🎉

2021-02-02 21:21:12 +01:00 · 2021-02-02 21:21:12 +01:00 · 7984223fb1
commit 7984223fb1
12 changed files with 1285 additions and 0 deletions
--- a/11
+++ b/11
@ -0,0 +1,11 @@
+FROM alpine
+
+RUN apk add --no-cache ca-certificates
+
+COPY prometheus-docker-labels-discovery /prometheus-docker-labels-discovery
+
+# Because of access to docker.sock, it's easier to run it as root...
+#USER nobody
+
+ENTRYPOINT ["/prometheus-docker-labels-discovery"]
+EXPOSE 8080
--- a/47
+++ b/47
@ -0,0 +1,47 @@
+
+VERSION=v1.0.0
+GOOS=linux
+GOCMD=go
+GOBUILD=$(GOCMD) build
+GOCLEAN=$(GOCMD) clean
+GOTEST=$(GOCMD) test
+GOLINT=golangci-lint run
+VERSION_MAJOR=$(shell echo $(VERSION) | cut -f1 -d.)
+VERSION_MINOR=$(shell echo $(VERSION) | cut -f2 -d.)
+BINARY_NAME=prometheus-docker-labels-discovery
+GO_PACKAGE=sqooba/prometheus-docker-labels-discovery
+DOCKER_REGISTRY=
+GIT_COMMIT=$(shell git rev-parse HEAD)
+GIT_DIRTY=$(shell test -n "`git status --porcelain`" && echo "+CHANGES" || true)
+BUILD_DATE=$(shell date '+%Y-%m-%d-%H:%M:%S')
+
+ensure:
+	GOOS=${GOOS} $(GOCMD) mod vendor
+
+clean:
+	$(GOCLEAN)
+
+lint:
+	$(GOLINT) ...
+
+build:
+	GOOS=${GOOS} $(GOBUILD) \
+		-ldflags "-X version.GitCommit=${GIT_COMMIT}${GIT_DIRTY} \
+				  -X version.BuildDate=${BUILD_DATE} \
+				  -X version.Version=${VERSION}" \
+		-o ${BINARY_NAME} .
+
+package:
+	docker build -f Dockerfile \
+	  -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION) \
+	  -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR) \
+	  -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR) \
+	  .
+
+test:
+	go test ./...
+
+release:
+	docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION)
+	docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR)
+	docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR)
--- a/README.md
+++ b/README.md
@ -0,0 +1,77 @@
+Discover docker containers to scrape based on labels
+====
+
+This tool aims at discovering containers running
+with `prometheus.io/scrape=true` annotations
+from a given docker engine, and auto-configure prometheus for scraping.
+
+This tool is standalone and write the discovered containers (services) in a file,
+which is in turn passed to Prometheus file service discovery to start the scraping jobs.
+
+![overall diagram](overall-diagram.png)
+
+# Example via a docker-compose
+
+The following part is giving a complete example of configuring the docker-labels discovery mechanism.
+It is based in three parts, namely:
+- Configure prometheus-docker-labels-discovery
+- Configure Prometheus file_sd_configs
+- Configure your services
+
+## Configure prometheus-docker-labels-discovery
+
+```
+  prometheus-docker-labels-discovery:
+    image: sqooba/prometheus-docker-labels-discovery:v1
+    restart: unless-stopped
+    networks:
+      - monitoring_default # make sure this network exists and is connected to prometheus
+#    ports:
+#      - "8080"
+    security_opt:
+      - no-new-privileges:true
+    volumes: # Mount the JSON file that will be exchanged with prometheus
+      - ./from-docker-labels.json:/tmp/from-docker-labels.json
+    environment:
+      - PROMETHEUS_CONFIG_FILE_PATH=/tmp/from-docker-labels.json
+      - DOCKER_NETWORK_NAME=bridge
+      - PROMETHEUS_COMMON_LABELS=commonlabel1=commonvalue1
+```
+
+## Configure Prometheus
+
+Prometheus needs to be configured using [file_sd_configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config)
+scrape config.
