Since this post has gotten a lot of attention over the years, I've listed the top solutions per platform at the bottom of this post.
Original post:
I want my node.js server to run in the background, i.e.: when I close my terminal I want my server to keep running. I've googled this and came up with this tutorial, however it doesn't work as intended. So instead of using that daemon script, I thought I just used the output redirection (the 2>&1 >> file part), but this too does not exit - I get a blank line in my terminal, like it's waiting for output/errors.
I've also tried to put the process in the background, but as soon as I close my terminal the process is killed as well.
So how can I leave it running when I shut down my local computer?
Top solutions:
Systemd (Linux)
Launchd (Mac)
node-windows (Windows)
PM2 (Node.js)
Copying my own answer from How do I run a Node.js application as its own process?
2015 answer: nearly every Linux distro 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 app.js.
Copy your service file into the /etc/systemd/system.
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).
You can use Forever, A simple CLI tool for ensuring that a given node script runs continuously (i.e. forever):
https://www.npmjs.org/package/forever
UPDATE - As mentioned in one of the answers below, PM2 has some really nice functionality missing from forever. Consider using it.
Original Answer
Use nohup:
nohup node server.js &
EDIT I wanted to add that the accepted answer is really the way to go. I'm using forever on instances that need to stay up. I like to do npm install -g forever so it's in the node path and then just do forever start server.js
This might not be the accepted way, but I do it with screen, especially while in development because I can bring it back up and fool with it if necessary.
screen
node myserver.js
>>CTRL-A then hit D
The screen will detach and survive you logging off. Then you can get it back back doing screen -r. Hit up the screen manual for more details. You can name the screens and whatnot if you like.
2016 Update:
The node-windows/mac/linux series uses a common API across all operating systems, so it is absolutely a relevant solution. However; node-linux generates systemv init files. As systemd continues to grow in popularity, it is realistically a better option on Linux. PR's welcome if anyone wants to add systemd support to node-linux :-)
Original Thread:
This is a pretty old thread now, but node-windows provides another way to create background services on Windows. It is loosely based on the nssm concept of using an exe wrapper around your node script. However; it uses winsw.exe instead and provides a configurable node wrapper for more granular control over how the process starts/stops on failures. These processes are available like any other service:
The module also bakes in some event logging:
Daemonizing your script is accomplished through code. For example:
var Service = require('node-windows').Service;
// Create a new service object
var svc = new Service({
name:'Hello World',
description: 'The nodejs.org example web server.',
script: 'C:\\path\\to\\my\\node\\script.js'
});
// Listen for the "install" event, which indicates the
// process is available as a service.
svc.on('install',function(){
svc.start();
});
// Listen for the "start" event and let us know when the
// process has actually started working.
svc.on('start',function(){
console.log(svc.name+' started!\nVisit http://127.0.0.1:3000 to see it in action.');
});
// Install the script as a service.
svc.install();
The module supports things like capping restarts (so bad scripts don't hose your server) and growing time intervals between restarts.
Since node-windows services run like any other, it is possible to manage/monitor the service with whatever software you already use.
Finally, there are no make dependencies. In other words, a straightforward npm install -g node-windows will work. You don't need Visual Studio, .NET, or node-gyp magic to install this. Also, it's MIT and BSD licensed.
In full disclosure, I'm the author of this module. It was designed to relieve the exact pain the OP experienced, but with tighter integration into the functionality the Operating System already provides. I hope future viewers with this same question find it useful.
If you simply want to run the script uninterrupted until it completes you can use nohup as already mentioned in the answers here. However, none of the answers provide a full command that also logs stdin and stdout.
nohup node index.js >> app.log 2>&1 &
The >> means append to app.log.
2>&1 makes sure that errors are also send to stdout and added to the app.log.
The ending & makes sure your current terminal is disconnected from command so you can continue working.
If you want to run a node server (or something that should start back up when the server restarts) you should use systemd / systemctl.
