Windows Azure Zero Downtime Upgrade

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This document compares different approaches for performing zero downtime upgrades of applications hosted on Microsoft Azure: Web Deploy, VIP-swap, load balanced endpoints, and Traffic Manager. Web Deploy allows automatic updates of web roles with minor changes but requires an RDP connection. VIP-swap uses DNS swapping to test upgrades on a staging environment with fast redirection. Load balanced endpoints provides easy scaling but requires manual upgrades and running multiple versions simultaneously. Traffic Manager also uses DNS for isolated testing and fast redirection between environments, but incurs additional costs.

Technology

Zero downtime upgrade
Pavlo Revenkov
EPAM Cloud Computing Competency Center
Email: pavlo_revenkov@epam.com
Skype: rp_risingstar

PaaS: Web deploy

2
contoso.cloudapp.net

v1.0.1

RDP

v1.0.1
v1.0
Web-role #1

Workstation

Storage

v1.0
Web-role #2
lexcorp.cloudapp.net

Comparison
PRO

3
CONTRA

- No need to re-deploy instance

- Minor changes (patch)

- Automatic instance update

- Changes lost if instance recycled

- Small update size

- Support Web-roles only

- Visual Studio support

- RDP connection required
- Virtual machines are not supported

PaaS: VIP-swap

4
Production

Instance #1

v1.1

v1.0

contoso.cloudapp.net

Instance #2

Workstation

Staging

Instance #1

v1.1

{guid}.cloudapp.net

Instance #2

Comparison
PRO

5
CONTRA

- DNS swap takes seconds

- Virtual machines are not supported

- Isolated testing environment

- Additional costs for staging

- Changes can be reverted easily

- Configuration should be identical

- Visual Studio support
- Web/Worker roles are supported

IaaS: Load Balanced Endpoint

6

80
Instance #1

v1.1

v1.0
v1.1
80
Instance #2
contoso.cloudapp.net

Workstation
80
Instance #3

80
Instance #4

Comparison
PRO

7
CONTRA

- Easy scaling process

- Manual upgrade process

- Virtual machines support

- Additional costs for new instances

- No performance degradation

- Two versions running the same time

- No instances downtime

- Configuration cannot be changed
- No Visual Studio support

IaaS: Traffic Manager
v1.1

8

Instance #1

v1.0

prod.cloudapp.net

Instance #2
Workstation

contoso.trafficmanager.net

Instance #1

v1.1

stage.cloudapp.net

Instance #2

Comparison
PRO

9
CONTRA

- Isolated testing environment

- Traffic Manager additional costs

- Reconfiguration takes seconds

- Additional costs for staging

- Virtual machines support

- No Visual Studio support

- Configuration can be changed
- Changes can be reverted easily

References

11

Using Web Deploy in Windows Azure Application:
 msdn.microsoft.com/en-us/library/windowsazure/ff683672.aspx

How to manage Cloud Services:
 windowsazure.com/en-us/documentation/articles/cloud-services-how-to-manage

Load balancing virtual machines:
 windowsazure.com/en-us/documentation/articles/load-balance-virtual-machines/

Windows Azure Traffic Manager Overview:
 msdn.microsoft.com/en-us/library/windowsazure/hh744833.aspx

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Windows Azure Zero Downtime Upgrade

1. Zero downtime upgrade Pavlo Revenkov EPAM Cloud Computing Competency Center Email: pavlo_revenkov@epam.com Skype: rp_risingstar

2. PaaS: Web deploy 2 contoso.cloudapp.net v1.0.1 RDP v1.0.1 v1.0 Web-role #1 Workstation Storage v1.0 Web-role #2 lexcorp.cloudapp.net

3. Comparison PRO 3 CONTRA - No need to re-deploy instance - Minor changes (patch) - Automatic instance update - Changes lost if instance recycled - Small update size - Support Web-roles only - Visual Studio support - RDP connection required - Virtual machines are not supported

4. PaaS: VIP-swap 4 Production Instance #1 v1.1 v1.0 contoso.cloudapp.net Instance #2 Workstation Staging Instance #1 v1.1 {guid}.cloudapp.net Instance #2

5. Comparison PRO 5 CONTRA - DNS swap takes seconds - Virtual machines are not supported - Isolated testing environment - Additional costs for staging - Changes can be reverted easily - Configuration should be identical - Visual Studio support - Web/Worker roles are supported

6. IaaS: Load Balanced Endpoint 6 80 Instance #1 v1.1 v1.0 v1.1 80 Instance #2 contoso.cloudapp.net Workstation 80 Instance #3 80 Instance #4

7. Comparison PRO 7 CONTRA - Easy scaling process - Manual upgrade process - Virtual machines support - Additional costs for new instances - No performance degradation - Two versions running the same time - No instances downtime - Configuration cannot be changed - No Visual Studio support

8. IaaS: Traffic Manager v1.1 8 Instance #1 v1.0 prod.cloudapp.net Instance #2 Workstation contoso.trafficmanager.net Instance #1 v1.1 stage.cloudapp.net Instance #2

9. Comparison PRO 9 CONTRA - Isolated testing environment - Traffic Manager additional costs - Reconfiguration takes seconds - Additional costs for staging - Virtual machines support - No Visual Studio support - Configuration can be changed - Changes can be reverted easily

10. Demo 10

11. References 11 Using Web Deploy in Windows Azure Application:  msdn.microsoft.com/en-us/library/windowsazure/ff683672.aspx How to manage Cloud Services:  windowsazure.com/en-us/documentation/articles/cloud-services-how-to-manage Load balancing virtual machines:  windowsazure.com/en-us/documentation/articles/load-balance-virtual-machines/ Windows Azure Traffic Manager Overview:  msdn.microsoft.com/en-us/library/windowsazure/hh744833.aspx

12. Questions? 12

Windows Azure Zero Downtime Upgrade

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