October 27, 2011
I stumbled upon this problem when I was helping my friend to setup Apache server on Red Hat. Let us learn a few things about UNIX user access first.
Access control list in UNIX was first introduced by Hewlett Packard (my current employer) via its product, HP-UX. User access control is defined as a list of permissions attached to an object. In our context here, an object is a user or a group of user. In UNIX, there are Groups and Users associated to one or more groups. As a Root user, we can assign permission to a Group.
But but, what is a ROOT???
Alright, Root is a group with absolute control to the system. Root is also a default user for a UNIX system. When you installed a UNIX-based operating system, they will automatically create a root user and you can use this user to create another user or perform any administrative tasks. Most of UNIX-based operating system nowadays is disabling their root user due to security concern. Example of UNIX-based operating system with root-disabled is Ubuntu. As a root user, you can modified system files, create user, adding group, etc. So, be absolute careful when dealing with root user.
Next is I want to show you how to create a group and user. To create a group is pretty simple. You just run this command:
I stumbled upon this problem when I was helping my friend to setup Apache server on Red Hat. Let us learn a few things about UNIX user access first.
Access control list in UNIX was first introduced by Hewlett Packard (my current employer) via its product, HP-UX. User access control is defined as a list of permissions attached to an object. In our context here, an object is a user or a group of user. In UNIX, there are Groups and Users associated to one or more groups. As a Root user, we can assign permission to a Group.
But but, what is a ROOT???
Alright, Root is a group with absolute control to the system. Root is also a default user for a UNIX system. When you installed a UNIX-based operating system, they will automatically create a root user and you can use this user to create another user or perform any administrative tasks. Most of UNIX-based operating system nowadays is disabling their root user due to security concern. Example of UNIX-based operating system with root-disabled is Ubuntu. As a root user, you can modified system files, create user, adding group, etc. So, be absolute careful when dealing with root user.
Next is I want to show you how to create a group and user. To create a group is pretty simple. You just run this command:
