Shell script to configure load- balancing with mod-proxy-balancer

lb-manager-client.sh

#! /bin/sh

# Set up a default search path
PATH="/usr/bin:/bin"

CURL=`which curl`
if [ -z "$CURL" ]; then
  echo "curl not found"
  exit 1
fi

target="http://localhost/balancer-manager"

while getopts "t:" opt; do
  case "$opt" in
    t)
      target=$OPTARG
      ;;
  esac
done

shift $(($OPTIND - 1))
action=$1


list_balancers() {
  $CURL -s "${target}" | grep "balancer://" | sed "s/.*balancer:\/\/\(.*\)<\/h3>.*/\1/"
}

list_workers() {
  balancer=$1
  if [ -z "$balancer" ]; then
    echo "Usage: $0 [-s host] [-p port] [-m balancer-manager]  list-workers  balancer_name"
    echo "  balancer_name :    balancer name"
    exit 1
  fi  
  $CURL -s "${target}" | grep "/balancer-manager?b=${balancer}&w" | sed "s/.*href='\(.[^']*\).*/\1/" | sed "s/.*w=\(.*\)&.*/\1/"
}

enable() {
  balancer=$1
  worker=$2
  if [ -z "$balancer" ] || [ -z "$worker" ]; then
    echo "Usage: $0 [-s host] [-p port] [-m balancer-manager]  enable  balancer_name  worker_route"
    echo "  balancer_name :    balancer/cluster name"
    echo "  worker_route  :    worker route e.g.) ajp://192.1.2.3:8009"
    exit 1
  fi
  
  nonce=`$CURL -s "${target}" | grep nonce | grep "${balancer}" | sed "s/.*nonce=\(.*\)['\"].*/\1/" | tail -n 1`
  if [ -z "$nonce" ]; then
    echo "balancer_name ($balancer) not found"
    exit 1
  fi

  echo "Enabling $2 of $1..."
  # Apache 2.2.x
  $CURL -s -o /dev/null "${target}?b=${balancer}&w=${worker}&nonce=${nonce}&dw=Enable&lf=1&ls=0&wr=&rr="

  # newer Apache
  #$CURL -s -o /dev/null -XPOST "${target}?" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=0
  sleep 2
  status
}

disable() {
  balancer=$1
  worker=$2
  if [ -z "$balancer" ] || [ -z "$worker" ]; then
    echo "Usage: $0 [-s host] [-p port] [-m balancer-manager]  disable  balancer_name  worker_route"
    echo "  balancer_name :    balancer/cluster name"
    echo "  worker_route  :    worker route e.g.) ajp://192.1.2.3:8009"
    exit 1
  fi
  
  echo "Disabling $2 of $1..."
  nonce=`$CURL -s "${target}" | grep nonce | grep "${balancer}" | sed "s/.*nonce=\(.*\)['\"].*/\1/" | tail -n 1`
  if [ -z "$nonce" ]; then
    echo "balancer_name ($balancer) not found"
    exit 1
  fi

  # Apache 2.2.x
  $CURL -s -o /dev/null "${target}?b=${balancer}&w=${worker}&nonce=${nonce}&dw=Disable&lf=1&ls=0&wr=&rr="

  # Newer Apache ...
  #$CURL -s -o /dev/null -XPOST "${target}" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=1
  sleep 2
  status
}

status() {
  $CURL -s "${target}" | grep "href" | sed "s/<[^>]*>/ /g"
}

case "$1" in
  list-balancer)
    list_balancers "${@:2}"
	;;
  list-worker)
    list_workers "${@:2}"
	;;
  enable)
    enable "${@:2}"
	;;
  disable)
    disable "${@:2}"
	;;
  status)
    status "${@:2}"
	;;
  *)
    echo "Usage: $0 {list-balancer|list-worker|enable|disable|status}"
	echo ""
	echo "Options: "
	echo "    -t target (e.g. https://app.acme.com/balancer-manager)"
	echo ""
	echo "Commands: "
	echo "    list-balancer"
	echo "    list-worker  balancer-name"
	echo "    enable   balancer_name  worker_route"
	echo "    disable  balancer_name  worker_route"
    exit 1
esac

exit $?

Where did you find the docs for the balancer parameters such as w_status_D ?

In new versions you need to add the referer in the http request. I'm also using IFS to allow the host to be configurable in case one has many balancers for each vhost.

