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by Jamie Cameron
Managing Linux® Systems with Webmin™ System Administration and Module Development
Copyright
Bruce Perens' Open Source Series
Introduction to Webmin
What is Webmin?
Who Should Use Webmin?
How and Why Was it Developed?
What is this Book About?
Who Should Read this Book?
Conventions Used in this Book
Acknowledgments
Installing Webmin
Downloading Webmin for Your System
Installing the RPM Package
Installing the tar.gz Package
Installing the Solaris Package
The Webmin User Interface
Uninstalling Webmin
Summary
Securing Your Webmin Server
Network Security
SSL Encryption
Requesting a Valid SSL Certificate
Summary
Users and Groups
Introduction to UNIX Users and Groups
The Users and Groups Module
Creating a New User
Editing an Existing User
Deleting a User
Creating a New Group
Editing an Existing Group
Deleting a Group
Viewing Recent and Current Logins
Reading Users' Email
Creating Users from Batch Files
Configuring the Users and Groups Module
Before and After Commands
Module Access Control
Other Operating Systems
Summary
Disk and Network Filesystems
Introduction to Filesystems
The Disk and Network Filesystems Module
Mounting an NFS Network Filesystem
Mounting an SMBFS Windows Networking Filesystem
Mounting a Local ext2 or ext3 Hard Disk Filesystem
Mounting a Local Windows Hard Disk Filesystem
Adding Virtual Memory
Automounter Filesystems
Editing or Removing an Existing Filesystem
Listing Users of a Filesystem
Module Access Control
Configuring the Disk and Network Filesystems Module
A Comparison of Filesystem Types
Other Operating Systems
Summary
NFS File Sharing
Introduction to File Sharing with NFS
The NFS Exports Module
Exporting a Directory
Editing or Deleting an NFS Export
NFS on Solaris
NFS on BSD, MacOS X, and OpenServer
NFS on Irix
Summary
Disk Quotas
Introduction to Disk Quotas
The Disk Quotas Module
Enabling Quotas for a Filesystem
Disabling Quotas for a Filesystem
Setting Quotas for a User or Group
Copying Quotas to Multiple Users
Setting Grace Times
Setting Default Quotas for New Users
Other Operating Systems
Configuring the Disk Quotas Module
Module Access Control
Summary
Partitions, RAID, and LVM
Introduction to Hard Disk Partitions
The Partitions on Local Disks Module
Adding and Formatting a New Partition
Creating a New Filesystem
Partition Labels
Deleting or Changing a Partition
Module Access Control
Other Operating Systems
Introduction to RAID
The Linux RAID Module
Introduction to LVM
The Logical Volume Management Module
Creating a New Volume Group
Adding and Removing a Physical Volume
Creating and Deleting a Logical Volume
Resizing a Logical Volume
Creating a Snapshot
Summary
Bootup and Shutdown
Introduction to the Linux Boot Process
The Bootup and Shutdown Module
Configuring an Action to Start at Bootup
Starting and Stopping Actions
Adding a New Action
Rebooting or Shutting Down Your System
Configuring the Bootup and Shutdown Module
Other Operating Systems
The SysV Init Configuration Module
Summary
Scheduled Commands
Introduction to Cron Jobs
The Scheduled Cron Jobs Module
Creating a New Cron Job
Editing a Cron Job
Controlling Users' Access to Cron
Module Access Control Options
Configuring the Scheduled Cron Jobs Module
Other Operating Systems
The Scheduled Commands Module
Creating a New Scheduled Command
Summary
Process Management
Introduction to Processes
The Running Processes Module
Viewing, Killing, or Reprioritizing a Process
Searching for Processes
Running a Process
Module Access Control Options
Other Operating Systems
Summary
Software Packages
Introduction to Packages
The Software Packages Module
Installing a New Package
Finding and Removing a Package
Updating on Debian Linux
Updating on Red Hat Linux
Other Operating Systems
Summary
System Logs
Introduction to Logging
The System Logs Module
