Directory copy from Primary Server to Secondary Server Automatically using rsync

Network Topology

Tasks

** SSH Primary to Secondary Server without password

** Install rsync in both server

** Automate a directory to sync with Secondary server

SSH Primary to Secondary Server without password

Login to Primary Server and check the IP address

Login to Secondary Server and check the IP address

From Primary Server create the SSH Key with "ssh-keygen". Please do not provide any password to make it password less.

Create .ssh directory in Secondary Server with below command.

         # mkdir /root/.ssh/

Send the "id_rsa.pub" public key from Primary Server to Secondary Server

       # scp /root/.ssh/id_rsa.pub root@192.168.0.3:/root/.ssh

On Secondary Server create a file name "authorized_keys" and put the content of "id_rsa.pub" on that file

      # touch /root/.ssh/authorized_keys

      # cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

Set permissions on Secondary Server

      #chmod -R 700 /root/.ssh/

      #chmod -R 640 /root/.ssh/authorized_keys

Now try to login from Primary Server to Secondary server without password

     # ssh 192.168.0.3

Install rsync in both server

On both server run following command to install rsync

     # apt-get install rsync -y

Automate a directory to sync with Secondary server

Let say I want to copy “/home/” directory from Primary Server to Secondary server automatically every day at 1 AM.

Add the line below in /etc/crontab file

00 1 * * *      root              rsync -avzhe ssh /home/ 192.168.0.3:/home/

Now restart cron Service

service cron restart

Enjoy!

Live file synchronization across multiple Linux servers using LSYNC

At first please take note I have implemented this in Debian Server.
Perform SSH Login Without Password from Master Server to Slave Server
Master Server:
#ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/root/.ssh/id_rsa):[Just press Enter key]
Enter passphrase (empty for no passphrase): [Just Press enter key]
Enter same passphrase again: [Just Pess enter key]
Your identification has been saved in /home/root/.ssh/id_rsa.

#ssh-copy-id -i ~/.ssh/id_rsa.pub remote-ip

Now test from master server,
# ssh remote-ip
[It will not ask for password and take you to the remote server]


Now Install Lsync on Master Server:
#apt-get update
#apt-get install -y lua5.1 liblua5.1-dev pkg-config rsync asciidoc

# vim /etc/lsyncd/lsyncd.conf.lua
settings {
logfile = "/var/log/lsyncd/lsyncd.log",
statusFile = "/var/log/lsyncd/lsyncd-status.log",
statusInterval = 10
}
sync {
default.rsync,
source="/home/",
target="remote-ip:/home/",
rsync = {
compress = true,
verbose = true,
owner = true,
group = true,
perms = true,
acls = true,
rsh = "/usr/bin/ssh -p 22 -o StrictHostKeyChecking=no"}
}

sync {
default.rsync,
source="/var/mail/",
target="remote-ip:/var/mail/",
rsync = {
compress = true,
verbose = true,
owner = true,
group = true,
perms = true,
acls = true,
rsh = "/usr/bin/ssh -p 22 -o StrictHostKeyChecking=no"}
}
[Save and Exit]

#mkdir /var/log/lsyncd/

#touch /var/log/lsyncd/lsyncd.log

#touch /var/log/lsyncd/lsyncd-status.log

#service lsyncd start


Slave Server:
#apt-get install rsync



Now test from Master Server:
#cd /home/

#touch test-file


Slave Server:
#cd /home/

#ls -lah


############# End of Lsync Configuration #############




*** Keep in mind if you want to backup a mail server to a secondary one you have to move a copy of /etc/passwd, /etc/shadow, /etc/group file from master server to backup server. Follow below steps to do that once in a day ***



Slave server:
#mkdir /root/user-backup-from-master-server

Master server:
#vim /usr/local/src/backup-users
scp /etc/passwd /etc/group /etc/shadow root@remote-ip:/root/user-backup-from-master-server
[Save and Exit]


#chmod 755 /usr/local/src/backup-users


#vim /etc/crontab
01 15 * * *    root    /usr/local/src/backup-users
[Save and Exit]


#/etc/init.d/cron restart


** This procedure will transfer a copy of /etc/passwd, /etc/group, /etc/shadow files everyday at 3:01PM from Master server to Slave server.