Wordpress and NGINX with Reverse Proxy

backend.conf

server {
    listen ****; # 80番以外の競合しないポート
    server_name blog.hifumi.info;
    client_max_body_size 20M;

    # Root
    location / {
        root  /usr/local/www/wordpress;
        index index.html index.htm index.php;
            if (-f $request_filename) {
                expires 30d;
                break;
            }
            if (!-e $request_filename) { rewrite ^(.+)$ /index.php?q=$1 last; }
    }
    try_files $uri $uri/ /index.php?q=$uri&$args;

    # Error Page
    error_page  404 /404.html;
    location = /404.html { root /usr/local/www/wordpress; }
    error_page  500 502 503 504 /50x.html;
    location = /50x.html { root /usr/local/www/wordpress; }

    # PHP-FPM
    location ~ \.php$ {
        fastcgi_pass  127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME /usr/local/www/wordpress$fastcgi_script_name;
        fastcgi_param SCRIPT_NAME $fastcgi_script_name;
        include       /usr/local/etc/nginx/fastcgi_params;
    }
}

frontend.conf

server {
    listen 80;
    server_name blog.hifumi.info;
    client_max_body_size 20M;

    access_log /var/log/nginx/wp_rproxy.access.log;
    error_log  /var/log/nginx/wp_rproxy.error.log;

    # Proxy Cache for mobile
    set $mobile "";
    if ($http_user_agent ~* '(DoCoMo|J-PHONE|Vodafone|MOT-|UP\.Browser|DDIPOCKET|ASTEL|PDXGW|Palmscape|Xiino|sharp pda browser|Windows CE|L-mode|WILLCOM|SoftBank|Semulator|Vemulator|J-EMULATOR|emobile|mixi-mobile-converter|PSP)') { set $mobile "@ktai"; }
    if ($http_user_agent ~* '(iPhone|iPod|Opera Mini|Android.*Mobile|NetFront|BlackBerry)') { set $mobile "@mobile"; }
    if ($http_cookie ~* "wptouch(_switch_cookie=normal|-pro-view=desktop)") { set $mobile "@mobile.off"; }

    # Proxy Cache
    location /wp-admin { proxy_pass http://backend; }
    location ~ .*\.php { proxy_pass http://backend; }
    location ~ .*\.(txt|xml|html?|js|css|gz|ico|jpe?g|JPE?G|gif|GIF|png|PNG|wmv|WMV|flv|FLV|mpg|MPG|svg|SVG) {
        root  /usr/local/www/wordpress/;
        index index.php;
        if (-f $request_filename) {
            expires 30d;
            break;
        }
    }

    location / {
        if ($http_cookie ~* "comment_author_|wordpress_(?!test_cookie)|wp-postpass_") { set $do_not_cache 1; }
        proxy_no_cache     $do_not_cache;
        proxy_cache_bypass $do_not_cache;
        proxy_cache        czone;
        proxy_cache_key    "$scheme://$host$request_uri$is_args$args$mobile";
        proxy_cache_valid  200 301 302 10m;
        proxy_cache_valid  404 5m;
        proxy_pass         http://backend;
    }

    # Purge Proxy Cache
    location ~ /purge(/.*) {
        allow 127.0.0.1;
        allow 219.94.241.187; # サーバIP
        deny  all;
        proxy_cache_purge czone "$scheme://$host$1$is_args$args$mobile";
    }
}

gzip.conf

gzip            on;
gzip_types      text/plain             text/xml
                text/css               text/javascript
                application/xml        application/xhtml+xml
                application/rss+xml    application/atom+xml
                application/javascript application/x-javascript
                application/json       application/x-httpd-php;
gzip_disable    "MSIE [1-6]\.";
gzip_proxied    any;
gzip_vary       on;
gzip_min_length 1k;

nginx.conf

user    www;
worker_processes 2;

error_log /var/log/nginx/error.log;
pid       /var/run/nginx.pid;

events {
    multi_accept       on;
    worker_connections 1024;
}

http {
    include           mime.types;
    include           proxy.conf; # プロキシ用ファイル
    include           gzip.conf;  # gzip用設定ファイル
    default_type      application/octet-stream;
    autoindex         off;
    server_tokens     off;
    charset           utf-8;
    sendfile          on;
    tcp_nopush        on;
    keepalive_timeout 60;

    upstream backend {
        ip_hash;
        server 127.0.0.1:****; # backendのLISTEN番号に合わせる
    }

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    access_log /var/log/nginx/access.log main;

    include details/*.conf; # ./detailsに設定ファイルを用意する
}

proxy.conf

proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=czone:10m max_size=2g inactive=30m;
proxy_temp_path  /tmp/nginx;
proxy_cache_key  "$scheme://$host$request_uri";
proxy_set_header Host               $host;
proxy_set_header X-Real-IP          $remote_addr;
proxy_set_header X-Forwarded-Host   $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;