<p>Dear Amazon Web Services Customer,</p>* d- _0 [# Y6 D# N% C9 Y5 S
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<p>We are excited to announce that Route 53 DNS Failover now supports + k2 q3 ]% a: H% r. w) }1 N
Elastic Load Balancing (ELB) endpoints. Starting today, you can use : g2 f. R# e& f9 a3 P) o* G! s# M
Route 53’s existing health checking and DNS failover features for & E2 D2 a/ d1 D: s9 L7 A6 t$ T% \
applications running behind an ELB, to increase redundancy and 5 b2 x# ]! g2 s: m
availability for these apps.</p>9 t" v* e) G( r8 {' @- Z; c# @; t
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<p>With DNS Failover, Amazon Route 53 can help detect an outage of your " U( c: E2 _$ z! O
website and redirect your end users to alternate locations where your & M2 J# p% j0 q3 E
application is operating properly. When you enable this feature, Route * @) l' ?; @# b" x4 F
53 uses health checks—regularly making Internet requests to your 4 q( _3 E& v6 b9 B8 D5 F
application’s endpoints from multiple locations around the world—to 2 I) k/ H+ d4 m/ X
determine whether each endpoint of your application is up or down. </p>: q0 U( Y r2 e, I" I
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<p>For ELB endpoints, Route 53 evaluates the health of the load balancer/ m" m4 X( r; u6 T0 R
itself and the health of your application running on the EC2 instances 3 {7 j" N: l& Y$ [7 X" D. C" W; I
behind it. If any part of the stack goes down, Route 53 detects the * o4 O) {. P" l- c& k
failure, routes traffic away from the load balancer, and directs traffic / V2 \9 v% C5 N: K, ]3 t2 E
to other healthy ELB endpoints. Route 53 DNS Failover also supports EC2 ; h2 a; ]. G9 k$ v$ _* X/ S
endpoints as well as endpoints located in your own datacenter.</p>$ C9 |* z: X) j" `5 z; S% p
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<p>Using Route 53 DNS Failover, you can run your primary application * K3 L; E( T1 A1 M/ X4 N
simultaneously in multiple AWS regions around the world. Route 53 # z( W+ r7 M" |6 n; Q
automatically removes from service any region where your application is # D- A* v j& N$ Q2 @2 Y
unavailable. You can also take advantage of a simple backup site hosted + H% ?- M7 ]" Y' Y
on Amazon Simple Storage Service (Amazon S3), with Route 53 directing # W |/ X. y. X
users to this backup site in the event that your application becomes ' ^4 u+ a1 ]4 e
unavailable.</p>+ c. l/ }% z$ t' c4 K% z
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<p>Health checks of Amazon ELB endpoints are free, and getting started is easy. To learn more, <a href="http://www.amazon.com/gp/r.html?R=2EMCE4T8E0NWD&C=3STR8RC5Q6H1Y&H=SUOGRM79MBBGDQ7LV8TUA2X4AYIA&T=C&U=http%3A%2F%2Faws.amazon.com%2Froute53%3Fref_%3Dpe_2170_30194830_8">visit the Route 53 product page</a> or review our walkthrough in the <a href="http://www.amazon.com/gp/r.html?R=2EMCE4T8E0NWD&C=3STR8RC5Q6H1Y&H=XGI2ROQULL3C7OX10QVMHGAWVRMA&T=C&U=http%3A%2F%2Fdocs.aws.amazon.com%2FRoute53%2Flatest%2FDeveloperGuide%2Fdns-failover.html%3Fref_%3Dpe_2170_30194830_9">Amazon Route 53 Developer Guide</a>.</p>/ ^; M% F+ m7 r* i9 O
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<p>Also, please feel free to join our <a href="http://www.amazon.com/gp/r.html?R=2EMCE4T8E0NWD&C=3STR8RC5Q6H1Y&H=J5S7YSYDGDMA3VFQM4MDM14GRX4A&T=C&U=http%3A%2F%2Fw.on24.com%2Fr.htm%3Fe%3D622099%26s%3D1%26k%3D3563EF264F8961EAF9AD217B6CE34446%26partnerref%3DLE%26ref_%3D7">webinar at 10:00 am PDT on July 9, 2013</a> to learn more about DNS Failover and the high-availability architecture options that it makes possible.</p>& E9 v0 i: h- n0 U* L
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<p>Sincerely, & K( g! O/ D/ O! V3 d
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The Amazon Web Services Team</p>
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对于使用route53的同学是个好事,简单的 geo dns + failover: X( p4 p' k& N3 m; R W