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Users access your news server using newsreaders You can place controls on users with options in the readersconf file Control is specified in two components: authentication and access definitions The authentication definition creates a user category and the hosts and their authentication tools for users The access definition applies restrictions to a user category, such as what newsgroups can be accessed and whether posting articles is allowed
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INN also supports overviews These are summaries of articles that readers can check, instead of having to download the entire article to see what it is Overviews have their own storage
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methods: tradindexed, buffindexed, and ovdb You specify the one you want to use in the ovmethod feature in innconf tradindexed is fast for readers but difficult for the server to generate buffindexed is fast for news servers but slow for readers ovdb uses Berkeley DB database files and is very fast for both but uses more disk space If you choose ovdb, you can set configuration parameters for it in ovdbconf
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On many distributions, a news user is already created with a newsgroup for use by your INN daemon and sets up the news directories in /var/spool/news INN software also installs cron scripts, which are used to update your news server, removing old articles and fetching new ones These are usually placed in the /etc/crondaily directory, though they may reside anywhere inn-cron-expire removes old articles, and inn-cron-rnews retrieves new ones inn-cron-nntpsend sends articles posted from your system to other news servers INN also includes several support programs to provide maintenance and crash recovery and to perform statistical analysis on server performance and usage cleanfeed implements spam protection, and innreport generates INN reports based on logs INN also features a very strong filter system for screening unwanted articles
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NOTE Leafnode is an NNTP news server designed for small networks that may have slow
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connections to the Internet You can obtain the Leafnode software package along with documentation from its website at leafnodeorg Along with the Leafnode NNTP server, the software package includes several utilities such as Fetchnews, Texpire, and Newsq that send, delete, and display news articles slrnpull is a simple single-user version of Leafnode that can be used only with the slrn newsreader
Database Servers: MySQL and PostgreSQL
Two fully functional database servers are included with most Linux distributions, MySQL and PostgreSQL MySQL is by far the more popular of the two, though PostgreSQL is noted for providing more features Recently, the MySQL AB project added MaxDB, formerly SAP DB, which provides capabilities comparable to many professional-level database management systems This chapter will cover how to set up and manage a MySQL database and will offer a brief introduction to PostgreSQL You can learn more about these products through the sites listed in Table 26-6
Database MySQL PostgreSQL MaxDB TABLE 26-6 Database Resources
Resource mysqlcom postgresqlorg mysqlcom
Part VI:
Internet and Network Services
Relational Database Structure
MySQL and PostgreSQL both use a relational database structure Essentially, this means data is placed in tables, with identifier fields used to relate the data to entries in other tables Each row in the table is a record, each with a unique identifier, like a record number The connections between records in different tables are implemented by special tables that associate the unique identifiers from records in one table with those of another Relational database theory and implementation are subjects beyond the scope of this chapter A simple, single-table database has no need for a unique identifier A simple address book listing names and addresses is an example of a single-table database However, most databases access complex information of different types, related in various ways Instead of having large records with repeated information, you divide the data in different tables, each holding the unique instance of the data This way, data is not repeated; you have only one table that holds a single record for a person s name, rather than repeating that person s name each time the data references him or her The relational organization then takes on the task of relating one piece of data to another This way, you can store a great deal of information using relatively small database files Though there are many ways to implement a relational database, a simple rule of thumb is to organize data into tables where you have a unique instance of each item of data Each record is given a unique identifier, usually a number To associate the records in one table with another, you create tables that associate their identifiers
The SQL query language is the language used by most relational database management systems (RDBMSs), including both MySQL and PostgreSQL Though many RDBMSs use administrative tools to manage databases, on Linux MySQL and PostgreSQL, you still have to use the SQL commands directly Common SQL commands that you may use are listed in Table 26-7 The commands are often written in uppercase by convention, though they can be in lowercase
Command CREATE DATABASE name CREATE TABLE name (fields, ) INSERT INTO table-name VALUES (value list) INSERT INTO table-name VALUES (value list), (value list), SELECT field FROM table-name WHERE value USE database
Description Creates a database Creates a table within a database, specifying fields Creates and inserts a record into a table Inserts multiple records at once Search operation, selects certain records in a table based on a value in a specified field Uses a particular database; following commands will operate on it
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