How to set nginx to start automatically on boot in linux?

To set Nginx to start automatically on boot in a Linux system, follow these steps: 1. Open the main configuration file for Nginx. This file is typically located at /etc/nginx/nginx.conf in most Linux distributions. Use a text editor (such as vi or nano) to open the file. 2. Find and edit the following line:

  user www-data;
  worker_processes auto;

Change the user line to a user with appropriate permissions, such as root, so that Nginx can run with administrator privileges at startup. Save and close the file. Check the system’s Init system. Currently, there are two main Init systems: SysV and Systemd. Execute the following command to determine which Init system your system is using:

  ps --no-headers -o comm 1

If the output is “init”, the system will use the SysV Init system; if the output is “systemd”, the system will use the Systemd Init system. Perform the following actions for different Init systems:

a. For SysV Init system: Create a startup script file /etc/init.d/nginx, and open the file with a text editor. Copy the following content into the file:

       #! /bin/sh
        ### BEGIN INIT INFO
        # Provides:          nginx
        # Required-Start:    $all
        # Required-Stop:     $all
        # Default-Start:     2 3 4 5
        # Default-Stop:      0 1 6
        # Short-Description: starts the nginx web server
        # Description:       starts nginx using start-stop-daemon
        ### END INIT INFO
        
        PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
        DAEMON=/usr/sbin/nginx
        NAME=nginx
        DESC=nginx
        
        test -x $DAEMON || exit 0
        
        set -e
        
        . /lib/init/vars.sh
        . /lib/lsb/init-functions
        
        case "$1" in
          start)
              echo -n "Starting $DESC: "
              start-stop-daemon --start --quiet --pidfile /var/run/$NAME.pid \
                  --exec $DAEMON -- $DAEMON_OPTS || true
              echo "$NAME."
              ;;
          stop)
              echo -n "Stopping $DESC: "
              start-stop-daemon --stop --quiet --pidfile /var/run/$NAME.pid \
                  --exec $DAEMON || true
              echo "$NAME."
              ;;
          restart|force-reload)
              echo -n "Restarting $DESC: "
              start-stop-daemon --stop --quiet --pidfile \
                  /var/run/$NAME.pid --exec $DAEMON || true
              sleep 1
              start-stop-daemon --start --quiet --pidfile \
                  /var/run/$NAME.pid --exec $DAEMON -- $DAEMON_OPTS || true
              echo "$NAME."
              ;;
          reload)
              echo -n "Reloading $DESC configuration: "
              start-stop-daemon --stop --signal HUP --quiet --pidfile \
                  /var/run/$NAME.pid --exec $DAEMON || true
              echo "$NAME."
              ;;
          *)
              N=/etc/init.d/$NAME
              echo "Usage: $N {start|stop|restart|reload|force-reload}" >&2
              exit 1
              ;;
        esac
        
        exit 0

Save and close the file. Set the script file to be executable.

       sudo chmod +x /etc/init.d/nginx

Add Nginx to the system startup.

       sudo update-rc.d nginx defaults

For Systemd Init systems: create an Nginx service file `/etc/systemd/system/nginx.service` and open the file using a text editor. Copy the following content into the file:

       [Unit]
        Description=Nginx
        After=network.target
        
        [Service]
        ExecStart=/usr/sbin/nginx
        ExecReload=/usr/sbin/nginx -s reload
        ExecStop=/usr/sbin/nginx -s stop
        PrivateTmp=true
        
        [Install]
        WantedBy=multi-user.target

Save and close the file. Restart the systemd configuration files:

       sudo systemctl daemon-reload

Install Nginx on the system boot.