Adding a New Log File
Editing or Deleting a Log File
Module Access Control
Other Operating Systems
Summary
Filesystem Backups
Introduction to Backups with Dump
The Filesystem Backup Module
Adding a New Backup
Making a Backup
Editing or Deleting a Backup
Restoring a Backup
Configuring the Filesystem Backup Module
Other Operating Systems
Summary
Internet Services
Introduction to Internet Services
The Internet Services and Protocols Module
Enabling an Internet Service
Creating Your Own Internet Service
Creating and Editing RPC Programs
Configuring the Internet Services and Protocols Module
Other Operating Systems
The Extended Internet Services Module
Enabling or Editing an Extended Internet Service
Creating an Extended Internet Service
Editing Default Options
Summary
Network Configuration
Introduction to Linux Networking
Viewing and Editing Network Interfaces
Adding a Network Interface
Configuring Routing
Changing the Hostname or DNS Client Settings
Editing Host Addresses
Module Access Control
Other Operating Systems
Summary
Network Information Service
Introduction to NIS
Becoming an NIS Client
Setting Up an NIS Master Server
Editing NIS Tables
Securing Your NIS Server
Setting Up an NIS Slave Server
Configuring the NIS Client and Server Module
NIS on Solaris
Summary
PPP Server Configuration
Introduction to PPP on Linux
Configuring a PPP Server
Managing PPP Accounts
Restricting Access by Caller ID
Module Access Control
Summary
Firewall Configuration
Introduction to Firewalling with IPtables
The Linux Firewall Module
Allowing and Denying Network Traffic
Changing a Chain's Default Action
Editing Firewall Rules
Creating Your Own Chain
Setting Up Network Address Translation
Setting Up a Transparent Proxy
Setting Up Port Forwarding
Firewall Rule Conditions
Configuring the Linux Firewall Module
Summary
Setting the Date and Time
The System Time Module
Changing the System Time
Change the Hardware Time
Synchronizing Times with Another Server
Module Access Control
Other Operating Systems
Summary
Boot Loader Configuration
Introduction to Boot Loaders
The Linux Bootup Configuration Module
Booting a New Kernel with LILO
Booting Another Operating System with LILO
Editing Global LILO Options
The GRUB Boot Loader Module
Booting a New Linux Kernel or BSD with GRUB
Booting Another Operating System with GRUB
Editing Global GRUB Options
Installing GRUB
Configuring the GRUB Boot Loader Module
Summary
Printer Administration
Introduction to Printing on Linux
The Printer Administration Module
Adding a New Printer
Editing an Existing Printer
Managing Print Jobs
Configuring the Printer Administration Module
Module Access Control
Other Operating Systems
Summary
Voicemail Server Configuration
The Voicemail Server Module
Configuring Your System as an Answering Machine
Listening to Recorded Messages
Setting a Greeting Message
Summary
Remote Shell Login
The SSH/Telnet Login Module
Configuring the SSH/Telnet Login Module
The Command Shell Module
The Shell In A Box Module
Summary
Running Custom Commands
The Custom Commands Module
Creating a New Command
Parameter Types
Creating a New File Editor
Module Access Control
Configuring the Custom Commands Module
Summary
Webmin's File Manager
The File Manager Module
Navigating Directories and Viewing Files
Manipulating Files
Creating and Editing Files
Editing File Permissions
Creating Links and Directories
Finding Files
Editing EXT File Attributes
Editing XFS File Attributes
Editing File ACLs
Sharing Directories
Module Access Control
Summary
Perl Modules
Introduction to Perl Modules
Perl Modules in Webmin
Installing a Perl Module
Viewing and Removing a Perl Module
Configuring the Perl Modules Module
Summary
Status Monitoring with Webmin
The System and Server Status Module
Adding a New Monitor
Monitor Types
Setting Up Scheduled Monitoring
Module Access Control
