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I would like to set permission control on my server for user on Linux CentOS6
Anyone know it from this tutorial link,

http://www.computerhope.com/unix/uchmod.htm

dxxxyyyzzz, Where  d is directory, xxx for server owner, yyy for group user, zzzz for outside users.

When I did " chmod 700 mydir"  on linux shell that I want to let my own only  
access the mydir for r,w,x permsision and other users in internet could not access this directory

But I tried it on my browser as users and other one can access this directory's index.php.

Why  after 700 change, all users can access these diretory?

I thought the issue might be caused by different distribution of Linux such as Centos

It might be not
dxxxyyyzzz or it should be dzzzyyyxxx,

But when I tried "chmod 007 mydir", all users and  I (am the owner) that can
Not access the directory's index.php  Why  ?

And last question, even I can not control group user access , Why and how ?

Please advise
Duncan

For a webserver (apache) anyone browsing your site is getting the same user-permissions as your webserver, so if you allow your webserver to access a file, the whole world can access that file. So it's way better to protect files using the webserver configuration, either by the configfiles or a local .htaccess file where you can deny/allow access to a file or directory. You can also specify ipadresses or users (if you use authentication), and you can also completely disable the automatic indexing if you like:

<Files private.html>
   Order allow,deny
   Deny from all
</Files>

or

<Directory /var/web/dir1>
   Order allow,deny
   Deny from all
</Directory>

or to disable indexing:

<Directory /var/web/dir1>
    Options -Indexes
</Directory>

See http://httpd.apache.org/docs/2.2/howto/access.html
or https://httpd.apache.org/docs/2.2/sections.html


But another thing you can check is for file ACL parameters as well as they overrule the standard owner-group-other settings on a file.

Use:  getfacl <filename> for that.
and use setfacl to change the acl rules on a file.