Trivial bash Script to restart services in AWS

Too many aws servers? Been there and I hate it. Following is a simple script that I use to restart services running on EC2 instances. I am using AWS Cli to get the ip address based on tag names and then ssh into the box and to the command. Note that the tag names are the same as service names in my case.

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#!/bin/bash   set -e   function usage {   echo >&2 "Usage: $0 [ -e environment -n service_name -a action ]"   exit 1 }   while getopts ":n:e:a:" FLAG; do   case $FLAG in     n) NAME=${OPTARG};;  e) ENV=${OPTARG};;  a) ACTION=${OPTARG};;  [?]) usage;;   esac done   if [[ -z $NAME || -z $ENV || -z $ACTION ]]; then   usage fi   for fid in $(aws ec2 describe-instances --filters "Name=tag:ServerEnv,Values=${ENV}" "Name=tag:SubSystem,Values=${NAME}" --query 'Reservations[*].Instances[*].PrivateIpAddress' --output text) do  ssh -n $fid "sudo ${ACTION} ${NAME}; exit;" done

RabbitMQ Upgrade - Bash Script

An easy to read, trivial bash script for upgrading RabbitMQ service.

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function check_rmq_version {     rmq_version=$(sudo rabbitmqctl status | grep "rabbit," | cut -d',' -f3 | cut -d'}' -f1 | tr -d '"')     echo && echo "    Version = $rmq_version" && echo }   function stop_rmq {     echo "Stopping RabbitMQ..."     sudo service rabbitmq-server stop }   function kill_erlang {     echo "Killing stray RMQ/erlang processes..."     #pids=$(ps -fe | grep erlang | grep rabbitmq | awk '{ print $2 }')     #echo $pids     pgrep -u rabbitmq -x beam | xargs kill -9 || echo && echo "    RabbitMQ already stopped"     echo }   function upgrade_rmq_version {     echo "Changing directory to /tmp..."     cd /tmp     echo       echo "wgetting RabbitMQ .rpm file from official website..."     url="http://www.rabbitmq.com/releases/rabbitmq-server/v3.4.3/rabbitmq-server-3.4.3-1.noarch.rpm"     wget $url     echo       echo "Validating signature..."     url="http://www.rabbitmq.com/rabbitmq-signing-key-public.asc"     sudo rpm --import $url     echo       echo "Upgrading RabbitMQ version..."     file="rabbitmq-server-3.4.3-1.noarch.rpm"     sudo yum install $file     echo }   function start_rmq {     echo "Starting RabbitMQ"     sudo service rabbitmq-server start }   function main {     check_rmq_version   # Checking the current version of RabbitMQ     stop_rmq            # Stopping the rabbitmq-server service     kill_erlang         # Killing erlang to ensure RMQ is stopped     upgrade_rmq_version # Upgrading RabbitMQ     start_rmq           # Starting the rabbitmq-server service     check_rmq_version   # Checking the current version of RabbitMQ }   main