UPDATE: i updated to include the latest from pm2:
for many use cases, using a systemd service is the simplest and most appropriate way to manage a node process. for those that are running numerous node processes or independently-running node microservices in a single environment, pm2 is a more full featured tool.
https://github.com/unitech/pm2
http://pm2.io
it has a really useful monitoring feature -> pretty 'gui' for command line monitoring of multiple processes with pm2 monit or process list with pm2 list
organized Log management -> pm2 logs
other stuff:
Behavior configuration
Source map support
PaaS Compatible
Watch & Reload
Module System
Max memory reload
Cluster Mode
Hot reload
Development workflow
Startup Scripts
Auto completion
Deployment workflow
Keymetrics monitoring
API
Try to run this command if you are using nohup -
nohup npm start 2>/dev/null 1>/dev/null&
You can also use forever to start server
forever start -c "npm start" ./
PM2 also supports npm start
pm2 start npm -- start
If you are running OSX, then the easiest way to produce a true system process is to use launchd to launch it.
Build a plist like this, and put it into the /Library/LaunchDaemons with the name top-level-domain.your-domain.application.plist (you need to be root when placing it):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>top-level-domain.your-domain.application</string>
<key>WorkingDirectory</key>
<string>/your/preferred/workingdirectory</string>
<key>ProgramArguments</key>
<array>
<string>/usr/local/bin/node</string>
<string>your-script-file</string>
</array>
<key>RunAtLoad</key>
<true/>
<key>KeepAlive</key>
<true/>
</dict>
</plist>
When done, issue this (as root):
launchctl load /Library/LaunchDaemons/top-level-domain.your-domain.application.plist
launchctl start top-level-domain.your-domain.application
and you are running.
And you will still be running after a restart.
For other options in the plist look at the man page here: https://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man5/launchd.plist.5.html
I am simply using the daemon npm module:
var daemon = require('daemon');
daemon.daemonize({
stdout: './log.log'
, stderr: './log.error.log'
}
, './node.pid'
, function (err, pid) {
if (err) {
console.log('Error starting daemon: \n', err);
return process.exit(-1);
}
console.log('Daemonized successfully with pid: ' + pid);
// Your Application Code goes here
});
Lately I'm also using mon(1) from TJ Holowaychuk to start and manage simple node apps.
I use Supervisor for development. It just works. When ever you make changes to a .js file Supervisor automatically restarts your app with those changes loaded.
Here's a link to its Github page
Install :
sudo npm install supervisor -g
You can easily make it watch other extensions with -e. Another command I use often is -i to ignore certain folders.
You can use nohup and supervisor to make your node app run in the background even after you log out.
sudo nohup supervisor myapp.js &
Node.js as a background service in WINDOWS XP
Kudos goes to Hacksparrow at: http://www.hacksparrow.com/install-node-js-and-npm-on-windows.html for tutorial installing Node.js + npm for windows.
Kudos goes to Tatham Oddie at: http://blog.tatham.oddie.com.au/2011/03/16/node-js-on-windows/ for nnsm.exe implementation.
Installation:
Install WGET http://gnuwin32.sourceforge.net/packages/wget.htm via installer executable
Install GIT http://code.google.com/p/msysgit/downloads/list via installer executable
Install NSSM http://nssm.cc/download/?page=download via copying nnsm.exe into %windir%/system32 folder
Create c:\node\helloworld.js
// http://howtonode.org/hello-node
var http = require('http');
var server = http.createServer(function (request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
response.end("Hello World\n");
});
server.listen(8000);
console.log("Server running at http://127.0.0.1:8000/");
Open command console and type the following (setx only if Resource Kit is installed)
C:\node> set path=%PATH%;%CD%
C:\node> setx path "%PATH%"
C:\node> set NODE_PATH="C:\Program Files\nodejs\node_modules"
C:\node> git config --system http.sslcainfo /bin/curl-ca-bundle.crt
C:\node> git clone --recursive git://github.com/isaacs/npm.git
C:\node> cd npm
C:\node\npm> node cli.js install npm -gf
C:\node> cd ..
