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#HAProxy installation for a cluster

sudo yum install haproxy

vim /etc/haproxy/haproxy.conf

#https://github.com/apache/couchdb/blob/master/rel/haproxy.cfg

https://dev.to/tmidi/getting-started-with-haproxy-install-from-code-source-5c4g

CentOS RHEL:

sudo yum -y install make gcc perl pcre-devel zlib-devel

Download the source code:

wget https://www.haproxy.org/download/1.8/src/haproxy-1.8.8.tar.gz

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

Install HAProxy:

sudo make install

With that, we should now have the chosen HAProxy version installed. now we need to setup HAProxy. Setup:

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 /usr/sbin/:

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

or create /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 haproxy.service:

systemctl enablle haproxy.service

systemctl start haproxy.service