[Ubuntu] the permissions of lampp mysql and phpmyadmin

After I run this command in Ubuntu:

  
    

   
     
   
     sudo chmod 
   
     777
   
      
   
     -
   
     R 
   
     /
   
     opt
   
     /
   
     lampp
  
    

Then I start the lampp

  
    

   
     
   
     sudo 
   
     /
   
     opt
   
     /
   
     lampp
   
     /
   
     lampp start
  
    

I got the warnning:

代码

   
     

    
      
    
      Starting XAMPP 
    
      for
    
       Linux 
    
      1.7
    
      .3a...
XAMPP: Starting Apache with SSL (and PHP5)...
XAMPP: Starting MySQL...
Warning: World
    
      -
    
      writable config file '
    
      /
    
      opt
    
      /
    
      lampp
    
      /
    
      etc
    
      /
    
      my.cnf' is ignored
Warning: World
    
      -
    
      writable config file '
    
      /
    
      opt
    
      /
    
      lampp
    
      /
    
      etc
    
      /
    
      my.cnf' is ignored
XAMPP: Starting ProFTPD...
XAMPP 
    
      for
    
       Linux started.
   
     

Then I visite the phpmyadmin in the browser with : http://127.0.0.1/phpmyadmin, I also got the error:

  
    

   
     
   
     Wrong permissions on configuration file, should not be world writable!
  
    

 

The resolved:

  
    

   
     
   
     sudo chmod 
   
     755
   
      
   
     -
   
     R 
   
     /
   
     opt
   
     /
   
     lampp
  
    

 

That is to say, We can set the 777 permissions to the /opt/lampp because the security reason then mysql can't start.