Configuration generator

Envoy configurations can become relatively complicated. The source distribution includes a version of the configuration generator that uses jinja templating to make the configurations easier to create and manage. We have also included three example configuration templates for each of the above three scenarios.

• Generator script: configs/configgen.py

• Service to service template: configs/envoy_service_to_service.template.yaml

• Front proxy template: configs/envoy_front_proxy.template.yaml

• Double proxy template: configs/envoy_double_proxy.template.yaml

To generate the example configurations run the following from the root of the repo:

mkdir -p generated/configs
bazel build //configs:example_configs
tar xvf $PWD/bazel-out/k8-fastbuild/bin/configs/example_configs.tar -C generated/configs

The previous command will produce three fully expanded configurations using some variables defined inside of configgen.py. See the comments inside of configgen.py for detailed information on how the different expansions work.

A few notes about the example configurations:

• An instance of endpoint discovery service is assumed to be running at discovery.yourcompany.net.

• DNS for yourcompany.net is assumed to be setup for various things. Search the configuration templates for different instances of this.

• Tracing is configured for LightStep. To disable this or enable Zipkin or Datadog tracing, delete or change the tracing configuration accordingly.

• The configuration demonstrates the use of a global rate limiting service. To disable this delete the rate limit configuration.

• Route discovery service is configured for the service to service reference configuration and it is assumed to be running at rds.yourcompany.net.

• Cluster discovery service is configured for the service to service reference configuration and it is assumed that be running at cds.yourcompany.net.