Cron Job (Automate Scheduled tasks Using )

Any task that you schedule through crons is called a cron job. Cron jobs help us automate our routine tasks, whether they’re hourly, daily, monthly, or yearly.

Schedule

Scheduled value

5 0 * 8 *

At 00:05 in August.

5 4 * * 6

At 04:05 on Sunday.

0 22 * * 1-5

At 22:00 on every day-of-week from Monday through Friday.

Automate Scheduled task Using Cron Job

1.crontab -e

2.*/1 * * * *  sh /home/ashadullah-shawon/script.sh

3.*/1 * * * 6  sh /home/ashadullah-shawon/script.sh

script.sh

#! /bin/bash

date >> date.txt

Automate Scheduled task Using Cron Job

1.#!/bin/bash

2.tar -czvf backup.tar.gz  /data/test/

Basic Bash Script

#!/bin/bash

# A simple hello world example

greeting=”Hello”

name=”World”

echo $greeting $name

#!/bin/bash

read a

read b

echo $a $b

Basic Bash Script

#!/bin/bash

read a

read b

sum=$((a+b))

echo $sum

#!/bin/bash

read old_text

read new_text

find . -type f -exec sed -i “s/$old_text/$new_text/g” {} \;

Web Server Nginx

1.mkdir /var/www/html/web1.cloudageskill.com

2.mkdir /var/www/html/web2.cloudageskill.com

3.nano /var/www/html/web1.webdock.io/index.html

4.chown -R www-data:www-data /var/www/html/web1.cloudageskill.com

5.chown -R www-data:www-data /var/www/html/web2.cloudageskill.com

6.nano /etc/nginx/sites-available/web1.cloudageskill.com.conf

Web Server Nginx

server {

        listen 80;

        listen [::]:80;

        root /var/www/html/web1.cloudageskill.com;

        index index.html index.htm;

        server_name web1.cloudageskill.com;

   location / {

       try_files $uri $uri/ =404;

   }

}

Web Server Nginx

ln -s /etc/nginx/sites-available/web1.cloudageskill.com.conf /etc/nginx/sites-enabled/

ln -s /etc/nginx/sites-available/web2.cloudageskill.com.conf /etc/nginx/sites-enabled/

nginx -t

systemctl reload nginx

Web Server Nginx Load Balancer

upstream myproject {

  server 127.0.0.1:3000;

  server 127.0.0.1:3001;  

}

server {

  listen     80;

  server_name  node.cloudageskill.com;

  #uncomment for logs

  #access_log  logs/host.access.log  main;

  location / {

      proxy_set_header   X-Real-IP      $remote_addr;

      proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

      proxy_set_header   Host           $host;

      proxy_pass http://myproject; # make sure port matches open port in node app

  }

}