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Web Hosting - Domain Name Changes and How They Affect You
New domain names are registered all the time, and ones previously registered expired. Sometimes that's the result of simple neglect. The owner of the name chose not to renew his or her ownership, so the name became available for someone else to use. In rare cases, a highly original mind managed to think of a new one. In the other common scenarios, someone chose to just let it go or sell it.
When you choose to change your domain name, there are actually two separate steps involved: releasing the old name, and adopting the new one. But, just as the postal system can have difficulty forwarding your letters when you change your personal name, changing your domain name brings certain difficulties.
One of the most prominent is the fact that any name change requires a change to thousands of DNS Servers around the globe. DNS (Domain Name System) is the set of software/hardware components that allows domain names to map to IP addresses. IP addresses are what are actually used 'under the covers' when one computer communicates with another.
Note that there isn't always a 1:1 correspondence between a name and an IP address. One IP address can serve multiple domain names and one domain name can have multiple IP addresses. For the sake of simplicity, we'll stick to the common case here.
DNS servers around the world maintain internal databases that match the name to an IP address. Not all servers have all pairs of names/addresses. A series of complex routines allows a request to be forwarded when the particular DNS server doesn't have a needed record. When you acquire a domain name that used to be associated with a given IP address, the odds of you acquiring the same IP address are extremely low.
In the unlikely case, for example, that you acquired the domain name yahoo.com, you would almost certainly not get the IP address that was matched with it (unless you bought the Yahoo! company). So, as a result of the change, the name/IP address pair is no longer what it was.
A similar circumstance exists when you retain your IP address, but want to change the domain name associated with it. In either case, the pairing has changed.
The catch is this: when the change takes place, those DNS databases are not all updated instantaneously around the world.
Even apart from the limited speed with which computers and networks operate, (and neglecting the human factor if/when the change is made manually to more than one server) the reason is something called caching.
In order to communicate efficiently, DNS servers are designed to assume that changes will be relatively rare. Just as with the postal system, you don't move your address or change your name every minute. Since that's true, in general, the name/IP address pair is cached. A cache is a set of stored information that is reused so that fresh information doesn't have to be communicated with every request for a web page or data.
A chain of DNS servers pass requests to the last known address. There is usually more than one system between your computer and the server you want to communicate with. Most of the time, that's your current name/address. When you change the name, that pair is no longer valid. In order to propagate the new name/address pair (so the terminology goes), that cache has to be refreshed.
Something similar happens when you establish an entirely new name. That name is first associated with an IP address and that pair has to be communicated to DNS servers around the world in order for you to be able to reach any one of them at random.
But DNS servers don't do that until they are requested to do so by your action of asking for information from a remote server. Because of that, but chiefly because of caching, it can take quite a while for the new pair to become known around the Internet. Caches can expire and get refreshed in a few minutes or a few hours. It varies.
That time can be as short as an hour or less, if the path between your computer and the web server is very simple and only one DNS server needs to be updated. Or, it can take up to 48 hours or more. Though the 'official' range is often given by registrars as 24-48 hours, the average is closer to about six hours. But that's an average. The actual time in any given case can (and does) vary widely.
In the meantime, a number of effects can occur. The most obvious is that, since the name/IP address pair can't be resolved properly, you don't reach the server you want. Your browser points to the old one (in the rare case it's still accessible by that name and address), or it simply reports there's no such name at that address.
So, when registering a new name or buying an old one, you should establish the site, but not advertise it for at least a couple of days. Better to wait to get visitors than to turn them off by being 'not at home' when they call.
