node-stop

#!/bin/bash

# Use this script to stop one or more Akka cluster nodes. The command line parameters must be from 1 to 9.
# pkill and kill SIGTERM always did hard kill -9 (SIGKILL) process terminations so switched to Akka Management via curl.

usage() {
  echo "Usage: $0 nodes - Stop cluster nodes, node numbers must be 1 through 9." ; exit 1
}

stopNode() {
  node=$1
  if [[ $OSTYPE == "cygwin"* ]]; then
    stopNodeCygwin "$node"
  else
    stopNodeLinux "$node"
  fi
}

stopNodeLinux() {
  node=$1
  port="255"$node
  echo "Stop node $node on port $port"

  if hash pkill 2>/dev/null; then
    pkill -f "$(basename "$jarFilename") $port"
  else
    echo "Error: pkill command required. For cygwin please intatll the procps-ng package."
  fi
}

stopNodeCygwin() {
  node=$1
  mgmtPort="855"$node
  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 "Stop node $node on port $nodePort via Akka management port $mgmtPort"
    curl --silent -X DELETE http://localhost:"$mgmtPort"/cluster/members/cluster@"$localhostName":"$nodePort" --output /dev/null
  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

scriptPath=$(dirname "$0")
jarFilename=$(find "$scriptPath"/target -name '*allinone.jar*')

while [[ $# -gt 0 ]]; do
  node=$1
  shift

  if [[ $node =~ ^[1-9]$ ]] ; then
    getLocalhostName
    stopNode "$node"
  else
    echo "Cluster node number $node is invalid. The node number must be 1 through 9."
    usage
  fi
done