基于 Nginx+lua+Memcache 实现灰度发布
一、灰度发布原理说明
执行过程：
当用户请求到达前端代理服务Nginx，内嵌的lua模块解析Nginx配置文件中的lua脚本代码；
Lua变量获得客户端IP地址，去查询memcached缓存内是否有该键值，如果有返回值执行@client_test，否则执行@client。
Location @client_test把请求转发给部署了new版代码的服务器，location @client把请求转发给部署了normal版代码的服务器，服务器返回结果。整个过程完成。
下面把安装配置过程详细说明。
二、安装配置过程详解
1、安装nginx
安装依赖包
yum -y install gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5 krb5-devel libidn libidn-devel openssl openssl-devel openldap openldap-devel nss_ldap openldap-clients openldap-servers make pcre-devel
yum -y install gd gd2 gd-devel gd2-devel lua lua-devel
yum –y install memcached下载lua模块、lua-memcache操作库文件和nginx包
wget https://github.com/simpl/ngx_devel_kit/archive/v0.2.18.tar.gz
wget https://github.com/chaoslawful/lua-nginx-module/archive/v0.8.5.tar.gz
wget https://github.com/agentzh/lua-resty-memcached/archive/v0.11.tar.gz
wget http://nginx.org/download/nginx-1.4.2.tar.gz
#解压编译安装
tar xvf nginx-1.4.2.tar.gz
cd nginx-1.4.2/
./configure \
--prefix=/soft/nginx/ \
--with-http_gzip_static_module \
--add-module=/root/ngx_devel_kit-0.2.18/ \
--add-module=/root/lua-nginx-module-0.8.5/
make&&make install拷贝lua的memcached操作库文件
tar xvf v0.11.tar.gz
cp -r lua-resty-memcached-0.11/lib/resty/ /usr/lib64/lua/5.1/配置nginx
#vim /soft/nginx/conf/nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
proxy_next_upstream error timeout;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $http_x_forwarded_for;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 100m;
client_body_buffer_size 256k;
proxy_connect_timeout 180;
proxy_send_timeout 180;
proxy_read_timeout 180;
proxy_buffer_size 8k;
proxy_buffers 8 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
upstream client {
server 192.168.200.29:80;
}
upstream client_test {
server 192.168.200.29:81;
}
server {
listen 80;
server_name localhost;
location / {
content_by_lua '
clientIP = ngx.req.get_headers()["X-Real-IP"]
if clientIP == nil then
clientIP = ngx.req.get_headers()["x_forwarded_for"]
end
if clientIP == nil then
clientIP = ngx.var.remote_addr
end
local memcached = require "resty.memcached"
local memc, err = memcached:new()
if not memc then
ngx.say("failed to instantiate memc: ", err)
return
end
local ok, err = memc:connect("127.0.0.1", 11211)
if not ok then
ngx.say("failed to connect: ", err)
return
end
local res, flags, err = memc:get(clientIP)
if err then
ngx.say("failed to get clientIP ", err)
return
end
if res == "1" then
ngx.exec("@client_test")
return
end
ngx.exec("@client")
';
}
location @client{
proxy_pass http://client;
}
location @client_test{
proxy_pass http://client_test;
}
location /hello {
default_type 'text/plain';
content_by_lua 'ngx.say("hello, lua")';
}
location = /50x.html {
root html;
}
}
}检测配置文件。
#/soft/nginx/sbin/nginx -t
nginx: the configuration file /soft/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /soft/nginx/conf/nginx.conf test is successful启动nginx
/soft/nginx/sbin/nginx启动memcached服务
memcached -u nobody -m 1024 -c 2048 -p 11211 –d三、测试验证
telnet localhost 11211
Trying ::1...
Connected to localhost.
Escape character is '^]'.
set 192.168.68.211 0 3600 1
1
STORED
get 192.168.68.211
VALUE 192.168.68.211 9 1
1
END
quit 
来源：nblogs.com/wenbiao/p/3227998.html
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