How to make a node js application run permanently

Question

On a Debian server  I installed Node js  I understand how to launch an app from putty with this command line   node  srv www MyUserAccount server server js   and get to it on the address 50 51 52 53 8080  IP and port    But as soon as I close putty  then I cannot reach the address 50 51 52 53 8080 anymore   How to make a Node js application run permanently   As you can guess  I am a beginner with Linux and Node js

User · Answer

First install pm2 globally  npm install -g pm2   then start  pm2 start bin www

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You can use PM2  it s a production process manager for Node js applications with a built-in load balancer    Install PM2    npm install pm2 -g   Start an application    pm2 start app js   If you using express then you can start your app like  pm2 start   bin www --name  app    Listing all running processes     pm2 list   It will list all process  You can then stop   restart your service by using ID or Name of the app with following command     pm2 stop all                     pm2 stop 0                       pm2 restart all                  To display logs     pm2 logs   all  app name app id

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You could install forever using npm like this   sudo npm install -g forever   And then start your application with   forever server js   Or as a service   forever start server js   Forever restarts your app when it crashes or stops for some reason  To restrict restarts to 5 you could use   forever -m5 server js   To list all running processes   forever list   Note the integer in the brackets and use it as following to stop a process   forever stop 0   Restarting a running process goes   forever restart 0   If you re working on your application file  you can use the -w parameter to restart automatically whenever your server js file changes   forever -w server js

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forever package worked for me  just one thing  it depends on deep-equal  so if you had issue with installing it like   npm -g install forever   Try   npm -g install forever deep-equal 1 1 1   instead

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nohup working i checked in AWS Ubunto vm follow the correct syntax    ubuntu ip-172-00-00-00   ms  nohup node server js  amp       then press enter you will see this line   ubuntu ip-172-00-00-00   ms  nohup  ignoring input and appending output to    nohup out         then type this   rm nohup out

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Try pm2 to make your application run forever  npm install -g pm2 and then use pm2 start server js to list and stop apps  use commnds pm2 list pm2 stop 0

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Although the other answers solve the OP s problem  they are all overkill and do not explain why he or she is experiencing this issue   The key is this line   I close putty  then I cannot reach the address   When you are logged into your remote host on Putty you have started an SSH linux process and all commands typed from that SSH session will be executed as children of said process     Your problem is that when you close Putty you are exiting the SSH session which kills that process and any active child processes   When you close putty you inadvertently kill your server because you ran it in the foreground   To avoid this behavior run the server in the background by appending  amp  to your command    node  srv www MyUserAccount server server js  amp    The problem here is a lack of linux knowledge and not a question about node   For some more info check out  http   linuxconfig org understanding-foreground-and-background-linux-processes  UPDATE   As others have mentioned  the node server may still die when exiting the terminal   A common gotcha I have come across is that even though the node process is running in bg  it s stdout and stderr is still pointed at the terminal   This means that if the node server writes to console log or console error it will receive a broken pipe error and crash   This can be avoided by piping the output of your process   node  srv www MyUserAccount server server js  gt  stdout txt 2 gt  stderr txt  amp    If the problem persists then you should look into things like tmux or nohup  which are still more robust than node specific solutions  because they can be used to run all types of processes  databases  logging services  other languages    A common mistake that could cause the server to exit is that after running the nohup node your path server js  amp  you simply close the Putty terminal by a simple click  You should use exit command instead  then your node server will be up and running

User · Answer

I hope this will help you   At the command line  install forever     npm install forever -g   Create an example file   sudo nano server js    You can edit the file and get results directly in your browser  You can use filezilla or any editor to edit the file   Run this command to run the file     forever start --minUptime 1 --spinSleepTime 1000 -w server js

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Another way is creating a system unit for your app  create a  XXX service  file in   etc systemd system  folder  similar to this    Unit  Description swagger After network target   Service  ExecStart  usr bin http-server  home swagger swagger-editor  amp  WorkingDirectory  home swagger Restart always RestartSec 30   Install  WantedBy multi-user target   A benefit is the app will run as a service  it automatically restarts if it crashed    You can also use sytemctl to manage it   systemctl start XXX to start the service  systemctl stop XXX to stop it and systemctl enable XXX to automatically start the app when system boots

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No need to install any other package   Run this command   node server js  gt  stdout txt 2 gt  stderr txt  amp    server js is your server file or it can be api js  After that hit  exit  to close terminal  exit

User · Answer

Forever is a very good NodeJs module to do exactly that   Install forever by typing in the command line    npm install forever -g   Then use the following command to run a node js script    forever start  path to script js   You are good to go  Additionally you can run    forever list   to see all the running scripts  You can terminate any specific script by typing    forever stop  pid    where  pid  is the process ID of the script you will obtain from the list command  To stop all scripts  you may type    forever stopall

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Here s an upstart solution I ve been using for my personal projects   Place it in  etc init node app daemon conf   description  Node js Daemon  author       Adam Eberlin   stop on shutdown  respawn respawn limit 3 15  script   export APP HOME   srv www MyUserAccount server    cd  APP HOME   exec sudo -u user  usr bin node server js end script   This will also handle respawning your application in the event that it crashes  It will give up attempts to respawn your application if it crashes 3 or more times in less than 15 seconds

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Installation        sudo  npm install forever -g   You can use forever to run scripts continuously  forever start server js  forever list   for stop service   forever stop server js

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If you just want to run your node app in the terminal always  just use screen   Install on ubuntu  debian   sudo apt-get install screen   Usage     screen   node  path to app js   ctrl   a and then ctrl   d to dismiss  To get is back   One screen  screen -r  If there s more than one you can list all the screens with  screen -ls  And then  screen -r pid number

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I d recommend looking for something such as Forever to restart Node in the event of a crash  and handle daemonizing this for you

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During development  I recommend using nodemon  It will restart your server whenever a file changes  As others have pointed out  Forever is an option but in production  it all depends on the platform you are using  You will typically want to use the operating system s recommended way of keeping services up  e g  http   www freedesktop org wiki Software systemd

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I   ve found forever to do the job perfectly fine   Assuming you already have npm installed  if not  just do  sudo apt-get install npm   Then install forever  npm install forever --global   Now you can run it like this  forever start app js   https   codingweb io run-nodejs-application-background

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I recommend use PM2  which is a process manager for Node js applications  PM2 provides an easy way to manage and daemonize applications  run them as a service    refer this link - https   www digitalocean com community tutorials how-to-set-up-a-node-js-application-for-production-on-centos-7

User · Answer

You could simply use this   nohup node  srv www MyUserAccount server server js  amp    This will keep the application running and to shut it down you will have to kill it   For that you could install htop and then search for node and then kill it

[node.js] How to make a node.js application run permanently?

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