node-down

#!/bin/bash

# Use this script to down one or more Akka cluster nodes. The command line parameters must be from 1 to 9.
# Nodes are downed via a management node. The management node defaults to 1. The management node can be
# changed using the via option - options -v or --via.

# Example - from management node 2, down node 5.
# ./akka node down 2 5

# Example - from default management node 1, down nodes 6 8 9.
# ./akka node down 6 8 9

# Example - from management node 6, down node 6.
# ./akka node down --via 6 6

# Example - from default management node 1, down nodes 6 8 9. And node 6 8 9 down themselves.
# ./akka node down 6 8 9 -v 6 6 -v 8 8 -v 9 9

usage() {
  echo "Usage: $0 [-v|--via M] N... - Down cluster nodes N... via mgmt node M, 6 8 9 -v 6 6 -v 8 8 -v 9 9. M default is 1." ; exit 1
}

downNode() {
  mgmtPort="855"$1
  node=$2
  nodePort="255"$node

  httpStatus=$(curl --write-out %{http_code} --max-time 5 --silent --output /dev/null http://localhost:"$mgmtPort"/cluster/members)

  if [[ $httpStatus == 200 ]] ; then
    echo "Down node $node on $localhostName:$nodePort via Akka management $localhostName:$mgmtPort"
    curl --silent -X PUT -F "operation=down" http://localhost:"$mgmtPort"/cluster/members/cluster@"$localhostName":"$nodePort" --output /dev/null
  else
    echo "Management port $mgmtPort, HTTP response $httpStatus"
  fi
}

getLocalhostName() {
  if hash pfctl 2>/dev/null; then
    ifconfig | grep "127.0.0.2" > /dev/null
    localhost2=$?
  elif hash ip 2>/dev/null; then
    ip address | grep "127.0.0.2" > /dev/null
    localhost2=$?
  else
    localhost2=1
  fi
  if [ $localhost2 -eq 0 ] ; then
    export localhostName="127.0.0.2"
  else
    export localhostName="127.0.0.1"
  fi
}

[ $# -eq 0 ] && usage

via=1

while [[ $# -gt 0 ]]; do
    arg=$1
    shift
    if [ "$arg" = "-v" ] || [ "$arg" = "--via" ]; then
        v=$1
        shift
        if [[ $v =~ ^[1-9]$ ]] ; then
            via=$v
        else
            echo "Via node number '$v' invalid. Must be 1-9."
            usage
        fi
    elif [[ $arg =~ ^[1-9]$ ]] ; then
        getLocalhostName
        downNode "$via" "$arg"
    else
        echo "Argument '$arg' is invalid."
        usage
    fi
done