ABTest及相关实践
ABTest基础理念
A/B测试（也称为分割测试或桶测试）是比较网页或应用程序的两个版本以确定哪一个更好地执行的方法。
Ngnix安装
在两台机器上（我的两台机器地址为：114.115.162.219、114.115.162.141）安装nginx，具体的操作如下所示：
# 通过rpm安装nginx
rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
# 查看nginx信息
yum info nginx
# 安装nginx
yum install nginx
# 启动nginx
service nginx start
# 查看nginx服务
curl -i localhost
编写服务端demo
在hello.py中使用flask写一个小的server端程序
from flask import Flask
from multiprocessing import Process
app1 = Flask("app1")
app2 = Flask("app2")
app3 = Flask("app3")
HOST = "0.0.0.0"
@app1.route("/a_test")
def hello():
return "Hello World1!"
@app2.route("/a_test")
def hello():
return "Hello World2!"
@app3.route("/b_test")
def hello():
return "Hello World3!"
p1 = Process(target=app1.run, args=(HOST, 9001))
P2 = Process(target=app1.run, args=(HOST, 9002))
P3 = Process(target=app1.run, args=(HOST, 9003))
p1.start()
p2.start()
p3.start()
并启用server服务
nohup python hello.py &
nginx负载配置
配置nginx负载，编辑/etc/nginx/conf.d/default.conf文件
# 添加一个upstream
upstream a_test {
server your_ip:9001 weight=1;
server your_ip:9002 weight=2;
}
server {
location /a_test {
#root /usr/share/nginx/html;
#index index.html index.htm;
proxy_pass http://a_test;
proxy_set_header Host &host;
proxy_set_header X-Real-IP &remote_addr;
proxy_set_header X-Forwarded-For &proxy_add_x_forwarded_for;
}
}
使用lua-nginx-module模块对nginx流量进行复制转发。
install luajit
git clone http://luajit.org/git/luajit-2.0.git
cd luajit-2.0
make
make install PREFIX=/usr/local/luajit
echo "/usr/local/luajit/lib" > /etc/ld.so.conf.d/usr_local_luajit_lib.conf
ldconfig
export LUAJIT_LIB=/usr/local/luajit/lib
export LUAJIT_INC=/usr/local/luajit/include/luajit-2.0
Reinstall nginx
rpm -e nginx-release-centos-7-0.el7.ngx.noarch
rpm -e nginx-1.12.2-1.el7_4.ngx.x86_64
cd /home/shihai
git clone https://github.com/simpl/ngx_devel_kit.git
cd ngx_devel_kit
# checkout到最新发布版本
git checkout v0.3.0
cd /home/shihai
git clone https://github.com/openresty/lua-nginx-module.git
cd lua-nginx-module
# checkout到最新发布版本
git checkout v0.10.5
cd /home/shihai
wget https://ftp.pcre.org/pub/pcre/pcre-8.41.tar.gz
tar -zxvf pcre-8.41.tar.gz
cd /home/shihai
git clone https://github.com/madler/zlib.git
cd zlib
git checkout v1.2.9
cd /home/shihai
git clone https://github.com/openssl/openssl.git
cd openssl
git checkout OpenSSL_1_1_0
cd /home/shihai
wget http://nginx.org/download/nginx-1.11.0.tar.gz
tar -zxvf nginx-1.11.0.tar.gz
cd nginx-1.11.0
# tell nginx's build system where to find LuaJIT 2.0:
export LUAJIT_LIB=/usr/local/luajit/lib
export LUAJIT_INC=/usr/local/luajit/include/luajit-2.0
# Here we assume Nginx is to be installed under /usr/local/nginx/.
./configure --prefix=/etc/nginx --with-http_stub_status_module \
--with-pcre=../pcre-8.41 \
--with-zlib=../zlib \
--with-openssl=../openssl \
--add-module=../ngx_devel_kit \
--add-module=../lua-nginx-module
# Note that you may also want to add `./configure` options which are used in your
# current nginx build.
# You can get usually those options using command nginx -V
# you can change the parallism number 2 below to fit the number of spare CPU cores in your
# machine.
make
make install
编辑/etc/nginx/conf/nginx.conf，添加：
location =/test {
content_by_lua '
ngx.say("hello world")
';
}
执行`/etc/nginx/sbin/nginx`启动nginx。在浏览器访问http://your_ip/test， 显示结果如下所示：
# 添加一个upstream(之前是rpm安装，现在是源码安装，所以配置的负载要重新刷新)
upstream a_test {
server your_ip:9001 weight=1;
server your_ip:9002 weight=1;
}
upstream b_test {
server your_ip:9003;
}
server {
location /ab_test {
content_by_lua '
local a_res, b_res = ngx.location.capture_multi{
{"/a_test", {args = ngx.req.get_uri_args()}},
{"/b_test", {args = ngx.req.get_uri_args()}},
}
ngx.print(a_res.body)
ngx.print(b_res.body)
';
}
location /a_test {
#root /usr/share/nginx/html;
#index index.html index.htm;
proxy_pass http://a_test;
}
location /b_test {
#root /usr/share/nginx/html;
#index index.html index.htm;
proxy_pass http://b_test;
}
}
the end
通过/etc/nginx/sbin/nginx -s reload重新加载nginx。
参考文档
1.ABTest
2.Ngnix安装
5.NDK
