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 xinetd, the eXtended InterNET Daemon, is an open-source daemon which runs on many Linux and Unix systems and manages Internet-based connectivity. It offers a more secure extension to or version of inetd, the Internet daemon. xinetd performs the same function as inetd: it starts programs that provide Internet services. Instead of having such servers started [...]
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Many network enabled Linux applications don’t rely on themselves to provide restricted access or bind to a particular TCP port; instead they often offload a lot of this work to a program suite made just for this purpose, xinetd. The xinetd RPM is installed by default in Fedora Linux and uses /etc/xinetd.conf as its main [...]
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When each quota-enabled file system is remounted, the system is now capable of working with disk quotas. However, the file system itself is not yet ready to support quotas. To do this, you must first run quotacheck. The quotacheck command examines quota-enabled file systems, building a table of the current disk usage for each one. This table is [...]
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This tutorial walks you through implementing disk quotas for both users and groups on Linux, using a virtual filesystem, which is a filesystem created from a disk file. Since quotas work on a per-filesystem basis, this is a way to implement quotas on a sub-section, or even multiple subsections of your drive, without reformatting. This [...]
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Successfully networking your Ubuntu system with Windows clients involves providing and integrating with services common to Windows environments. Such services assist the sharing of data and information about the computers and users involved in the network, and may be classified under three major categories of functionality: File and Printer Sharing Services. Using the Server Message [...]
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You can view all the data contained in the table named test by using the select command. In this example you want to see all the data contained in the very first row in the table. mysql> select * from test limit 1; With a brand new database this will give a blank listing, but [...]
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The describe command gives you a list of all the data fields used in your database table. In the example, you can see that the table named test in the salesdata database keeps track of four fields: name, description, num, and date_modified. mysql> describe test; +—————+————–+——+—–+————+—————-+ | Field | Type | Null | Key | [...]
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The show tables command gives you a list of all the tables in your MySQL database, but you have to use the use command first to tell MySQL to which database it should apply the show tables command. The example uses the salesdata database; notice that it has a table named test. mysql> use salesdata; [...]
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A number of commands can provide information about your newly created database. Here are some examples: Login As The Database User: It is best to do all your database testing as the MySQL user you want the application to eventually use. This will make your testing mimic the actions of the application and results in [...]
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Another common feature of prepackaged applications written in MySQL is that they may require you to not only create the database, but also to create the tables of data inside them as part of the setup procedure. Fortunately, many of these applications come with scripts you can use to create the data tables automatically. Usually [...]
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On many occasions you will not only have to create a database, but also have to create a MySQL username and password with privileges to access the database. It is not a good idea to use the root account to do this because of its universal privileges. MySQL stores all its username and password data [...]
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MySQL has its own command line interpreter (CLI). You need to know how to access it to do very basic administration. You can access the MySQL CLI using the mysql command followed by the -u option for the username and -p, which tells MySQL to prompt for a password. Here user root gains access: [root@bigboy [...]
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Short for Media Access Control address, a hardware address that uniquely identifies each node of a network. In IEEE 802 networks, the Data Link Control (DLC) layer of the OSI Reference Model is divided into two sublayers: the Logical Link Control (LLC) layer and the Media Access Control (MAC) layer. The MAC layer interfaces directly [...]
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It is a recommended practice to backup the configuration of the PIX Firewall for use in emergencies or for disaster recovery. But, the PIX does not support an external Flash card. The internal Flash does not support the backup of the configuration file. The configuration file must be saved externally The PIX configuration file can [...]
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SafeSquid has an option in ‘Network Settings’, to add new interface for outgoing connection.This is useful in networks where you need to split the load between different ISPs. It can also be useful to switch different ISPs due to slow net connection or discontinuity.This can be accomplished by following way: You wish to – 1. [...]
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