Configuring the System and Server Status Module
Summary
Apache Web Server Configuration
Introduction to Apache
The Apache Webserver Module
Starting and Stopping Apache
Editing Pages on Your Web Server
Creating a New Virtual Host
Setting Per-Directory Options
Creating Aliases and Redirects
Running CGI Programs
Setting Up Server-Side Includes
Configuring Logging
Setting Up Custom Error Messages
Adding and Editing MIME Types
Password Protecting a Directory
Restricting Access by Client Address
Encodings, Character Sets, and Languages
Editing .htaccess Files
Setting Up User Web Directories
Configuring Apache as a Proxy Server
Setting Up SSL
Viewing and Editing Directives
Module Access Control
Configuring the Apache Webserver Module
Summary
DNS Server Configuration
Introduction to the Domain Name System
The BIND DNS Server Module
Creating a New Master Zone
Adding and Editing Records
Record Types
Editing a Master Zone
Creating a New Slave Zone
Editing a Slave Zone
Creating and Editing a Forward Zone
Creating a Root Zone
Editing Zone Defaults
Configuring Forwarding and Transfers
Editing Access Control Lists
Setting Up Partial Reverse Delegation
Using BIND Views
Module Access Control
Configuring the BIND DNS Server Module
The BIND 4 DNS Server Module
Summary
CVS Server Configuration
Introduction to CVS
The CVS Server Module
Setting Up the CVS Server
Using the CVS Server
Adding and Editing Users
Limiting User Access
Configuring the CVS Server
Browsing the Repository
Configuring the CVS Server Module
Summary
DHCP Server Configuration
Introduction to the Dynamic Host Configuration Protocol
The ISC DHCP Server
The DHCP Server Module
Adding and Editing Subnets
Viewing and Deleting Leases
Editing Global Client Options
Adding and Editing Fixed Hosts
Adding and Editing Shared Networks
Adding and Editing Groups
Module Access Control
Configuring the DHCP Server Module
Summary
Downloading Email with Fetchmail
Introduction to Fetchmail
The Fetchmail Mail Retrieval Module
Adding a New Mail Server to Check
Downloading Email
Running the Fetchmail Daemon
Editing Global Settings
Module Access Control
Configuring the Fetchmail Mail Retrieval Module
Summary
Managing Majordomo Mailing Lists
Introduction to Mailing Lists and Majordomo
The Majordomo List Manager Module
Using Other Mail Servers
Creating a Mailing List
Managing List Members
Editing List Information, Headers, and Footers
Editing Subscription Options
Editing Forwarded Email Options
Editing List Access Control
Moderating and Maintaining a Mailing List
Deleting a Mailing List
Creating a Digest List
Editing Digest Options
Editing Global Majordomo Options
Module Access Control
Configuring the Majordomo List Manager Module
Summary
The MySQL Database
Introduction to MySQL
The MySQL Database Server Module
Creating a New Database
Creating a New Table
Adding and Editing Fields
Field Types
Viewing and Editing Table Contents
Deleting Tables and Databases
Executing SQL Commands
Backing Up and Restoring a Database
Managing MySQL Users
Managing Database, Host, Table, and Field Permissions
Module Access Control
Configuring the MySQL Database Server Module
Summary
The PostgreSQL Database
Introduction to PostgreSQL
The PostgreSQL Database Server Module
Creating a New Database
Creating a New Table
Adding and Editing Fields
Deleting a Field
Field Types
Viewing and Editing Table Contents
Deleting Tables and Databases
Executing SQL Commands
Backing Up and Restoring a Database
Managing PostgreSQL Users
Managing PostgreSQL Groups
Restricting Client Access
Editing Object Privileges
Module Access Control
Configuring the PostgreSQL Database Server Module
Summary
Configuring Sendmail
Introduction to Internet Email
The Sendmail Configuration Module
Editing Local Domains and Domain Masquerading
Managing Email Aliases
Configuring Relaying
Managing Virtual Address Mappings