+
+```
+scrape_configs:
+- job_name: 'docker-labels-sd'
+  file_sd_configs:
+  - files:
+    - 'from_docker_labels.json'
+```
+
+## Configure your services
+
+Any service can now be configured using [docker labels](https://docs.docker.com/config/labels-custom-metadata/).
+The following example shows in docker-compose style how this looks like:
+
+```
+services:
+  test-metrics:
+    image: dummy-metrics:v1
+    labels:
+      - "prometheus.io/scrape=true"
+      - "prometheus.io/path=/metrics"
+      - "prometheus.io/extra-labels=k1:v1,k2:v2"
+```
+
+The exhaustive list of labels to configure properly your service is provided below:
+
+| Annotation | Definition | Example |
+| ---------- | ---------- | ------- |
+| `prometheus.io/scrape` | Main label to ensure this container will be scraped by Prometheus. Required value is `true`. Any other value will not be considered. | `prometheus.io/scrape=true`|
+| `prometheus.io/port` | Specify which port to use for the scraping. In case of a single port exposed, this configuration can be omitted. | `prometheus.io/port=8080` |
+| `prometheus.io/path` | Alternative path for scraping the metrics. Default from Prometheus is `/`. | `prometheus.io/path=/metrics` |
+| `prometheus.io/scheme` | Alternative scheme for scraping thee metrics. Default from Prometheus is `http`. | `prometheus.io/scheme=https` |
+| `prometheus.io/extra-labels` | Any extra labels to add to the metrics scraped for this container. Comma separated key:value pairs. | `prometheus.io/extra-labels=label1:value1,label2:value2,...` |
--- a/docker_handler.go
+++ b/docker_handler.go
@ -0,0 +1,323 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/client"
+	"github.com/prometheus/common/model"
+	"sync"
+	"time"
+)
+
+type dockerHandler struct {
+	config             envConfig
+	client             *client.Client
+	writer             *promHandler
+	managedContainers  map[string]containerScrapeConfig
+	lock               sync.Locker
+	startContainerChan chan []string
+	stopContainerChan  chan []string
+}
+
+const (
+	dockerEventActionStart   = "start"
+	dockerEventActionDie     = "die"
+	dockerEventTypeContainer = "container"
+
+	prometheusEnableScrapeAnnotation      = "prometheus.io/scrape"
+	prometheusEnableScrapeAnnotationValue = "true"
+	prometheusPortAnnotation              = "prometheus.io/port"
+	prometheusIpAnnotation                = "prometheus.io/ip"
+	prometheusPathAnnotation              = "prometheus.io/path"
+	prometheusSchemeAnnotation            = "prometheus.io/scheme"
+	prometheusExtraLabelsAnnotation       = "prometheus.io/extra-labels" // comma separated extra labels for this pod
+)
+
+type containerScrapeConfig struct {
+	Targets []string          `json:"targets"`
+	Labels  map[string]string `json:"labels"`
+}
+
+func newDockerHandler(config envConfig, writer *promHandler) (*dockerHandler, error) {
+
+	dockerClient, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = dockerClient.Ping(context.Background())
+	if err != nil {
+		log.Debugf("Got an error while pinging the docker engine %v, err = %v", dockerClient.DaemonHost(), err)
+		return nil, err
+	}
+
+	networks, err := dockerClient.NetworkList(context.Background(), types.NetworkListOptions{})
+	if err != nil {
+		log.Debugf("Got an error while listing the networks, err = %v", err)
+		return nil, err
+	}
+	foundNetwork := false
+	for _, n := range networks {
+		if n.Name == config.DockerNetworkName {
+			foundNetwork = true
+		}
+	}
+	if !foundNetwork {
+		log.Debugf("No network found with the name %s...", config.DockerNetworkName)
