Disables other controller haproxy backends on osp ctlplane

disable-haproxy-backends.sh

#!/bin/bash
set -e
# Before running this script it would be best to disable haproxy on the other nodes
# via: for i in controller-1 controller-2; do pcs resource ban haproxy-bundle $i; done
# To clear the bans: for i in controller-1 controller-2; do pcs resource clear haproxy-bundle $i; done

# Run this script as root on the single controller you want to stay active
CONF="/var/lib/config-data/puppet-generated/haproxy/etc/haproxy/haproxy.cfg"
HOST=$(hostname)
# Enable admin access to the haproxy stat socket
sed -i '/stats.*socket.*user$/s/user/admin/' $CONF
pcs resource restart --wait=30 haproxy-bundle

function get_servers() {
  local stanza
  stanza=$1
  text=$(sed -n "/^listen $stanza/,/^$/p" $CONF| grep -e "^\s\+server" | awk '{ print $2}')
  echo $text
}

# For each stanza put the other nodes in maintenance mode
STANZAS=$(grep -e '^listen\s\+\(\S\+\)$' $CONF | awk '{print $2}')
for SERVICE in $STANZAS; do
  output=$(get_servers $SERVICE)
  for i in $output; do
    if [[ "$i" =~ "$HOST" ]]; then
      echo -n ""
    else
      echo "Disabling $SERVICE/$i"
      echo "disable server $SERVICE/$i" | nc -U /var/lib/haproxy/stats
    fi
  done
done

echo "Verifying state of backends in maintenance mode"
echo "show info;show stat" | nc -U /var/lib/haproxy/stats |grep MAINT

echo "In order to reenable all backends just run 'pcs resource restart haproxy-bundle'"