Addressing

master.darin.web.id
ip address : 103.43.x.34

slave.darin.web.id
ip address : 103.43.x.36

1. Install rsync on master
   apt/yum -y install rsyncd
2. Generate public key on master
   ssh-keygen -t rsa
3. Copy public key from master to slave for login without password
   ssh-copy-id [email protected]
4. Create directory and file for testing
   mkdir /var/www/html
   cd /var/www/html && touch file{1..100}.txt
   cd /var/www/html && fallocate -l 1G dummyfile #create 1G dummyfile
   
5. Sync directory html from master to slave
   rysnc -avzh -e ssh /path/source-dir userhost:/path/dest-dir
   rsync -avzh -e ssh /var/www/html [email protected]:/var/www/
   
   sending incremental file list
   ...
   total size is 0 speedup is 0.00

      -a : archive file
      -v : verbose the process
      -z : compress file
      -e : archive file first
      -h : human readable

If there are changes to the source directory such as deleting of files, the files on the remote host will remain and will not be deleted. Therefore, you can use --delete option so that the files on the remote host are also deleted (sync). Below is the command:

rsync -avzh --delete -e ssh /var/www/html [email protected]:/var/www/

Then you can use cron to synchronize files between hosts automatically.

vim etc/crontab

15 * * * * root /usr/bin/rsync -avz --delete -e ssh /var/www/html [email protected]:/var/www/

systemctl restart crond
systemctl enable crond