+		return nil, fmt.Errorf("no network named %s found. Please docker network create %s", config.DockerNetworkName, config.DockerNetworkName)
+	}
+
+	handler := &dockerHandler{
+		config:             config,
+		client:             dockerClient,
+		writer:             writer,
+		managedContainers:  make(map[string]containerScrapeConfig),
+		lock:               &sync.Mutex{},
+		startContainerChan: make(chan []string),
+		stopContainerChan:  make(chan []string),
+	}
+
+	return handler, nil
+}
+
+func (h *dockerHandler) handle() error {
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	go h.listenToDockerEvents(ctx)
+	go h.listDockerContainers(ctx)
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case containersToAdd := <-h.startContainerChan:
+			h.addContainersToScrapeConfig(containersToAdd)
+		case containerToRemove := <-h.stopContainerChan:
+			h.removeContainersFromScrapeConfig(containerToRemove)
+		}
+	}
+}
+
+func (h *dockerHandler) pollDockerContainers(ctx context.Context) {
+	h.listDockerContainers(ctx)
+	if h.config.DockerPollFrequency > 0 {
+		for range time.Tick(h.config.DockerPollFrequency) {
+			h.listDockerContainers(ctx)
+		}
+	}
+}
+
+func (h *dockerHandler) listDockerContainers(ctx context.Context) {
+
+	f := filters.NewArgs(filters.KeyValuePair{Key: "status", Value: "running"},
+		filters.KeyValuePair{Key: "label", Value: prometheusEnableScrapeAnnotation + "=" + prometheusEnableScrapeAnnotationValue})
+	containers, err := h.client.ContainerList(context.Background(), types.ContainerListOptions{
+		Filters: f,
+	})
+	if err != nil {
+		log.Warnf("Got an error while listing the containers, err = %v", err)
+		return
+	}
+	containerIds := make([]string, 0, 0)
+	for _, c := range containers {
+		if containerIsManaged(c.Labels) {
+			log.Debugf("Container %s is managed", c.ID)
+			containerIds = append(containerIds, c.ID)
+		}
+	}
+
+	if len(containerIds) > 0 {
+		h.startContainerChan <- containerIds
+	}
+}
+
+func (h *dockerHandler) listenToDockerEvents(ctx context.Context) {
+
+	ctx, cancel := context.WithCancel(context.Background())
+	eventsChan, errsChan := h.client.Events(ctx, types.EventsOptions{})
+
+	defer func() {
+		cancel()
+	}()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case event := <-eventsChan:
+			log.Tracef("Got an event %v", event)
+			if event.Type == dockerEventTypeContainer && event.Action == dockerEventActionStart {
+				log.Infof("Got a start of container %s", event.ID)
+				h.startContainerChan <- []string{event.ID}
+			} else if event.Type == dockerEventTypeContainer && event.Action == dockerEventActionDie {
+				log.Infof("Got a stop of container %s", event.ID)
+				h.stopContainerChan <- []string{event.ID}
+			}
+		case err := <-errsChan:
+			log.Fatalf("Got an error while listening to events, err = %v", err)
+			return
+		}
+	}
+}
+
+func (h *dockerHandler) addContainersToScrapeConfig(containerIds []string) {
+
+	log.Debugf("addContainersToScrapeConfig for %v", containerIds)
+
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	hasContainersAdded := false
+
+	for _, containerId := range containerIds {
+
+		managed, containerScrapeConfig, err := h.findHostPortAndPathForContainer(containerId)
+		if err != nil {
+			log.Warnf("Got an error while getting container %s configuration details, err = %v", containerId, err)
+		} else if managed {
+			_, exists := h.managedContainers[containerId]
+			if !exists {
+				h.managedContainers[containerId] = containerScrapeConfig
+				hasContainersAdded = true
+			}
+		} else {
+			log.Debugf("Container %s is not managed by us, ignoring", containerId)
+		}
+	}
+
+	if hasContainersAdded {
+		err := h.writer.write(h.managedContainers)
