NATS with moleculer. How can I change NATS max_payload value?

问题

My problem is that I need to increase max_payload value that NATS receive but I have no idea where I can do it.

The project is using Moleculer and NATS is created as a container with docker.

When I try to make a request which is bigger than 1MB NATS returns:

ERROR - NATS error. 'Maximum Payload Violation

Inside dockstation logs NATS returns:

cid:1 - maximum payload exceeded: 1341972 vs 1048576

I tried the following items:

Changing tranporter inside Moleculer Broker configs (https://moleculer.services/docs/0.12/transporters.html);
Add an config file for NATS to modify some options (https://hub.docker.com/_/nats);

Code example of Moleculer Broker configs:

const brokerConfig: BrokerOptions = {
  ...,
  transporter: "NATS",
  transit: {
    maxQueueSize: 100000,
    disableReconnect: false,
    disableVersionCheck: false,
  },
  ...
}

Code example of nats config file:

{
  max_payload: 1000000
}

Error when I run docker with NATS config file:

docker: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "process_linux.go:449: container init caused \"rootfs_linux.go:58: mounting \\\"/home/matheus/nats-server.conf\\\" to rootfs \\\"/var/lib/docker/overlay2/08959b2fce0deb2abea27e103f7f4426b7ed6f3ef64b214f713ebb993c2373e6/merged\\\" at \\\"/var/lib/docker/overlay2/08959b2fce0deb2abea27e103f7f4426b7ed6f3ef64b214f713ebb993c2373e6/merged/nats-server.conf\\\" caused \\\"not a directory\\\"\"": unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type. error Command failed with exit code 125.

回答1:

You should create a configuration file for NATS. And push it to the container as a Docker volume and set the command as -c nats-server.conf

nats-server.conf

max_payload: 4Mb

Start container

docker run -d -p 4222:4222 -v ~/nats-server.conf:/nats-server.conf nats -c /nats-server.conf

来源：https://stackoverflow.com/questions/65638631/nats-with-moleculer-how-can-i-change-nats-max-payload-value

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