{"id":2207,"date":"2016-07-13T14:19:26","date_gmt":"2016-07-13T18:19:26","guid":{"rendered":"https:\/\/www.globo.tech\/learning-center\/?p=2207"},"modified":"2017-11-24T17:57:08","modified_gmt":"2017-11-24T22:57:08","slug":"install-haproxy-centos-7","status":"publish","type":"post","link":"https:\/\/www.globo.tech\/learning-center\/install-haproxy-centos-7\/","title":{"rendered":"How to install HAProxy on CentOS 7"},"content":{"rendered":"

How to install HAProxy on CentOS 7<\/h1>\n

HAProxy is a free HTTP\/TCP high availability load balancer and proxy server. It spreads requests among multiple servers to mitigate issues resulting from single server failure. It is used by many well known highly trafficked websites such as Github, Stack Overflow and Reddit to improve uptime statistics.<\/p>\n

Getting Started<\/h2>\n

In order to install HAProxy, you will need the following:
\n\u2022 1 Node (Cloud Server<\/b><\/a> or Dedicated Server<\/b><\/a>) running a clean installation of CentOS 7.
\n\u2022 All commands should be run as the root user<\/p>\n

Tutorial<\/h2>\n

Make sure that your CentOS 7 distribution is fully up to date.<\/p>\n

yum -y update<\/code><\/p>\n

You can install HAProxy from the default repositories.<\/p>\n

yum -y install haproxy<\/code><\/p>\n

Open the configuration file in a text editor.<\/p>\n

nano \/etc\/haproxy\/haproxy.conf<\/code><\/p>\n

The following is an example of a basic configuration for HTTP and HTTPS on two backend servers which are using the addresses 192.168.1.10 and 192.168.1.11. The “stats page” section is enabled in this example, which will allow you to better monitor the status of each individual proxy port.<\/p>\n

global
\n log 127.0.0.1 local2
\n chroot \/var\/lib\/haproxy
\n pidfile \/var\/run\/haproxy.pid
\n maxconn 16384
\n user haproxy
\n group haproxy
\n daemon
\n # turn on stats unix socket
\n stats socket \/var\/run\/haproxy.cmd<\/code><\/p>\n

defaults
\n mode http
\n log global
\n option httplog
\n option dontlognull
\n option httpclose
\n option forwardfor except 127.0.0.0\/8
\n option redispatch
\n retries 3
\n timeout http-request 10s
\n timeout queue 1m
\n timeout connect 10s
\n timeout client 45s
\n timeout server 45s
\n timeout check 10s
\n maxconn 16384<\/code><\/p>\n

listen stats :9000
\n mode http
\n stats enable
\n stats uri \/haproxy
\n stats realm HAProxy\\ Statistics
\n stats auth haproxy:password
\n stats admin if TRUE<\/code><\/p>\n

listen http :80
\n balance leastconn
\n option http-server-close
\n option forwardfor
\n server web1 192.168.1.10:80 check inter 3000 rise 2 fall 3
\n server web2 192.168.1.11:80 check inter 3000 rise 2 fall 3<\/code><\/p>\n

listen https :443
\n balance leastconn
\n option http-server-close
\n option forwardfor
\n server web1 192.168.1.10:443 check inter 3000 rise 2 fall 3
\n server web2 192.168.1.11:443 check inter 3000 rise 2 fall 3<\/code><\/p>\n

With the basic configuration above, you will be able to send traffic through ports 80 and 443 of both back-end web servers.<\/p>\n

It will be necessary to restart HAProxy instance in order for it to reflect the changes made to the configuration file.<\/p>\n

service haproxy restart<\/code><\/p>\n

After restarting, visit the statistics URL to confirm that ports 80 and 443 are opened and traffic can flow through. Navigate to your proxy IP on port 9000 (for example, http:\/\/67.215.1.1:9000).<\/p>\n

Once you’ve ensured that HAproxy is operating as intended, set it to start automatically on boot:<\/p>\n

systemctl enable haproxy<\/code><\/p>\n

If you wish to monitor your proxy status from the command line, you can install and open hatop.<\/p>\n

wget http:\/\/hatop.googlecode.com\/files\/hatop-0.7.7.tar.gz
\ntar xvf hatop-0.7.7.tar.gz
\ncd hatop-0.7.7
\ninstall -m 755 bin\/hatop \/usr\/local\/bin
\nhatop -s \/var\/run\/haproxy.cmd<\/code><\/p>\n

To avoid having to enter the -s parameter when calling hatop, insert the following line in your ~\/.bashrc file:<\/p>\n

echo \"alias hatop='hatop -s \/var\/run\/haproxy.cmd'\" >> ~\/.bashrc<\/code><\/p>\n

Conclusion<\/h2>\n

Now that HAProxy is successfully installed and configured, you should notice improved performance and responsiveness in your web application. With careful monitoring and experimentation, you may discover ways to further adjust the load balancing in response to changed conditions in the future. If this guide was helpful to you, kindly share it with others who may also be interested. <\/p>\n","protected":false},"excerpt":{"rendered":"

How to install HAProxy on CentOS 7 HAProxy is a free HTTP\/TCP high availability load balancer and proxy server. It spreads requests among multiple servers to mitigate issues resulting from single server failure. It is used by many well known highly trafficked websites such as Github, Stack Overflow and Reddit to improve uptime statistics. Getting<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[70],"tags":[],"class_list":["post-2207","post","type-post","status-publish","format-standard","hentry","category-web-hosting","operating_system-centos-7"],"yoast_head":"\nHow to install HAProxy on CentOS 7 - Globo.Tech<\/title>\n<meta name=\"description\" content=\"This tutorial will show you how to install HAProxy on your CentOS 7 server. 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