+		if err != nil {
+			log.Warnf("Got an error while trying to write the config to the prometheus file, err = %v", err)
+		}
+	}
+}
+
+func (h *dockerHandler) removeContainersFromScrapeConfig(containerIds []string) {
+
+	log.Debugf("removeContainersFromScrapeConfig for %v", containerIds)
+
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	hasContainersRemoved := false
+
+	for _, containerId := range containerIds {
+		_, exists := h.managedContainers[containerId]
+		if exists {
+			delete(h.managedContainers, containerId)
+			hasContainersRemoved = true
+		}
+	}
+
+	if hasContainersRemoved {
+		err := h.writer.write(h.managedContainers)
+		if err != nil {
+			log.Warnf("Got an error while trying to write the config to the prometheus file, err = %v", err)
+		}
+	}
+}
+
+func (h *dockerHandler) findHostPortAndPathForContainer(containerId string) (bool, containerScrapeConfig, error) {
+
+	containerScrapeConfig := containerScrapeConfig{
+		Labels: make(map[string]string),
+	}
+
+	c, err := h.client.ContainerInspect(context.Background(), containerId)
+	if err != nil {
+		log.Warnf("Got an error while inspecting container %s: err = %v", containerId, err)
+		return false, containerScrapeConfig, err
+	}
+
+	if containerIsManaged(c.Config.Labels) {
+
+		// Find port
+		port := getFromMapOrDefault(prometheusPortAnnotation, c.Config.Labels, "")
+		if port == "" {
+			containerPorts := getContainerPortsNetworkConfig(c.NetworkSettings.Ports)
+			if len(containerPorts) != 1 {
+				log.Warnf("Too many port mapped, can't decide which one to pick without more hint... Please set %s annotation to configure the scraping properly.", prometheusPortAnnotation)
+				return false, containerScrapeConfig, nil
+			}
+			if containerPorts[0].Proto() != "tcp" {
+				log.Warnf("The only mapped port is UDP and is not supported by the scraping. Please set %s annotation to configure the scraping properly.", prometheusPortAnnotation)
+				return false, containerScrapeConfig, nil
+			}
+			port = containerPorts[0].Port()
+		}
+
+		// Find ip
+		var ip string
+		network, ok := c.NetworkSettings.Networks[h.config.DockerNetworkName]
+		if ok {
+			ip = network.IPAddress
+		} else {
+			ip = getFromMapOrDefault(prometheusIpAnnotation, c.Config.Labels, "")
+			if ip == "" {
+				if h.config.DockerNetworkStrict {
+					log.Warnf("This container is not attached to %s network. Strict networking is requested, so it can't be scraped.", h.config.DockerNetworkName)
+					return false, containerScrapeConfig, nil
+				}
+
+				log.Infof("This container is not attached to %s network. No guarantee it can be reached by prometheus, but trying the first listed network...", h.config.DockerNetworkName)
+				networks := getNetworkNamesFromNetworks(c.NetworkSettings.Networks)
+				if len(networks) <= 0 {
+					log.Warnf("[BOGUS] No network found at all for this container ?? This container can't be scraped...")
+					return false, containerScrapeConfig, nil
+				}
+				network, ok = c.NetworkSettings.Networks[networks[0]]
+				if !ok {
+					log.Warnf("[BOGUS] Network %s not found for this container ?? This container can't be scraped...", networks[0])
+					return false, containerScrapeConfig, nil
+				}
+				log.Warnf("Network %s got chosen instead of %s... Hope it is reachable from Prometheus", networks[0], h.config.DockerNetworkName)
+				ip = network.IPAddress
+			}
+		}
+		containerScrapeConfig.Targets = append(containerScrapeConfig.Targets, fmt.Sprintf("%s:%s", ip, port))
+
+		// Handle labels
+		// Add common labels. Note they can be overwritten by specific labels from the container itself.
