Docker for Mac has a default TCP idle timeout of 300 seconds. This script helps disable/restore that as needed

fix-docker-mac-tcp-idle-timeout.sh

#!/usr/bin/env bash

opmode=$1

if [[ "x$opmode" == "x" ]]; then
  echo "Usage:"
  echo "  ${0} <opmode>"
  echo "Where <opmode> is either 'patch' or 'revert'"
  exit 0;
fi

path_to_jq=$(command -v jq)
if [[ ! -x "$path_to_jq" ]]; then
  echo "Installing JQ from Homebrew..."
  brew install jq
fi

if [ "$opmode" == "patch" ]; then
  if [[ -f "${HOME}/.docker-settings-json-backup" ]] ; then
    echo "Backup exists, did you mean to revert?"
    exit 1;
  fi

  if [[ -f "${HOME}/Library/Group Containers/group.com.docker/settings.json" ]]; then
    echo "Backing up your existing docker settings.json to ${HOME}/.docker-settings-json-backup ..."
    cp "${HOME}/Library/Group Containers/group.com.docker/settings.json" "${HOME}/.docker-settings-json-backup"
    echo "Patching docker's settings.json to set vpnKitMaxPortIdleTime=0 ..."
    jq .vpnKitMaxPortIdleTime=0 "${HOME}/Library/Group Containers/group.com.docker/settings.json" > "${TMPDIR}/patched-docker-settings.json"
    mv "${TMPDIR}/patched-docker-settings.json" "${HOME}/Library/Group Containers/group.com.docker/settings.json"
    echo "Success! -- now restart Docker"
    exit 0;
  else
    echo "Couldn't find docker's settings.json in the expected location: ~/Library/Group Containers/group.com.docker/settings.json"
    exit 2;
  fi
fi

if [ "$opmode" == "revert" ]; then
  if [[ ! -f "${HOME}/.docker-settings-json-backup" ]] ; then
    echo "Backup doesn't exist, did you mean to patch?"
    exit 1;
  fi

  if [[ -f "${HOME}/Library/Group Containers/group.com.docker/settings.json" ]]; then
    echo "Restoring the original docker settings.json from backup ..."
    mv "${HOME}/.docker-settings-json-backup" "${HOME}/Library/Group Containers/group.com.docker/settings.json"
    echo "Success! -- now restart Docker"
    exit 0;
  else
    echo "Couldn't find docker's settings.json in the expected location: ~/Library/Group Containers/group.com.docker/settings.json"
    exit 2;
  fi
fi