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Benoit Perroud 2021-02-02 21:21:12 +01:00
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11
Dockerfile Normal file
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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

47
Makefile Normal file
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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)

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README.md Normal file
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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,...` |

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docker_handler.go Normal file
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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
}

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docker_handler_test.go Normal file
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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)
}

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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
)

531
go.sum Normal file
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@ -0,0 +1,531 @@
bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
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=
github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
github.com/Microsoft/go-winio v0.4.15-0.20200113171025-3fe6c5262873 h1:93nQ7k53GjoMQ07HVP8g6Zj1fQZDDj7Xy2VkNNtvX8o=
github.com/Microsoft/go-winio v0.4.15-0.20200113171025-3fe6c5262873/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
github.com/Microsoft/go-winio v0.4.16 h1:FtSW/jqD+l4ba5iPBj9CODVtgfYAD8w2wS923g/cFDk=
github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
github.com/Microsoft/hcsshim v0.8.9 h1:VrfodqvztU8YSOvygU+DN1BGaSGxmrNfqOv5oOuX2Bk=
github.com/Microsoft/hcsshim v0.8.9/go.mod h1:5692vkUqntj1idxauYlpoINNKeqCiG6Sg38RRsjT5y8=
github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
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golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
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golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191004110552-13f9640d40b9 h1:rjwSpXsdiK0dV8/Naq3kAw9ymfAeJIyd0upUIElB+lI=
golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20200625001655-4c5254603344 h1:vGXIOMxbNfDTk/aXCmfdLgkrSV+Z2tcbze+pEc3v5W4=
golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181026203630-95b1ffbd15a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190514135907-3a4b5fb9f71f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
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google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
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google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
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google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
google.golang.org/grpc v1.26.0 h1:2dTRdpdFEEhJYQD8EMLB61nnrzSCTbG38PhqdhvOltg=
google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.29.1 h1:EC2SB8S04d2r73uptxphDSUG+kTKVgjRPF+N3xpxRB4=
google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
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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=

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main.go Normal file
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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()
}

51
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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())
}

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50
prom_file_handler.go Normal file
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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
}

54
utils.go Normal file
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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
}