leveraging elastic web scale computing with aws
TRANSCRIPT
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LeveragingElasticWeb-ScaleComputingwithAWS
Shiva Narayanaswamy
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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EC2 Basics
Virtual Servers in the Cloud• One instance to thousands of instances• In any public AWS region• Create, start, stop, configure, monitor as desired• Install any software: web, business, client/server,
batch processing• Pay only for capacity you use• Variety of cost models AmazonEC2
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EC2 Basics: costmodels
On-Demand Reserved Spot Dedicated
Payupfrontinexchangeforhourlypricesthatare50-75%lowerthan
On-Demand
Payforcomputecapacitybythehour.Nolong-term
commitments
BidforunusedAmazonEC2capacity
LaunchinstancesinVPCondedicatedcustomerhardware
Customerscancombinemultiplepurchasetypestooptimizepricingbasedoncurrentandforecastcapacityneeds.
Spikyworkloads Committedutilization Time-insensitiveworkloads Highlysensitiveworkloads
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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Provisioning and Lifecycle
• Create -> Start -> Stop -> Terminate• Manually in console• Automate via API (or other tools)• Automatically based on demand
(demand curve)
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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Instance TypesGPU
EnabledGeneralPurpose
StorageandIOOptimized
ComputeOptimized
MemoryOptimized
M3 C3 I2
CG1M1 C1 CR1CC2 HI1 HS1
G2
M3 C3 I2 HS1
M2
R3G2
AddedInstance
Types
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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Amazon Machine Images
Yourmachineimages
AMIsyouhavecreatedfromEC2instancesCanbekeptprivateorsharedwithother
accounts
Amazonmaintained
SetofLinuxandWindowsimagesKeptuptodatebyAmazonineach
region
Communitymaintained
ImagespublishedbyotherAWSusersManagedandmaintainedbyMarketplace
partners
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Amazon Machine Images
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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Bootstrapping:metadataanduserdata
• EveryEC2Instancehasaccesstolocalinstancemetadataanduserdataservice
Instance request
Userdata
Instance
Meta-dataservice
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Bootstrapping:metadata anduserdata
• Metadata:immutableinformationabouttheinstance• AccessiblefromwithintheinstanceviaHTTPathttp://169.254.169.254/latest/meta-data/
• Script(s)oninstancemayretrieveusefulinformationabouttheinstance,suchas:
• Hostname• AMIID• InstanceID• Public/PrivateDNS• AvailabilityZone
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Bootstrapping:metadataanduserdata
• UserData:passupto16KBoftexttoaninstanceonlaunch• AccessiblefromwithintheinstanceviaHTTPathttp://169.254.169.254/latest/user-data/
• Textcanbeparsedbyscriptoninstanceandusedtoconfigurethemachine
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Custom script on AMI
(script_runner.py) fetches userdata,
parses it, and configures EC2 Instance
on boot
Bootstrapping:metadataanduserdata
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• CloudInit executesUserDataonfirstbootifUserDatabeginswith:• #!(Linux)• <script>(Windows;technically,EC2Config,notCloudInit,doesthis)
• CloudInit isinstalledonAmazonLinux,Ubuntu,andRHELAMIs• EC2ConfigisinstalledonWindowsServerAMIs• Bothmaybeinstalledonotherdistributionsviaapackagerepoorsource
Bootstrapping:UserData andCloudInit
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• UserDatatoinstallApacheandMySQLonboot,andattachanEIP:
#!/bin/bash
# Install Apache, PHP, and MySQLyum install –y httpd mysql-server
# Attach an Elastic IP to this instanceec2-associate-address \
23.34.45.56 \-i $(curl http://169.254.169.254/latest/meta-data/instance-id)
Bootstrapping:UserData andCloudInit
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Bootstrapping
BakeanAMI
Startaninstance
Configuretheinstance
CreateanAMIfromyourinstance
StartnewonesfromtheAMI
Configuredynamically
Launchaninstance
Usemetadataserviceandcloud-init toperformactionson
instancewhenitlaunches
Useconfig managementtoolslikePuppet/Chef/Opsworks
vs
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Bootstrapping
BakeanAMI Configuredynamically
Buildyourbaseimagesandsetupcustominitialisation
scripts
Maintainyour‘golden’base
Usebootstrappingtopasscustominformationinandperformpostlaunchtasks.
