This blog post will cover the instructions on how to install HAProxy and configure it on RHEL 7 (Red Hat Enterprise Linux).
Before we dive into the installation and configuration, first we will have to compile it.
In order to compile HAProxy we will require the following prerequisites:
yum install gcc openssl-devel readline-devel systemd-devel make pcre-devel
Once the prerequisites are installed, we will download the latest stable Lua and HAProxy:
curl https://www.lua.org/ftp/lua-5.4.2.tar.gz > lua-5.4.2.tar.gz
curl http://www.haproxy.org/download/2.3/src/haproxy-2.3.2.tar.gz > haproxy-2.3.2.tar.gz
Follow the link to view the readme.
Next we'll extract, then compile – and install:
Lua
tar xvf lua-5.4.2.tar.gz
cd lua-5.4.2
make INSTALL_TOP=/opt/lua-5.4.2 linux install
HAProxy
cd ..
tar xvf haproxy-2.3.2.tar.gz
cd haproxy-2.3.2
make USE_NS=1 \
USE_TFO=1 \
USE_OPENSSL=1 \
USE_ZLIB=1 \
USE_LUA=1 \
USE_PCRE=1 \
USE_SYSTEMD=1 \
USE_LIBCRYPT=1 \
USE_THREAD=1 \
TARGET=linux-glibc \
LUA_INC=/opt/lua-5.4.2/include \
LUA_LIB=/opt/lua-5.4.2/lib
We will also create an unpreviliged user and group for HAProxy.
groupadd -g 188 haproxy
useradd -g 188 -u 188 -d /var/lib/haproxy -s /sbin/nologin -c haproxy haproxy
In order to control how HAProxy will be started, stopped, restarted, reloaded or monitored, using your text editor of choice, a SystemD Unit file /etc/systemd/system/haproxy.service will be created
[Unit]
Description=HAProxy 2.3.2
After=syslog.target network.target
[Service]
Type=notify
EnvironmentFile=/etc/sysconfig/haproxy-2.3.2
ExecStart=/opt/haproxy-2.3.2/sbin/haproxy -f $CONFIG_FILE -p $PID_FILE $CLI_OPTIONS
ExecReload=/bin/kill -USR2 $MAINPID
ExecStop=/bin/kill -USR1 $MAINPID
[Install]
WantedBy=multi-user.target
To set environment variables required by HAProxy and to notify SystemD when its started, a SystemD Environment file /etc/sysconfig/haproxy-2.3.2 will also be created.
# Command line options to pass to HAProxy at startup
# The default is:
#CLI_OPTIONS="-Ws"
CLI_OPTIONS="-Ws"
# Specify an alternate configuration file. The default is:
#CONFIG_FILE=/etc/haproxy/haproxy-2.3.2.conf
CONFIG_FILE=/etc/haproxy/haproxy.cfg
# File used to track process IDs. The default is:
#PID_FILE=/var/run/haproxy-2.3.2.pid
PID_FILE=/var/run/haproxy.pid
To load these configuration changes, SystemD will be reloaded:
systemctl daemon-reload
Unless it has been created already, the directory for the configuration will be created mkdir /etc/haproxy with the corresponding user and group ownership.
The final step for HAProxy installation and configuration: enable it to run at boot.
systemctl enable haproxy
