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Introduction. System Administration With Webmin. A brief overview of new era administration tool. Prepared by Henry Batula 12539114 Ni Xiao 12640223 Peter Greenup 12645736. What is Webmin?.

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system administration with webmin

System Administration With Webmin

A brief overview of new era administration tool

Prepared by

Henry Batula 12539114

Ni Xiao 12640223

Peter Greenup 12645736

what is webmin
What is Webmin?
  • Webmin is a web-based interface for system administration for Unix/Linux. Using any browser that supports tables and forms (and Java for the File Manager module), you can setup user accounts, Apache, DNS, file sharing and so on
  • Often considered equivalent to windows control panel
what is webmin cont d
What is Webmin (cont’d)
  • It is a user administration tool written by Jamie Cameron in Perl that is designed to be lightweight, functional, and easily extensible
  • It has been translated to 14 languages at the moment
  • It has been embraced by a number of hardware and operating system vendors as the default system administration tool(Linux-Mandrake 7.0)
  • It is extremely portable, offering support for more than 25 different Unix/Linux Operating Systems
what is webmin cont d1
What is Webmin? (cont’d)
  • It is very easily extended to support new features and options, due to it's open and well documented API
  • It also happens to be a fast and easy to use tool for general Unix/Linux system administration
  • It allows easy addition of new modules without changing any of the existing code
what is required
What is required
  • A simple web server, and a number of CGI programs which directly update system files like /etc/inetd.conf and /etc/passwd.
  • The web server and all CGI programs must be written in Perl version 5. This means that you only need a Perl binary to run it.
who webmin is for
Who Webmin is For
  • It is an excellent tool for both novice and experienced system administrators
  • When run from a local machine, it can help new users become familiar with the capabilities of a Linux system.
sections within webmin
Sections within Webmin
  • The individual modules of webim are found in 5 different sections.
      • Webmin
      • System
      • Servers
      • Networking
      • Hardware
      • and Others
webmin modules
Webmin modules
  • It uses modules, which are similar to plug-ins, and easily allow you to extend the base functions of Webmin.
  • It is divided into a number of modules that each allows to administer a single aspect of system
  • There are Currently 127 Modules
  • The standard modules provide a graphical interface for: Apache, Squid, Bind, NFS, man pages, Sendmail, Postfix, Samba
slide11

admin

Scheduled Cron Jobs

BIND 4 DNS Server

NFS Exports

Internet Services andProtocols

Bootup and ShutdownActions

Disk and NetworkFilesystems

Samba Windows File Sharing

Users, Groups and Passwords

Partitions on Local Disks

Running Processes

Webmin Configuration

Disk Quotas

Software Packages

PPP Usernames andPasswords

Webmin Users

Apache Webserver

Printer Administration

BIND 8 DNS Server

Sendmail Configuration

Squid Proxy Server

File Manager

Network Configuration

DHCP Server

Majordomo List Manager

Firewall Configuration

Common Modules from Webmin 0.74 Modules

slide12

Sun Solaris

NetBSD

DEC/Compaq OSF/1

Cobalt Linux

Mandrake Linux

Mandrake Linux Coprporate Server

Caldera OpenLinux eServer

BSD

IBM AIX

Redhat Linux

HP/UX

SCO UnixWare

Slackware Linux

SGI/UX

SCO OpenServer

SuSE Linux

Corel Linux

TurboLinux

MSC Linux

LinuxPPC

Xlinux

Cendio LBS Linux

Linux From Scratch

Trustix

Ute Linux

Lanthan Linux

Trustix

Cendio LBS Linux

FreeBSD

OpenBSD

Debian Linux

SGI Irix

Mac OS Server X

Delix DLD Linux

Conectiva Linux

Supported Operating Systems

Some of Webmin supported operating systems

installation of webmin1
Installation of Webmin
  • Firstly check to see if it is currently installed. Do a search for the webmin module. Webmin is included with many linux operating systems, so may appear on an installation disk.
    • Installation requires that Perl 5 is already installed (this is usually included with most versions of linux).
installation cont d
Installation (Cont’d)
  • L-M animation of finding package.
  • (you may need to wait a few seconds for the animation to start).
slide16

Installation of Webmin (Cont’d)

