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blue-green-template's Introduction

blue-green

A template for Blue Green deployment using GCP and Terraform. Inspired by the design described here

blue-green

usage

Initial setup (one time)

TF_VAR_active_stack=blue \
TF_VAR_blue_version=v1 \
TF_VAR_green_version=v1 \
TF_VAR_deployment=false \
terraform apply

On deployment bring up a new stack

TF_VAR_active_stack=blue \
TF_VAR_blue_version=v1 \
TF_VAR_green_version=v2 \
TF_VAR_deployment=true \
terraform apply

Traffic switch

Switch traffic to the new stack
TF_VAR_active_stack=green \
TF_VAR_blue_version=v1 \
TF_VAR_green_version=v2 \
TF_VAR_deployment=true \
terraform apply
Update the Old stack
TF_VAR_active_stack=green \
TF_VAR_blue_version=v2 \
TF_VAR_green_version=v2 \
TF_VAR_deployment=true \
terraform apply
Switch traffic back to (updated) old stack
TF_VAR_active_stack=blue \
TF_VAR_blue_version=v2 \
TF_VAR_green_version=v2 \
TF_VAR_deployment=true \
terraform apply

Clean up deployment stack

TF_VAR_active_stack=blue \
TF_VAR_blue_version=v2 \
TF_VAR_green_version=v2 \
TF_VAR_deployment=false \
terraform apply

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