#!/bin/sh

# Copyright (C) 2011 Netflix

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# scale-up.sh

# Justin Becker

# Creates AWS policies and alarms neccessary to enable auto-scaling

# Optionally can create the alarm to send an email notification on

# an auto-scaling event.

#

# Also creates a rollback.sh script to delete all the policies and

# alarms created.

if [ $# -lt 8 ]; then

echo "usage: scale-up asgname percentage namespace metric threshold period occurrences cooldown [topic-arn]"

exit

fi

# COOLDOWN :

# PERCENTAGE : Number of machines to scale by

# NAMESPACE : Cloudwatch namespace. Example, "AWS/EC2"

# METRIC : Cloudwatch metric. Example, "CPUUtilization"

# THRESHOLD : Metric threshold. Example, 60 -- CPU greater than 60%

# PERIOD : Time in seconds, must be greater than 60

# OCCURRENCES : Number of occurrences of metric crossing threshold in period

# COOLDOWN : Amount of time to wait before policy is active again, allows a time-buffer before firing another capacity event.

ASG=$1

ROLLBACK="rollback-"$ASG"-scale-up.sh"

PERCENTAGE=$2

NAMESPACE=$3

METRIC=$4

THRESHOLD=$5

PERIOD=$6

OCCURRENCES=$7

COOLDOWN=$8

POLICY_NAME=scale-up-$ASG-$PERCENTAGE-$COOLDOWN

POLICY_ALARM_NAME=scale-up-alarm-$ASG-$METRIC-$THRESHOLD

echo "Creating policy: "$POLICY_NAME

ARN_POLICY=`as-put-scaling-policy $POLICY_NAME --auto-scaling-group $ASG --adjustment=$PERCENTAGE --type PercentChangeInCapacity --cooldown $COOLDOWN`

echo "Policy created: "$ARN_POLICY

echo "Creating alarm: "$POLICY_ALARM_NAME

# Check if topic-arn passed in, if so, add as an action

if [ $# -eq 9 ]; then

TOPIC_ARN=$9

ARN_POLICY_ALARM=`mon-put-metric-alarm $POLICY_ALARM_NAME --dimensions "AutoScalingGroupName=$ASG" --comparison-operator GreaterThanThreshold --evaluation-periods $OCCURRENCES --metric-name $METRIC --namespace $NAMESPACE --period $PERIOD --statistic Average --threshold $THRESHOLD --alarm-actions $ARN_POLICY,$TOPIC_ARN`

else

ARN_POLICY_ALARM=`mon-put-metric-alarm $POLICY_ALARM_NAME --dimensions "AutoScalingGroupName=$ASG" --comparison-operator GreaterThanThreshold --evaluation-periods $OCCURRENCES --metric-name $METRIC --namespace $NAMESPACE --period $PERIOD --statistic Average --threshold $THRESHOLD --alarm-actions $ARN_POLICY`

fi

echo "Alarm created: "$POLICY_ALARM_NAME

echo "Creating rollback file: "$ROLLBACK

# ROLLBACK DATA

echo "#!/bin/sh" > $ROLLBACK

echo "echo 'Deleting alarm: '"$POLICY_ALARM_NAME >> $ROLLBACK

echo "mon-delete-alarms "$POLICY_ALARM_NAME >> $ROLLBACK

# ROLLBACK DATA

echo "echo 'Deleting policy: '"$POLICY_NAME >> $ROLLBACK

echo "as-delete-policy "$ARN_POLICY >> $ROLLBACK

Scale-up.sh

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