BASH - why my NodeJS server script crashing?

Question

Running CentOS (Linux signal-server 3.10.0-123.8.1.el7.x86_64). When i login to the server using SSH and then execute this following line manually it works, but crash when i exit my SSH connection to the server.

$ node /var/www/html/signal-server/avi.js &

This robot also fails to let the server run when i am not manually logged in via SSH:

#!/bin/bash
while :
do
  # 1
  avi=$(pgrep -f "avi.js")
  if [[ "$avi" ]]; then
    log1="1 - running avi.js $1 $2"
  else
    log1="1 - re-launch avi.js $1 $2"
    ps aux | grep "avi.js" | awk '{print $2}' | xargs kill
    sleep 1
    # same if nohup also used
    node /var/www/html/signal-server/avi.js &

  fi

  tt=$(date +"%Y-%m-%d %T")
  echo "$tt" "$log1"

  sleep 2
done

How can i make it run for-ever please? (i have also other services they are working fine only this one always crashing when i logout from the SSH session)

why not use github.com/foreverjs/forever ?

Ingmar de Lange
– Ingmar de Lange

2016-08-15 11:57:38 +00:00
Commented Aug 15, 2016 at 11:57 — Ingmar de Lange
– Ingmar de Lange, Commented Aug 15, 2016 at 11:57

Leon · Accepted Answer · 2016-08-15 11:57:28Z

2

nohup will do what you want

nohup node /var/www/html/signal-server/avi.js &

You should really write a systemd script for you service, then if your server restarts your service will startup again.

This is a rough idea what such a script may look like

[Service]
ExecStart=node /var/www/html/signal-server/avi.js
Restart=always
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=node-avi
User=some-user
Group=some-group
Environment=NODE_ENV=production

[Install]
WantedBy=multi-user.target

Spend a bit of time reading the systemd documentation

answered Aug 15, 2016 at 11:57

Leon

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3 Comments

user285594 Over a year ago

nohup did not solved the problem. when i used this then its working: github.com/foreverjs/forever

Leon Over a year ago

If you server is still dying, it could be because there is an error in the code. Given what I currently know I would still suggest using systemd

user285594 Over a year ago

Server code is not dying, i have already put exception catcher try { } catch () { } so it never dy.

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