Setting rsync on centos6

These steps are to synchronize a remote directory to a local directory.

1. Install the xinted daemon (local machine)

[root@centos6pg1 syncdir]# yum install xinetd

Loaded plugins: fastestmirror, refresh-packagekit

Loading mirror speeds from cached hostfile

 * base: mirror.yongbok.net

 * extras: mirror.optus.net

 * updates: mirror.yongbok.net

Setting up Install Process

Resolving Dependencies

--> Running transaction check

---> Package xinetd.x86_64 2:2.3.14-29.el6 set to be updated

--> Finished Dependency Resolution

Dependencies Resolved

==================================================================================================================

 Package                  Arch                     Version                           Repository              Size

==================================================================================================================

Installing:

 xinetd                   x86_64                   2:2.3.14-29.el6                   base                   120 k

Transaction Summary

==================================================================================================================

Install       1 Package(s)

Upgrade       0 Package(s)

Total download size: 120 k

Installed size: 257 k

Is this ok [y/N]: y

Downloading Packages:

xinetd-2.3.14-29.el6.x86_64.rpm                                                            | 120 kB     00:06

Running rpm_check_debug

Running Transaction Test

Transaction Test Succeeded

Running Transaction

  Installing     : 2:xinetd-2.3.14-29.el6.x86_64                                                              1/1

Installed:

  xinetd.x86_64 2:2.3.14-29.el6

Complete!

-------------------------------------------------------------------------------------------

[root@centos6pg1 syncdir]# vi /etc/xinetd.d/rsync

change disable=no to yes

2. On centospg1 run the following

[root@centos6pg1 syncdir]# rsync -r -a -v -e "ssh -l root" --delete /var/syncdir/ centos6pg2:/var/syncdir/

root@centos6pg2's password:

sending incremental file list

./

gandu

sent 106 bytes  received 34 bytes  21.54 bytes/sec

total size is 3487834112  speedup is 24913100.80

3.
This will synchronize the centospg2 directory with your local directory.

There are two problems with this approach

1. You will be asked for a password each time. To solve this establish a trust relation between the two hosts

2. You need to run this each time to get it synchronized. You automation capabilities as in cron

To establish a trust relation:-

[root@centos6pg1 syncdir]# ssh-keygen -t rsa

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

ed:4e:1f:4c:fc:19:47:49:c7:3d:04:af:43:b0:fc:c5 root@centos6pg1

The key's randomart image is:

+--[ RSA 2048]----+

|           .ooo.+|

|           .+o.+.|

|           .o.+oo|

|         . o...Eo|

|        S + ooo .|

|         + . ..  |

|          . .    |

|                 |

|                 |

+-----------------+

[root@centos6pg1 syncdir]# ssh-copy-id -i ~/.ssh/id_rsa.pub root@centos6pg2

root@centos6pg2's password:

Now try logging into the machine, with "ssh 'root@centos6pg2'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@centos6pg1 syncdir]# ssh root@centos6pg2

[root@centos6pg2 ~]# exit

To put this in crontab:-

[root@centos6pg1 syncdir]# crontab -e

*/15 * * * * rsync -r -a -v -e "ssh -l root" --delete /var/syncdir centos6pg2:/var/syncdir/