linuxx 发表于 2018-11-11 12:22:14

nginx的读写分离

  一般网站都是用rsync+inotify实现文件同步,而rsync+inotify并不能双向同步,所以这个时候我们就要使用到读写分离。拓扑:nginx:192.168.137.50:80
  后端web:apache1:192.168.137.51:80
  apache2:192.168.137.52:80
  这里我们使用nginx作为反向代理,使用if语句和$request_method模块实现读写分离,
  配置如下:
  server {
  listen       80;
  server_namelocalhost;
  #charset koi8-r;
  #access_loglogs/host.access.logmain;
  location / {
  proxy_pass http://192.168.137.51/;
  if ( $request_method = "PUT"){
  proxy_pass http://192.168.137.52;
  }
  indexindex.html index.htm;
  }
  当$request_method为PUT,我们将请求转发给只做写的web端。
  重启nginx,使用curl测试:
  # curl http://192.168.137.50
  2.syk.com
  # curl http://192.168.137.50
  2.syk.com
  # curl http://192.168.137.50
  2.syk.com
  # curl http://192.168.137.50
  2.syk.com
  读取只被转发到了192.168.137.51端;
  开启192.168.137.52端apache的上传模块:
  vim /etc/httpd/conf/httpd.conf
  在下添加:
  dav on即可
测试:  # curl -T /etc/passwd http://192.168.137.50
  
  
  403 Forbidden
  
  Forbidden
  You don't have permission to access /passwd
  on this server.
  
  Apache/2.2.15 (CentOS) Server at 192.168.137.52 Port 80
  
  出现403,是因为apache目录属组为root,所以这里做修改:
  setfacl -m u:apache:rwx /var/www/html/
  再次测试:
  # curl -T /etc/passwd http://192.168.137.50
  
  
  201 Created
  
  Created
  Resource /passwd has been created.
  
  Apache/2.2.15 (CentOS) Server at 192.168.137.52 Port 80
  
  并且我们可以看到,文件被上传到了192.168.137.52端。

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