Linux webmin


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Linux webmin

  1. 1. Introduction
  2. 2. System Administration With Webmin A brief overview of new era administration tool Prepared by Henry Batula 12539114 Ni Xiao 12640223 Peter Greenup 12645736
  3. 3. 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 3
  4. 4. 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 4
  5. 5. 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 5
  6. 6. 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. 6
  7. 7. 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. 7
  8. 8. Sections within Webmin  The individual modules of webim are found in 5 different sections. • • • • • • Webmin System Servers Networking Hardware and Others 8
  9. 9. Interface of Webmin 9
  10. 10. 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 10
  11. 11. Common Modules from Webmin 0.74 Modules admi Scheduled Cron Jobs n NFS Exports BIND 4 DNS Server Internet Services and Protocols Bootup and Shutdown Actions Samba Windows File Sharing Disk and Network Filesystems Users, Groups and Passwords Partitions on Local Disks Running Processes Webmin Configuration Disk Quotas Software Packages Webmin Users PPP Usernames and Passwords Apache Webserver Printer Administration BIND 8 DNS Server Sendmail Configuration Squid Proxy Server File Manager Network Configuration DHCP Server Majordomo List Manager Firewall Configuration 11
  12. 12. Supported Operating Systems 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 12 Some of Webmin supported operating systems
  13. 13. Installation of Webmin
  14. 14. 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). 14
  15. 15. Installation (Cont’d)  L-M animation of finding package.  (you may need to wait a few seconds for the animation to start). 15
  16. 16. Installation of Webmin (Cont’d)  Otherwise it can be downloaded from 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. 16
  17. 17. 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. 17
  18. 18. Installation Checks (Cont’d)  Check the following functions for Webmin: Stop Start Restart  The "messages" log will show the status. Please wait for animation.  18
  19. 19. 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) 19
  20. 20. Logging on (Cont’d)  Animation of logging onto the service. 20
  21. 21. Example Modules A brief description of some of the commonly used modules.
  22. 22. Webmin main tab 22
  23. 23. 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 23
  24. 24. Webmin Configuration (Cont’d)  Animation of access to IP address 24
  25. 25. System Tab 25
  26. 26. 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 26
  27. 27. 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 27
  28. 28. System modules (Cont’d)  Cron job screen sample 28
  29. 29. System modules (Cont’d)  Software packages    View all installed packages Search for installed packages Install new packages 29
  30. 30. System modules (Cont’d)  30 Install package screen sample
  31. 31. 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 31
  32. 32. 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 32
  33. 33. 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 33
  34. 34. System modules (Cont’d)   The display screen After making changes, click • • the “Apply” button to update the /etc/fstab file activate the changes. 34
  35. 35. 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 35
  36. 36. System modules (Cont’d)  Running  Processes Can be used after filling in the searching criteria • by clicking the corresponding search button Criteria Description Owned by Enter a user name Matching Enter a string Usage % CPU Enter between 0 and 100 Using filesystem Select a filesystem Using file Enter a filename 36
  37. 37. 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 37
  38. 38. System modules (Cont’d)  Running  Processes Common process signals with webmin Signal Description INT Sends a keyboard interrupt (Ctrl+C) QUIT Terminates the process. ABRT Terminates the process and creates a memory dump KILL Terminates the process TERM Terminates the process STOP Stops the process, but does not kill it CONT Resumes a stopped process 38