C:\node> nssm.exe install node-helloworld "C:\Program Files\nodejs\node.exe" c:\node\helloworld.js
C:\node> net start node-helloworld
A nifty batch goodie is to create c:\node\ServiceMe.cmd
#echo off
nssm.exe install node-%~n1 "C:\Program Files\nodejs\node.exe" %~s1
net start node-%~n1
pause
Service Management:
The services themselves are now accessible via Start-> Run->
services.msc or via Start->Run-> MSCONFIG-> Services (and check 'Hide
All Microsoft Services').
The script will prefix every node made via the batch script with
'node-'.
Likewise they can be found in the registry: "HKLM\SYSTEM\CurrentControlSet\Services\node-xxxx"
The accepted answer is probably the best production answer, but for a quick hack doing dev work, I found this:
nodejs scriptname.js & didn't work, because nodejs seemed to gobble up the &, and so the thing didn't let me keep using the terminal without scriptname.js dying.
But I put nodejs scriptname.js in a .sh file, and
nohup sh startscriptname.sh & worked.
Definitely not a production thing, but it solves the "I need to keep using my terminal and don't want to start 5 different terminals" problem.
June 2017 Update:
Solution for Linux: (Red hat). Previous comments doesn't work for me.
This works for me on Amazon Web Service - Red Hat 7. Hope this works for somebody out there.
A. Create the service file
sudo vi /etc/systemd/system/myapp.service
[Unit]
Description=Your app
After=network.target
[Service]
ExecStart=/home/ec2-user/meantodos/start.sh
WorkingDirectory=/home/ec2-user/meantodos/
[Install]
WantedBy=multi-user.target
B. Create a shell file
/home/ec2-root/meantodos/start.sh
#!/bin/sh -
sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to 8080
npm start
then:
chmod +rx /home/ec2-root/meantodos/start.sh
(to make this file executable)
C. Execute the Following
sudo systemctl daemon-reload
sudo systemctl start myapp
sudo systemctl status myapp
(If there are no errors, execute below. Autorun after server restarted.)
chkconfig myapp -add
If you are running nodejs in linux server, I think this is the best way.
Create a service script and copy to /etc/init/nodejs.conf
start service: sudo service nodejs start
stop service: sudo service nodejs stop
Sevice script
description "DManager node.js server - Last Update: 2012-08-06"
author "Pedro Muniz - pedro.muniz#geeklab.com.br"
env USER="nodejs" #you have to create this user
env APPNAME="nodejs" #you can change the service name
env WORKDIR="/home/<project-home-dir>" #set your project home folder here
env COMMAND="/usr/bin/node <server name>" #app.js ?
# used to be: start on startup
# until we found some mounts weren't ready yet while booting:
start on started mountall
stop on shutdown
# Automatically Respawn:
respawn
respawn limit 99 5
pre-start script
sudo -u $USER echo "[`date -u +%Y-%m-%dT%T.%3NZ`] (sys) Starting" >> /var/log/$APPNAME.log
end script
script
# Not sure why $HOME is needed, but we found that it is:
export HOME="<project-home-dir>" #set your project home folder here
export NODE_PATH="<project node_path>"
#log file, grant permission to nodejs user
exec start-stop-daemon --start --make-pidfile --pidfile /var/run/$APPNAME.pid --chuid $USER --chdir $WORKDIR --exec $COMMAND >> /var/log/$APPNAME.log 2>&1
end script
post-start script
# Optionally put a script here that will notifiy you node has (re)started
# /root/bin/hoptoad.sh "node.js has started!"
end script
pre-stop script
sudo -u $USER echo "[`date -u +%Y-%m-%dT%T.%3NZ`] (sys) Stopping" >> /var/log/$APPNAME.log
end script
use nssm the best solution for windows, just download nssm, open cmd to nssm directory and type
nssm install <service name> <node path> <app.js path>
eg: nssm install myservice "C:\Program Files\nodejs" "C:\myapp\app.js"
this will install a new windows service which will be listed at services.msc from there you can start or stop the service, this service will auto start and you can configure to restart if it fails.
