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Thread: Users configuration on CentOS

  1. #1
    Join Date
    Mar 2011
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    22

    Users configuration on CentOS

    I need some help to understand the user config in CentOS. I am just new to CentOS and working with certain storage material. There are some defaults groups that came with it and those were added by the previous users. Now first I need some basic steps to configure and create new users account in the same. Second what are other things can be done here with the user groups. User permissions are also a kind of major lookout here which is needed to be configured properly. Thanks in advance.

  2. #2
    Join Date
    Nov 2009
    Posts
    1,269

    Re: Users configuration on CentOS

    I will emphasize on the root account in this which is basically an account with full privileges in a system. It is a user account from which you can do any task on any user. The danger is twofold because of this, because we can hurt others or ourselves to make a mistake from the root account. Therefore, it is always recommended to use it when absolutely necessary, never for normal tasks. There are other more admin based task that you can perform with the same.

  3. #3
    Join Date
    Nov 2009
    Posts
    1,292

    Re: Users configuration on CentOS

    There are two ways to add users and groups on Linux CentOS, in the case of operating in graphics mode you can go to, System Settings > Server Settings > Samba. here there you can create groups and users in Linux. But if using the command line in text mode would have to create a user of this form to add a user on CentOS or RHEL. You will need to run # useradd -s /bin/bash usuario-x, # passwd usuario-x and # smbpasswd -a usuario-x. And for adding new user group you will need to run command - # grupadd -r .

  4. #4
    Join Date
    Nov 2008
    Posts
    1,185

    Re: Users configuration on CentOS

    When you add a user or group with the command useradd or groupadd respectively, the contents of these files is interesting. The control users and groups is a central element of system administration for linux based systems. Users can be either people, meaning accounts tied to physical users, or accounts which exist for use by applications specifiers. Groups are logical expressions which allow for some organization, tying users together for a common goal. Users within a given group can read, write and execute files belonging to this group.

  5. #5
    Join Date
    May 2008
    Posts
    681

    Re: Users configuration on CentOS

    Each user and each group is assigned a unique identifier number call a userid (UID) and groupid (GID). The user who creates a file becomes the owner and group owner of the file. This file reoit also spares permissions to read, write, and execute for owner, group, or any other user. The owner of the file can only be modified by the superuser. The group has a `file can be modified by the super-user permissions on CASC they can be modified by both the root and the owner of file.

  6. #6
    Join Date
    Nov 2009
    Posts
    865

    Re: Users configuration on CentOS

    Linux based system has support fo access control lists which is also knows as ACLs for files and directories allowing Defines permissions for user data s out of the owner. To obtain more information about using ACLs.a The management of users is one of the most important tasks that system administrators must perform include proper management of users and groups as well as effective management of file permissions.

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