+		for k, v := range h.config.PrometheusCommonLabels {
+			containerScrapeConfig.Labels[k] = v
+		}
+
+		extraLabels := parseCSLabels(getFromMapOrDefault(prometheusExtraLabelsAnnotation, c.Config.Labels, ""))
+		for k, v := range extraLabels {
+			containerScrapeConfig.Labels[k] = v
+		}
+
+		if h.config.PrometheusAddContainerMetadata {
+			containerScrapeConfig.Labels[model.MetaLabelPrefix+"container_id"] = c.ID
+			containerScrapeConfig.Labels[model.MetaLabelPrefix+"container_name"] = c.Name
+		}
+
+		// Find path
+		path := getFromMapOrDefault(prometheusPathAnnotation, c.Config.Labels, "")
+		if path != "" {
+			containerScrapeConfig.Labels[model.MetricsPathLabel] = path
+		}
+
+		// Find scheme
+		scheme := getFromMapOrDefault(prometheusSchemeAnnotation, c.Config.Labels, "")
+		if scheme != "" {
+			containerScrapeConfig.Labels[model.SchemeLabel] = scheme
+		}
+
+		return true, containerScrapeConfig, nil
+	} else {
+		// container is not managed.
+		return false, containerScrapeConfig, nil
+	}
+}
+
+func containerIsManaged(labels map[string]string) bool {
+	enabled, ok := labels[prometheusEnableScrapeAnnotation]
+	return ok &&
+		enabled == prometheusEnableScrapeAnnotationValue
+}
--- a/docker_handler_test.go
+++ b/docker_handler_test.go
@ -0,0 +1,27 @@
+package main
+
+import (
+	"github.com/sqooba/go-common/logging"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestDockerEventsListener(t *testing.T) {
+
+	config := envConfig{
+		PrometheusConfigFilePath: "test-data/from-docker-labels.json",
+		DockerNetworkName:        "bridge",
+		LogLevel:                 "debug",
+		PrometheusCommonLabels:   map[string]string{"c1": "v1"},
+	}
+	err := logging.SetLogLevel(log, config.LogLevel)
+
+	writer, err := newPromFileHandler(config)
+	assert.Nil(t, err)
+
+	dockerHandler, err := newDockerHandler(config, writer)
+	assert.Nil(t, err)
+
+	err = dockerHandler.handle()
+	assert.Nil(t, err)
+}
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,20 @@
+module github.com/touilleio/prometheus-docker-labels-discovery
+
+go 1.15
+
+require (
+	github.com/Microsoft/go-winio v0.4.16 // indirect
+	github.com/containerd/containerd v1.4.3 // indirect
+	github.com/docker/distribution v2.7.1+incompatible // indirect
+	github.com/docker/docker v20.10.1+incompatible
+	github.com/docker/go-connections v0.4.0
+	github.com/docker/go-units v0.4.0 // indirect
+	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.1 // indirect
+	github.com/prometheus/client_golang v1.9.0
+	github.com/prometheus/common v0.15.0
+	github.com/stretchr/testify v1.6.1
+	golang.org/x/sys v0.0.0-20201223074533-0d417f636930 // indirect
+	github.com/sqooba/go-common v0.0.0-20210308210041-34f0d28a008b
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,531 @@
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+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
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+gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
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+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
--- a/main.go
+++ b/main.go
@ -0,0 +1,94 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/kelseyhightower/envconfig"
+	"github.com/sqooba/go-common/logging"
+	"github.com/sqooba/go-common/version"
+	"net/http"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+	"time"
+)
+
+var (
+	setLogLevel = flag.String("set-log-level", "", "Change log level. Possible values are trace,debug,info,warn,error,fatal,panic")
+	log         = logging.NewLogger()
+)
+
+type envConfig struct {
+	Port             string `envconfig:"PORT" default:"8080"`
+	LogLevel         string `envconfig:"LOG_LEVEL" default:"info"`
+	MetricsNamespace string `envconfig:"METRICS_NAMESPACE" default:"dockerlabelsdiscovery"`
+	MetricsSubsystem string `envconfig:"METRICS_SUBSYSTEM" default:""`
+	MetricsPath      string `envconfig:"METRICS_PATH" default:"/metrics"`
+
+	PrometheusConfigFilePath       string            `envconfig:"PROMETHEUS_CONFIG_FILE_PATH"`
+	PrometheusAddContainerMetadata bool              `envconfig:"PROMETHEUS_ADD_CONTAINER_METADATA"`                // adds container_id and container name to the target labels.