Configuring Domain Routing
Editing Global Sendmail Options
Viewing the Mail Queue
Reading Users' Email
Adding Sendmail Features with M4
Creating Autoreply Aliases
Creating Filter Aliases
Sendmail Module Access Control
Configuring the Sendmail Configuration Module
Summary
Configuring Qmail
Introduction to Qmail
The Qmail Configuration Module
Editing Local Domains
Managing Email Aliases
Configuring Relaying
Managing Virtual Mappings
Configuring Domain Routing
Editing Global Qmail Options
Editing Mail User Assignments
Viewing the Mail Queue
Reading Users' Email
Configuring the Qmail Configuration Module
Summary
Analyzing Log Files
The Webalizer Logfile Analysis Module
Editing Report Options
Generating and Viewing a Report
Reporting on Schedule
Adding Another Log File
Editing Global Options
Module Access Control
Summary
The ProFTPD Server
Introduction to FTP and ProFTPD
The ProFTPD Server Module
Running ProFTPD from inetd or xinetd
Using the ProFTPD Server Module
Creating Virtual Servers
Setting Up Anonymous FTP
Restricting Users to Their Home Directories
Limiting Who Can Log In
Setting Directory Listing Options
Message and Readme Files
Setting Per-Directory Options
Restricting Access to FTP Commands
Configuring Logging
Limiting Concurrent Logins
Restricting Clients by IP Address
Limiting Uploads
Manually Editing Directives
Configuring the ProFTPD Server Module
Summary
The WU-FTPD Server
Introduction to WU-FTPD
The WU-FTPD Server Module
Limiting Who Can Log In
Setting Up Anonymous FTP
Managing User Classes
Denying Access to Files
Setting Up Guest Users
Editing Directory Aliases
Message and Readme Files
Configuring Logging
Limiting Concurrent Logins
Restricting Clients by IP Address
Restricting Access to FTP Commands
Configuring the WU-FTPD Server Module
Summary
SSH Server Configuration
Introduction to SSH
The SSH Server Module
Restricting Access to the SSH Server
Network Configuration
Authentication Configuration
Editing Client Host Options
Setting Up SSH for New Users
Configuring the SSH Server Module
Summary
Windows File Sharing with Samba
Introduction to SMB and Samba
The Samba Windows File Sharing Module
Managing Samba Users
Adding a New File Share
Adding a New Printer Share
Viewing and Disconnecting Clients
Editing Share Security Options
Editing File Permission Settings
Editing File Naming Options
Editing Other File Share Options
Editing Printer Share Options
Editing Share Defaults
Configuring Networking
Configuring Authentication
Configuring Printers
Accessing SWAT from Webmin
Module Access Control
Configuring the Samba Windows File Sharing Module
Summary
Configuring the Squid Proxy Server
Introduction to Proxying and Squid
The Squid Proxy Server Module
Changing the Proxy Ports and Addresses
Adding Cache Directories
Editing Caching and Proxy Options
Introduction to Access Control Lists
Creating and Editing ACLs
Creating and Editing Proxy Restrictions
Setting Up Proxy Authentication
Configuring Logging
Connecting to Other Proxies
Clearing the Cache
Setting Up a Transparent Proxy
Viewing Cache Manager Statistics
Analyzing the Squid Logs
Module Access Control
Configuring the Squid Proxy Server Module
Summary
Filtering Email with Procmail
Introduction to Procmail
The Procmail Mail Filter Module
Setting Up Sendmail
Creating and Editing Actions
Creating and Editing Variable Assignments
Conditional Blocks and Include Files
Filtering Spam with SpamAssassin
Configuring the Procmail Mail Filter Module
Summary
Creating SSL Tunnels
Introduction to SSL and STunnel
The SSL Tunnels Module
Creating and Editing SSL Tunnels
Configuring the SSL Tunnels Module
Summary
Usermin Configuration
Introduction to Usermin
The Usermin Configuration Module
Starting and Stopping Usermin
Restricting Access to Usermin
Changing the Port and Address
Configuring the Usermin User Interface
