Category Archives: Technology
Over the years, DNS Failover has become a very popular service primarily due to the fact that it is relatively inexpensive and fairly easy to deploy and manage. But is it the right solution for your organization? In this article, we’ll outline what DNS failover is and provide an overview of the benefits and appropriate uses for this type of technology.
What is DNS Failover?
First, we must define what DNS failover is before trying to understand whether or not it offers benefits. Simply put, DNS failover is an add-on feature of a DNS Service and is a system that consists of two main components. The first component monitors servers or devices behind IP addresses in an effort to determine their state, e.g. up or down. Second, it uses the server state information to automatically update the IP address associated with a particular DNS record, such as an ‘A’ record, ‘AAAA’ record or otherwise. It may consist of other components designed to deliver email or SMS alerts in the event that an outage is detected or changes are made, but any successful DNS Failover solution must consist of at least the first two essential elements.
Common Applications for DNS Failover
So now that we know what DNS Failover is, what is the most common use for it and what applications can benefit from this method of automating DNS updates?
Perhaps the most obvious use that comes to mind is to control web traffic. Failing over between redundant web servers is a very common implementation, and is probably the most frequently used application. From the failover system’s perspective, it really doesn’t matter where the two IP addresses are, so long as they are different. So because of this, it could be used to failover between two different servers at the same datacenter, servers at different datacenters (even across the globe) or it could be even the same server with two different network connections, each having their own IP address, for example a server at a corporate office with one IP on each of two different T1 lines.
Naturally, what can be done for web servers can also be done for mail servers, FTP servers, streaming media servers or VoIP servers, just to name a few. Essentially, if it has an IP address and can be monitored externally, DNS Failover can route traffic to it when it is up, and redirect to another server when it is down.
Most well thought out DNS Failover implementations should have at least a few basic features. First, and probably paramount to failover success, is monitoring. The more advanced the monitoring feature-set, the better. This allows you to detect outages as accurately as possible. At a minimum, we would expect functionality to fine-tune the monitors and to run them from multiple geographic locations in order to create an accurate picture for when failover actually needs to occur. Of course, it should probably go without saying that the monitoring and alerting functionality should be able to send alerts via email, SMS or both.
Another important feature, in our opinion, is some flexibility in how traffic is routed. The most common traffic routing configurations are sequential or round-robin. Sequential allows you to list servers in the order you want traffic to be delivered so that if the server with a priority of 1 goes down, it sends traffic to the server with a priority of 2 and so forth. Round-robin publishes a DNS record for every one of the active and available servers so that traffic is distributed amongst them as evenly as possible. When one goes down or becomes otherwise unavailable, it is simply removed from the pool allowing traffic to continue being distributed amongst the remaining server(s).
And finally, you’ll probably want a feature that prevents the automatic re-announcement of a server’s IP address when it comes back online. In the case of a server providing static web content, re-adding may not pose a problem, but in the case of a database server requiring resynchronization, this little feature is critical.
Limitations of DNS Failover
The biggest limitation when using DNS Failover for application switching is the ability to quickly detect an outage and make a change that will actually propagate the Internet in relatively short order to seamlessly redirect users, both current and future. Even the best DNS Failover solutions that accurately detect an outage and update DNS quickly and accurately still leave customers at the mercy of a well known problem called caching. This is an extremely tough issue to resolve because it is not within the DNS Failover service providers control.
Caching issues are created when ISPs ignore TTL values, or they can be caused by something as simple as default Internet browser settings which are configured to cache images in order to improve page load times. The shortest compliant TTL value is 60 seconds, and for some ISPs this is simply too short. AOL, for example, is known to ignore low TTL values and substitute them with something much higher, say 15 minutes, for example. But other than those ISPs who ignore TTL values, a 60 second setting in theory *should* propagate the Internet relatively quickly.
Is there anything better?
Depending on your application, Cloud Load Balancing might be a better fit. That, of course, should be dictated by your specific requirements for uptime, flexibility for balancing traffic among servers and how critical the need to avoid caching created by TTL avoidance or just plain old browser settings. Cloud Load Balancing is similar in design, but offers extremely powerful traffic management solutions similar to hardware load balancers (except on a global scale) for serious online organizations.
Repairing your cracked damaged lcd screen display on Samsung Galaxy S6 or S6 Edge G920F G925F using original genuine products
Phones these days get bigger and bigger, more complex and often easier to break. If you drop your phone there is always a chance of breaking your lcd screen display. The ideal solution is not to crack your display by dropping your phone but of course it can happen sometimes unfortunately. If you have the misfortune of breaking your screen then many people assume it will be an incredibly expensive job to repair your phone with an authorised Samsung authentic screen. This is simply not the case if you do a DIY do it yourself repair. Is this possible for the average joe is a very often asked question.. The answer in general is yes. There are many youtube videos and disassembly instructions to help you in the repair. It’s a simple case of unscrewing your phone and swapping over everything.
Why, you may be thinking is it important to use an original authentic display and not some Chinese copy digitizer touch screen? The answer is very simple, Chinese displays are of a poor quality which often breaks after a small period of time as they use previously damaged and repaired parts. What’s more they don’t have gorilla glass on the front of the display so they break incredibly easy and you end up paying double in the end. The answer is to buy an original display and get your phone fixed back to the factory standard as new. Black mist, blue dark grey, white or black edition makes no difference, all the displays are the same when sourced from Samsung.
