stop_and_start_ec2_instance.sh

#!/bin/bash
# 
# Action
#   stop and start instance.
#
# Precondition
#   - Install aws cli
#   - aws configured and create ~/.aws/config.
#   - Install jq
#
# Ex
#   sh stop_and_start_ec2_instance.sh "<profile>" "<instance id>"
#
# Authored by @kenzo0107

set -eu

function stop_and_start_a_instance_by_instance_id() {
  local _account=$1
  local _instance_id=$2
  local _ret
  local _code

  # check status.
  _ret=$(aws --profile $_account ec2 describe-instance-status --instance-ids $_instance_id --filter "Name=instance-state-name,Values=running" | jq '.InstanceStatuses[] | {InstanceId, InstanceState: .InstanceState.Name, SystemStatus: .SystemStatus.Status, InstanceStatus: .InstanceStatus.Status}')
  echo $_ret
  if [ -z "${_ret}" ]; then
    echo "Instance: $_instance_id is not running. No action."
    return
  fi

  echo ">>> Instance: ${_instance_id} is running. Next, stop and start the instance."

  # stop.
  _ret=$(aws --profile $_account ec2 stop-instances --instance-ids $_instance_id)
  _code=$?
  if [ $_code -ne 0 ]; then
    echo "code: $code, msg: 'failed stopping instance.'"
    exit 1
  fi
  echo $_ret

  # wait stopping.
  _ret=$(aws --profile $_account ec2 wait instance-stopped --instance-ids $_instance_id)
  _code=$?
  if [ $_code -ne 0 ]; then
    echo "code: $code, msg: 'failed waiting for stopping instance.'"
    exit 1
  fi
  echo $_ret

  # start.
  _ret=$(aws --profile $_account ec2 start-instances --instance-ids $_instance_id)
  _code=$?
  if [ $_code -ne 0 ]; then
    echo "code: $code, msg: 'failed starting instance.'"
    exit 1
  fi
  echo $_ret

  # wait starting.
  _ret=$(aws --profile $_account ec2 wait instance-status-ok --instance-ids $_instance_id)
  _code=$?
  if [ $_code -ne 0 ]; then
    echo "code: $code, msg: 'failed waiting for starting instance.'"
    exit 1
  fi
  echo $_ret

  # check status.
  r=$(aws --profile $_account ec2 describe-instance-status --instance-ids $_instance_id --filter "Name=instance-state-name,Values=running" | jq '.InstanceStatuses[] | {InstanceId, InstanceState: .InstanceState.Name, SystemStatus: .SystemStatus.Status, InstanceStatus: .InstanceStatus.Status}')
  echo $r
}

if [ -z $2 ]; then
  echo 'Not enough args. Please set args - ex) sh stop_and_start_ec2_instance.sh <profile> <instance>'
  exit 1
fi

profile="$1"
instance_id="$2"
stop_and_start_a_instance_by_instance_id "${profile}" "${instance_id}"