Blue green deployment

[ncelisabet]

This issue is a: (mark with an x)

• bug report -> please search issues before submitting
• documentation issue or request
• regression (a behavior that used to work and stopped in a new release)

Issue description

I'm trying to implement a blue/green deployment pattern and would love to know if you have any recommendations. I have multiple container apps and an Application Gateway

What I have considered so far:

Using ingress traffic and label weights

The thought here is that each container app has a green and a blue label on its revisions, and their ingresses decides which revision gets traffic

Pros

• Granular support fort shifting traffic

Cons

• Doesn't really work (Ingress traffic with label weights set by azd can't be changed with az or in portal #1382)
• It's more complex to switch each container one by one
• Can't switch the whole system between blue and green at once

Using two container app environments

The thought here is to have a blue and a green container app environment. Each service with external endpoints will have two backend pools that the app gw can switch between.

Pros

• The whole system is either blue or green
• Network settings (and other settings that has more to do with the container app rather than a revision in it) can be changed without affecting production

Cons

• Possibly lots of backend pools
• Not possible to do canary/gradual deployments

Using something between app gw and cae

If we stick to having two container app environments, we might put something between them whose job it is to route traffic to either blue or green environment. Something like nginx or ocelot

Pros

• The same benefits as the previous solution as it builds on the same idea
• Good control over traffic - possible to do canary deployments

Cons

• Setting up and maintaining another service
• Cost of having another service

Conclusion

There might be other possibilities that I haven't even considered - do you have any ideas or suggestions?

Do you have any general recommendations?