Rsync for file backup

rsync

rsync yes linux Data image backup tool under the system . Use the fast incremental backup tool Remote Sync Remote synchronization is possible , Support local replication , Or with others SSH、rsync Host synchronization .
You can mirror the entire directory tree and file system .
It's easy to keep the permissions of the original file 、 Time 、 Hard and soft links and so on .
You can install without special permission .
Fast ： The first synchronization rsync It copies everything , But the next time only the modified files are transferred .rsync In the process of data transmission, compression and decompression operations can be implemented , So you can use less bandwidth .
Security ： have access to scp、ssh And so on to transfer files , Of course, it can also be done directly socket Connect .
Support anonymous transmission , In order to facilitate the website mirror image .

rsync install

1. download (2018 year 9 month 25 Japan 13:52:23 The latest version is 3.1.3)
   wget https://download.samba.org/pub/rsync/src/rsync-3.1.3.tar.gz
2. decompression
   tar -xvf rsync-3.1.3.tar.gz
3. Enter the unzipped directory
4. To configure
   ./configure --prefix=/usr/local/rsync/
5. compile
   make
6. install
   make install

Configure server conf

vi /etc/rsyncd.conf
Modify the following content according to your own situation and then copy it

# Minimal configuration file for rsync daemon 
# See rsync(1) and rsyncd.conf(5) man pages for help 
# This line is required by the /etc/init.d/rsyncd script 

uid = root
gid = root
use chroot = false # Is it limited to this directory , The default is true, When there is a soft connection , Need to be changed to fasle, If true Limit it to the default directory of the module 
read only = yes # Is it read-only , If it is no Words , The customer service end fails to push to the service end , It should be changed to yes

#limit access to private LANs 
hosts allow= # Client address 
hosts deny=*
max connections = 5

#This will give you a separate log file 
log file = /mnt/log/rsync.log
#This will log every file transferred - up to 85,000+ per user, per sync 
transfer logging = yes
log format = %t %a %m %f %b
syslog facility = local3
timeout = 900
ignore nonreadable = yes
dont compress = .gz .tgz .zip .z .Z .rpm .deb .bz2

[test]
path = /home/back
comment = files backup
list=no
ignore errors
auth users = root
secrets file = /usr/local/rsync/rsyncd.secrets
#exclude =

Configure the server user password file

vi rsyncd.secrets
Here, you only need to match the configuration file 【test】 In the module secrets file The corresponding configuration items are consistent
The format of the content is user name : password
for example root:root123

Permission to modify user password file

chmod 600 /usr/local/rsync/rsyncd.secrets

Start the server program , Run in daemons mode

Get into bin Catalog , perform ./rsync --daemon You can start
You can confirm the successful startup by checking the port number
netstat -antp|grep 873
About how to restart the server daemon
direct kill Drop the process and restart it , It is so violent

The client performs synchronization test

rsync -vzrtlopg --progress [email protected] Server side IP:: Module name /path/ --password-file=/etc/rsyncd.passwd
Command parsing ：
-v, --verbose Detailed mode output .
-z, --compress Compress the backup files during transmission .
-r, --recursive Deal with subdirectories in recursive mode .
-t, --times Keep file time information .
-l, --links Keep the soft links .
-o, --owner Keep file owner information .
-p, --perms Keep file permissions .
-g, --group Keep file group information .
Because what we do is redundant active and standby , So don't add --delete Delete those DST in SRC No documents .
If you need to do a full synchronization , You need to add --delete command , That is, the files deleted by the server , The client will also delete .

Scheduled backup

Add the above command to the scheduled task , You can achieve daily standby .

Step on the hole guide

1. Daemon mode must be started with --daemon Parameters
2. If the password of the client is also stored in the file , As shown above , Note that the client password file is different from the server password file , The client does not need a user name , Just a password .