Use pm2 module. pm2 nodejs module
Since I'm missing this option in the list of provided answers I'd like to add an eligible option as of 2020: docker or any equivalent container platform. In addition to ensuring your application is working in a stable environment there are additional security benefits as well as improved portability.
There is docker support for Windows, macOS and most/major Linux distributions. Installing docker on a supported platform is rather straight-forward and well-documented. Setting up a Node.js application is as simple as putting it in a container and running that container while making sure its being restarted after shutdown.
Create Container Image
Assuming your application is available in /home/me/my-app on that server, create a text file Dockerfile in folder /home/me with content similar to this one:
FROM node:lts-alpine
COPY /my-app/ /app/
RUN cd /app && npm ci
CMD ["/app/server.js"]
It is creating an image for running LTS version of Node.js under Alpine Linux, copying the application's files into the image and runs npm ci to make sure dependencies are matching that runtime context.
Create another file .dockerignore in same folder with content
**/node_modules
This will prevent existing dependencies of your host system from being injected into container as they might not work there. The presented RUN command in Dockerfile is going to fix that.
Create the image using command like this:
docker build -t myapp-as-a-service /home/me
The -t option is selecting the "name" of built container image. This is used on running containers below.
Note: Last parameter is selecting folder containing that Dockerfile instead of the Dockerfile itself. You may pick a different one using option -f.
Start Container
Use this command for starting the container:
docker run -d --restart always -p 80:3000 myapp-as-a-service
This command is assuming your app is listening on port 3000 and you want it to be exposed on port 80 of your host.
This is a very limited example for sure, but it's a good starting point.
To round out the various options suggested, here is one more: the daemon command in GNU/Linux, which you can read about here: http://libslack.org/daemon/manpages/daemon.1.html. (apologies if this is already mentioned in one of the comments above).
Check out fugue! Apart from launching many workers, you can demonize your node process too!
http://github.com/pgte/fugue
PM2 is a production process manager for Node.js applications with a built-in load balancer. It allows you to keep applications alive forever, to reload them without downtime and to facilitate common system admin tasks.
https://github.com/Unitech/pm2
I am surprised that nobody has mentioned Guvnor
I have tried forever, pm2, etc. But, when it comes to solid control and web based performance metrics, I have found Guvnor to be by far the best. Plus, it is also fully opensource.
Edit : However, I am not sure if it works on windows. I've only used it on linux.
has anyone noticed a trivial mistaken of the position of "2>&1" ?
2>&1 >> file
should be
>> file 2>&1
I use tmux for a multiple window/pane development environment on remote hosts. It's really simple to detach and keep the process running in the background. Have a look at tmux
For people using newer versions of the daemon npm module - you need to pass file descriptors instead of strings:
var fs = require('fs');
var stdoutFd = fs.openSync('output.log', 'a');
var stderrFd = fs.openSync('errors.log', 'a');
require('daemon')({
stdout: stdoutFd,
stderr: stderrFd
});
If you are using pm2, you can use it with autorestart set to false:
$ pm2 ecosystem
This will generate a sample ecosystem.config.js:
module.exports = {
apps: [
{
script: './scripts/companies.js',
autorestart: false,
},
{
script: './scripts/domains.js',
autorestart: false,
},
{
script: './scripts/technologies.js',
autorestart: false,
},
],
}
$ pm2 start ecosystem.config.js
I received the following error when using #mikemaccana's accepted answer on a RHEL 8 AWS EC2 instance: (code=exited, status=216/GROUP)
It was due to using the user/group set to: 'nobody'.
Upon googling, it seems that using user/group as 'nobody'/'nogroup' is bad practice for daemons as answered here on the unix stack exchange.
It worked great after I set user/group to my actual user and group.
You can enter whomai and groups to see your available options to fix this.
