Nginx的Cache緩存

隨着Nginx web服務器獲得愈來愈多的SA的青睞,Nginxcache功能已經具有Squid所擁有的Web緩存加速功能、清除指定URL緩存的功能。javascript

而在性能上,Nginx對多核CPU的利用,賽過Squid很多。另外,在反向代理、負載均衡、健康檢查、後端服務器故障轉移、Rewrite重寫、易用性上,Nginx也比Squid強大得多。php

這使得一臺Nginx能夠同時做爲負載均衡服務器與Web緩存服務器來使用。css

1、 NginxNgx_cache)安裝:html

首先下載Nginx緩存模塊,ngx_cache_purge相應版本,這裏下載nginx-1.4版本,不一樣版本對應不一樣的Nginx版本,安裝的時候要留心。java

ulimit -SHn 65535node

yum install pcre pcre-devel -ynginx

wget http://nginx.org/download/nginx-1.0.11.tar.gzweb

http://labs.frickle.com/files/ngx_cache_purge-1.4.tar.gzshell

tarz xvf ngx_cache_purge-1.4.tar.gz後端

tarz xvf nginx-1.0.11.tar.gz

useradd www

cd nginx-1.0.11/

./configure --user=www --group=www --add-module=../ngx_cache_purge-1.4--prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module

make && make install

2、 Nginx Cache配置:

user www www;

worker_processes 8;

error_log /data/logs/nginx/error.log crit;

pid /usr/local/nginx/nginx.pid;

worker_rlimit_nofile 65535;

events

{

use epoll;

worker_connections 65535;

}

http

{

include mime.types;

default_type application/octet-stream;

charset utf-8;

server_names_hash_bucket_size 128;

client_header_buffer_size 32k;

large_client_header_buffers 4 32k;

client_max_body_size 300m;

sendfile on;

tcp_nopush on;

keepalive_timeout 60;

tcp_nodelay on;

client_body_buffer_size 512k;

proxy_connect_timeout 5;

proxy_read_timeout 60;

proxy_send_timeout 5;

proxy_buffer_size 16k;

proxy_buffers 4 64k;

proxy_busy_buffers_size 128k;

proxy_temp_file_write_size 128k;

gzip on;

gzip_min_length 1k;

gzip_buffers 4 16k;

gzip_http_version 1.1;

gzip_comp_level 2;

gzip_types text/plainapplication/x-javascript text/css application/xml;

gzip_vary on;

proxy_temp_path /data/proxy_temp_dir;

proxy_cache_path /data/proxy_cache_dirlevels=1:2 keys_zone=cache_one:200m inactive=1d max_size=30g;

upstreambackend_server {

server 127.0.0.1:8800 weight=1 max_fails=2 fail_timeout=30s;

server 127.0.0.1:8801 weight=1 max_fails=2 fail_timeout=30s;

}

server

{

listen 80;

server_name localhost;

index index.html index.htm;

root /data/webapps/www;

location /

{

proxy_next_upstream http_502 http_504 error timeout invalid_header;

proxy_cache cache_one;

proxy_cache_valid 200 304 12h;

proxy_cache_key $host$uri$is_args$args;

proxy_set_header Host $host;

proxy_set_header X-Forwarded-For $remote_addr;

proxy_pass http://backend_server;

expires 1d;

}

location ~ /purge(/.*)

{

auth_basic "TDT Center CACHE Center";

auth_basic_user_file /tmp/htpasswd;

allow 127.0.0.1;

allow 192.168.1.0/24;

deny all;

proxy_cache_purge cache_one $host$1$is_args$args;

}

location ~ .*\.(php|jsp|cgi)?$

{

proxy_set_header Host $host;

proxy_set_header X-Forwarded-For $remote_addr;

proxy_pass http://backend_server;

}

}

}


3、Nginx Cache測試:

#啓動Nginx服務,/usr/local/nginx/sbin/nginx

#訪問咱們的WEB站點,而後在/data/proxy_cache_dir目錄會看到緩存的子目錄(以數字、字母組成)

以下圖:

4、如何清除緩存:

清除緩存有兩種方法,第一種是直接經過nginx.conf配置文件定義的/purge虛擬目錄去清除,第二種方法能夠經過shell腳本去批量清除:

附上Shell腳本清空緩存的內容:

#! /bin/sh

#Auto Clean Nginx Cache Shell Scripts

#2013-06-12 wugk

#Define Path

CACHE_DIR=/data/www/proxy_cache_dir/

FILE="$*"

#To determine whether the input scriptIf not,then exit 判斷腳本是否有輸入,沒有輸入而後退出

if

[ "$#" -eq "0" ];then

echo "Please Insert clean Nginx cache File, Example: $0 index.html index.js"

sleep 2 && exit

fi

echo "The file : $FILE to be clean nginx Cache ,please waiting ....."

#Wrap processing for the input file, for grep lookup,對輸入的文件進行換行處理,利於grep查找匹配相關內容

for i in `echo $FILE |sed 's//\n/g'`

do

grep -ra $i ${CACHE_DIR}| awk -F':' '{print $1}' > /tmp/cache_list.txt

for j in `cat/tmp/cache_list.txt`

do

rm -rf $j

echo "$i $j is Deleted Success !"

done

done

這幾天要用到nginx的緩存,折騰了兩天,終於搞定了,

把方法寫下來以示備忘或給後來者一個參考:

首先用的緩存是proxy_cache.

http段里加入下列幾句:

[plain] view plaincopy

1. #!/usr/bin/env php

2. <?php

3.

4. $cache_dir = '/usr/local/nginx/cache/';

5. $request_uri = $argv[1];

6. $url_hash = md5($request_uri);

7. $dir1 = substr($url_hash,-1,1) . '/';

8. $dir2 = substr($url_hash,-3,2) . '/';

9. $cached_file = $cache_dir . $dir1 . $dir2 . $url_hash;

10. if (is_file($cached_file)) {

11. if (unlink($cache_dir . $dir1 . $dir2 . $url_hash)) {

12. echo $request_uri . " 緩存清除成功\n";

13. } else {

14. echo $request_uri . " 緩存清除失敗\n";

15. }

16. } else {

17. echo $request_uri . " 未被緩存\n";

18. }


各項註釋晚上我回家後有時間再寫,見諒!

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