In this post, which is taken from my personal blog, I will demonstrate how we can install HAProxy from source code. According to Wikipedia, HAProxy was written and still maintained by Willy Tarreau since 2000. HAProxy is free open source software (FOSS), that provides a high availability load balancer and proxy server for TCP (Transmission Control Protocol) and HTTP (Hypertext Transfer Protocol) based applications that spreads requests across multiple servers. It is written in C language and thus the reputation for being fast and efficient.
If you are curious, this HAProxy Page offers more details about its features.
In this guide , we will be installing the latest stable version of 1.8 (as of May 09, 2018). the current HAProxy available under RHEL is
1.8.8 on Debian/Ubuntu. before taking the next step, make sure you have
# CentOS RHEL: sudo yum -y install make gcc perl pcre-devel zlib-devel # Debian/Ubuntu: sudo apt install make gcc perl pcre-devel zlib-devel
Enable IP forwarding and binding to non-local IP addresses:
# echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf # echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf # sysctl -p net.ipv4.ip_forward = 1 net.ipv4.ip_nonlocal_bind = 1
Download the source code:
Extract the file and change directory:
tar xvzf haproxy-1.8.8.tar.gz && cd haproxy-1.8.8
Compile the program:
make TARGET=linux2628 USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1
This is the list of TARGETs:
- linux22 for Linux 2.2
- linux24 for Linux 2.4 and above (default)
- linux24e for Linux 2.4 with support for a working epoll (> 0.21)
- linux26 for Linux 2.6 and above
- linux2628 for Linux 2.6.28, 3.x, and above (enables splice and tproxy)
- solaris for Solaris 8 or 10 (others untested)
- freebsd for FreeBSD 5 to 10 (others untested)
- netbsd for NetBSD
- osx for Mac OS/X
- openbsd for OpenBSD 5.7 and above
- aix51 for AIX 5.1
- aix52 for AIX 5.2
- cygwin for Cygwin
- haiku for Haiku
- generic for any other OS or version.
- custom to manually adjust every setting
You can also compile the program with following options:
USE_PCRE=1 to use libpcre, in whatever form is available on your system (shared or static).
USE_ZLIP=1 to use zlib compression Library.
USE_OPENSSL=1 to add native support for SSL using the GNU makefile.
sudo make install
With that, we should now have the chosen HAProxy version installed. now we need to setup HAProxy.
Adding HAProxy user:
id -u haproxy &> /dev/null || useradd -s /usr/sbin/nologin -r haproxy
Copy HAProxy binary located in the extracted HAProxy directory to
cp haproxy /usr/sbin/
Create Manual page:
wget -qO - https://raw.githubusercontent.com/horms/haproxy/master/doc/configuration.txt | gzip -c > /usr/share/doc/haproxy/configuration.txt.gz
Create Systemd service script to manage HAProxy, use the following at your discretion:
sudo wget https://gist.githubusercontent.com/tmidi/1699a358533ae876513e2887fec6fbe2/raw/6c07ce39adc56c731d2bbeb88b90d8bbc636f3ea/haproxy.service -O /lib/systemd/system/haproxy.service
/lib/systemd/system/haproxy.service with the following content:
[Unit] Description=HAProxy Load Balancer Documentation=man:haproxy(1) Documentation=file:/usr/share/doc/haproxy/configuration.txt.gz # allows us to do millisecond level restarts without triggering alert in Systemd StartLimitInterval=0 StartLimitBurst=0 After=network.target syslog.service Wants=syslog.service [Service] Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid" # EXTRAOPTS and RELOADOPS come from this default file EnvironmentFile=-/etc/default/haproxy ExecStartPre=/usr/sbin/haproxy -f $CONFIG -c -q ExecStart=/usr/sbin/haproxy -W -f $CONFIG -p $PIDFILE $EXTRAOPTS ExecReload=/usr/sbin/haproxy -f $CONFIG -c -q $EXTRAOPTS $RELOADOPTS ExecReload=/bin/kill -USR2 $MAINPID KillMode=mixed Restart=always Type=forking [Install] WantedBy=multi-user.target
Enable and start
systemctl enablle haproxy.service
systemctl start haproxy.service
This conclude conclude HAProxy installation steps.This guide however covers only the installation steps, in future post I will demonstrate how to configure HAProxy to load balance three backend web servers while using sticky session and SSL Pass-through.