rsync is a Linux tool for backup and the creation of mirror. It support copying of links, preserving owners, groups and permission. It can use ssh to do the copy. It is extremely useful for mirroring other machine. rsync can work for both directions, remote to local, and local to remote.
Anther advantage of the rsync is that it can compress the data during the sending to the remote machine, and by that save bandwidth and time.
The command has the following structure:
rsync <option> <source> <destination>
rsync useful options:
- -v –verbose
Show more information during the copy/sync
- -h –human-readable
show the number in human readable format, helpful for show file size in readable format.
- -p –perms
preserve the file permission, the destination will have the same permission as the source.
- -z –compress
The data is compressed during the transfer.
- -l –links
soft link (symbolic link) are copied as soft link
- -t –time
preserver the source modification time in the destination.
will clean the destination from any file that doesn’t exist in the sources.
- -r –recursive
recursive copy of directories.
- -a –archive
archive mode. excellent for backup.
This option include all the following:
-r, –recursive recurse into directories
-l, –links copy symlinks as symlinks
-p, –perms preserve permissions
-t, –times preserve modification times
-g, –group preserve group
-o, –owner preserve owner (super-user only)
-D same as –devices –specials
–devices preserve device files (super-user only)
–specials preserve special files
So for example I have the following node project:
oren@oren-computer:~/workspace/scripts/nodeScripts/testing $ ls -l total 28K -rw-rw-r-- 1 oren oren 1.7K אוק 8 21:50 app.js drwxr-xr-x 2 oren oren 4.0K אוק 8 12:53 bin drwxrwxr-x 107 oren oren 4.0K אוק 9 06:29 node_modules -rw-rw-r-- 1 oren oren 353 אוק 9 06:29 package.json drwxr-xr-x 5 oren oren 4.0K אוק 8 21:32 public drwxr-xr-x 2 oren oren 4.0K אוק 8 19:43 routes drwxr-xr-x 2 oren oren 4.0K אוק 8 12:53 views
And I want to create backup for it on server 10.0.0.7, on folder backup and using oren as a user name to connect the server, I will run the following:
oren@oren-computer:~/workspace/scripts/nodeScripts/testing $ rsync -avhz ~/workspace/scripts/nodeScripts/testing firstname.lastname@example.org:~/backup email@example.com's password: sending incremental file list testing/ testing/app.js testing/package.json testing/bin/ testing/bin/www testing/node_modules/ testing/node_modules/.bin/ testing/node_modules/.bin/acorn -> ../acorn/bin/acorn testing/node_modules/.bin/cleancss -> ../clean-css/bin/cleancss testing/node_modules/.bin/jade -> ../jade/bin/jade.js testing/node_modules/.bin/mime -> ../mime/cli.js testing/node_modules/.bin/mkdirp -> ../mkdirp/bin/cmd.js testing/node_modules/.bin/semver -> ../semver/bin/semver testing/node_modules/.bin/uglifyjs -> ../uglify-js/bin/uglifyjs testing/node_modules/accepts/ testing/node_modules/accepts/HISTORY.md testing/node_modules/accepts/LICENSE testing/node_modules/accepts/README.md testing/node_modules/accepts/index.js testing/node_modules/accepts/package.json testing/node_modules/acorn-globals/ . . . . . . testing/views/index.jade testing/views/layout.jade sent 2.36M bytes received 23.49K bytes 367.04K bytes/sec total size is 7.97M speedup is 3.34
Now let analyze the command:
This is the command name.
This is the command option. I used a for archive. z for compressing data during transfer. h for show the information as homan readble and v for verbose information, it show all the file name that it trasformed.
This was the source directory name
This is the destination. It mean the following: we want to copy it to server 10.0.0.7, to the folder backup in the home directory of the user, and to use user oren to connect to the destination server.
The part before the “:”, is the server information, the part after the “:” is the folder information. before the “@” we have the user name and after the “@” we have the server name or ip.