CentOS Essentials

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CentOS Essentials is an online book designed to provide everything a user needs to know to install, use and administer a CentOS 5 Linux system.

About CentOS Essentials Performing a Clean Disk CentOS Installation Trying CentOS without Installing Obtaining the CentOS Installation Media Installing CentOS Partitioning a Disk for CentOS Configuring Networking Settings Timezone and the Root Password Package Selection The Physical Installation Final Configuration Steps Performing a CentOS Network Installation CentOS Network Installation Requirements Configuring the Network Installation Starting the CentOS Network Installation Installing CentOS with Windows in Dual Boot Environment Partition Resizing Shrinking a Windows XP Partition Choosing an Operating System at Boot Time Editing the CentOS Boot Menu Accessing the Windows Partition from Linux Allocating a Windows Disk Partition to CentOS Deleting the Windows Partition from the Disk Formatting the Unallocated Disk Partition Editing the Boot Menu Mounting the New Partition Logging into the CentOS GNOME Desktop Configuring CentOS GNOME Screen Resolution and Multiple Monitors Configuring the Display Resolution Configuring Multiple Monitors A Guided Tour of the CentOS GNOME Desktop The CentOS GNOME Desktop The Desktop Background The Desktop Panels Changing the CentOS GNOME Desktop Background Changing the CentOS GNOME Desktop Background Selecting a Background from the Wallpaper List Creating a Solid or Graded Background Specifying a Background Image Installing and Customizing CentOS Desktop Themes What is a Desktop Theme? Changing the CentOS Desktop Theme Downloading and Installing a Theme Creating a Custom Theme Package Configuring CentOS Desktop Fonts Font Options on CentOS Changing Font Settings Font Rendering Settings Advanced Font Rendering Accessing the System Font Folder Configuring the CentOS Desktop Panels What are Desktop Panels Changing the Position of a Panel Adding and Deleting Desktop Panels Changing the Appearance of a Desktop Panel Adding Items to a GNOME Desktop Panel Adding Menus to a Panel Changing the Number of CentOS Desktop Workspaces Configuring the CentOS Desktop Menu System Customizing a CentOS Desktop Menu Moving Menu Items Adding and Deleting a Menu Item Browsing My Computer, Files and Folders on the CentOS Desktop Accessing Nautilus Nautilus and the Computer Icon Adding Emblems to Files and Folders Changing File and Folder Permissions Renaming and Deleting Files and Folders Configuring the CentOS GNOME File Manager Displaying Icons or Lists Configuring the List View Configuring the Icon View CentOS Startup Programs and Session Configuration Session Managed and Non-Session Managed Programs Understanding Sessions Creating a New Session Configuring Session Preferences Configuring the Current Session Configuring Startup Programs CentOS Desktop Keyboard Shortcuts Viewing Keyboard Shortcuts Changing a Shortcut Disabling a Keyboard Shortcut Managing CentOS Users and Groups Adding a New User to a CentOS System Editing the Properties of a User Deleting a User from a CentOS System Adding a New Group to a CentOS System Modifying a CentOS Group Deleting a Group from a CentOS System Basic CentOS Firewall Configuration Configuring a Basic CentOS Firewall Enabling and Disabling the Firewall Configuring Firewall Port Settings Configuring Other Ports Firewall Configuration from a Terminal using lokkit Trusted Interfaces Masquerading Remote Access to the CentOS Desktop Installing Remote Desktop Support Activating Remote Desktop Access Secure and Insecure Remote Desktop Access Firewall Configuration Accessing a Remote CentOS Desktop using vncviewer Accessing a Remote CentOS Desktop from a Windows System Establishing a Secure Remote Desktop Session Establishing a Secure Remote Desktop Session from a Windows System Creating Additional Desktops Shutting Down a Desktop Session Configuring the Remote Desktop Environment Configuring CentOS Remote Access using SSH Installing SSH on an CentOS System Configuring the CentOS Firewall to Allow SSH Connections Using SSH on CentOS Copying files using SSH Disabling the SSH Server Displaying CentOS Applications Remotely (X11 Forwarding) Requirements for Remotely Displaying Applications Remotely Displaying a CentOS Application Trusted X11 Forwarding Compressed X11 Forwarding Using NFS to Share CentOS Folders with Remote