Rsync is a powerful tool used for syncing files between servers. It is a fast and efficient tool that can save you a lot of time and bandwidth when transferring large files. To install rsync on Ubuntu or Debian, use the following command:
sudo apt-get update
sudo apt-get install rsync
To install rsync on CentOS or Fedora, use the following command:
sudo yum install rsync
Once installed, you can use rsync to sync files between servers by running the following command:
rsync [options] source destination
For example, to sync the contents of the /var/www/html directory on server1 to the /var/www/html directory on server2, you would run the following command:
rsync -avz /var/www/html/ server2:/var/www/html/