seem3490 information systems managementseem3490/slides/lecture04.pptx.pdflike most dbms, mysql it...

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

Copyright (c) 2012. Gabriel Fung. All rights reserved.

Email Server (cont'd)

!   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


Email Server (cont'd)

!   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!


File Server

!   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.


File Server (cont'd)

!   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.


FileZilla

!   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/


Mac SFTP

!   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


To Connect to a FTP Server

!   Use a software with GUI: ! FileZilla Client

!   Transmit

!   Via command prompt: !   Open a terminal, type:

!   E.g., ftp 127.0.0.1


Database Server

!   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


Database Server (cont'd)


MySQL

!   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)


My Widenius Michael Widenius

MySQL Setup

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


Accessing MySQL

!   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.


Some "Bugs" Related to Database

!   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!


Year 2038 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.


Leap Year Problem

!   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.


Short Review

!   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"


Hosting Solutions

!   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/

!   …


Web Hosting Control Panels

!   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


Web Hosting Control Panels (cont'd)

!   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/)


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