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After configuring the rsync server, the next step is to issue the rsync command on the client to back up the server-side files to the client. Rsync is a very powerful tool, and its commands have many feature options.

1. rsync characteristic

Support copying special files such as linked files, devices, etc.

Can exclude specified file or directory synchronization function, equivalent to tar exclusion function

You can keep the permissions, time, soft and hard links, owners, groups and other attributes of the original file or directory unchanged-p

Incremental synchronization can be achieved, i.e., data whose synchronization changes, so the data transmission efficiency is very high, tar -N

You can use rcp, rsh, ssh, etc. to transfer files (rsync itself does not encrypt data)

Files and data (server and client) can be transferred via socket(process mode)****.

Supports anonymous or authenticated (no system user required) process mode transmission, enabling convenient and secure data backup and mirroring

2. Rsync command formats can be six:

rsync [OPTION]... SRC DEST rsync [OPTION]... SRC [USER@]HOST:DEST rsync [OPTION]... [USER@]HOST:SRC DEST rsync [OPTION]... [USER@]HOST::SRC DEST rsync [OPTION]... SRC [USER@]HOST::DEST rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]

Corresponding to the above six command formats, rsync has six different modes of operation:

Copy local files. This mode of operation is enabled when neither SRC nor DES path information contains a single colon ":" delimiter. Example: rsync -a /data /backup

Use a remote shell program (such as rsh, ssh) to copy the contents of the local machine to the remote machine. This mode is started when the DST path address contains a single colon ":" delimiter. For example: rsync -avz *.c foo:src

Use a remote shell program (such as rsh, ssh) to copy the contents of the remote machine to the local machine. This mode is enabled when the SRC address path contains a single colon ":" delimiter. rsync -avz foo:src/bar /data

Copy files from a remote rsync server to your local machine. This mode is enabled when the SRC path information contains a "::" delimiter. For example: rsync -av root@172.16.78.192::www /databack

Copy files from your local machine to a remote rsync server. This mode is enabled when the DST path information contains a "::" delimiter. For example: rsync -av /databack root@172.16.78.192::www

Column List of files on remote machine. This is similar to rsync transmission, but only by omitting the local machine information from the command. For example: rsync -v rsync://172.16.78.192/www

3. Rsync three modes

1、Local: rsync [OPTION...] SRC... [DEST] 2、Access via remote shell: Pull: rsync [OPTION...] [USER@]HOST:SRC... [DEST] Push: rsync [OPTION...] SRC... [USER@]HOST:DEST 3、Access via rsync daemon: Pull: rsync [OPTION...] [USER@]HOST::SRC... [DEST] rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST] Push: rsync [OPTION...] SRC... [USER@]HOST::DEST rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST

4. rsync common parameter options

5. server-side configuration file

[root@localhost /]# cat /usr/local/rsync/rsyncd.conf uid = root gid = root use chroot = no max connections = 5 strict modes = yes port = 8888 pid file = /var/run/rsyncd.pid lock file = /var/run/rsync.lock log file = /var/log/rsyncd.log [backup] path = /tmp/test/ comment = This is a test ignore errors read only = false list = no #hosts allow = 0.0.0.0 auth users = rsync secrets file =/etc/rsyncd/rsyncd.secrets [root@localhost /]# cat /etc/rsyncd/rsyncd.secrets rsync:fswl1234

6. From Linux Backup to Win Local

From linux/rsyncbak directory to windows D:\rsyncbak

cd C:\Program Files\cwRsync\bin\ rsync --port=8888 -vzrtopg --progress --timeout 600 --delete rsync@172.16.5.215::backup /cygdrive/d/rsyncbak

Remember to authorize

7. Transfer from win locally to linux

From windows D:\rsyncbak to linux/rsyncbak

cd C:\Program Files\cwRsync\bin\ rsync --port=8888 -vzrtopg --progress --timeout 600 --delete /cygdrive/d/rsyncbak rsync@172.16.5.215::backup

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