shm in docker and docker compose

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Docker shm size refers to the amount of shared memory allotted to a docker container. A Docker /dev/shm is a temporary file storage filesystem using RAM for storing files. It also facilitates inter-process communication (IPC). However, it’s optional to have a shared memory device.

docker run -it --shm-size=256m oracle11g /bin/bash

version: "3.8"
services:
  functionsappservice:
    build:
      context: .
      shm_size: "2gb" <-- used during the build
      dockerfile: Dockerfile
    shm_size: "2gb" <-- used during the run
    image: name:latest <-- name to be used when pushing to the Hub

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