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2.1 ÂÖѯ£¨Round Robin£©

ÂÖѯÊÇNginxĬÈϵĸºÔØƽºâËã·¨¡£Ëü°´Ë³Ðò½«ÇëÇó·ÖÅɸøºó¶ËЧÀÍÆ÷£¬¼á³Öÿ¸öЧÀÍÆ÷µÄ¸ºÔØÏà¶Ôƽºâ¡£µ±ÓÐеÄÇëÇóµÖ´ïʱ£¬Nginx½«Æ¾Ö¤ÊÂÏȽç˵µÄupstreamÖеÄЧÀÍÆ÷Áбí˳ÐòÒÀ´Î½«ÇëÇóת·¢¸øÿ¸öЧÀÍÆ÷¡£

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upstream backend {
    server 192.168.1.101;
    server 192.168.1.102;
    server 192.168.1.103;
}

server {
    location / {
        proxy_pass http://backend;
    }
}

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2.2 ¼ÓȨÂÖѯ£¨Weighted Round Robin£©

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upstream backend {
    server 192.168.1.101 weight=3;
    server 192.168.1.102 weight=2;
    server 192.168.1.103 weight=1;
}

server {
    location / {
        proxy_pass http://backend;
    }
}

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2.3 IP Hash

IP HashËã·¨ÊÇƾ֤ÇëÇóµÄ¿Í»§¶ËIPµØµã¾ÙÐÐhashÅÌË㣬Ȼºó½«ÇëÇóת·¢¸ø¶ÔÓ¦µÄЧÀÍÆ÷¡£ÕâÑù¿ÉÒÔʹÀ´×Ôͳһ¸öIPµØµãµÄÇëÇó¶¼×ª·¢µ½Í³Ò»Ì¨Ð§ÀÍÆ÷£¬ÊµÏÖSession¼á³Ö¡£

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upstream backend {
    ip_hash;
    server 192.168.1.101;
    server 192.168.1.102;
    server 192.168.1.103;
}

server {
    location / {
        proxy_pass http://backend;
    }
}

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3.1 ¾²Ì¬ÉèÖÃ

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3.2 ¶¯Ì¬ÉèÖÃ

¶¯Ì¬ÉèÖÃÊÇƾ֤ÏÖʵÔËÐÐʱµÄЧÀÍÆ÷¸ºÔØÇéÐÎÀ´¶¯Ì¬µ÷½â¸ºÔØƽºâËã·¨ºÍÕ½ÂÔÑ¡Ôñ¡£NginxÌṩÁËһЩÏà¹ØµÄÄ£¿é£¬Èçnginx-plus-upsyncºÍnginx-upsync-module£¬¿ÉÒÔͨ¹ý°´ÆÚ¼ì²éºó¶ËЧÀÍÆ÷״̬£¬²¢×Ô¶¯µ÷½âȨÖØÖµ¡¢Ìí¼Ó¡¢É¾³ýºÍÐ޸ĺó¶ËЧÀÍÆ÷£¬ÒÔʵÏÖ¶¯Ì¬¸ºÔØƽºâ¡£

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upstream backend {
    zone backend 64k;
    server 192.168.1.101;
    server 192.168.1.102;
    server 192.168.1.103;
    keepalive 64;
    hash $remote_addr consistent;
}

server {
    location / {
        proxy_pass http://backend;
    }
}

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±¾ÎÄÉîÈëÃ÷È·ÁËNginxµÄ¸ºÔØƽºâËã·¨ºÍÕ½ÂÔÑ¡ÕªÒªÁì¡£ÔÚÏÖʵ¿ª·¢ÖУ¬Æ¾Ö¤ÏÖʵÐèÇóÑ¡ÔñºÏÊʵĸºÔØƽºâËã·¨ºÍÕ½ÂÔÑ¡ÕªÒªÁ죬¿ÉÒÔÓÐÓÃÌá¸ßÓ¦ÓõÄÐÔÄܺͿɿ¿ÐÔ¡£Í¬Ê±£¬Ïàʶ¶¯Ì¬ÉèÖõÄÒªÁ죬¿ÉÒÔƾ֤ЧÀÍÆ÷¸ºÔØÇéÐζ¯Ì¬µ÷½â¸ºÔØƽºâÕ½ÂÔ£¬½øÒ»²½ÌáÉýÓ¦ÓõÄÎȹÌÐԺͿÉÀ©Õ¹ÐÔ¡£

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Nginx Documentation – http://nginx.org/en/docs/

Nginx Load Balancing – http://nginx.org/en/docs/http/load_balancing.html

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