Most Powerful High Availability / Load Balancing #yapcasia 2012

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Most Powerful High Availability Load Balancing Sep, 29, 2012 YAPC::Asia 2012 @riywo

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@riywo

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http://www.publicdomainpictures.net/view-image.php?image=4314&picture=t-shirt-image

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Talk about.... * Why is this good? * Why is this bad?

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HALB

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What?

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LB Server Server Server Server

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HA Server Server Server Server ✗ Health Check

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Same!

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Where?

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HA LB Web Web Web Web User

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HA LB DB DB DB DB Web

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HA LB API API API API Web

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Anywhere!

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How?

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BIG-IP ServerIron

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LVS

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HAProxy

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mod_proxy

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nginx

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ELB

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MyDNS

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Pros/Cons

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Pros Cons H/W Inline (DSR) Powerful Difficult Expensive Proxy Inline (DSR) Easy to use Performance DNS No proxy Performance Difficult

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Pros Cons H/W Inline (DSR) Powerful Difficult Expensive Proxy Inline (DSR) Easy to use Performance DNS No proxy Performance Difficult

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DNS

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No Proxy

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DNS DB DB DB DB Web 1 2 Weighted-DNS RoundRobin HA LB

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Cache

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DNS DB DB DB DB Web 2 Cache 1 3

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Cache is Difficult

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DNS DB DB DB DB Web Cache ✗ Health Check

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DNS DB DB DB DB Web Cache ✗ Health Check Inconsistent

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Solution

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Client DNS

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DNS DB DB DB DB Web ✗ Health Check

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Too many Health Check

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DB DB DB DB DNS Web ✗ Health Check DNS Web DNS Web Health CheckHealth Check

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Solution

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Eventual Consistent

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DB DB DB DB DNS Web ✗ DNS Web DNS Web Health Check DNS 2 Async 1

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How?

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DB DB DB DB ✗ MyDNS Web Health Check MyDNS 1 2 Replication MyDNS Web MyDNS Web

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Good Points

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* Clients know all info * Eventual Consistent * Any Application:)

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Bad Points

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* Too much... * Async difficult

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Join us! * Perl Mongers * Operation Engineers

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Join us! * Perl Mongers * Operation Engineers * Baseball Players :)

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Thanks!

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@riywo blog.riywo.com weblog.riywo.com