Using HAProxy + Nginx to build a Web cluster

HAProxy is currently a popular cluster scheduling tool, similar cluster scheduling tool, compared with LVS, LVS performance is the best, but the building is relatively complex, Nginx upstream module support cluster function, but the cluster node health Check function is not strong, performance is not HAProxy good.

System environment

Host	IP Address	main software
HAProxy Server	192.168.100.200	Haproxy-1.5.19.tar.gz
Nginx server 1	192.168.100.201	Nginx-1.12.0.tar.gz
Nginx server 2	192.168.100.202	Nginx-1.12.0.tar.gz

Start deploying an Nginx server

• First, compile and install the Nginx server

  yum install -y pcre-devel zlib-devel gcc gcc-c++ make useradd -M -s /sbin/nologin nginxtar zxvf nginx-1.12.0.tar.gz -C /optcd /opt/nginx-1.12.0/./configure --prefix=/usr/local/nginx --user=nginx --group=nginxmake && make install

• The default information after installation is as follows.
  -Default installation directory:/usr/local/nginx
  -Default log:/usr/local/nginx/logs/
  -Default listening port: 80
  -Default Web directory:/usr/local/nginx/html

• Next, set up the test page and start the Nginx service

  echo "

• For convenience, the website is accessed directly using an IP address. The client accesses the http://192.168.100.201/test.html for testing.

• The process of building Nginx server 2 and the installation steps of Nginx server 1 are the same, the different place is to build the test page.

  echo "

Deploying HAProxy Servers

• Compiling and installing HAProxy

  yum install pcre-devel bzip2-devel gcc gcc-c++ make -ytar zxvf haproxy-1.5.19.tar.gz -C /optcd haproxy-1.5.19/make TARGET=linnux26    ##64位系统make install

• HAProxy Server Configuration

  mkdir /etc/haproxycp examples/haproxy.cfg /etc/haproxy/    ##复制haproxy.cfg 文件复制到配置文件目录

• Editing a configuration file

  vim /etc/haproxy/haproxy.cfgchroot /usr/share/haproxy  ##删除两条语句及所有 listen 项目redispatch##添加listen  webcluster 0.0.0.0:80    option httpchk GET /test.html    balance roundrobin    server inst1 192.168.100.201:80 check inter 2000 fall 3    server inst2 192.168.100.202:80 check inter 2000 fall 3

• Copy the self-startup script and start the service

  cp /opt/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/haproxyservice haproxy start

• Windows Client test (can see access to HAProxy server address, polling to access two Nginx servers)
  
  

HAProxy Log Definition separation

• HAProxy logs are output to system syslog by default, and viewing is very inconvenient. For better management of logs, you can log HAProxy info access logs and notice error logs to different log files.

• Modifying a configuration file

  vim /etc/haproxy/haproxy.cfg##修改为下面的行global    log /dev/log    local0 info    log /dev/log    local0 notice

• Modify the Rsyslog configuration and restart the Rsylog service

  touch /etc/rsyslog.d/haproxy.confvim /etc/rsyslog.d/haproxy.conf##添加下面的脚本if ($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&~

• Access the HAProxy server through the client and view the logs

  cd /var/log/haproxy/cat haproxy-info.log

Using HAProxy + Nginx to build a Web cluster