Prayers, Ploys and Passions: The Poetry that Gets Published (published poetry) Some people may tell you that poetry doesn’t get published. Published poetry is only that written by people who have already died. That is not true however. Poetry is not as frequently found as other kinds of writing, but it is a genre that is still alive and well in today’s publishing world. If you are a poetry writer, you are also probably a poetry reader. You of all people know that poetry publishers are still out there. There are specific types of poetry that tend to get published though. There are special interest outlets for other types, but in general, what gets published gets repeatedly published as time goes on. There are three main categories that currently published poetry falls into. Those categories encompass the most important interests of people today. Prayers and Matters of Faith The first category of published poetry involves faith. There are people that subscribe to all different kinds of faith and it is that belief that is at the core of many people’s lives. Atheists are a minority in the world. Since faith is such an important part of so many people’s understandings of the world, it is no surprise that it draws poetic words from those who believe. It started long ago. The Bible, for example, is full of poetry. Those people who first knew God were inclined to speak of him through the illustrative voice of poetry. Today people are the same way. Such is their deep experience with God that they must express their emotions with an emotional type of writing. Since so many people have personal experiences with God, those who do not write are interested in reading the writings of others. For that reason, matters of faith, and especially expressive prayers placed in poetry get published. Ploys and Plans for the Nation National interest is also of major interest to most people. As a group of people head through their lives, united with others of the same nationality, they must want to know where the group as a whole is headed. Much of the published poetry in this category contains hopes and dreams for a country’s future and expected path through history. More of the poetry in this category though is in protest of how a nation has forged its path as it has grown. Frustration with events beyond one’s control elicits words that can only have their full meaning in poetry. Since those of a nation are united with each other, poetic commentaries about that nation are of interest to everyone. They help each person express their feelings and frustrations and hopes for their home country. Passion and the Human Condition of Love People are obviously not only connected to each other as citizens of the same country. People need each other in a much more personal sense than that. A third major category of published poetry is that which contains expressions of love between people. Love poems are a genre that dates back, again, to biblical times. Romantic love has always been a popular theme within poetry because of the passion that can be displayed with poetic devices. Other kinds of love are also well expressed in verse. The love of a mother for her child or that of a friend for another friend is a common topic in poetry. Humans thrive on love. That is why poetry about love gets published. Published poetry does fall into three major categories. It appears in books and anthologies, but also in magazines and even greeting cards. As long as a poem is effective in describing a common human reaction to life, it will probably be passed along from person to person. Poetry is a beloved form of writing that connects people to one another. As long as humanity feels, poetry will continue to be published. Web Hosting - Sharing A Server – Things To Think About You can often get a substantial discount off web hosting fees by sharing a server with other sites. Or, you may have multiple sites of your own on the same system. But, just as sharing a house can have benefits and drawbacks, so too with a server. The first consideration is availability. Shared servers get re-booted more often than stand alone systems. That can happen for multiple reasons. Another site's software may produce a problem or make a change that requires a re-boot. While that's less common on Unix-based systems than on Windows, it still happens. Be prepared for more scheduled and unplanned outages when you share a server. Load is the next, and more obvious, issue. A single pickup truck can only haul so much weight. If the truck is already half-loaded with someone else's rocks, it will not haul yours as easily. Most websites are fairly static. A reader hits a page, then spends some time skimming it before loading another. During that time, the server has capacity to satisfy other requests without affecting you. All the shared resources - CPU, memory, disks, network and other components - can easily handle multiple users (up to a point). But all servers have inherent capacity limitations. The component that processes software instructions (the CPU) can only do so much. Most large servers will have more than one (some as many as 16), but there are still limits to what they can do. The more requests they receive, the busier they are. At a certain point, your software request (such as accessing a website page) has to wait a bit. Memory on a server functions in a similar way. It's a shared resource on the server and there is only so much of it. As it gets used up, the system lets one process use some, then another, in turn. But sharing that resource causes delays. The more requests there are, the longer the delays. You may experience that as waiting for a page to appear in the browser or a file to download. Bottlenecks can appear in other places outside, but connected to, the server itself. Network components get shared among multiple users along with everything else. And, as with those others, the more requests there are (and the longer they tie them up) the longer the delays you notice. The only way to get an objective look at whether a server and the connected network have enough capacity is to measure and test. All systems are capable of reporting how much of what is being used. Most can compile that information into some form of statistical report. Reviewing that data allows for a rational assessment of how much capacity is being used and how much is still available. It also allows a knowledgeable person to make projections of how much more sharing is possible with what level of impact. Request that information and, if necessary, get help in interpreting it. Then you can make a cost-benefit decision based on fact. |