Improve corebill and graylisting. (#154)

examples/nodejs_client/.dockerignore

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+node_modules
+npm-debug.log

examples/nodejs_client/Dockerfile

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+FROM node:12.18.3-buster-slim
+
+WORKDIR /text_client
+
+COPY package*.json ./
+RUN npm install
+
+COPY text-client.js ./
+COPY hp-client-lib.js ./
+
+ENTRYPOINT ["node", "text-client.js"]
+
+# Comment this for localhost connection.
+# Client connects to node1 of the cluster.
+CMD ["node1", "8081"]

examples/nodejs_client/client-build.sh

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+#!/bin/bash
+docker build -t hp:text_client .

examples/nodejs_client/client-start.sh

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+#!/bin/bash
+
+# To connect to docker cluster node.
+docker run -i -t --rm --network=hpnet hp:text_client
+
+# To connect to localhost node.
+# docker run -i -t --rm --network=host hp:text_client