feat(examples): Add redis-pubsub example

Author: Nik Mohamad Aizuddin b. Nik Azmi

redis-pubsub/Dockerfile

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+FROM docker.io/node:14.16.1
+MAINTAINER extra2000 <https://github.com/extra2000>
+
+COPY ./project /srv/project
+WORKDIR /srv/project
+RUN npm install

redis-pubsub/README.md

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+# Sample apps: Redis Pub/Sub
+
+Example how to use Redis for Pub/Sub. Credits to https://medium.com/@ridwanfajar/using-redis-pub-sub-with-node-js-its-quite-easy-c9c8b4dae79f
+
+
+## Deploy Redis pod
+
+```
+$ podman play kube --network=sampleapps redis-pod.yaml
+```
+
+To test Redis deployment, execute the following command and make sure the output is `PONG`:
+```
+$ podman exec -it redis-pod-redis01 redis-cli -a abcde12345 ping
+```
+
+
+## Deploy publisher and producer services
+
+```
+$ podman build -t extra2000/redis-pubsub/pubsub .
+$ podman play kube --network=sampleapps subscriber-pod.yaml
+$ podman play kube --network=sampleapps publisher-pod.yaml
+```
+
+See logs:
+```
+$ podman logs subscriber-pod-subscriber
+```
+
+
+## To clean up
+
+```
+$ podman pod rm --force publisher-pod subscriber-pod redis-pod
+```

redis-pubsub/project/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and *not* Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port

redis-pubsub/project/package.json

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+{
+  "name": "redis-pubsub",
+  "version": "1.0.0",
+  "description": "Redis Pub/Sub example",
+  "author": "extra2000",
+  "license": "MIT",
+  "scripts": {
+    "publisher": "node src/publisher.js",
+    "subscriber": "node src/subscriber.js"
+  },
+  "dependencies": {
+    "redis": "^3.1.2"
+  }
+}

redis-pubsub/project/src/publisher.js

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+var redis = require("redis");
+
+const publisher = redis.createClient({
+    host: 'redis-pod.sampleapps',
+    port: '6379',
+    password: 'abcde12345'
+});
+
+publisher.publish("notification", "{\"message\":\"Hello world from Asgardian!\"}", function(){
+    process.exit(0);
+});

redis-pubsub/project/src/subscriber.js

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+var redis = require("redis");
+
+const subscriber = redis.createClient({
+    host: 'redis-pod.sampleapps',
+    port: '6379',
+    password: 'abcde12345'
+});
+
+subscriber.on("message", function (channel, message) {
+    console.log("Message: " + message + " on channel: " + channel + " is arrive!");
+});
+
+subscriber.subscribe("notification");

redis-pubsub/publisher-pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: publisher-pod
+spec:
+  restartPolicy: Never
+  containers:
+  - name: publisher
+    image: extra2000/redis-pubsub/pubsub
+    command: ['npm', 'run', 'publisher']

redis-pubsub/redis-pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: redis-pod
+  name: redis-pod
+spec:
+  restartPolicy: OnFailure
+  containers:
+  - name: redis01
+    image: docker.io/redis:6.2-alpine
+    command: ['redis-server', '--requirepass', "abcde12345"]
+    securityContext:
+      allowPrivilegeEscalation: false
+      privileged: false
+      capabilities:
+        add: []
+        drop:
+        - CAP_MKNOD
+        - CAP_NET_RAW
+        - CAP_AUDIT_WRITE
+      seLinuxOptions: {}
+    resources:
+      requests:
+        memory: 200Mi
+      limits:
+        memory: 200Mi

redis-pubsub/subscriber-pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: subscriber-pod
+spec:
+  restartPolicy: Never
+  containers:
+  - name: subscriber
+    image: extra2000/redis-pubsub/pubsub
+    command: ['npm', 'run', 'subscriber']