+	DockerNetworkName              string            `envconfig:"DOCKER_NETWORK_NAME" default:"monitoring_default"` // docker network to search ip from.
+	DockerNetworkStrict            bool              `envconfig:"DOCKER_NETWORK_STRICT"`                            // Restrict to the DockerNetworkName, or use it as preferred network but try to best effort to find a ip on another network.
+	DockerPollFrequency            time.Duration     `envconfig:"DOCKER_POLL_FREQUENCY" defaults:"5m"`
+	PrometheusCommonLabels         map[string]string `envconfig:"PROMETHEUS_COMMON_LABELS"` // Comma separated key:value to add to all targets.
+}
+
+func main() {
+	log.Println("prometheus-docker-labels-discovery application is starting...")
+	log.Printf("Version    : %s", version.Version)
+	log.Printf("Commit     : %s", version.GitCommit)
+	log.Printf("Build date : %s", version.BuildDate)
+	log.Printf("OSarch     : %s", version.OsArch)
+
+	var env envConfig
+	if err := envconfig.Process("", &env); err != nil {
+		log.Printf("[ERROR] Failed to process env var: %s\n", err)
+		return
+	}
+
+	flag.Parse()
+	err := logging.SetLogLevel(log, env.LogLevel)
+	if err != nil {
+		log.Fatalf("Logging level %s do not seem to be right. Err = %v", env.LogLevel, err)
+	}
+
+	if *setLogLevel != "" {
+		logging.SetRemoteLogLevelAndExit(log, env.Port, *setLogLevel)
+	}
+
+	// Special endpoint to change the verbosity at runtime, i.e. curl -X PUT --data debug ...
+	logging.InitVerbosityHandler(log, http.DefaultServeMux)
+	initPrometheus(env, http.DefaultServeMux)
+	signalChan := make(chan os.Signal, 1)
+	signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
+	var wg sync.WaitGroup
+
+	promFileHandler, err := newPromFileHandler(env)
+	if err != nil {
+		log.Fatalf("Got an exception while initialising prometheus file handler. Err = %v", err)
+	}
+
+	dockerHandler, err := newDockerHandler(env, promFileHandler)
+	if err != nil {
+		log.Fatalf("Got an exception while initialising docker handler. Err = %v", err)
+	}
+	go dockerHandler.handle()
+
+	s := http.Server{Addr: fmt.Sprint(":", env.Port)}
+	go func() {
+		log.Fatal(s.ListenAndServe())
+	}()
+
+	<-signalChan
+	log.Printf("Shutdown signal received, exiting...")