Linux and UNIX Systems Ensuring NFS Services are Running on CentOS Configuring the CentOS Firewall to Allow NFS Traffic Specifying the Folders to be Shared Accessing Shared CentOS Folders Mounting an NFS Filesystem on System Startup Unmounting an NFS Mount Point Sharing CentOS Files with Remote Windows Systems Samba and Samba Client Installing Samba on a CentOS System Starting the Samba Service on CentOS Configuring the CentOS Firewall to Enable Samba Configuring Samba Users and Resource Sharing Accessing Windows Shares from CentOS Configuring a CentOS Based Web Server Requirements for Configuring a Web Server Installing the Apache Web Server on CentOS Starting the Apache Web Server Testing the Web Server Configuring the Apache Web Server for Your Domain Web Server and Firewall Issues Configuring a CentOS Postfix Email Server The structure of the Email System Mail User Agent Mail Transfer Agent Mail Delivery Agent SMTP Configuring a CentOS Email System Postfix Pre-Installation Steps Installing Postfix on CentOS Configuring Postfix Starting Postfix on a CentOS System Configuring a CentOS Mail Client (Evolution) An Overview Configuring Evolution to Receive Mail from a Local Postfix Server Configuring Evolution to Receive Mail from a Remote POP Server Configuring Evolution to Send Mail Sending and Receiving GMail Email via POP on a CentOS System Configuring a GMail Account for POP Access Configuring Evolution to Receive GMail Messages Configuring Evolution to Send GMail Messages Installing and Configuring CentOS Xen Virtualization Full Virtualization vs. Para-Virtualization Checking Xen Hardware Compatibility Preparing CentOS for Xen Virtualization Building a CentOS Xen Guest System Using Xen Full Virtualization to Run Windows on CentOS Hardware Requirements for Xen-based Full Virtualization on CentOS Preparing the Installation Image Creating the New Virtual Machine Configuring Xen Virtualization Method Selecting Installation Media Configuring Storage Configuring Network Access CPU and Memory Allocation Creating and Starting the New Xen Virtual Machine Managing and Monitoring CentOS based Xen Guest Systems Starting and Stopping Xen Guest Systems Pausing a Xen Guest Operating System Changing Xen Guest Operating System Settings Monitoring Virtual Machine Performance Managing Xen on CentOS using the xm and virsh Command-line Tools xm Command-line vs virsh Shell Listing Guest System Status Starting a Xen Guest System Connecting to a Running Xen Guest System Shutting Down a Guest System Pausing and Resuming a Guest System Suspending and Resuming a Guest OS Saving and Restoring Xen Guest Systems Rebooting a Guest System Configuring the Memory Assigned to a Xen Guest OS Migrating a Domain to a Different Host Installing KVM on CentOS and Configuring a Network Bridge KVM Hardware Requirements 32-bit Support for KVM on CentOS Preparing CentOS for KVM Virtualization Verifying the KVM Installation Virtual Networks and Network Bridges Creating a Network Bridge Creating a CentOS KVM Virtual Machine Starting the Virtual Machine Manager Creating the New CentOS based KVM Virtual Machine Configuring the Installation Method Configuring the KVM Virtual Storage Configuring KVM Network Settings Configuring KVM Virtual Machine Memory and CPU Settings Starting the New KVM Virtual Machine Installing a CentOS KVM Guest OS from the Command-line (virt-install) Running virt-install to Build the KVM Guest System An Example CentOS virt-install Command Starting the Virtual Machine from the Command Line Managing and Monitoring CentOS based KVM Guest Systems Starting and Stopping CentOS based KVM Guest Systems Pausing a KVM Guest Operating System Changing KVM Virtual Guest System Settings Monitoring Virtual Machine Performance Monitoring Host Performance Adding a New Disk Drive to a CentOS System Mounted File Systems or Logical Volumes Getting Started Finding the New Hard Drive in CentOS Creating Linux Partitions Creating a File System on a CentOS Disk Partition Mounting a File System Configuring CentOS to Automatically Mount a File System Adding a New Disk to a CentOS Volume Group and Logical Volume An Overview of Logical Volume Management (LVM) Volume Group (VG) Physical Volume (PV) Logical Volume (LV) Physical Extent (PE) Logical Extent (LE) Getting Information and Logical Volumes Adding Additional Space to a CentOS Volume Group from the Command Line

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