How to have 100% uptime?

100% uptime is not EASILY accomplished, no matter how many fail-overs you have, cloud-based, CDNs and so forth. If anyone sells you on having 100% uptime, remember that even a 1 second fail is a breach of contract. NO ONE can guarantee that. Just look at the biggest, most powerful webmaster out there - Facebook, Twitter, Google - they ALL have timeouts.

 

A simple way to approach to achieve close to 100% uptime would be to use two geographically diversed servers with constant monitoring (checked more than once per minute) and a domain name with <30s TTL. Then you can wire up the monitoring directly to your DNS provider to switch off the offline server until it comes back online. So worst case scenario (if the second server works of course) you get let's say a 20 second downtime for 50% of your users when something unplanned goes wrong. You could additionally improve this by using two servers on each of the locations and load balance them with a hardware load balancer. This way only actual network downtime would affect you. If you pick quality providers without a single point of network failure, this probably puts you to 99.9999 or more uptime which averages around ~2.6s monthly. Theoretically~

 

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I would suggest the site Hostony, here you can get the cheap and best web hosting service.
I have hosted my website here.The servers are 99% uptime.
They are also providing many features and supporting with excellent customer service at 24/7.
This is the most safe,secure and reliable website.

 

99% isn't really that great. It's almost 4 days downtime, and kinda crappy. Minimum should be 99.5%