all before #########, create a file in /etc/init/your-service.conf and paste it there.

Then you can:

start your-service
stop your-service
restart your-service
status your-service

Allwein answered 24/4, 2013 at 17:54 Comment(0)

I've written a pretty comprehensive guide to deploying Node.js, with example files:

Tutorial: How to Deploy Node.js Applications, With Examples

It covers things like http-proxy, SSL and Socket.IO.

Ringmaster answered 14/1, 2012 at 20:34 Comment(1)

This looks great. I am using heroku for development and the initial launch but will eventually need to scale past heroku and deploy directly to EC2. I will play with this when I have time. – Ludwigg 15/1, 2012 at 16:46

If you have root access you would better set up a daemon so that it runs safe and sound in the background. You can read how to do just that for Debian and Ubuntu in blog post Run Node.js as a Service on Ubuntu.

Antistrophe answered 13/1, 2011 at 14:31 Comment(1)

I didn't think I had root but it appears that I just have to enable it in the web panel. I will give this a shot. – Ludwigg 13/1, 2011 at 16:32

Here's a longer article on solving this problem with systemd: http://savanne.be/articles/deploying-node-js-with-systemd/

Some things to keep in mind:

Who will start your process monitoring? Forever is a great tool, but it needs a monitoring tool to keep itself running. That's a bit silly, why not just use your init system?
Can you adequately monitor your processes?
Are you running multiple backends? If so, do you have provisions in place to prevent any of them from bringing down the others in terms of resource usage?
Will the service be needed all the time? If not, consider socket activation (see the article).

All of these things are easily done with systemd.

Griselgriselda answered 22/1, 2013 at 6:41 Comment(0)

Forever will do the trick.

@Kevin: You should be able to kill processes fine. I would double check the documentation a bit. If you can reproduce the error it would be great to post it as an issue on GitHub.

Debera answered 14/1, 2011 at 3:55 Comment(1)

Who is Kevin? The OP? – Bosley 26/4, 2016 at 18:30

As Box9 said, Forever is a good choice for production code. But it is also possible to keep a process going even if the SSH connection is closed from the client.

While not necessarily a good idea for production, this is very handy when in the middle of long debug sessions, or to follow the console output of lengthy processes, or whenever is useful to disconnect your SSH connection, but keep the terminal alive in the server to reconnect later (like starting the Node.js application at home and reconnecting to the console later at work to check how things are going).

Assuming that your server is a *nix box, you can use the screen command from the shell to do keep the process running even if the client SSH is closed. You can download/install screen from the web if not already installed (look for a package for your distribution if Linux, or use MacPorts if OS X).

It works as following:

When you first open the SSH connection, type 'screen' - this will start your screen session.
Start working as normal (i.e. start your Node.js application)
When you are done, close your terminal. Your server process(es) will continue running.
To reconnect to your console, ssh back to the server, login, and enter 'screen -r' to reconnect. Your old console context will pop back ready for you to resume using it.
To exit screen, while connected to the server, type 'exit' on the console prompt - that will drop you onto the regular shell.

You can have multiple screen sessions running concurrently like this if you need, and you can connect to any of it from any client. Read the documentation online for all the options.

Marishamariska answered 21/6, 2012 at 7:13 Comment(3)

Good information to have. I agree that it wouldn't work for production but could be very useful when debugging on a remote server. – Ludwigg 21/6, 2012 at 11:19

why not just use nohup node myapp.js & 2>/var/log/myapp.log 1>/dev/null – Tadd 5/10, 2012 at 8:10

I found this av useful youtube.com/watch?v=P4mT5Tbx_KE explaining nohup and forever – Pavior 27/12, 2017 at 14:6

Try this: http://www.technology-ebay.de/the-teams/mobile-de/blog/deploying-node-applications-with-capistrano-github-nginx-and-upstart.html

A great and detailed guide for deploying Node.js apps with Capistrano, Upstart and Nginx

Locker answered 8/11, 2013 at 10:17 Comment(0)

In your case you may use the upstart daemon. For a complete deployment solution, I may suggest capistrano. Two useful guides are How to setup Node.js env and How to deploy via capistrano + upstart.

Suffolk answered 14/1, 2011 at 17:25 Comment(1)

Dead links for the last two – Madcap 14/5, 2014 at 4:50

Forever is a good option for keeping apps running (and it's npm installable as a module which is nice).

But for more serious 'deployment' -- things like remote management of deploying, restarting, running commands etc -- I would use capistrano with the node extension.

https://github.com/loopj/capistrano-node-deploy

Foliation answered 14/2, 2013 at 2:28 Comment(0)

Try node-deploy-server. It is a complex toolset for deploying an application onto your private servers. It is written in Node.js and uses npm for installation.

Arms answered 19/12, 2013 at 9:42 Comment(0)

https://paastor.com is a relatively new service that does the deploy for you, to a VPS or other server. There is a CLI to push code. Paastor has a free tier, at least it did at the time of posting this.

Did answered 21/9, 2014 at 4:13 Comment(0)

I am using express on Dreamhost and got pm2 running on background pm2 start app.js. Convenient. Can view logs and even save log files pm2 logs <PM2_ID> mylogs.txt,

pm2 monit - monitoring metrics of app

pm2 list - table view of processes

You can configure PM2 to automatically restart a process if it exceeds a certain memory usage threshold. This helps prevent memory leaks or excessive memory usage.

pm2 start app.js --name=myapp --max-memory-restart 200M

Disciplinant answered 25/7, 2023 at 18:6 Comment(0)

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