新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch14/docker-images/access-log/Dockerfile

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+FROM node:16.13.1-alpine3.14 AS builder
+
+WORKDIR /src
+COPY src/package.json .
+RUN npm install
+
+# app
+FROM node:16.13.1-alpine3.14
+
+EXPOSE 80
+ENV PORT=80
+CMD ["node", "server.js"]
+
+WORKDIR /app
+COPY --from=builder /src/node_modules/ /app/node_modules/
+COPY src/ .

learn/learn-kubernetes-master/kiamol/ch14/docker-images/access-log/src/config/logConfig.js

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+const { format, transports } = require('winston');
+var logConfig = module.exports = {};
+
+logConfig.options = {
+    format: format.combine(
+        format.splat(),
+        format.simple()
+    ),
+    transports: [
+        new transports.Console({
+            level: 'info'
+        })
+    ]
+};

learn/learn-kubernetes-master/kiamol/ch14/docker-images/access-log/src/log.js

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+const winston = require('winston');
+var logConfig = require('./config/logConfig');
+
+const logger = winston.createLogger(logConfig.options);
+exports.Logger = logger;

learn/learn-kubernetes-master/kiamol/ch14/docker-images/access-log/src/package.json

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+{
+  "name": "access-log",
+  "version": "1.0.0",
+  "main": "server.js",
+  "author": "kiamol",
+  "dependencies": {
+    "restify": "8.5.1",
+    "winston": "3.3.3",
+    "prom-client": "12.0.0"
+  }
+}

learn/learn-kubernetes-master/kiamol/ch14/docker-images/access-log/src/server.js

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+const restify = require("restify");
+const prom = require("prom-client");
+const log = require("./log");
+const os = require("os");
+
+const accessCounter = new prom.Counter({
+  name: "access_log_total",
+  help: "Access Log - total log requests"
+});
+
+const clientIpGauge = new prom.Gauge({
+  name: "access_client_ip_current",
+  help: "Access Log - current unique IP addresses"
+});
+
+//setup Prometheus with standard metrics:
+prom.collectDefaultMetrics();
+
+function stats(req, res, next) {
+  log.Logger.debug("** GET /stats called");
+  var data = {
+    logs: logCount
+  };
+  res.send(data);
+  next();
+}
+
+function respond(req, res, next) {
+  log.Logger.debug("** POST /access-log called");
+  log.Logger.info("Access log, client IP: %s", req.body.clientIp);
+  logCount++;
+
+  //metrics:
+  accessCounter.inc();
+  ipAddresses.push(req.body.clientIp);
+  let uniqueIps = Array.from(new Set(ipAddresses));
+  clientIpGauge.set(uniqueIps.length);
+
+  res.send(201, "Created");
+  next();
+}
+
+var logCount = 0;
+var ipAddresses = new Array();
+var server = restify.createServer();
+server.use(restify.plugins.bodyParser());
+server.get("/stats", stats);
+server.post("/access-log", respond);
+
+server.get("/metrics", function(req, res, next) {
+  res.end(prom.register.metrics());
+});
+
+server.headersTimeout = 20;
+server.keepAliveTimeout = 10;
+server.listen(process.env.PORT, function() {
+  log.Logger.info("%s listening at %s", server.name, server.url);
+});