Now you understand what you need and why, you are probably wondering where can you buy your new Samsung Galaxy S6 SM-G920F or Galaxy S6 Edge SM-G925F S6 Lcd Screen Display original genuine Samsung lcd screen display from at a cheap good price whilst making sure that you really are buying an authentic supplied by Samsung UK product? Well with 14 years of supplying genuine original displays your honest supplier of choice could be here: Original Genuine Galaxy S6 Display who buy directly from Samsung. Good luck with your repair, buy original and save money with the cheapest repair getting it done properly the 1st time.
The Easiest Way to Get your Love Psychic Reading is to Go Online
Who else is curious in knowing their love psychic reading? Are you struggling in knowing if your partner is your soulmate? Are you sure you are in a relationship with the “one”? Are you in love with your current partner? Having no luck in love and already getting desperate? Do you want to learn the truth about your love life from a love psychic?
Here is what i’ve learned after researching, writing and reading about love psychics.
Each person is entitled to have and find his or her better half. A soul mate is a person ideally suited to another as a close friend or romantic partner. Superstitious people are usually those who consult psychics. Most of the people who consult in psychics because they get inspired and hope for the best in their life and they could obtain wisdom regarding their life. The most asked topic is love.The definition of love is it is an intense feeling of deep affection. When you consult a sincere psychic reader, it could seriously help you unravel a lot of things about your love life.
Why do i advice people to look for love psychics online?
Finding a psychic that specializes in love online will actually depend on your option and your budget. I tried consulting to love psychics in malls however they are not accurate enough. There are a lot of websites that offer accurate psychic readings. When you find a psychic on the internet, you need to make it a point to check if he or she has an official website. When you check the website of the psychic it is important that you read the testimonials of the previous customers. Checking and reading the testimonials is a big help because you could find out if the psychic is genuine or not. Finding the best love psychic website online will actually help you in getting accurate and indisputable love readings. You need to be clever in choosing your love psychic so would not be scammed. Knowing what your readings mean will actually save you from wasting your money. You can get love psychic readings on when you will find your soul mate, who will your soul mate be, what is going wrong in your current relationship, how you can correct it, it your current mate the right one for you, or how to find the right one.
The best psychic that you could actually find is “YOU” since people actually learn from their mistakes and experiences so that means it would not be hard for a person to find the love of his life.
More ideas: read the full info here
Extra Services That You Should Look for When Buying Compressed Reconditioned Gas Cylinder Cabinets
You can easily find a lot of great suppliers for compressed reconditioned gas cylinder cabinets these days. If there is one thing you should understand though, it is that these suppliers can offer you a varied range of value in terms of the services they provide. With that in mind, here are several extra services that you can try to look for from these suppliers to ensure that you get better value for your purchases.
Safety checks and quick installation services are definitely great additional services that can further boost the value you receive for your purchase of any gas cabinets. Since it is a good way to be sure that you are placing your gas cylinder in a safe location, the proper safety checks are very important. When not properly installed, your gas cabinet can pose some security risks at home, and that’s why you need someone that is highly knowledgeable about such a task.
Next, as far as suppliers for gas cabinet products goes, a very important added service that you should really look for would be excellent product warranties. Purchasing a product that has factory defects isn’t uncommon, and it can be a nightmare to have that one replaced if it doesn’t come with a good product warranty. Most important of all, you can assume that a company is very confident about the quality of its product, once they put an excellent warranty behind it.
Last but not the least, as far as these added services from your gas cabinet supplier is concerned, choosing one that can also provide you with modification services, is definitely a good idea. This is simply because the majority of home owners these days, may have special modification needs for their gas cabinets, and having a supplier that can provide that, makes things more convenient for them. In addition to having your gas cabinet installed perfectly, you would also no longer need to look for another individual just for the modification alone.
Do keep the few pieces of advice above in mind in case you have plans of finding a supplier that can provide you with compressed reconditioned gas cylinder cabinets. Although you can do without most of these additional services, they shouldn’t be ignored and that’s because they can definitely add more value to the investments that you make. If you have to, take your time when looking for a supplier, and that’s so you can be sure you pick the best one in the market today.
Get Into Tech News and Learn New Things
Many fans of new technology developments are always searching for better sites than what they have read already. To get the best up-to-date information of what are the new technologies in the market, you use a checklist to set the criteria. Let us briefly discuss a few of these source of information. Others are already on your list, while some may be new to you. You will find a good source of information as well as you are introduced to many new technologies, and this is the more important thing.
It is the website that presents stories about the big companies that provide the best information of new technologies. The bigger companies, not the new ones, are the sources of what are new that tech fans would follow. In other words, you can be assured that the companies you are following through these websites are experts in the field and know what they are talking about.
The other side of technology news is that several new businesses are also good to be promoted aside from the big companies. Ideally, websites are to create a balance between these two. By looking at what are new out there, is a way to learn new things of your own. To promote create environment between developers and the rest of the tech community, discussions are encouraged.
A large number of bloggers and surfers follow websites that feature reliable news about what’s new in technology, and these tech fans can also offer ideas and suggestions about the subject. This scenario can create an innovative discussions that would be helpful to improve and contribute new technologies. It is good to be a part of a website that promotes discussions both ways. This communications can be done through a message board or a blog where all users can post their ideas. Changing the way on how we communicate are the different social networking sites now available, and these pave the way for websites to make their information more interesting for users to stay reading.
Every high tech fan would always dream of accessing the latest software demo of any new release. Allowing high tech fans to make a preview of new developments will give a website an edge of its viewing numbers. Having tie ups with the concerned companies will make the websites’ users respect intellectual rights and copyright rules.
You sometimes experience an information overload because of the many information online. The latest technology would be known regularly through blog, and this is what you would have to do to get the updates of new technology. You can trust the information published in the blogs, and these are credible sources of information. It is known that the number of bloggers are increasing because of the reliability and advanced information they give.