SEEM3490 Information Systems Management Lecture 03 – Managing Information System III Email Server

! For sending emails, three important terminologies: ! Blacklist ! Whitelist ! Graylist

! Two good links: ! http://www.senderbase.org/ ! http://mxtoolbox.com/blacklists.aspx

! Common reasons that an email cannot reach the client: ! Email server contains a virus and has been sending out spam. ! Email server may be misconfigured. ! You are using a dynamic IP address and the address was previously utilized by a known spammer. ! Your users in your network are sending out build emails. ! The definition of bulk is subjective

! Setting up email server is not difficult. ! A common and well known one is Postfix ! http://www.postfix.org/ ! Mac OS X already shipped with an email server. What you need to do is to enable it!

! Usually, a web server is setup in a remote location in a data center

! Question: ! How to upload files to a web server? ! E.g. how to upload html documents and images?

! A common and easy solution: ! Set up a file server together with the web server in the same computer.

! A file server: ! Designed primarily to enable the rapid storage and retrieval of files (such as documents, sound files, photographs, movies, images, databases, etc.)

! Does not perform any calculations

! Does not run any programs on behalf of the clients.

! Note: ! By default, a web server uses port 80 for communication. ! By default, a file server uses port 25 for communication.

! There are many products that will make you computer to become a file server ! Search them by yourself!

! One of the most popular products is called FileZilla: ! https://filezilla-project.org/ ! Unfortunately, it only supports Windows…

! Another common one for Mac and Linux is Pureftpd ! http://jeanmatthieu.free.fr/pureftpd/

! The latest version of Mac OS X does not ship along with any FTP server…

! Fortunately, it has SFTP (secure-FTP) ! To setup: ! http://www.maclife.com/article/howtos/ how_make_your_mac_sftp_server

! Use a software with GUI: ! FileZilla Client ! Transmit

! Via command prompt: ! Open a terminal, type: ! E.g., ftp 127.0.0.1

! Many database servers exists. One of the most common one is definitely MySQL ! MySQL is currently owned by Oracle Corporation ! MySQL compiles on a number of platforms ! MySQL is free to download and use

! MySQL is named after a co-founder Michael Widenius's daughter ! Michael has a daughter called My (so MySQL is developed) and a son Max (so maxDB is developed)

Michael Widenius My Widenius

! Simply go to the official website, download and install it! ! http://www.mysql.com

! Like most DBMS, MySQL it does not have any GUI

! To visualize the database and help you to do managements, you may need GUI. Many tools can help you to do. One of the most useful and handly one is phpMyAdmin: ! http://www.phpmyadmin.com ! A free and open source tool written in PHP intended to handle the administration of MySQL with the use of a web browser.

! Have you ever heard about the "Year 2000 Problem"? ! Also known as "Y2K Bug", "Millennium Bug"

! Similarly, in MySQL and some other DBMS: ! For the data type "Year", ! If you set it to handle 2-digits, you can input year from 1970 – 2069 ! Year 2070 Problem! ! If you set it to handle 4-digits, you can input year from 1901 – 2155 ! Year 2156 Problem!

! The original Unix timestamp datatype stores a date and time as a signed 32-bit integer representing the number of seconds since 1 January 1970.

! During and after 2038, this number will exceed 231 1, the largest number representable by a signed 32-bit integer, causing the Year 2038 problem. ! The Unix Millennium bug or Y2K38. ! To solve this problem, many systems and languages have switched to a 64-bit timestamp or supplied 64-bit alternatives.

! A year is a leap year if: ! Divisible by four, and ! If it is divisible by 100, then it must also be divisible by 400 (Gregorian Calendar/Western Calendar/Christian Calendar). ! E.g., 1600 was a leap year, but 1700, 1800 and 1900 were not.

! Some programs may have relied on the oversimplified rule that a year divisible by four is a leap year. ! 2000 is a leap year but 2100 is not a leap year. ! Many programs contained incorrect leap year logic, assuming for instance that no year divisible by 100 could be a leap year.

! Up to now, you have learned: ! Web Server ! FTP Server ! Email Server ! DB Server

! All of them are crucial in the field of information systems management in nowadays Internet world. ! Managing them is usually regarded as "managing web hosting"

! There are some nice tools to help us manage web hosting, so that we do not need to install the components one by one by ourselves. ! XAMPP http://www.apachefriends.org/en/xampp.html ! AMPPS http://www.ampps.com/ ! MAMP http://www.mamp.info/ ! …

! If we need to manage multiple websites, those hosting solutions in the previous page may not be enough.

! Software such as "Web Hosting Control Panel" thus appears. ! It is usually a web-based GUI that allows customers to manage various hosted services in a single place. ! A good introductory point: http://en.wikipedia.org/wiki/ Comparison_of_web_hosting_control_panels

! One of the most common ones is cPanel (http://cpanel.net/)

! Some free ones are ISPConfig (http://www.ispconfig.org/) and webmin (http://www.webmin.com/)