Rsync, the latest data image backup tool in Linux

1. What is rsync?

Rsync, remote synchronize is a software that implements remote synchronization. It can keep the permissions, time, soft and hard links, and other additional information of the original file while Synchronizing files. Rsync uses the "rsync algorithm" to provide a fast way to synchronize files between clients and remote file servers. It can also transmit files through ssh, which ensures high confidentiality, in addition, it is free software.

Rsync includes the following features:

Update the entire directory and tree and file system;
Optional maintenance of symbolic chains, hard links, files belonging to, permissions, devices, and time;
No special permission requirements are required for installation;
For multiple files, the internal pipeline reduces the latency of file waiting;
You can use rsh, ssh, or direct port as the transfer port;
Supports anonymous rsync file synchronization and is an ideal image tool;

2. rsync installation. Common method: yum install rsync

3. configuration file of rsync server

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1. Cat/etc/rsyncd/rsync. conf

2. # Distributed under the terms of the GNU General Public License v2

3. # Minimal configuration file for rsync daemon

4. # See rsync (1) and rsyncd. conf (5) man pages for help

5. # This line is required by the/etc/init. d/rsyncd script

7. Pid file =/var/run/rsync. pid

8. Port = 873

9. # Address = 192.168.1.171

10. # Uid = nobody

11. # Gid = nobody

12. Uid = root

13. Gid = root

14. Use chroot = yes

15. Read only = no

17. # Limit access to private LANs

18. Hosts allow = *

19. # Hosts deny = *

20. Max connections = 5

21. Motd file =/etc/rsyncd/rsync. motd

23. # This will give you a separate log file

24. # Log file =/var/log/rsync. log

25. # This will log every file transferred-up to 85,000 + per user, per sync

26. # Transfer logging = yes

28. Log format = % t % a % m % f % B

29. Syslog facility = local3

30. Timeout = 300

32. [Data]

33. Path =/data1

34. List = yes

35. Ignore errors

36. Auth users = root

37. Secrets file =/etc/rsyncd/rsync. secrets

38. Comment = rsync data1 dir

39. # Exclude = beinan/samba/

41. [Garbagekrc]

42. Path =/data1/garbagekrc

43. List = yes

44. Ignore errors

45. Auth users = root

46. Secrets file =/etc/rsyncd/rsync. secrets

47. Comment = rsync garbagekrc dir

User Password File:

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1. Cat/etc/rsyncd/rsync. secrets

2. Root: test123

The username must be an existing user on the server.
4. Start the rsync service:/usr/bin/rsync -- daemon -- config =/etc/rsyncd/rsync. conf

5. Back Up Files to the server:

Rsync-az -- password-file = rsync. password jsoncpp/* root @ IP: data/mydata/

Password-file can specify the password.

6. rsync can also pull files from the server to the local device. You can use crontab to implement timed synchronization.

7. For more information, see man rsync.