My service file for a full stack node app with mongodb:
[Unit]
Description=myapp
After=mongod.service
[Service]
ExecStart=/home/myusername/apps/myapp/root/build/server/index.js
Restart=always
RestartSec=30
User=myusername
Group=myusername
Environment=PATH=/usr/bin:/usr/local/bin
Environment=NODE_ENV=production
WorkingDirectory=/home/myusername/apps/myapp
[Install]
WantedBy=multi-user.target
In case, for local development purpose, you need to start multiple instances of NodeJS app (express, fastify, etc.) then the concurrently might be an option. Here is a setup:
Prerequesites
Your NodeJS app (express, fastify, etc.) is placed at /opt/mca/www/mca-backend/app path.
Assuming that you are using node v.16 installed via brew install node#16
Setup
Install concurrently: npm install -g concurrently
Create a file ~/Library/LaunchAgents/mca.backend.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>mca.backend</string>
<key>LimitLoadToSessionType</key>
<array>
<string>Aqua</string>
<string>Background</string>
<string>LoginWindow</string>
<string>StandardIO</string>
<string>System</string>
</array>
<key>ProgramArguments</key>
<array>
<string>/usr/local/bin/concurrently</string>
<string>--names</string>
<string>dev,prd</string>
<string>--success</string>
<string>all</string>
<string>--kill-others</string>
<string>--no-color</string>
<string>MCA_APP_STAGE=dev node ./server.mjs</string>
<string>MCA_APP_STAGE=prod node ./server.mjs</string>
</array>
<key>RunAtLoad</key>
<true/>
<key>EnvironmentVariables</key>
<dict>
<key>PATH</key>
<string>/usr/local/opt/node#16/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin</string>
</dict>
<key>WorkingDirectory</key>
<string>/opt/mca/www/mca-backend/app</string>
<key>StandardErrorPath</key>
<string>/opt/mca/www/mca-backend/err.log</string>
<key>StandardOutPath</key>
<string>/opt/mca/www/mca-backend/out.log</string>
</dict>
</plist>
Load and run: launchctl bootstrap gui/`id -u` $HOME/Library/LaunchAgents/mca.backend.plist
Get a status: launchctl print gui/`id -u`/mca.backend
Stop: launchctl kill SIGTERM gui/`id -u`/mca.backend
Start/Restart: launchctl kickstart -k -p gui/`id -u`/mca.backend
Unload if not needed anymore: launchctl bootout gui/`id -u`/mca.backend
IMPORTANT: Once you are loaded service with launchctl bootstrap any changes you made in file
~/Library/LaunchAgents/mca.backend.plist won't be in action until you unload the service (by using launchctl bootout)
and then load it again (by using launchctl bootstrap).
Troubleshooting
See launchd logs at: /private/var/log/com.apple.xpc.launchd/launchd.log
This answer is quite late to the party, but I found that the best solution was to write a shell script that used the both the screen -dmS and nohup commands.
screen -dmS newScreenName nohup node myserver.js >> logfile.log
I also add the >> logfile bit on the end so I can easily save the node console.log() statements.
Why did I use a shell script? Well I also added in an if statement that checked to see if the node myserver.js process was already running.
That way I was able to create a single command line option that both lets me keep the server going and also restart it when I have made changes, which is very helpful for development.
In case the lenght of the question might be scary, the summary of the question is how to interact with a front end app from a node server. Puppeteer usage should come along with that request solved I believe. Question is large because I explained all my failed attempts to achieve backend code (puppeteer) work in the browser. Apart from building and running the repo that although its easy right following the instructions might take a some time, I believe the question should be feasable for a javascript/node regular programmer. There it goes, thanks for reading.
I cloned, built and ran imgui-js repository succesfully.
I want to use it along with puppeteer for a small app. All the npm commands inside and stuff tried are inside the mentioned imgui-js project.
I tried:
1.- Run the node example from the project: With npm run-script start-example-node.
This runs the example/index.js script, but nothing is drawn as we are not in the browser and the window is undefined. Can be checked debugging in the main.ts:
if (typeof(window) !== "undefined") {
window.requestAnimationFrame(done ? _done : _loop);
}
So I do not understand the purpose of this example in the repo.
