server {
    location / {
        set            $memcached_key "$uri?$args";  # 設(shè)置Memcached緩存key
        memcached_pass 127.0.0.1:11211;              # 設(shè)置被代理Memcached地址
        error_page     404 502 504 = @fallback;      # 返回狀態(tài)碼404、502、504時(shí)跳入內(nèi)部請(qǐng)求
    }
    location @fallback {
        proxy_pass     http://backend;               # 將請(qǐng)求轉(zhuǎn)發(fā)給后端服務(wù)器
    }
}

yum -y install memcached
cat /etc/sysconfig/memcached
PORT="11211"                  # 端口
USER="memcached"
MAXCONN="1024"          # 最大連接數(shù)
CACHESIZE="64"              # 使用內(nèi)存大小為64M
OPTIONS=""
systemctl start memcached

upstream backend {
    server 192.168.2.145:8190;                              # 后端PHP服務(wù)器IP
}
upstream memcached {
    hash $host$request_uri consistent;                      # 一致性hash
    server 192.168.2.145:11211;                             # Memcached服務(wù)器IP
    server 192.168.2.109:11211;                             # Memcached服務(wù)器IP
}
server {
    listen       8181;
    access_log logs/mem_access.log;
    set $memcached_key $host$request_uri;                   # 設(shè)置Memcached的key
    location / {
        memcached_connect_timeout 5s;             # 與Memcached建立連接超時(shí)時(shí)間為5s
        memcached_read_timeout 2s;                # 連續(xù)兩次讀的超時(shí)時(shí)間為2s
        memcached_send_timeout 2s;                # 連續(xù)兩次寫(xiě)的超時(shí)時(shí)間為2s
        memcached_pass memcached;                 # 代理到Memcached集群
        add_header X-Cache-Satus HIT;             # 顯示緩存命中狀態(tài)
        add_header Content-Type 'text/html; charset=utf-8'; # 強(qiáng)制響應(yīng)數(shù)據(jù)格式為html
    }
    error_page     404 502 504 = @fallback;
    location @fallback {
        proxy_set_header   X-Memcached-Key $memcached_key;  # 將memecached key傳遞
                                                            # 給PHP服務(wù)器
        proxy_pass     http://backend;                      # PHP服務(wù)器
    }
}