CentOS5 + rsync Synchronize files on two servers

Document directory

• Always use rsync over ssh
• Rsync command common options
• Task: Copy file from a local computer to a remote server
• Task: Copy file from a remote server to a local computer
• Task: Synchronize a local directory with a remote directory
• Task: Synchronize a remote directory with a local directory
• Task: Synchronize a local directory with a remote rsync server
• Task: Mirror a directory between my "old" and "new" web server/ftp

Always use rsync over ssh

Since rsync does not provide any security while transferring data it is recommended that you use rsync over ssh. This allows a secure remote connection. Now let us see some examples of rsync.

Rsync command common options

• -- Delete: Delete files that don't exist on sender (system)
• -V: Verbose (try-VvFor more detailed information)
• -E "ssh options": Specify the ssh as remote shell
• -: Archive mode
• -R: Recurse into directories
• -Z: Compress file data

Task: Copy file from a local computer to a remote server

Copy file from/www/backup.tar.gz to a remote server called openbsd. nixcraft. in

$ Rsync-v-e ssh/www/backup.tar.gz jerry@openbsd.nixcraft.in :~

Output:

Password: sent 19099 bytes received 36 bytes 1093.43 bytes/sec total size is 19014 speedup is 0.99

Please note that symbol~Indicate the users home directory (/home/jerry ).

Task: Copy file from a remote server to a local computer

Copy file/home/jerry/webroot.txt from a remote server openbsd. nixcraft. in to a local computer/tmp directory:

$ Rsync-v-e ssh jerry@openbsd.nixcraft.in :~ /Webroot.txt/tmp

Password

Task: Synchronize a local directory with a remote directory $ rsync-r-a-v-e "ssh-l jerry" -- delete openbsd. nixcraft. in:/webroot // local/webrootTask: synchronize a remote directory with a local directory $ rsync-r-a-v-e "ssh-l jerry" -- delete/local/webroot openbsd. nixcraft. in:/webrootTask: Synchronize a local directory with a remote rsync server $ rsync-r-a-v -- delete rsync: // rsync. nixcraft. in/cvs/home/cvsTask: Mirror a directory between my "old" and "new" web server/ftp

You can mirror a directory between my "old" (my.old.server.com) and "new" web server with the command (assuming that ssh keys are set for password less authentication)

$ Rsync-zavrR -- delete -- links -- rsh = "ssh-l vivek" my.old.server.com:/home/lighttpd

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

When you need to copy files on the server to another machine, you can use rsync to synchronize files.

I. Server Configuration:
# Yum-y install xinetd

# Vi/etc/xinetd. d/rsync
Run the following code:

Copy codeThe Code is as follows: service rsync
{
Disable = yes
Socket_type = stream
Wait = no
User = root
Server =/usr/bin/rsync
Server_args =-daemon
Log_on_failure + = USERID
}

InDisable = yesChangeDisable = no

Then start xinetd

Copy codeThe Code is as follows: #/etc/init. d/xinetd start

Note: If the server is installed with a firewall, remember to open the port. The default port is 873.

Copy codeThe Code is as follows: # telnet 127.0.0.1 873

Trying 127.0.0.1...
Telnet: connect to address 127.0.0.1: Connection refused
# Iptables-a input-s 192.168.0.0/255.255.255.0-p tcp-m tcp -- dport 873-j ACCEPT
# Iptables-a input-p tcp-m tcp -- dport 873-j DROP

# Vi/etc/rsyncd. conf

Copy codeThe Code is as follows: [backup]
Path =/www
Auth users = admin
Uid = root
Gid = root
Secrets file =/etc/rsyncd. secrets
Read only = no

[Server code]
Path = backup file path
Auth users = authorized account
Uid = uid at execution time
Gid = gid at execution time
Secrets file = Password file Location
Read only = read-only or not

# Vi/etc/rsyncd. secrets

Copy codeThe Code is as follows: admin: 1234 # Username: Password Authentication

Give the file the correct permissions
# Chown root: root/etc/rsyncd. secrets
# Chmod 600/etc/rsyncd. secrets

2. client-side Synchronization
By default, the client seems to have installed rsync. If not, install the following:
# Yum-y install rsync

Perform asynchronous synchronization:

/Usr/bin/rsync-avz-progress admin@192.168.1.105: backup/www

Synchronization command description:

1. Display directory content

Command
--
A) rsync
B) rsync-r
C) rsync jack@192.168.0.1 ::
D) rsync ssh_user@192.168.0.1:

Command description
---
A) display directory content (level 1)
B) recursively display directory content
C) display the remote host directory content
* Note 1: Port mode, based on rsync User Authentication
* Note 2: The directory on rsync server must have the xx7 permission.
D) view the remote host directory
* Note 1: In remote shell mode, authentication based on the identity of local users connected through ssh
* Note 2: Only one colon (:) is used here, and the user name is the ssh user of the remote host, and the password is also the password of the ssh user.
* Note 3: Use "to list information about the folder itself. To list folder content, use "/".

Parameter description
---
-R performs recursive operations on directories.

2. synchronization between local directories

Command
--
A) rsync-av-progress/*** note (/)***
B) rsync-av-progress
C) rsync-avu-progress-delete/
D) rsync-av-progress-temp-dir =/tmp/

Command description
---
A) synchronize all files under the src-dir directory to the dst-dir directory.
B) synchronize all files under the src-dir directory to the dst-dir/src-dir directory.
C) Update the src-dir directory content to the dst-dir directory for differential updates. If there is an increase/update, add or replace it. If there is a decrease, delete it.
D) More-temp-dir =/tmp than a), that is, specify/tmp as a temporary swap zone, so as to avoid file synchronization errors caused by insufficient space in the target directory.

Parameter description
---
-A is equivalent to the-rlptgoD set.
-U is equivalent to-update. It is not updated when the target file is newer than the source file.
-V: Display synchronized files
-Progress displays the percentage progress and transmission rate during file synchronization.
-Delete: delete files in the target directory that are more than the source directory.

3 synchronization between remote hosts
Command
--
A) rsync-avz-progress jack@192.168.0.1 ::/
B) rsync-avz-progress jack@192.168.0.1:/-password-file =/home/jack/rsync. jack
C) rsync-avuz-progress-delete jack@192.168.0.1:/-password-file =/home/jack/rsync. jack
D) rsync-avz-progress jack@192.168.0.1 ::/

Command description
---
A) synchronize the contents of the local directory to the directory of the remote host 192.168.0.1. jack is the rsync database user (see 3./etc/rsync. secrets)
B) synchronize non-interactive login files by automatically reading user passwords
C) more than B)-u and-delete
D) synchronize the remote host content to the local directory