Edit: Seems it can be to have the client-server comunication done, but I do not now how to do this.
2.- Puppeteer browserify:
I followed the browserify hello world.
Just a summary of the steps:
npm install -g browserify
npm i puppeteer
Go to the build folder to generate de bundle.js for my const puppeteer = require('puppeteer'); script, so cd example, cd build, browserify myScript.js -o bundle.js
Add <script src="./build/bundle.js"></script> to the example/index.html.
I obtain this error:
Uncaught TypeError: System.register is not a function
at Object.96.puppeteer (bundle.js:19470:8)
at o (bundle.js:1:265)
at r (bundle.js:1:431)
at bundle.js:1:460
I also tried browserifying main.js along with my script: browserify main.js myScript.js -o bundle.js. Same error.
3.- Try to setup puppeter with the rollup module bundler: following this resource among others. So doing:
npm install --save-dev rollup tape-modern puppeteer
npm install --save-dev rollup-plugin-node-resolve
npm install --save-dev rollup-plugin-commonjs
npm install --save-dev sirv tape-browser-color
And tried to add that the the imgui-js rollup.config.js configuration file.
Think its not working because all the server setup at the npm start and so on is not performed with rollup.
4.- Puppeteer-web: Following the steps of this resource I tried to run puppeteer in the browser.
npm i puppeteer-web
Code in the client and the server:
Client:
<script src="https://unpkg.com/puppeteer-web"></script>
<script>
const browser = await puppeteer.connect({
browserWSEndpoint: `ws://0.0.0.0:8080`, // <-- connect to a server running somewhere
ignoreHTTPSErrors: true
});
const pagesCount = (await browser.pages()).length;
const browserWSEndpoint = await browser.wsEndpoint();
console.log({ browserWSEndpoint, pagesCount });
</script>
Server (server.js script):
const httpProxy = require("http-proxy");
const host = "0.0.0.0";
const port = 8080;
async function createServer(WSEndPoint, host, port) {
await httpProxy
.createServer({
target: WSEndPoint, // where we are connecting
ws: true,
localAddress: host // where to bind the proxy
})
.listen(port); // which port the proxy should listen to
return `ws://${host}:${port}`; // ie: ws://123.123.123.123:8080
}
const puppeteer = require("puppeteer");
puppeteer.launch().then(async browser=>{
const pagesCount = (await browser.pages()).length; // just to make sure we have the same stuff on both place
const browserWSEndpoint = await browser.wsEndpoint();
const customWSEndpoint = await createServer(browserWSEndpoint, host, port); // create the server here
console.log({ browserWSEndpoint, customWSEndpoint, pagesCount });
})
Run server script: node server.js. Server seems properly created. Terminal log:
browserWSEndpoint: 'ws://127.0.0.1:57640/devtools/browser/58dda865- b26e-4696-a057-25158dbc4093',
customWSEndpoint: 'ws://0.0.0.0:8080',
pagesCount: 1
npm start (from new terminal to assure the created server does not terminate)
I obtain the error in the client:
WebSocket connection to 'ws://0.0.0.0:8080/' failed:
(anonymous) # puppeteer-web:13354
I just want to use puppeteer with this front end library together in my app, fetching data with puppeteer to display it the UI and provide the user input back to puppeteer.
My ideal solution would be number 1, where I would be able to use any npm package apart from puppeteer and communicate from the backend(node server) to the client (imgui user interface) back and forth.
Thanks for any help.
EDIT:
I more less achieved it with the node server solution server which is my desired scenario, with expressjs and nodemon, running a different server in the application and communicationg with the app. Now I would find more valuable any help on:
1.- The browserifying solution and or insight about why my attempts with this approach failed.
2.- The solution that keeps everything in the one same server, that would be the server that in the repo serves the html to the browser with "start-example-html": "http-server -c-1 -o example/index.html". Dont know if that is possible. Its because I would not lose the life loading etc if I serve both things with my expressjs server added by myself.