  • Otherwise it can be downloaded from www.webmin.com There are a couple of different versions available, choose the one which best suits your current system. Approximate file size is 3.6 to 4MB
  • If installing the RPM package run the command:

rpm -U webmin-0.87.rpm

  • If using the Solaris package run the following command: pkgadd -d webmin-0.87.pkg
  • Begins with root username and password.
installation checks
Installation Checks
  • Please wait for animation of Webmin after install.
  • Webmin is seen as a new service in the linuxconf control panel
  • Ktail messages shows that webmin starts automatically after install.
installation checks cont d
Installation Checks (Cont’d)
  • Check the following functions for Webmin:StopStartRestart
  • The "messages" log will show the status.
  • Please wait for animation.
logging on
Logging on
  • Open a web browser such as Netscape or IE, on any machine with access to the server you wish to log onto.
  • Browse to the port 10000 of the IP address or hostname. (as shown below)
logging on cont d
Logging on (Cont’d)
  • Animation of logging onto the service.
example modules

Example Modules

A brief description of some of the commonly used modules.

webmin configuration
Webmin Configuration
  • This section give the user control of the webmin setup. Allowing the adjustment to the following areas.
    • IP address control
    • Password settings
    • Interface control
    • Language used
    • Modules included
webmin configuration cont d
Webmin Configuration (Cont’d)
  • Animation of access to IP address
system modules
System modules
  • Bootup and shutdown
    • as name suggests
  • Users and Groups
    • displays all users names, id’s home directory etc.
    • allows editing of user settings
  • Manual Pages
    • extensive help pages
system modules cont d
System modules (Cont’d)
  • Cron Jobs
    • This is one process that is greatly simplified by the webmin interface.
    • Cron is a daemon that runs constantly on most unix machines. Allows for the scheduling of processes to be run at set times eg. backups or scans.
    • Lists all scheduled jobs
    • Control access of users to cron jobs
    • Add a new scheduled item
system modules cont d1
System modules (Cont’d)
  • Cron job screen sample
system modules cont d2
System modules (Cont’d)
  • Software packages
    • View all installed packages
    • Search for installed packages
    • Install new packages
system modules cont d3
System modules (Cont’d)
  • Install package screen sample
system modules cont d4
System modules (Cont’d)
  • FileSystem Management
    • It provides permission to
      • mount,
      • dismount,
      • create,
      • edit, and
      • delete 14 different filesystems
    • To get started,
      • click the Disk and Network Filesystems
    • Webmin displays a list of available filesystems
system modules cont d5
System modules (Cont’d)
  • File System Management
    • Display screen will show the
      • mount point,
      • filesystem type,
      • device or location whether it is
        • mounted, and
        • listed in /etc/fstab.
    • To edit one of the listed file system,
      • click its mount point, listed in the first column
system modules cont d6
System modules (Cont’d)
  • File System Management
    • To add or create a new filesystem,
      • first select its type from the drop-down list box
      • then click the “Add” button
    • The Create Mount and the Edit Mount screens are similar except that it has to be filled it out
    • Select the “Don't Save” button
      • to prevent an entry for the swapfile from being added to /etc/fstab
      • the swapfile will be named, imaginatively, /tmp/swapfile
    • Click the “Create” button to activate the changes
system modules cont d7
System modules (Cont’d)
  • The display screen
  • After making changes, click
    • the “Apply” button to update the /etc/fstab file
    • activate the changes.
system modules cont d8
System modules (Cont’d)
  • Running Processes
    • Webmin's process manager
      • resembles a browser-based version of the famous top utility
      • allows to execute an arbitrary command
      • screen is obtained by
        • clicking the “Running Processes” icon
    • The display is sorted either
      • by process ID or by selecting the link of
      • username,
      • memory usage, and
      • CPU time consumed
system modules cont d9
System modules (Cont’d)
  • Running Processes
    • Can be used after filling in the searching criteria
      • by clicking the corresponding search button
system modules cont d10
System modules (Cont’d)
  • Running Processes
    • Can be used to change process priority
      • click a PID from either the main listing or a search screen
      • select a new priority (called a nice level)
      • then click the “Change” button
system modules cont d11
System modules (Cont’d)
  • Running Processes
    • Common process signals with webmin