prometheus examples

Author: marcel-dempers

README.md

@@ -1,9 +1,12 @@
-# docker-development-youtube-series
+# Docker Development Guide
+## a Youtube Series
 
 Hi! 
 
 This is the source code for the YouTube series covering docker-based development workflows.
 
+## Docker Development Basics
+
 Part #1: The Dockerfiles (.NET, Golang, Python, NodeJS) <br/>
 Video:                    https://youtu.be/wyjNpxLRmLg  <br/>
 Source code for Part #1:    https://github.com/marcel-dempers/docker-development-youtube-series/tree/part1
@@ -24,4 +27,11 @@ Part #5:                   Debugging .NET Core code in Docker <br/>
 Video:                     https://youtu.be/ds2bud0ZYTY  <br/>
 Source code for Part #5    https://github.com/marcel-dempers/docker-development-youtube-series/tree/part5
 
+## Prometheus Monitoring
+
+Let's take a look how to monitor application code using Prometheus.
+
+See the [Prometheus Monitoring](./prometheus-monitoring/readme.md) readme guide for detailed steps
+
+
 More details coming soon!

prometheus-monitoring/application/dockerfile

@@ -0,0 +1,30 @@
+FROM golang:1.11.13-alpine3.10 as builder
+
+# installing git
+RUN apk update && apk upgrade && \
+    apk add --no-cache bash git openssh
+
+# setting working directory
+WORKDIR /go/src/app
+
+# installing dependencies
+RUN go get github.com/leonelquinteros/gorand
+RUN go get github.com/sirupsen/logrus
+RUN go get github.com/prometheus/client_golang/prometheus
+RUN go get github.com/prometheus/client_golang/prometheus/promauto
+RUN go get github.com/prometheus/client_golang/prometheus/promhttp
+
+COPY / /go/src/app/
+RUN go build -o myapp
+
+FROM alpine:3.10
+
+RUN apk update && apk upgrade && \
+    apk add --no-cache openssh curl ca-certificates
+
+WORKDIR /go/src/app
+COPY --from=builder /go/src/app/myapp /go/src/app/myapp
+
+EXPOSE 80
+
+CMD ["./myapp"]

prometheus-monitoring/application/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+	"time"
+	"net/http"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+var (
+	requestsProcessed = promauto.NewCounter(prometheus.CounterOpts{
+			Name: "request_operations_total",
+			Help: "The total number of processed requests",
+	})
+)
+
+var (
+    requestDuration = prometheus.NewHistogram(prometheus.HistogramOpts{
+        Name:    "request_duration_seconds",
+        Help:    "Histogram for the runtime of a simple example function.",
+        Buckets: prometheus.LinearBuckets(0.5, 1.0, 2),
+    })
+)
+
+
+
+func main() {
+	
+	fmt.Println("starting...")
+	
+	http.HandleFunc("/", func (w http.ResponseWriter, r *http.Request) {
+		
+		timer := prometheus.NewTimer(requestDuration)
+		defer timer.ObserveDuration()
+		time.Sleep(1000 * time.Millisecond) //Sleep for a second
+		fmt.Fprint(w, "Welcome to my application!")
+		
+		requestsProcessed.Inc()
+	})
+
+	http.Handle("/metrics", promhttp.Handler())
+	http.ListenAndServe(":80", nil)	
+
+}

prometheus-monitoring/docker-compose.yaml

@@ -0,0 +1,24 @@
+version: "3"
+services:
+  my-application:
+    build: ./application
+    container_name: my-application
+    image: my-application
+    ports:
+      - "80:80"
+  prometheus:
+    container_name: prometheus-svc
+    image: prom/prometheus
+    ports: 
+      - "9090:9090"
+    command: --config.file=/etc/prometheus/prometheus.yaml
+    volumes:
+      - ./prometheus.yaml:/etc/prometheus/prometheus.yaml
+  grafana:
+    image: grafana/grafana:5.0.4
+    ports:
+      - "3000:3000"
+    environment:
+      - GF_AUTH_BASIC_ENABLED=false
+      - GF_AUTH_ANONYMOUS_ENABLED=true
+      - GF_AUTH_ANONYMOUS_ORG_ROLE=Admin

prometheus-monitoring/prometheus.yaml

@@ -0,0 +1,8 @@
+global:
+  scrape_interval:     5s
+  evaluation_interval: 30s
+scrape_configs:
+- job_name: my-application
+  honor_labels: true
+  static_configs:
+  - targets: ['my-application']

prometheus-monitoring/readme.md

@@ -0,0 +1,4 @@
+# Prometheus Application Monitoring
+## a Video reference guide
+
+coming soon!