<p>Dear Amazon Web Services Customer,</p>% P* i2 q e. O+ } n- \- |# B
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<p>We are excited to announce that Route 53 DNS Failover now supports 2 I0 d. E# g! [* L& g8 j/ v
Elastic Load Balancing (ELB) endpoints. Starting today, you can use 0 h; w7 |* }$ ?5 g( y
Route 53’s existing health checking and DNS failover features for - C9 Q. X) ]/ k
applications running behind an ELB, to increase redundancy and & h2 f- ^: C+ z, H9 ~
availability for these apps.</p> 4 ?4 X* _# r* W7 r. ~
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<p>With DNS Failover, Amazon Route 53 can help detect an outage of your 6 O1 y& @$ }3 _5 T3 A6 `- g
website and redirect your end users to alternate locations where your % \- r' T/ m2 w' u' S2 s1 i, Y. F
application is operating properly. When you enable this feature, Route 5 H; N' @1 H1 p: M4 }( Z
53 uses health checks—regularly making Internet requests to your 0 K1 C( }, U1 S' I
application’s endpoints from multiple locations around the world—to ( u+ T& e* V$ Z7 f$ `
determine whether each endpoint of your application is up or down. </p>) L: w/ i: W* L0 u3 e9 h
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<p>For ELB endpoints, Route 53 evaluates the health of the load balancer % w2 n1 l4 V4 T4 Q. M+ Z+ c
itself and the health of your application running on the EC2 instances ; V2 r1 |/ R8 F/ K7 g# ^+ s
behind it. If any part of the stack goes down, Route 53 detects the / n0 O6 I% p4 e( C% d) U- V
failure, routes traffic away from the load balancer, and directs traffic; f6 T4 Q4 t% N+ s
to other healthy ELB endpoints. Route 53 DNS Failover also supports EC2! [) ~. V' D# M: T- H8 o! _ A
endpoints as well as endpoints located in your own datacenter.</p> 5 d' H, g0 R# R+ M" W a3 I6 }* O
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<p>Using Route 53 DNS Failover, you can run your primary application 3 M1 c0 w: {2 l# W
simultaneously in multiple AWS regions around the world. Route 53 9 ^8 V. X) o' h8 y* I
automatically removes from service any region where your application is ; ?2 o/ ?) Y9 y$ @0 Q; X1 }, M! y
unavailable. You can also take advantage of a simple backup site hosted 7 F# D' F) T# ~2 J/ y$ y
on Amazon Simple Storage Service (Amazon S3), with Route 53 directing , ^6 Y5 x; n% q5 S
users to this backup site in the event that your application becomes - }, D4 m9 _4 o' v' i+ v
unavailable.</p> 3 M& q- X" A2 b3 L
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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: F4 m1 W* m( P
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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> 5 L3 D7 Y, O. W: R4 S
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<p>Sincerely,9 s* S! {+ N* r& D0 ?
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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 + failover8 C8 W/ O2 v I" g8 ?$ f
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