GCloud Compute Engine: add multiple firewall rules for desired TCP ports

allow-ingress-multiple-ports.sh

#!/bin/bash
BASE_RULE_NAME="rule-allow-tcp"
TARGET_NET_TAG="frontserver" # For more info see https://cloud.google.com/vpc/docs/add-remove-network-tags

for PORT in 4201 4202 4203 4204 4205 4206 4207 4208 4209
do
  # See reference https://cloud.google.com/vpc/docs/using-firewalls
  gcloud compute firewall-rules create $BASE_RULE_NAME-$PORT \
    --source-ranges 0.0.0.0/0 \
    --allow tcp:$PORT \
    --target-tags=$TARGET_NET_TAG
done