Can I change fault injection configuration envoy proxy at run-time?

I understand that I can configure fault injection in Envoy proxy with the bellow configuration.

config.filter.http.fault.v2.FaultAbort

{
  "http_status": "...",
  "percentage": "{...}"
}

The above code will fail the specified percentage of the requests with the specified http_status, for instance 500.

Now, can I change it at runtime? I would like to insert a fault against a specific service, say, for 10 seconds and then put it back to normal. Is this possible?

Solution

Yes, you can change things like this in Envoy during operation through one of two mechanisms:

The hot restart mechanism is much simpler for small deployments, so if this is a small effort or test I would recommend that.

The xDS option is basically to create a central server that the Envoy proxy connects to. This server then sends all configurations to the proxy however you want. This is far more complicated (needing to create user-interfaces, default configs, service discovery, etc etc etc) but provides many benefits which is why companies and projects have sprung up with their own implementations.