Blue Green Deployments

This is effectively the same configuration as our Dynamic Upstreams example. The only difference is that api-blue.example.com and api-green.example.com have the same service deployed to them. Shield will load balance requests across the two upstreams according to their weight.

Editing the weight in shield_upstreams.conf will prompt Shield to smoothly transition their weight from its current value to its new target value (NB: The weights do not need to sum to 100).

application.conf

shield {
  domain-watcher: StaticDomainWatcher
  domains: [
    {
      domain-name: "api.example.org"
      middleware-chain: []
      middleware: {}
      listeners: []
      listener-config: {}
      kvstores: {}
      ignoreExtensions: []
      log: {
        request-headers: []
        response-headers: []
      }
      upstream-weighting: {
        step-count: 10
        step-duration: 3 seconds
      }

      upstream-watcher: S3UpstreamWatcher
      s3-upstream-watcher: {
        bucket-name: "s3-example-bucket"
        config-filename: "shield_upstreams.conf"
        refresh-interval: 30s
      }
    }
  ]
}

shield_upstreams.conf

[
  {"serviceType": "swagger2", "serviceLocation": "https://api-blue.example.com", weight: 90},
  {"serviceType": "swagger2", "serviceLocation": "https://api-green.example.com", weight: 10}
]

Getting Started