#!/bin/sh
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#
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# This script sets up the HAProxy load balancer initially, configured with
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# no working backend servers. Presumably in a real environment you would
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# do this sort of setup with a real configuration management system. For
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# this demo, however, this shell script will suffice.
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#
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set -e
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# Install HAProxy
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sudo apt-get update
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sudo apt-get install -y haproxy
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# Configure it in a jank way
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cat <<EOF >/tmp/haproxy.cfg
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global
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daemon
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maxconn 256
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defaults
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mode http
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timeout connect 5000ms
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timeout client 50000ms
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timeout server 50000ms
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listen stats
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bind *:9999
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mode http
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stats enable
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stats uri /
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stats refresh 2s
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listen http-in
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bind *:80
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balance roundrobin
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option http-server-close
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EOF
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sudo mv /tmp/haproxy.cfg /etc/haproxy/haproxy.cfg
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# Enable HAProxy
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cat <<EOF >/tmp/haproxy
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ENABLED=1
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EOF
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sudo mv /tmp/haproxy /etc/default/haproxy
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# Start it
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sudo /etc/init.d/haproxy start
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