建立AB测试环境（第一部分）

2 年 ago

韵, 科

3 minutes

我想尝试做的事情

我希望在Nginx上进行负载均衡，启动WEB＃1 / WEB＃2，并使用fluentd将Apache日志传输到日志服务器上，以便实时查看其内容，并创建AB测试环境的基础。

動機就是一個人進行行動或追求目標的原因或力量。

我经常看到一些以冗余配置方式运作的服务在WEB#1 / WEB#2上，所以我觉得通过确认自己发布的服务是否具有真正的价值，我可以提出技术建议。

搭建环境

像往常一样，使用Vagrant来建立虚拟环境。

  config.vm.define "nginx" do |node|
      node.vm.box = "centos7"
      node.vm.network "forwarded_port", guest: 80, host: 8080
      node.vm.network :private_network, ip: "192.168.33.10", virtualbox__intnet: "intnet"
  end
  config.vm.define "web1" do |node|
      node.vm.box = "centos7"
      #node.vm.network :forwarded_port, id: "ssh", guest: 22, host: 2222
      #node.vm.network "forwarded_port", guest: 80, host: 8080
      node.vm.network :private_network, ip: "192.168.33.100", virtualbox__intnet: "intnet"
  end
  config.vm.define "web2" do |node|
      node.vm.box = "centos7"
      node.vm.network "forwarded_port", guest: 80, host: 8082
      node.vm.network :private_network, ip: "192.168.33.102", virtualbox__intnet: "intnet"
  end

安装Nginx

请参考以下链接，其中包含适用于 CentOS 的设置：
https://www.nginx.com/resources/wiki/start/topics/tutorials/install/

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1

$ sudo yum -y 安装nginx
$ nginx -v
安装的版本为nginx version: nginx/1.12.0

启动Nginx

$ sudo systemctl start nginx
$ sudo systemctl status nginx
nginx.service - nginx - high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled)
   Active: active (running) since 火 2017-05-16 14:02:29 UTC; 6s ago
     Docs: http://nginx.org/en/docs/
  Process: 21017 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)
  Process: 21015 ExecStartPre=/usr/sbin/nginx -t -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)
 Main PID: 21019 (nginx)
   CGroup: /system.slice/nginx.service
           ├─21019 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
           └─21020 nginx: worker process

 5月 16 14:02:28 localhost.localdomain systemd[1]: Starting nginx - high performance web server...
 5月 16 14:02:28 localhost.localdomain nginx[21015]: nginx: the configuration file /etc/nginx/nginx.conf... ok
 5月 16 14:02:28 localhost.localdomain nginx[21015]: nginx: configuration file /etc/nginx/nginx.conf tes...ful
 5月 16 14:02:28 localhost.localdomain systemd[1]: PID 20976 read from file /run/nginx.pid does not exist.
 5月 16 14:02:29 localhost.localdomain systemd[1]: Started nginx - high performance web server.
Hint: Some lines were ellipsized, use -l to show in full.

确认 nginx 是否正常工作

http://localhost:8080

安装 Apache。

$ sudo systemctl stop firewalld
$ sudo ssytemctl disable firewalld
$ sudo yum install httpd
$ sudo systemctl status httpd
$ sudo systemctl start httpd
$ sudo systemctl status httpd
$ sudo systemctl enable httpd

$ sudo echo "<html><body>web1 running ...</body></html>" > /var/www/html/index.html 
$ curl localhost
<html><body>web1 running ...</body></html>

$ sudo echo "<html><body>web2 running ...</body></html>" > /var/www/html/index.html 
$ curl localhost
<html><body>web2 running ...</body></html>

负载均衡设置

将web#1或web#2配置成可以由nginx进行负载均衡的设置。

upstream myapp1 {
    server 192.168.33.100;
    server 192.168.33.102;
}

server {
    listen       80;
    location / {
        set $do_not_cache 0;
        proxy_pass http://myapp1;
    }
}

我有点困扰。在上述文件夹中有一个 default.conf 文件，当我创建了 server.conf 文件后，无法参考 default.conf 的设置并进行负载均衡的确认。

$ sudo systemctl restart nginx

确认动作

http://本地主机:8080