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Add a node to a cluster :

#!/bin/bash

#in order to work the following line must be present in haproxy.cfg in main section
#stats  socket /var/lib/haproxy/stats mode 600 level admin

BACK="BCK_PROD_WEB"
FRONT=$1
echo "enable server $BACK/$FRONT" | socat stdio /var/lib/haproxy/stats
echo "show stat" | socat stdio /var/lib/haproxy/stats |grep $FRONT

remove a node to a cluster :

#!/bin/bash

#in order to work the following line must be present in haproxy.cfg in main section
#stats  socket /var/lib/haproxy/stats mode 600 level admin

BACK="BCK_PROD_WEB"
FRONT=$1
echo "disable server $BACK/$FRONT" | socat stdio /var/lib/haproxy/stats
echo "show stat" | socat stdio /var/lib/haproxy/stats |grep $FRONT