In this tutorial we’ll install the Debian Linux 9 (squeeze), Apache 2 with mpm-itk (to run each web as a isolated user),...
Remote backups using rsyncadmin
rsync is a software application for Unix systems which synchronizes files and directories from one location to another while minimizing data transfer using delta encoding when appropriate. An important feature of rsync not found in most similar programs/protocols is that the mirroring takes place with only one transmission in each direction. rsync can copy or display directory contents and copy files, optionally using compression and recursion.
We’re going to configure a machine to sync files from a specific folder to a remote machine every day using rsync in four easy steps. This is ideal solution to do automated backups for servers and workstations.
1. Configure remote machine (if not using service by a third party)
Install rsync, it must be installed on both remote and local machines to be able to sync data
apt-get install rsync
Create a new user used by the local machine to connect to the remote machine
adduser user1 --home /home/user1
Replace user1 with your preferred username. You can set any password you like and make it complicated because it’s only needed once.
2. Configure the local machine (the one being backed up)
apt-get install rsync
Create a private key to avoid passphrase popup to be able to do automatic backups
ssh-keygen -t dsa
Copy the key to the remote machine
ssh-copy-id -i .ssh/id_dsa.pub [email protected]
Replace user1 with your username and remote.machine.com with the remote machine’s hostname or ip address
The link between the two machine is set up and you no longer need password to connect to the remote machine using ssh. You can try: ssh [email protected]
3. The actual backup process
Backup folders using the following command
rsync -avz --progress -e ssh /var/www [email protected]:backup
Using this command, all files in the /var/www folder will be synced to the remote machine into a folder named backup
4. Automate the backup using cron
Open the cron config file for current user
Add a line similar to the following into the config file
0 3 * * * rsync -az -e ssh /var/www [email protected]:backup >> /dev/null 2>&1
Your /var/www will be synced to the remote machine at 3am every day