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Because a database such as MySQL is typically managed by a database administrator (Linux admins generally don t care about databases), MySQL has its own root user. Before you can do anything with MySQL, however, you must set a password for this user, and you ll do this with the mysqladmin command: mysqladmin -u root password secret Now at least you can do something with your MySQL server. By the way, it s not a very secure idea to type the root password for your database server in clear text on the command line like this. You can also use the option -p to have mysqladmin prompt for a password: mysqladmin -u root -p password Next, your server will ask for you to input a password twice.

You learned earlier in this chapter that BasicEffect is a class XNA provides to help you create effects for rendering 3D scenes BasicEffect includes many properties that let you define the camera position, the projection to be used, and the light sources used, for example The next code sample shows the complete code for the LoadContent method, including creation and configuration for a simple basic effect, which will suffice for the examples in this chapter All of the functions and properties used in this code were explained earlier in this chapter; so this might be a good time for you to refer back to the discussions of the projection types and the view and projection matrices.

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Another task that a Linux administrator has to occasionally perform is to create a database. You will sometimes install applications that want to use a MySQL database, and you need to create that database first to use such applications. To do this, use the mysqladmin command again. In the following example, you ll create a database with the name DBASE1: mysqladmin -p create DBASE1sudo Normally, this is where your responsibilities as a Linux administrator end. The rest of the work on MySQL involves creating tables and populating the database with data, which is typical work for the database administrator, so it is not covered here.

XML solves the problem of data representation and exchange. However, often we need to convert this XML data into a format understood by the target application. For example, if your target client application is a web browser, the XML data must be converted to HTML before display in the browser.

If your Internet connection is not so fast, you can benefit from using a proxy such as Squid. How does it work The end user connects to the proxy, and the proxy fetches the requested information from the Internet. Using a proxy has two major benefits. First, it speeds things up. After the information is in the cache of the proxy server, the next user doesn t have to go fetch it somewhere far from the Internet. So there s a speed benefit. There s also a security advantage. If the proxy server is the only way to connect to the Internet, you can set up authentication on the proxy, thus allowing only authorized users to access the Internet. Another security benefit is that you can work with ACLs to define which Internet sites are allowed and which are not. You ll learn more about Squid ACLs later in this chapter in the section Configuring Squid Access Control List Policies. When using a proxy, there is something to be aware of, however. A proxy works for the upper layers in the TCP/IP stack because typically it is application level oriented. That means that some protocols are supported, whereas others are not. The most important protocols that are handled by Squid are HTTP and FTP. DNS requests can also be cached in the Squid proxy cache.

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