+
Sweetspot
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Bootstrapping: AMIs
Linux
JEE
YourCode
Log4J
Spring
Hibernate
Struts
Tomcat
Apache
JavaAppStack
Example full stack required to run your application.
Let’s use the 3 bootstrapping
techniques
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Bootstrapping: AMIbake
Fully-functional AMI is pre-build and ready to launch from the AMI inventory
InventoryofAMIs
Linux
JEE
YourCode
Log4J
Spring
Hibernate
Struts
Tomcat
Apache
AmazonEC2
Linux
JEE
YourCode
Log4J
Spring
Hibernate
Struts
Tomcat
Apache
Linux
JEE
YourCode
Log4J
Spring
Hibernate
Struts
Tomcat
Apache
Linux
JEE
YourCode
Log4J
Spring
Hibernate
Struts
Tomcat
Apache
Linux
JEE
YourCode
Log4J
Spring
Hibernate
Struts
Tomcat
Apache
JavaAMI
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Bootstrapping: Configuredynamically
Base OS AMI
An AMI with minimal components (OS, J2EE, and Chef/Puppet) is launched.
All configuration occurs via Chef/Puppet after instance launch
InventoryofAMIs
AmazonEC2
OSAMI
Fetchonboot
Linux
JEE
YourCode
S3
Hibernate
Tomcat
Log4J
Spring
Struts
Apache
Linux
JEE
Linux
JEEChef/Puppet
Chef/Puppet
scripts
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Bootstrapping: Sweetspot
Partially-configured AMI
A “Golden Image” is launched, with scripts fetching/installing app code
and other supporting components on boot
InventoryofAMIs
AmazonEC2
JavaAMI
YourCode
S3
Log4J
Spring
Struts
Linux
JEE
Hibernate
Tomcat
Apache
Fetchonboot
Fetchonboot
Linux
JEE
Hibernate
Tomcat
Apache
Linux
JEE
Hibernate
Tomcat
Apache
Linux
JEE
Hibernate
Tomcat
Apache
Linux
JEE
Hibernate
Tomcat
Apache
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Whydothis?
AutomationLessfingers,lessmistakes
AvailabilityDrivehigher
availabilitywithself-healing
SecurityInstanceslockeddownbydefault
FlexibleShell,
Powershell,CloudFormation,Chef,Puppet,OpsWorks
ScaleManagelargescale
deploymentsanddriveautoscaling
EfficiencyAuditandmanageyourestatewithlesstime&effort
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Do Don’t
Somedosanddon’ts
UseIAMroles
Gokeylessifyoucan
StrikeabalancebetweenAMIanddynamicbootstrapping
PutyourAPIaccesskeysintocode(andthenpublishtoGIT)orbake
intoAMIs(andshare)
L
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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Monitoring EC2 with CloudWatch
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EC2BasicsInstanceLifecycleEC2InstanceTypesUsingAmazonMachineImagesBootstrappingEC2InstancesMonitoring EC2withCloudWatchAutoscaling
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TypesofScaling
• VerticalScaling• Changinginstancesize• IncreasingEBSCapacity
• HorizontalScaling• Adding/removinginstances• ELB• Autoscaling
r3.8xlarge
c3.2xlarge
m3.medium
m3.medium m3.medium m3.medium
m3.medium m3.medium m3.medium
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VerticalScaling
• DifferentEC2instancetype• Highmemoryinstances• HighCPUinstances• HighI/Oinstances• Highstorageinstances
• Easytochangeinstancesizes• Willhitanendpointeventually• Requiresinstancetobestopped
r3.8xlarge
c3.2xlarge
m3.medium
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TraditionalITUsagePatterns
OnandOff FastGrowth
Variablepeaks Predictablepeaks
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TraditionalITUsagePatterns
OnandOff FastGrowth
Variablepeaks Predictablepeaks
PoorService
WASTE
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CloudITUsagePatterns(AutoScaling)
OnandOff FastGrowth
Variablepeaks Predictablepeaks
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AutoScaling• Automaticresizingofcomputeclustersbasedondemand• Defineminimumandmaximumnumberofinstances• Definewhenscalingoutandinoccurs• UsemetricscollectedinAmazonCloudWatchtodrivescaling• RunAutoScalingforOn-DemandandSpotinstancetypes• ItsFree! Amazon
CloudWatch
UsageMetrics
ScalingInstructions
AutoScalingGroup
QueueMetrics
AutoScaling
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DescribeswhatAutoScalingwillcreatewhenadding
Instances- Similartoec2-run-instancesAPIcommand
AMIInstanceTypeSecurityGroupInstanceKeyPair
Onlyoneactivelaunchconfigurationatatime
AutoScalingwillterminateinstanceswitholdlaunch
configurationfirstrollingupdate