Installing Usermin Modules
Changing the Default Language
Upgrading Usermin
Configuring Authentication
Editing Categories and Moving Modules
Changing and Installing Themes
Turning on SSL
Configuring Usermin Modules
Restricting Access to Modules
Limiting Who Can Log In
About the Usermin Modules
Configuring the Usermin Configuration Module
Summary
Cluster Software Management
Introduction to Webmin Clustering
The Cluster Software Packages Module
Registering a Server
Installing a Package
Searching for Packages
Deleting a Package
Exploring and Removing a Server
Refreshing the Package List
Configuring the Cluster Software Packages Module
Summary
Cluster User Management
The Cluster Users and Groups Module
Registering a Server
Creating a New User
Editing an Existing User
Deleting a User
Creating a New Group
Editing an Existing Group
Deleting a Group
Refreshing User and Group Lists
Synchronizing Users and Groups
Listing and Removing a Server
Configuring the Cluster Users and Groups Module
Summary
Cluster Webmin Configuration
The Cluster Webmin Configuration Module
Registering a Server
Creating a New Webmin User
Editing or Deleting a Webmin User
Creating a New Webmin Group
Editing or Deleting a Webmin Group
Editing the User or Group ACL for a Module
Installing a Module or Theme
Viewing and Deleting a Module or Theme
Refreshing User and Module Lists
Listing and Removing a Server
Configuring the Cluster Webmin Configuration Module
Summary
Webmin Configuration
The Webmin Configuration Module
Restricting Access to Webmin
Changing the Port and Address
Setting Up Logging
Using Proxy Servers
Configuring the Webmin User Interface
Installing and Deleting Webmin Modules
Cloning a Webmin Module
Changing Your Operating System
Editing the Program Path and Environment Variables
Changing Webmin's Language
Editing Main Menu Settings
Upgrading Webmin
Installing Updates to Webmin
Configuring Authentication
Editing Categories and Moving Modules
Changing and Installing Themes
Referrer Checking
Allowing Unauthenticated Access to Modules
Turning on SSL
Setting Up a Certificate Authority
Summary
Webmin Access Control
Introduction to Webmin Users, Groups, and Permissions
The Webmin Users Module
Creating a New Webmin User
Editing a Webmin User
Editing Module Access Control
Creating and Editing Webmin Groups
Requesting a Client SSL Key
Viewing and Disconnecting Login Sessions
Module Access Control
Configuring the Webmin Users Module
Summary
Webmin Servers
The Webmin Servers Index Module
Adding a Webmin Server
Editing or Deleting a Webmin Server
Using Server Tunnels
Broadcasting and Scanning for Servers
How RPC Works
Module Access Control
Configuring the Webmin Servers Index Module
Summary
Logging in Webmin
Introduction to Logging
The Webmin Actions Log Module
Displaying Logs
Summary
Webmin Module Development
Introduction
Required Files
Module CGI Programs
Module Configuration
Look and Feel
Design Goals
Online Help
Module Packaging
Summary and Learning More
Advanced Module Development
Module Access Control
User Update Notification
Internationalization
File Locking
Action Logging
Pre- and Post-Install Scripts
Functions in Other Modules
Remote Procedure Calls
Creating Usermin Modules
Summary
Inside the Scheduled Cron Jobs Module
Module Design and CGI Programs
The cron-lib.pl Library Script
Module Configuration Settings
The lang Internationalization Directory
The acl_security.pl Access Control Script
The log_parser.pl Log Reporting Script
The useradmin_update.pl User Synchronization Script
Summary
Creating Webmin Themes
Introduction to Themes
Overriding Images and Programs
Theme Functions
Summary
Inside the MSC Theme
Theme Design and Graphics
The index.cgi Program
The theme_header Function
The theme_footer Function
Summary
The Webmin API
API Functions
Summary
Index
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