Interesting things
接着上一篇。
What did you do today
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我们需要在tracker1和tracker2配置反向代理服务，那么你肯定会问了什么是反向代理服务？
反向代理(Reverse Proxy)方式是指以代理服务器来接受internet上的连接请求，然后将请求转发给内部网络上的服务器，并将从服务器上得到的结果返回给internet上请求连接的客户端，此时代理服务器对外就表现为一个反向代理服务器。
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在tracker1和tracker2上解压ngx_cache_purge-2.3.tar.gz文件到/usr/local/fast/
命令：tar zxvf ngx_cache_purge-2.3.tar.gz -C /usr/local/fast/
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我们发现/usr/local/fast/目录下多了ngx_cache_purge-2.3文件夹。
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下载依赖库 yum install pcre、yum install pcre-devel、yum install zlib、yum install zlib-devel
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解压nginx-1.6.2.tar.gz到/usr/local/目录下，命令: tar -zxvf nginx-1.6.2.tar.gz -C /usr/local/
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进入/usr/local/nginx-1.6.2/目录下，
cd /usr/local/nginx-1.6.2/
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添加ngx_cache_purge-2.3模块并且检查。命令:./configure --add-module=/usr/local/fast/ngx_cache_purge-2.3/
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老操作，make && make install编译安装nginx。
- 进入/usr/local/nginx/conf/目录下，找到nginx.conf，配置反向代理。
#user nobody; worker_processes 1;
error_log /usr/local/nginx/logs/error.log;
error_log /usr/local/nginx/logs/error.log notice;
error_log /usr/local/nginx/logs/error.log info;
pid /usr/local/nginx/logs/nginx.pid;
events {
worker_connections 1024;
use epoll;
}
http {
include mime.types;
default_type application/octet-stream;
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 /usr/local/nginx/logs/access.log main;
sendfile on;
tcp_nopush on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;
client_max_body_size 300m;
proxy_redirect off;
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 16k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
proxy_cache_path /fastdfs/cache/nginx/proxy_cache levels=1:2
keys_zone=http-cache:200m max_size=1g inactive=30d;
proxy_temp_path /fastdfs/cache/nginx/proxy_cache/tmp;
upstream fdfs_group1 {
server 192.168.12.33:8888 weight=1 max_fails=2 fail_timeout=30s;
server 192.168.12.44:8888 weight=1 max_fails=2 fail_timeout=30s;
}
upstream fdfs_group2 {
server 192.168.12.55:8888 weight=1 max_fails=2 fail_timeout=30s;
server 192.168.12.66:8888 weight=1 max_fails=2 fail_timeout=30s;
}
server {
listen 8000;
server_name localhost;
#charset koi8-r;
access_log /usr/local/nginx/logs/host.access.log main;
location / {
root html;
index index.html index.htm;
}
location /group1/M00 {
proxy_next_upstream http_502 http_504 error timeout invalid_header;
proxy_cache http-cache;
proxy_cache_valid 200 304 12h;
proxy_cache_key $uri$is_args$args;
proxy_pass http://fdfs_group1;
expires 30d;
}
location /group2/M00 {
proxy_next_upstream http_502 http_504 error timeout invalid_header;
proxy_cache http-cache;
proxy_cache_valid 200 304 12h;
proxy_cache_key $uri$is_args$args;
proxy_pass http://fdfs_group2;
expires 30d;
}
location ~/purge(/.*) {
allow 127.0.0.1;
allow 192.168.12.0/24;
deny all;
proxy_cache_purge http-cache $1$is_args$args;
}
# location ~/group([0-9])/M00 {
# ngx_fastdfs_module;
# }
#error_page 404 /404.html;
#redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}}
* 创建/fastdfs/cache/nginx/proxy_cache
和/fastdfs/cache/nginx/proxy_cache/tmp，因为proxy_cache_path和proxy_temp_path设置了路径，所以我们要创建。
* 由于tracker1和tracker2的端口是8000，所以需要在防火墙配置8000端口。
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8000 -j ACCEPT，然后重启防火墙，让策略生效。
* 启动tracker1和tracker2的nginx。命令：/usr/local/nginx/sbin/nginx
* 我们在tracker1上传2张图片，发现一张存储在group1，一张存储在group2.
* 我们可以通过tracker1(192.168.12.11)和tracker2(192.168.12.22)的8000端口去访问这2张图片。
* 访问http://192.168.12.11:8000/group1/M00/00/00/wKgMIVpEgoSAcs8VAADRd6mMX3g514.jpg
* 访问http://192.168.12.22:8000/group2/M00/00/00/wKgMQlpEgoaABUrWAADRd6mMX3g168.jpg
###Summary
> Nginx对外提供服务有可能碰到服务挂掉的时候，我们需要搭建一个nginx和keepalived集合实现的nginx集群高可用环境，下一篇讲。
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