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.
Online Love Psychics: A trouble Free and Fast Way to Get Your Love Psychic Readings
Do you also want to get a love psychic reading? Having a hard time in knowing if you already have your other half? Are you in a relationship with your other half? Are you in love right now? Having no luck in love and already getting desperate? Are you ready to consult a psychic and know the truth about your love life.
Here are some of the things that I’ve learned for 20 years of researching, writing and reading about love psychics.
We each have a destined soul mate. A soul mate is a person ideally suited to another as a close friend or romantic partner. People who are very superstitious are the ones who usually consult a psychic. 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 common topic that people consult psychics is love.Love is caring for someone you love and being with him when he needs your help, doing everything to protect and look after him. 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?
One reason is that it would depend on your budget and your options as well. In my experience most psychic that are in malls wont give you an accurate reading. You could find a lot of psychics that specializes in love online that will actually provide accurate readings. The moment you find a love psychic you must check if the psychic has hes own website. Here you will get to read the testimonials posted by their previous customers. This could help you in determining if the psychic is real or fake. If you want to get accurate and indisputable psychic love readings you need to look for the best website online. You need to be smart to separate the genuine psychics from the fraudulent psychics. You need to know what the reading mean so that you are not cheated of 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.
However, the best psychic is always the person you see in the mirror, because a person learns from experience, so it shouldn’t be difficult for you to find love.
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. That said, below are some extra services from these suppliers that you should look into, and that’s because they can add more value to the purchase you are planning to make.
When it comes to adding more value to the purchase that you make, choosing a supplier that can offer additional services such as safety checks and fast installation is definitely a good idea. Safety checks for one; are necessary because it is a good way to ensure that the area where you want to place your gas cylinder is actually safe. For one, if your cabinets aren’t installed properly, there is a chance that is will pose security risks for your home in the near future, and that’s why it’s crucial to have someone knowledgeable about the task handle it for you.
Excellent product warranties are definitely the most important added services that you should look for when it comes to your supplier of gas cabinets. Getting a product that has factory defects isn’t that rare at all, and that’s why having a good product warranty is important since it can make replacing the product you have purchased, an easier task to accomplish. 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. Things can be more convenient for home owners these days that are in need of special modifications for their cabinets if their very supplier is able to cater to such needs. With this, you will no longer have to be forced to hire another service provider to take care of the modification and you can also be sure that your cabinet is installed properly.
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.
Source: gas scrubber cabinet
Get Into Tech News and Learn New Things
Several viewers of websites are on a constant look out for new technology to compare what they are presently reading. The latest news in gadgets and gaming can be obtain through a list of criteria as a source of information. There are a few of these sources to aid you. Others are already on your list, while some may be new to you. This list is useful and will help you in looking for the right source of the technology you are looking for, and most importantly, it will lead you to new discoveries of what technologies are newly developed out there.
Big companies that are featured in websites are providing the best information about new technologies. There are several new businesses in technology nowadays, but it is the top companies that are leading in the business that people who are into gadgets are following. You would know that the websites you are reading are knowledgeable in the business since they are following these front runner companies.
The other side of technology news is that several new businesses are also good to be promoted aside from the big companies. A balance should be created of the websites for these two sizes of companies. 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.
If a website has very good news on technology developments, plenty of bloggers and surfers will follow and offer ideas, comments and suggestions about subjects featured. This kind of platform will be an agenda for discussions among the creative high tech people that will be a start of something new. A two way communications should be the goal of a good website that you would want to be in. 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.
Accessing the latest software demo of any release is the dream of every high tech fan. 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.
An information overload is a possibility with the many information available online. Visiting blogs regularly will give you an update on what are new in the technology world. Blogs are reliable sources of information and these can be trusted. It is known that the number of bloggers are increasing because of the reliability and advanced information they give.
Source: Tech News