CentOS

Supporting over 70 collations, more than 30 character sets, multiple storage engines, and deployment in virtualized environment, MySQL is a mission-critical database server that is used by production servers all over the world. It is capable of hosting a vast number of individual databases and it can provide support for various roles across your entire network. MySQL server has become synonymous with the World Wide Web (WWW), is used by desktop software, extends local services, and is one of the world’s most popular relational database systems.

To guarantee high-availability in your network, it can be useful to operate more than one DNS server in your environment to catch up with any server failures. This is particularly true if you run a public DNS server where continuous access to the service is crucial and where it is not uncommon to have five and more DNS servers at once. Since configuring and managing multiple DNS servers can be time-consuming, the BIND DNS server uses the feature of transferring zone files between the nodes so that every DNS server has the same domain resolving and configuration information.

In this process, we will show you how you can quickly add new local domain record entries to your authoritative BIND server which are currently unknown to your nameserver.

So far in this chapter division, we used Unbound as a caching-only DNS server solution because it is very secure and fast, and BIND as our authoritative-only DNS server because its zone management is highly configurable and customizable. BIND has been around for a long time and is the most used DNS software ever. However, a number of critical bugs have been found (and luckily fixed) in the past.

Every network communication between computers can only be made through the use of unique IP addresses to identify the exact endpoints of the communication. For the human brain, numbers are always harder to remember and work with than assigning names to things. Therefore, IT pioneers started in the early 70s to invent systems for translating names to physical network addresses using files and later simple databases. In modern computer networks and on the Internet, the relationship between the name of a computer and an IP address is defined in the Domain Name System (DNS) database.

Analyzing log files is the most important technique for troubleshooting all kinds of problems or improving services on Linux. In this process, you will learn how to configure and enable vsftpd’s extensive logging features in order to help system administrators when problems arise, or simply to monitor usage with this service.

In this process, you will learn how to customize your vsftpd installation. vsftpd has a lot of configuration parameters, and here we will show how to create a custom welcome banner, change the server’s default-time out, limit user connections, and ban users from the service.

In this process, you will learn how to implement virtual users in order to break away from the restriction of using local system user accounts. During the lifetime of your server, there may be occasions when you wish to enable FTP authentication for a user that does not have a local system account. You may also want to consider implementing a solution that allows a particular individual to maintain more than one account in order to allow access to different locations on your server. This type of configuration implies a certain degree of flexibility afforded by the use of virtual users.