apache - Best choice for 5k request spikes on dynamic server -

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i building backend supposed handle 5k request spikes. application photo sharing app uses sql database, php handle requests , x-sendfile send images user. best setup server wise? have build haproxy load balancer 2 apache servers have shared folder access images , database server. 4 servers in total. may install memcached save processing. hold? setup? have suggestions on improvements or better solutions?


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