Synchronize files using unison

Unison Is a cross platform file synchronization tool , It is very useful for synchronizing data between computers or storage devices .

Environmental Science

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• ​ ​Centos​​7(1): 192.168.43.165
• Centos7(2): 192.168.43.166
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install Unison

Install... In both systems epel Source , And then they all need to be installed unison：

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        [[email protected]_168_43_165 ~]# yum -y install epel-release
        
[[email protected]_168_43_165 ~]# yum makecache
        
[[email protected]_168_43_165 ~]# yum -y install unison
       
       

        
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Two operating system configurations ssh Password free login

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        [[email protected]_168_43_165 ~]# ssh-keygen
       
       

        
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Log in and copy

       

        [[email protected]_168_43_165 ~]# ssh-copy-id [email protected]
        
[[email protected]_168_43_165 ~]# cd ~/.ssh
        
[[email protected]_168_43_165 .ssh]# cat id_rsa.pub > authorized_keys
        
[[email protected]_168_43_165 .ssh]# scp id_rsa [email protected]:/root/.ssh
       
       

        
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How to use Unison

Unison Used to synchronize a group of files in a directory to another location with similar structure , The location can be a local host or a remote host .

Local file synchronization

stay root Create two folders under the home directory , One is "Files", One is "Backup".Files Create files in it , Synchronize to Backup Inside .

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        [[email protected]_168_43_165 ~]# mkdir Files Backup
        
[[email protected]_168_43_165 ~]# cd Files/
        
[[email protected]_168_43_165 Files]# touch file{1..10}.txt
       
       

        
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Now run ​​unison​​​ ​ command ​​, Synchronize files to Backup In the folder .

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        [[email protected]_168_43_165 ~]# unison -batch /root/Files /root/Backup
       
       

        
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Check it out. Backup Folder , I found that the files were synchronized .

Let's change it now Backup A file in a folder , Then add the given file , Last but not least, I'll do the same thing ​ ​ command ​​, See if it syncs to Files In the folder ：

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        [[email protected]_168_43_165 Backup]# echo "testtesttest" > file2.txt 
        
[[email protected]_168_43_165 Backup]# echo 'hello world!' > index.html
       
       

        
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perform ​​unison​​ command ：

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        [[email protected]_168_43_165 ~]# unison -batch /root/Files /root/Backup
       
       

        
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You can see Backup The contents in the folder are synchronized to Files Inside the

Remote file synchronization

If you need remote file synchronization , Must be installed on both local and remote servers Unison.

Now we have two servers root Create two folders under the directory , Used for synchronizing files .

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        #  Create a folder on the first server .
        
[[email protected]_168_43_165 ~]# mkdir Files
        
#  Create a folder on the second server .
        
[[email protected]_168_43_166 ~]# mkdir Files
       
       

        
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Use ​​-testServer​​ Option to test connectivity between local and remote servers .

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        [[email protected]_168_43_165 ~]# unison -testServer /root/Files ssh://[email protected]//root/Files
        
Contacting server...
        
Connected [//192_168_43_165//root/Files -> //192_168_43_166//root/Files]
       
       

        
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After connectivity is OK , We can execute the command to synchronize the file ：

Log in and copy

       

        [[email protected]_168_43_165 ~]# unison -batch /root/Files ssh://[email protected]//root/Files
       
       

        
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Look at the... On the second server ​​/root/Files​​ Folder , Is the file synchronized ：

summary

Unison Very easy to use , It doesn't take extra energy . It can be GUI And custom synchronization in any way in command line utilities . If you need to use a graphical interface , It can be executed in a desktop environment ​​unison-gtk-2.40​​ Open the graphical interface for configuration .