Using Haproxy and Nginx to build a Web cluster

What is Haproxy?

Haproxy is a free and open source software written in C that provides high availability, load balancing, and TCP and HTTP-based application proxies that can run on most major Linux operating systems.
This experiment uses three servers to build a Web cluster, haproxy as a dispatch server, two Nginx servers as node servers.

Experimental environment

Host	system	IP Address	main software
Haproxy Server	Centos-7-x86_64	192.168.100.100	Haproxy
Nginx server 1	Centos-7-x86_64	192.168.100.110	Nginx
Nginx server 2	Centos-7-x86_64	192.168.100.120	Nginx
Client	Windows 7	192.168.100.30	IE browser

Compiling and installing the Nginx server

• Install the required environment for compilation

• Unzip the installation package, create an administrative user, compile the installation

  tar zxf nginx-1.12.0.tar.gz useradd -M -s /sbin/nologin nginxcd nginx-1.12.0/./configure --prefix=/usr/local/nginx \   //指定安装路径--user=nginx \                //指定管理用户--group=nginx                 //指定管理组make && make install

• Create a test page
  In the Nginx default site Test home page, only need to make some changes to the default home file (and the NGINX2 server first page content can be different), or you may also create your own test home file.
• Start Nginx Service

  ln -s /usr/local/nginx/sbin/nginx /usr/local/sbin/  //创建软连接，方便管理nginx -t                                            //检查配置文件是否正确nginx                                               //启动服务netstat -ntap | grep 80                             //查看服务是否正确开启

• Shutting down the firewall

  systemctl disable firewalld.service systemctl stop firewalld.servicesetenforce 0

• Self-test using Firefox browser
  
  NGINX2 Server Building steps and nginx1 the same way, the only difference is the content of the home page, to be different from nginx1, easy to verify the experiment
  Compile and install Haproxy server install Haproxy software
• Install the compilation environment

  yum -y install pcre-devel bzip2-devel gcc gcc-c++ make

• Compiling the installation

  tar zxf haproxy-1.5.19.tar.gzcd haproxy-1.5.19/make TARGET=linux26     //安装64位系统make install

  Configuring the Haproxy Server
• Create the haproxy/folder under/etc and copy the configuration file to the directory

• Modifying a configuration file
  Delete the following two lines of content

  chroot /usr/share/haproxy  //第8行redispatch                 //第21行

  Modify the Listen section to the following content

  listen  webcluster 0.0.0.0:80    option httpchk GET /index.html     //首页文件名称根据自身情况写入，例如之前创建的我首页文件名称为text.html，则此处写入test.html    balance roundrobin    server inst1 192.168.100.110:80 check inter 2000 fall 3    server inst2 192.168.100.120:80 check inter 2000 fall 3    //节点服务器地址（nginx1，nginx2地址）

  Copy the startup script to/etc/init.d/and add the service to Chkconfig management, creating a soft connection for easy management

  cp haproxy-1.5.19/examples/haproxy.init /etc/init.d/haproxychmod +x haproxychkconfig --add /etc/init.d/haproxyln -s /usr/local/sbin/haproxy /usr/sbin/haproxy

• Start the service

  service haproxy start

• Shutting down the firewall

  systemctl disable firewalld.service systemctl stop firewalld.servicesetenforce 0

  Test your Web Cluster

  In Windows 7 clients use IE browser to access http://192.168.100.100/, several times to rinse new, nginx1 and Nginx2 page rotation display.
  
  

  Log optimization for Haproxy

  The Haproxy log is output to syslog in the system by default. Viewing is not very convenient, in order to better manage the Haproxy log, we need to define the log separately, the method is as follows:

• Modify the options for the log configuration in the Haproxy configuration file (/etc/haproxy/haproxy.cfg), log the Haproxy info and notice logs to a different log file, and modify the following to read as follows:

  log /dev/log    local0 infolog /dev/log    local0 notice  //替换第4、第5行内容

• Modifying the Rsyslog configuration
  For ease of administration, the Haproxy-related configuration is independently defined to haproxy.conf and placed under/etc/rsyslog.d/, and all configuration files under this directory are automatically loaded at rsyslog startup.

  touch /etc/rsyslog.d/haproxy.confvim /etc/rsyslog.d/haproxy.confif ($programname == ‘haproxy‘ and $syslogseverity-text == ‘info‘)then -/var/log/haproxy/haproxy-info.log&~if ($programname == ‘haproxy‘ and $syslogseverity-text == ‘notice‘)then -/var/log/haproxy/haproxy-notice.log&~

• Restart Haproxy service and Rsyslog service

  service haproxy restartsystemctl restart rsyslog.service

• Test log information
  Once again using the client to access the site, you can see the log has been successfully separated.
  

Using Haproxy and Nginx to build a Web cluster