AutoScalingmanagedgroupingofEC2instances
Automatichealthchecktomaintainpoolsize
Automaticallyscalethenumberofinstancesbypolicy– Min,Max,
Desired
AutomaticIntegrationwithELB
Automaticdistribution&balancingacrossAZs
ParametersforperforminganAutoScalingaction
ScaleUp/Downandbyhowmuch
ChangeInCapacity (+/- #)ExactCapacity (#)
ChangeInPercent (+/- %)
CoolDown(seconds)
PolicycanbetriggeredbyCloudWatch events
Launch Configuration Auto-Scaling Group Auto-Scaling Policy
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Scalingplan
• Scalebasedondemand• Manualscaling• Scalebasedonschedule• Maintaincurrentinstancelevelsatalltime
AutoScaling
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AutoScalingLifecycles
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Autoscaling
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Autoscaling
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Autoscaling
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Autoscaling
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Autoscaling
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Availability Zone A Availability Zone B
Autoscaling: AutoScalingGroup
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Availability Zone A Availability Zone B
Autoscaling: AutoScalingGroup
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Availability Zone A Availability Zone B
Autoscaling: AutoScalingGroup
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Availability Zone A Availability Zone B
Autoscaling: AutoScalingGroup
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Availability Zone A Availability Zone B
Autoscaling: AutoScalingGroup
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Latency
CloudWatchAutoScaling
ELB
Auto scaling Group
Autoscaling: ELB+CloudWatch
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• ToolsUsed:• CloudFormation script–
• Createamulti-AZ,loadbalancedandAutoScaledsamplewebsiterunningonanApacheWebServer(m1.small).TheapplicationisconfiguredtospanallAvailabilityZonesintheregionandisAuto-ScaledbasedontheCPUutilizationofthewebservers.
• BeeswithMachineGuns– Performancetestingtool• Acloudformation scriptthatspinsupadistibuted performancetestingtoolbasedonapacheeb tool.ThistoolwillhittheELBwith1000’sofconcurrentrequestsforatotalof100’softhousandsofrequest,thusloadingthewebserverbehindtheELB.
• Expectedresult• TheApachewebserverwillscaletoservetrafficwithoutanycustomerimpact.
Autoscaling: DEMO
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• CloudFormation script(Autoscalingapachewebserver)• Auto-scalinggroupconfiguration:
• Min:1• Max:3• Cooldown:300
• ScalingPolicies:• ScalingUp:
• CPUUtilization>20%for1consecutiveperiodof60seconds• Action:Add1instance• Thenwait:60secondsbeforenextoperation
• ScalingDown:• CPUUtilization<10%for2consecutiveperiodsof60seconds• Action:Remove1instance• Thenwait:60secondsbeforenextoperation
• BeeswithMachineguns(NASTY)
Demo Information
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Autoscaling isn’tonesizefitsall
• Choosetherightmetrics• CPUUsage• QueueDepth• Numberofconcurrentusers
• Scaletooaggressively• Overprovisioning:increasescosts• Bounciness:Addmorethanyouneedandhavetopartiallyscalebackshortlyafterscalingup,increasingcosts.
• Scaletootimidly• Poorperformance• Outagesduetolackofcapacity
• Scaleoutearly/Scaleinslowly
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Stopdoingthese:Provisioningandfixingservers
TreatingcomputeasphysicalthingsThinkingofcomputeasafinitecommitment
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andstartdoingthese
SecurityBuildsystemssecureby
default
ElasticityStatelessautoscaling
applications
ReplacenotfixBuildfromscratch,don’t
fixsomethingUnconstrainedSaygoodbyeto
traditionalcapacityplanning
BecostawareTagresources,playwith
instancetypes
AutomationCreateinstanceswhenyouneedthem,drop
themwhennot
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What’smore?
• Attach/DetachInstancesfromAutoScalingGroups• PlaceinstancesintoStandbyStatetoTroubleshoot• HoldinstancesinPendingstateforinstallingsoftware/retrievelogs• CreateanAutoScalingGroup/LaunchConfigurationbasedonarunninginstance
• AutoscalingLifecyclehooks
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Questions?