Kind of what Create React App does with Proxying API Requests
3.- As suggested in the comments, guidance or solution to make the server code render a window through node with the imgui output (npm start-example-node) of course would be a valid answer to the question.
Seems not quite correct to change the question conditions during the bounty with a bit of a broad new scenario, but now that conditions has changed so I try to make the most of the investment and the research already done in the topic, also due to my lack of expertise in the wev-dev module bundling configuration area, so bounty may be granted for the most valuable advice in any of the two topics mentioned above. Thanks for your understanding.
I have python and node scripts set as cron jobs on EC2. The python scripts run but the node scripts do not run. The node scripts run fine when activated manually from the command line. This is a simple script that finds out if today is a holiday and then puts the boolian answer into a file named isHoliday.csv.
What I've tried so far:
Set as crontab using: crontab -e (last entry in this pic)
Set as crontab using: sudo crontab -e
Created a strange cron.d file, put the cron details in it, and chmod'd it 0644, using: sudo crontab -e; shown above.
cron.d contents:
I see the log file is named holiday_script.log in the sudo cron, and holiday.log in the cron.d file, but neither log file has been created.
Replaced relative paths with absolute paths. (But I think this is still the most likely culprit.)
Code in the holiday.js file:
// Check if it is a holiday, t/f
var holidayChecker = require('usa-holidays');
var date = new Date();
var holidayObj = holidayChecker.make(date);
var isHoliday = !holidayObj.isBusinessDay();
// put the answer into a file so it can be read by python crons
var fs = require('fs');
fs.writeFile("/home/ec2-user/stack/isHoliday.csv", isHoliday, function(err) {
if(err) {
return console.log(err);
}
});
I don't know the exact solution, but you can view your cron logs by moving to a different directory. When you first login to EC2, do this twice: cd ..
That will take you up two directories. Then you'll need to switch user to sudo like this: sudo su
Then move to the var/log folder. There should be a file named "cron". Since you have crons setup as *****, that file should be filling up with data every second. Tail it by typing: tail -f cron. That will allow you to see the crons execute in real time.
Also, the "mail" notice: navigate to that folder and use less to read the mail. That file will have more clues. Scroll down with the down-arrow.
That isn't the answer but it will help you move forward a bit.
If you just want to run JS/TS code at a scheduled time interval without worrying about cron-jobs or servers, you can check out services like https://chunk.run
I just discovered that my nodejs app keeps crashing, so I've used forever app.js to start my app and have it automatically restarted when it crashes.
Problem: Now my app outputs alot of useful information as it runs via console.log and util.log. I used to use screen to run the node app, but now that I'm using forever to run the nodejs app, I can no longer see all the outputs.
Is there any way to see all the output from the nodejs app in realtime?
Directly with forever command :
forever logs app.js -f
It shows in realtime output of your application and forever logs (shows detected changes & restart messages).
You can watch a logfile live by using this shell-command.
tail -f /path/to/logfile
Not sure if this is what you needed.
Simplest way to go is
Run :
forever logs // will give you list of log files
forever logs 0 -f // then just provide the index of log
If you pass the --help flag to Forever you'll see this example:
forever -o out.log -e err.log my-script.js
-o and -e define the stdout and stderr log files.
-o OUTFILE Logs stdout from child script to OUTFILE
-e ERRFILE Logs stderr from child script to ERRFILE
Forever seems a little overkill for development. Give Supervisor a shot and see if you like it better:
npm install -g supervisor
supervisor app.js
I am running nodejs on AWS EC2 instance and this worked for me.
Note: logs are accessible if you are root owner. So first use sudo su then
forever -a -o out.log -e err.log yourServerApp.js
It will tail console log (in case you track event messages from log) and error log. I hope it helps someone.
linux : tail -f /path/to/logfile.log
windows : enter PowerShell -> Get-Content /path/to/logfile.log -Wait -Tail 1000