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

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.