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Database and Public Endpoints redundancy on Azure Radu Vunvulea
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Radu Vunvulea@RaduVunvuleahttp://vunvulearadu.blogspot.com
DATABASE AND PUBLIC ENDPOINTS REDUNDANCY ON AZURE
OUR SPONSORS MADE THIS POSSIBLE!THANK YOU!
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WCF WPF ENTHUSIASTIC
CLOUD IS NOT MANAGED BY GOD
AGENDA
• Define Redundancy • SQL Database• Storage• Endpoints (HTTP/S, WCF)• VM
In engineering, redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the form of a backup or fail-safe.
Source: Wikipedia
REDUNDANCY
HardwareDual Modular RedundancyTriple Modular RedundancyInformationError detectionCorrectionTime Transient Fault DetectionSoftwareN-versions Programming
TYPE OF REDUNDANCY
HardwareDual Modular RedundancyTriple Modular RedundancyInformationError detectionCorrectionTime Transient Fault DetectionSoftwareN-versions Programming
TYPE OF REDUNDANCY
HardwareDual Modular RedundancyTriple Modular RedundancyInformationError detectionCorrectionTime Transient Fault DetectionSoftwareN-versions Programming
TYPE OF REDUNDANCY
HardwareDual Modular RedundancyTriple Modular RedundancyInformationError detectionCorrectionTime Transient Fault DetectionSoftwareN-versions Programming
TYPE OF REDUNDANCY
HardwareDual Modular RedundancyTriple Modular RedundancyInformationError detectionCorrectionTime Transient Fault DetectionSoftwareN-versions Programming
TYPE OF REDUNDANCY
HOW WE CAN TEST IT?
Netflix: The Chaos Monkey’s job is to randomly kill instances and services within our architecture
CHAOS MONKEY
CHAOS MONKEY
?FAILOVER & SWITCHOVER
FAILOVER & SWITCHOVER
SQL REDUDANCY
DEMO
LET’S SEE SOME CODE
SQL BACKUPS
DEMO
LET’S SEE SOME CODE
ALWAYSON
DISASTER RECOVERY PLAN
Do you have a disaster recovery plan?How long it takes to restart the entire system?How complicated is your checklist?Can you parallelize it?
DISASTER RECOVERY PLAN (DRP)
Do you have a disaster recovery plan?How long it takes to restart the entire system?How complicated is your checklist?Can you parallelize it?
AUTOMATION
DISASTER RECOVERY PLAN (DRP)
ENDPOINT REDUNDANCY
• Any public endpoint• Accessible from internet or private networks
ENDPOINT
LOAD BALANCER
• Free • Out of the box• Lever 3 Load Balancer type
– TCP Level• No Sticky sessions• Partial Configurable
LOAD BALANCER
• Custom app endpoint• Processor level, 500 Errors, Parallel task • Configurable from *.cscfg files
• VM: Using Power Shell
LOAD BALANCER PROBE
<LoadBalancerProbes> <LoadBalancerProbe name="FooProbe" protocol="http" intervalInSeconds="30" path="/api/probe" port="80" timeoutInSeconds="60" /> </LoadBalancerProbes>
REDUNDANCY
TRAFFIC MANAGER
TRAFFIC MANAGER
TRAFFIC MANAGER
• ~Load Balancer (Word Wide level)• Redirect request based on client location• Any kind of endpoint
– VM, Web/Worker Roles, DB and many more– External Endpoints
• Methods: Failover, Round Robin, Performance• Is not FREE (1B DNS query = $0.75)• DNS TTL
DEMO
LET’S SEE SOME CODE
TRAFFIC MANAGER
• [Not Supported] Hybrid Scenarios
WHY REDUNDANCY IS SO IMPORTANT?
• Compute 99.95%• SQL Database 99.90%• Storage 99.90%• Storage (RA-GRS) 99.99%• Active Directory 99.90%• Cache 99.90%• VM 99.95%• Service Bus 99.95%
WINDOWS AZURE SLA’S
• Compute 99.95% 21.6m• SQL Database 99.90% 43.2m• Storage 99.90% 43.2m• Storage (RA-GRS) 99.99% <8m• Active Directory 99.90% 43.2m• Cache 99.90% 43.2m• VM 99.95% 21.6m• Service Bus 99.95% 21.6m
WINDOWS AZURE SLA’S (PER MONTH)
• Compute 99.95% 21.6m• SQL Database 99.90% 43.2m• Storage 99.90% 43.2m• Storage (RA-GRS) 99.99% <8m• Active Directory 99.90% 43.2m• Cache 99.90% 43.2m• VM 99.95% 21.6m• Service Bus 99.95% 21.6m
WINDOWS AZURE SLA’S
• Downtime per month: 216m21.6*2+43.2*4=216m
WINDOWS AZURE SLA’S
• Downtime per month: 216m21.6*2+43.2*4=216m
• Downtime per month: 0.5%(100/43200)*216=0.5%
WINDOWS AZURE SLA’S
• Downtime per month: 216m21.6*2+43.2*4=216m
• Downtime per month: 0.5%(100/43200)*216=0.5%
• Uptime: 99.5%100-0.5=99.5%
WINDOWS AZURE SLA’S
• Compute 99.95% 21.6m• SQL Database 99.90% 43.2m• Storage 99.90% 43.2m• Storage (RA-GRS) 99.99% <8m• Active Directory 99.90% 43.2m• Cache 99.90% 43.2m• VM 99.95% 21.6m• Service Bus 99.95% 21.6m
WINDOWS AZURE SLA’S
WCF ENDPOINTS REDUNDANCY
SERVICE BUS RELAY
Relay
• Steps to integrate in existing application– Add assembly reference to SB Relay– Update WCF configuration sections
(client and backend)
SERVICE BUS RELAY
• Works only with– Async calls– Fire and Forget calls
• Broker between endpoint and client• Store messages until backend is available• WCF Endpoint (Azure or on-premises)• Price model similar with SB (per messages)
SERVICE BUS RELAY
STORAGE REDUNDANCY
• 3 copy of the content in the same data center
LOCALLY REDUNDANT STORAGE
1
3
2
• 2 different data centers• Async replication
GEOGRAPHICALLY REDUNDANT STORAGE
1
3
2
1
3
2
• Similar with GRS• Read only access to the secondary storage• Redirecting managed by developer• Async replication• 99.99% Uptime
READ ACCESS GEO REDUNDANT STORAGE
DEMO
LET’S SEE SOME CODE
TRAFFIC MANAGER
TRAFFIC MANAGER
CHECK HEALTH STATUS OFOTHER SERVICES
IMPORT EXPORT SERVICE
IMPORT/EXPORT SERVICE
DEMO
LET’S SEE SOME CODE
MTBF, MTTR
Mean Time Between FailuresMean Time To Recovery
MTBF -> MTTR
VM REDUNDANCY
• Same features offered by System Center on-premises
• Availability Set• Windows Server Failover Cluster
– Real time Sync
VM
CONCLUSION
• Everything has a price• Calculate up-time for specific roles and use-case• Don’t trust the 99.99% myth• Be as flexible as possible• Automate • Recovery plans
CONCLUSION
Q & A
OUR SPONSORS MADE THIS POSSIBLE!THANK YOU!
