Red Hat®. Enterprise Linux® 6. Administration. Real World Skills for Red Hat. Administrators. Sander van Vugt. D o w n lo a d fro m. W o w! e. B o o k. < w w w. Detailed notes on the changes implemented in Red Hat Enterprise Linux Deployment, Configuration and Administration of Red Hat Enterprise Linux 6. Red Hat, as the licensor of this document, waives the right to enforce, and agrees not to assert,. Section 4d of CC-BY-SA to the fullest extent.
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Red Hat Enterprise Linux 6 Essentials is designed to provide detailed information on the use and administration of the RHEL 6 distribution. For beginners, the. Linux professionals who need a go-to guide on version 6 of Red Hat Enterprise Linux (RHEL) will find what they need in this comprehensive Sybex book. Sander is the author of the best-selling Red Hat Certified and also of the Red Hat. Certif Red Hat Enterprise Linux 6 Storage Administration Guide.
To access the User Manager tool, select the desktop System menu and choose Users and Groups from the Administration sub-menu. To administer the group settings click on the Groups tab. The Group panel will appear, listing all the groups available on the system: To add a new group click on the Add Group toolbar button and enter the name of the group you wish to add and press OK.
Once the new group has been added, select the group in the list and click on the Properties button in the toolbar. Add the users that should belong to this group by checking the box next to each user name in the list. For example the following screenshot shows user demo being added to the new accounts group: Click on OK to add the user as a member of the new group. The resulting Group properties dialog shown below allows basic settings such as the group name and group members to be changed.
To add an existing user to an existing group from the command-line: su - usermod -G accounts john To add an existing user to a number of existing groups: su - usermod -G accounts,sales,support john Note that the above commands remove the user from any supplementary groups which are not listed after the -G, but to which the user is currently a member.
To retain any current group memberships, use the -a flag to append the new group memberships: su - usermod -a -G accounts,sales,support john Deleting a Group from an RHEL System A group may be deleted from a system using the groupdel utility: su - groupdel accounts Note that if the group to be deleted is the primary group for any user it cannot be deleted. The user must first be deleted, or assigned a new primary group using the usermod command: su - usermod -g sales john groupdel accounts eBookFrenzy.
Red Hat is the Linux market leader, and Red Hat administrators are in demand This Sybex guide is a comprehensive resource on Red Hat Enterprise Linux administration and useful for those preparing for one of the Red Hat certification exams Covers setting up and managing web and mail services, using RHEL in enterprise environments, securing RHEL, and optimizing storage to fit your environment Explores advanced RHEL configurations, including virtualization and high availability Red Hat Enterprise Linux 6 Administration is the guide Linux professionals and Red Hat administrators need to stay current on the newest version.
Instructor View Instructor Companion Site. About the Author Sander van Vugt is an independent technical trainer, consultant, and author of numerous titles on Linux.
Permissions Request permission to reuse content from this site. Error in Exercise 3. It should read: Errors in Table 3. The "Command" column should read: Errors in Exercise 3.
Error in Exercise 4. Error in Exercise 5. Exercise 6. Without it, selinux will not allow sshd to offer its services on the default http port. Error in Exercise 6.
Exercise 7. The step should read: Before setting the permissions, change the owners of these directories to chown lisa. Other common operating systems of the era had ways to divide a storage device into multiple directories or sections, but they had a fixed number of levels, often only one level. Several major proprietary operating systems eventually added recursive subdirectory capabilities also patterned after Multics. Making the command interpreter an ordinary user-level program, with additional commands provided as separate programs, was another Multics innovation popularized by Unix.
Since the shell and OS commands were "just another program", the user could choose or even write their own shell. New commands could be added without changing the shell itself.
Unix's innovative command-line syntax for creating modular chains of producer-consumer processes pipelines made a powerful programming paradigm coroutines widely available. Many later command-line interpreters have been inspired by the Unix shell. A fundamental simplifying assumption of Unix was its focus on newline - delimited text for nearly all file formats. The focus on text for representing nearly everything made Unix pipes especially useful, and encouraged the development of simple, general tools that could be easily combined to perform more complicated ad hoc tasks.
The focus on text and bytes made the system far more scalable and portable than other systems. Over time, text-based applications have also proven popular in application areas, such as printing languages PostScript , ODF , and at the application layer of the Internet protocols , e.