+
+	err = s.Shutdown(context.Background())
+	if err != nil {
+		log.Fatalf("Got an error while shutting down: %v\n", err)
+	}
+
+	// Wait for processing to complete properly
+	wg.Wait()
+}
--- a/metrics.go
+++ b/metrics.go
@ -0,0 +1,51 @@
+package main
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"net/http"
+)
+
+var (
+	counterContainerCheck          prometheus.Counter
+	counterContainerCheckFailure   prometheus.Counter
+	counterContainerRestart        prometheus.Counter
+	counterContainerRestartFailure prometheus.Counter
+)
+
+func initPrometheus(env envConfig, mux *http.ServeMux) {
+
+	counterContainerCheck = prometheus.NewCounter(prometheus.CounterOpts{
+		Name:      "check_count",
+		Help:      "Count how many container checks has been run",
+		Namespace: env.MetricsNamespace,
+		Subsystem: env.MetricsSubsystem,
+	})
+	prometheus.MustRegister(counterContainerCheck)
+
+	counterContainerCheckFailure = prometheus.NewCounter(prometheus.CounterOpts{
+		Name:      "check_failure_count",
+		Help:      "Count how many container check failures happened",
+		Namespace: env.MetricsNamespace,
+		Subsystem: env.MetricsSubsystem,
+	})
+	prometheus.MustRegister(counterContainerCheckFailure)
+
+	counterContainerRestart = prometheus.NewCounter(prometheus.CounterOpts{
+		Name:      "restart_count",
+		Help:      "Count how many container restarts has been run",
+		Namespace: env.MetricsNamespace,
+		Subsystem: env.MetricsSubsystem,
+	})
+	prometheus.MustRegister(counterContainerRestart)
+
+	counterContainerRestartFailure = prometheus.NewCounter(prometheus.CounterOpts{
+		Name:      "restart_failure_count",
+		Help:      "Count how many container restart failures happened",
+		Namespace: env.MetricsNamespace,
+		Subsystem: env.MetricsSubsystem,
+	})
+	prometheus.MustRegister(counterContainerRestartFailure)
+
+	mux.Handle(env.MetricsPath, promhttp.Handler())
+}
--- a/overall-diagram.png
+++ b/overall-diagram.png
--- a/prom_file_handler.go
+++ b/prom_file_handler.go
@ -0,0 +1,50 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"strings"
+	"syscall"
+)
+
+type promHandler struct {
+	config envConfig
+}
+
+func newPromFileHandler(config envConfig) (*promHandler, error) {
+
+	if !strings.HasSuffix(config.PrometheusConfigFilePath, ".json") {
+		return nil, fmt.Errorf("file dose not have .json extension")
+	}
+
+	err := syscall.Access(config.PrometheusConfigFilePath, syscall.O_RDWR)
+	if err != nil {
+		return nil, err
+	}
+
+	handler := &promHandler{
+		config: config,
+	}
+
+	return handler, nil
+}
+
+func (h *promHandler) write(containersScrapeConfig map[string]containerScrapeConfig) error {
+
+	targetGroups := make([]containerScrapeConfig, 0, len(containersScrapeConfig))
+	for _, v := range containersScrapeConfig {
+		targetGroups = append(targetGroups, v)
+	}
+	data, err := json.Marshal(targetGroups)
+	if err != nil {
+		return err
+	}
+	log.Debugf("Write %s to %s", string(data), h.config.PrometheusConfigFilePath)
+	err = ioutil.WriteFile(h.config.PrometheusConfigFilePath, data, 0644)
+	if err != nil {
+		return err
+	}
+
+	return err
+}
--- a/utils.go
+++ b/utils.go
@ -0,0 +1,54 @@
+package main
+
+import (
+	"github.com/docker/docker/api/types/network"
+	"github.com/docker/go-connections/nat"
+	"strings"
+)
+
+func getFromMapOrDefault(key string, m map[string]string, defaultValue string) string {
+	v, ok := m[key]
+	if ok {
+		return v
+	} else {
+		return defaultValue
+	}
+}
+
+func getContainerPortsNetworkConfig(ports nat.PortMap) []nat.Port {
+	keys := make([]nat.Port, len(ports))
+	i := 0
+	for p := range ports {
+		keys[i] = p
+		i++
+	}
+	return keys
+}
+
+func getNetworkNamesFromNetworks(m map[string]*network.EndpointSettings) []string {
+	keys := make([]string, len(m))
+	i := 0
+	for k := range m {
+		keys[i] = k
+		i++
+	}
+	return keys
+}
+
+// parseCSLabels parses a string of the format k1:v1,k2:k2,...
+func parseCSLabels(labels string) map[string]string {
+	m := make(map[string]string)
+	if labels == "" {
+		return m
+	}
+	ss := strings.Split(labels, ",")
+	for _, pair := range ss {
+		z := strings.Split(pair, ":")
+		if len(z) < 2 {
+			m[z[0]] = ""
+		} else {
+			m[z[0]] = strings.Join(z[1:], ":")
+		}
+	}
+	return m
+}