Apache HTTPD balancer-manager control script

apache-balancer.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

server="localhost"
port="80"
manager="balancer-manager"

while getopts "s:p:m:" opt; do
  case "$opt" in
    s)
      server=$OPTARG
      ;;
    p)
      port=$OPTARG
      ;;
    m)
      manager=$OPTARG
      ;;  
  esac
done

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


list_balancers() {
  $CURL -s "http://${server}:${port}/${manager}" | grep "balancer://" | sed "s/.*balancer:\/\/\(.*\)<\/a>.*/\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  
  $CURL -s "http://${server}:${port}/${manager}" | 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=`$CURL -s "http://${server}:${port}/${manager}" | 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 -XPOST "http://${server}:${port}/${manager}?" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d dw=Enable
  $CURL -s -o /dev/null -XPOST "http://${server}:${port}/${manager}?" -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 "http://${server}:${port}/${manager}" | grep nonce | grep "${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
  #$CURL -s -o /dev/null -XPOST "http://${server}:${port}/${manager}?" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d dw=Disable
  $CURL -s -o /dev/null -XPOST "http://${server}:${port}/${manager}?" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=1
  sleep 2
  status
}

status() {
  $CURL -s "http://${server}:${port}/${manager}" | 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 "    -s server"
	echo "    -p port"
	echo "    -m balancer-manager-context-path"
	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 $?

---
 apache-balancer.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apache-balancer.sh b/apache-balancer.sh
index eb6d199..c195161 100644
--- a/apache-balancer.sh
+++ b/apache-balancer.sh
@@ -42,7 +42,7 @@ list_workers() {
     echo "  balancer_name :    balancer name"
     exit 1
   fi
-  $CURL -s "http://${server}:${port}/${manager}" | grep "/balancer-manager?b=${balancer}&w" | sed "s/.*href='\(.[^']*\).*/\1/" | sed "s/.*w=\(.*\)&.*/\1/"
+  $CURL -s "http://${server}:${port}/${manager}" | grep "/${manager}?b=${balancer}&w" | sed "s/.*href='\(.[^']*\).*/\1/" | sed "s/.*w=\(.*\)&.*/\1/"
 }

 enable() {
-- 
2.1.4

curl-7.19.7-37.el6_5.3.x86_64; httpd-2.2.15-69.el6.x86_64

disable and enable script functions, for us, required a different url as it was not a POST but a GET method and, w_status_D was changed in status_D:

disable: $CURL -s -o /dev/null -G "http://${server}:${port}/${manager}?b=${balancer}" -d w="${worker}" -d nonce="${nonce}" -d status_D=1

PS1: enable: "0" instead of "1".
PS2: -X GET is the default
PS3: it hasn't been necessary to specify the whole parameters string used in the form (ls, lf, rr, etc...) to disable or enable the workers.

curl version 7.64.0-4; apache2 version 2.4.38-3

POST requests still work for me.
BUT: Since the last apache update you have to specify a referer inside your request! Otherwise it may be that you can't disable the loadbalance member.

add this part: -H "Referer: ${proto}://${vhost}:${port}/${manager}?"

Example (Disable Member):
$CURL -s -o /dev/null -XPOST -H "Referer: ${proto}://${vhost}:${port}/${manager}?" "${proto}://${vhost}:${port}/${manager}?" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=1

Hi,
I also use balancer-manager but after upgrading to httpd2.4.41 the curl is not working anymore, nothing changes on balancer page.
Anyone had this issue?

Hi,
I also use balancer-manager but after upgrading to httpd2.4.41 the curl is not working anymore, nothing changes on balancer page.
Anyone had this issue?

Hi,
I am having this issue. I had a working bash script that use to be able to manipulate the balance manager members. But, some upgrade seems to have broken this functionality.

Hello.
Same issue here, but it works when adding the referer header :
$CURL -s -o /dev/null -XPOST "http://${server}:${port}/${manager}?" -H "Referer: http://${server}:${port}/${manager}?b=${balancer}&w=${worker}&nonce=${nonce}" -d b="${balancer}" -d w="${worker}" -d nonce="${nonce}" -d w_status_D=1