#!/bin/bash

# Set up a default search path
PATH="/usr/bin:/bin"

CURL=`which curl`
if [ -z "$CURL" ]; then
  echo "curl not found"
  exit 1
fi

target="http://127.0.0.1/balancer-manager"
host="127.0.0.1"
while getopts "t:h:" opt; do
  case "$opt" in
    t)
      target=$OPTARG
      ;;
    h)
      host=$OPTARG
      ;;
  esac
done

curlopts="--insecure§-H§Host: $host§-H§Referer: http://$host/balancer-manager"

shift $(($OPTIND - 1))
action=$1


list_balancers() {
  OFS=$IFS
  IFS="§"
  $CURL $curlopts -s "${target}" | grep "balancer://" | sed "s/.*balancer:\/\/\(.*\)<\/a>.*/\1/"
  IFS=$OFS
}

list_workers() {
  balancer=$1
  if [ -z "$balancer" ]; then
    echo "Usage: $0 [-s host] [-p port] [-m balancer-manager]  list-workers  balancer_name"
    echo "  balancer_name :    balancer name"
    exit 1
  fi

  OFS=$IFS
  IFS="§"
  OUT=$($CURL $curlopts -s "${target}")
  IFS=$OFS

  echo "${OUT}" | grep "/balancer-manager?b=${balancer}&amp;w" | sed "s/.*href='\(.[^']*\).*/\1/" | sed "s/.*w=\(.*\)&.*/\1/"
}

enable() {
  balancer=$1
  worker=$2
  if [ -z "$balancer" ] || [ -z "$worker" ]; then
    echo "Usage: $0 [-s host] [-p port] [-m balancer-manager]  enable  balancer_name  worker_route"
    echo "  balancer_name :    balancer/cluster name"
    echo "  worker_route  :    worker route e.g.) ajp://192.1.2.3:8009"
    exit 1
  fi

  OFS=$IFS
  IFS="§"

  nonce=`$CURL $curlopts -s "${target}" | grep nonce | grep "${balancer}" | sed "s/.*nonce=\(.*\)['\"].*/\1/" | tail -n 1`
  if [ -z "$nonce" ]; then
    echo "balancer_name ($balancer) not found"
    exit 1
  fi

  echo "Enabling $2 of $1..."
  # Apache 2.2.x
  #$CURL $curlopts -s -o /dev/null "${target}?b=${balancer}&w=${worker}&nonce=${nonce}&dw=Enable&lf=1&ls=0&wr=&rr="

  # newer Apache
  $CURL $curlopts -s -o /dev/null -XPOST "${target}?" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=0

  IFS=$OFS

  sleep 0.5
  status
}

disable() {
  balancer=$1
  worker=$2
  if [ -z "$balancer" ] || [ -z "$worker" ]; then
    echo "Usage: $0 [-s host] [-p port] [-m balancer-manager]  disable  balancer_name  worker_route"
    echo "  balancer_name :    balancer/cluster name"
    echo "  worker_route  :    worker route e.g.) ajp://192.1.2.3:8009"
    exit 1
  fi

  OFS=$IFS
  IFS="§"

  echo "Disabling $2 of $1..."
  nonce=`$CURL $curlopts -s "${target}" | grep nonce | grep "${balancer}" | sed "s/.*nonce=\(.*\)['\"].*/\1/" | tail -n 1`
  if [ -z "$nonce" ]; then
    echo "balancer_name ($balancer) not found"
    exit 1
  fi

  # Apache 2.2.x
  #$CURL $curlopts -s -o /dev/null "${target}?b=${balancer}&w=${worker}&nonce=${nonce}&dw=Disable&lf=1&ls=0&wr=&rr="

  # Newer Apache ...
  $CURL $curlopts -s -o /dev/null -XPOST "${target}" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=1

  IFS=$OFS

  sleep 0.5
  status
}

status() {
  OFS=$IFS
  IFS="§"

  $CURL $curlopts -s "${target}" | grep "href" | sed "s/<[^>]*>/ /g"

  IFS=$OFS
}

case "$1" in
  list-balancer)
    list_balancers "${@:2}"
        ;;
  list-worker)
    list_workers "${@:2}"
        ;;
  enable)
    enable "${@:2}"
        ;;
  disable)
    disable "${@:2}"
        ;;
  status)
    status "${@:2}"
        ;;
  *)
    echo "Usage: $0 {list-balancer|list-worker|enable|disable|status}"
        echo ""
        echo "Options: "
        echo "    -t target (e.g. https://app.acme.com/balancer-manager)"
        echo ""
        echo "Commands: "
        echo "    list-balancer"
        echo "    list-worker  balancer-name"
        echo "    enable   balancer_name  worker_route"
        echo "    disable  balancer_name  worker_route"
    exit 1
esac

exit $?

Forked and added following changes:

• "nonce" is now picked correctly even if balancers have names, consisting of one another : e.g. httpbalancer, euhttpbalancer
• CURL is constructed based on HTTPD version. if HTTPD version cannot be determined - newer apache (2.4.X) implied.