Linux rsync Incremental Sync method __linux

Linux rsync incremental Sync method

You can first use Rpm-qa |grep rsync to see if rsync is installed
Let's talk about the Rsyns configuration process
I. Configuring server-side
First edit the/etc/rsyncd.conf content as follows:
UID = Nobody #进行备份的用户 nobody for any user
GID = Nobody #进行备份的组 nobody for any group
Use chroot = no #不使用chroot
Max connections = #最大连接数
Log file =/var/log/rsyncd.log #日志文件

[RSYNCD] # Here is the Certified module name
Path =/home/test/#参与同步的目录
Ignore errors # can ignore some irrelevant IO errors
Read Only = yes #只读
List = no #不允许列清单
Anth users = root #认证的用户名
Secrets file =/etc/rsyncd.secrets #密码文件存放地址

Then edit a rsyncd.secrets password deposit file under/etc.
Format is

User name: Password as

Root:xl1100 finally launched rsync in daemon form on the server side
Command is: Rsync–daemon
Rsync started with Port 873

Two. Configuration of the Client
Edit a rsyncd.secrets password deposit file under/etc

Execute the command as:
RSYNC-VZURTOPG--progress--delete root@192.168.100.150::rsyncd/home/test--password-file=/etc/rsync.secret
Parameter v indicates detailed hints
Z indicates compression
U means to update only
TOPG maintain the original attributes of the file, such as the owner, time parameters
--progress refers to the display
--delete means that if this file is deleted by the server side, then the client also deletes the file accordingly, maintaining true consistency
Root is User name
@192.168.100.150 for server IP
:: The following RSYNCD is the Certified module name
/home/test directory name for backup to local
--password-file=/etc/rsync.secret the address of the location where the password is stored

You can write scripts rsync.sh
#!/bin/sh
RSYNC-VZRTOPG--progress--delete root@192.168.100.150::rsyncd/home/test--password-file=/etc/rsync.secret

The script is then added to the/etc/crontab file to perform the update at timed intervals.

The following is attached to the change command option parameter detailed

rsync Command Parameters detailed

After the rsync server configuration is over, the next step is to issue an rsync command on the client to enable the server-side files to be backed up to the client. Rsync is a very powerful tool, and its commands have many feature options, and we'll analyze all of its options below.
The command format for rsync can be in the following six ways:
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::D EST
rsync [OPTION] ... rsync://[user@]host[:P ort]/src [DEST]
For each of the above six command formats, Rsync has six different working modes:
1 Copy Local files. This mode of operation is initiated when both SRC and des path information do not contain a single colon ":" delimiter. such as: Rsync-a/data/backup
2 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 ":" Separator. such as: Rsync-avz *.c foo:src
3 Use a remote shell program (such as rsh, SSH) to copy the contents of the remote machine to the local machine. This mode is started when the SRC address path contains a single colon ":" Separator. such as: Rsync-avz Foo:src/bar/data
4 Copy files from remote rsync server to local machine. This mode is started when the SRC path information contains the "::" delimiter. such as: Rsync-av Root@172.16.78.192::www/databack
5 copy files from local machine to remote rsync server. This mode is started when the DST path information contains the "::" separator. such as: Rsync-av/databack root@172.16.78.192::www
6 The list of files for the remote machine. This is similar to rsync transmission, but simply omitting the local machine information in the command. such as: Rsync-v rsync://172.16.78.192/www
The specific explanation for the rsync parameter is as follows:
-V,--verbose verbose mode output
-Q,--quiet thin output mode
-C,--checksum Open the check switch to force the file transfer to verify
-A,--archive archive mode, which represents the transfer of files recursively and maintains all file attributes equal to-rlptgod
-R,--recursive the subdirectory in recursive mode
-R,--relative using relative path information
-B,--backup creates a backup, which means that the old file is renamed to ~filename for the same file name already exists for the purpose. You can use the--suffix option to specify different backup file prefixes.
--backup-dir store backup files (such as ~filename) in the directory.
-suffix=suffix defines the backup file prefix
-U,--update only updates, skipping all files that already exist in DST, and the file time is later than the file you want to back up. (Do not overwrite the updated file)
-L,--links retention soft link knot
-L,--copy-links to treat soft links like regular files
--copy-unsafe-links only copies links that point beyond the src Path directory tree
--safe-links ignores links to the SRC path tree
-H,--hard-links keep hard links
-P,--perms keep file permissions
-O,--owner keep file owner information
-G,--group keep file group information
-D,--devices maintain device file information
-T,--times keep file time information
-S,--sparse special handling of sparse files to save DST space
-N,--dry-run which files will be transmitted
-W,--whole-file copy files without incremental detection
-X,--one-file-system do not cross file system boundaries
-B, the block size used by the--block-size=size test algorithm is 700 bytes by default
-E,--rsh=command specifies the use of rsh, SSH mode for data synchronization
--RSYNC-PATH=PATH Specifies the path information for the rsync command on the remote server
-C,--cvs-exclude use the same method as CVs to automatically ignore files to exclude files that you do not want to transfer
--existing updates only those files that already exist in DST, not the newly created files
--delete Delete files that are not in the DST SRC
--delete-excluded also deletes the receiving end of files that are excluded by the option specified
--delete-after after transmission is over
--ignore-errors in time IO errors are also deleted
--max-delete=num Delete NUM files up to
--partial retains files that are not fully transmitted for some reason, to expedite subsequent transmissions
--force forcibly deletes a directory, even if it is not empty
--numeric-ids does not match the user and group IDs of numbers to user and group names
--timeout=time IP timeout time in seconds
-I,--ignore-times not skip those files that have the same time and length
--size-only when deciding whether to back up a file, just look at the file size without considering the file time
--modify-window=num the time stamp window that determines whether a file is in the same time, default is 0
-t--temp-dir=dir create temporary files in dir
--compare-dest=dir also compares files in DIR to determine whether a backup is required
-P equals to--partial
--progress Display backup process
-Z,--compress compression of backed-up files on transfer
--EXCLUDE=PATTERN Specifies to exclude file modes that do not require transfer
--INCLUDE=PATTERN Specifies the file mode that is not excluded and needs to be transferred
--exclude-from=file exclude files in the specified mode in file
--include-from=file does not exclude files that match the file-specified pattern
--version Print version Information
--address bound to a specific address
--CONFIG=FILE specifies a different profile and does not use the default rsyncd.conf file
--PORT=PORT Specifies the other rsync service ports
--blocking-io blocking IO for a remote shell
-stats gives the transfer status of some files
--progress transmission process in real time
--log-format=format Specify log file format
--password-file=file gets the password from file
--bwlimit=kbps limit I/O bandwidth, Kbytes per second
-H,--help display Help information
The AZV option is generally used