Failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB) in quic golang appengine

Question

I am using a google cloud app engine to deploy my quic-go server. But getting the error:

failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB).

I am using app.yaml file to build a docker file which is as follows:

FROM golang:1.18.3
 
RUN mkdir /app
ADD . /app
WORKDIR /app

RUN apt-get update && apt-get install -y ffmpeg

CMD sudo --sysctl net.core.rmem_default=15000000
CMD sudo --sysctl net.core.rmem_max=15000000


RUN go build -x server.go 

ENV   GCS_BUCKETNAME  xyz
ENV  AI_CLIENT_SSL_CERT  /path to cert 
ENV  AI_CLIENT_SSL_KEY  /path to key
ENV  GCP_BUCKET_SERVICE_ACCOUNT_CREDS /path to google cloud service account credential

CMD [ "./server" ]

This is my app.yaml

runtime: custom
env: flex
env_variables:
  GCS_BUCKETNAME : "xyz"
  AI_CLIENT_SSL_CERT : "./path to cert"  
  AI_CLIENT_SSL_KEY : "./path to key"
  GCP_BUCKET_SERVICE_ACCOUNT_CREDS : "./path to google cloud credential.json file"


service: streaming-app

automatic_scaling:
  min_num_instances: 1
  max_num_instances: 20
  cpu_utilization:
    target_utilization: 0.85
  target_concurrent_requests: 100

Any sort of help will be appreciated.

Answer 1

Since sysctl is an OS-level config that doesn't fit in line with App Engine's principle use case. App Engine does not currently have any way of configuring the underlying sysctl config files. I believe that Google Kubernetes engine may be a better use case for running that server, as App Engine environments have a limited set of configurable settings.

can you tell me the scenarios when this file is not present in the kernel?

I’m not sure about the scenarios as I have least experience with kernel. For me it seems a different question rather than original post. you can raise a new StackOverflow question regarding this.