Although WordPress can work in almost any environment, even very minimal ones, it must be acknowledged that it does not work completely well in these. That's why here we are going to make some minimum recommendations of the environment in which it would work most effectively. The web server is the software dedicated to run the files of the website and where users come to consult them, mainly through the Web. There are many web servers and, generally, any that support the execution of PHP files should be able to work with WordPress.
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DNS is one of those simple facts of life that bears worrying about. It's absolutely, completely, totally indispensable and very easy to maintain, yet it can render entire datacenters completely irrelevant when it breaks or becomes unavailable -- which is why you probably shouldn't be running your own external DNS. Most companies have an external presence that's run from a colocation facility or Web hosting shop. Others will host their own Web site at their own location but probably shouldn't. Either way, running full master DNS on your own servers isn't a great idea. What's the solution?
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A slave DNS domain is one for which your system acts as a backup for the master server. They are used to spread the load of serving DNS , and to allow clients to still resolve names in the domain if the master is temporarily down or un-reachable. Records are transferred from the master to slaves periodically, or when they change. Typically, when a virtual server is created using Virtualmin a master DNS domain is created on the same system. However, in some cases the master domain may be hosted on a different system, such as one run by the client who owns the domain. In this case, the Slave DNS plugin can be used to easily create and manage a local backup for the domain, to increase reliability or to satisfy registrar requirements on the number of nameservers a zone needs. Unless some error message about plugin or feature dependencies appears, it is now almost ready for use.