🥇Prometheus: HTTP yekutarisa kuburikidza neBlackbox kunze kwenyika

Mhoroi mose. Muna Chivabvu OTUS inotanga musangano wekutarisa nekutema matanda, zvese zvivakwa uye maapplication anoshandisa Zabbix, Prometheus, Grafana uye ELK. Panyaya iyi, isu tinongogara tichigovana zvinhu zvinobatsira pamusoro wenyaya.

Blackbox mutengesi kunze yePrometheus inobvumidza iwe kuita yekutarisa yekunze masevhisi kuburikidza neHTTP, HTTPS, DNS, TCP, ICMP. Muchikamu chino, ini ndinokuratidza maitiro ekumisikidza HTTP/HTTPS yekutarisa uchishandisa Blackbox kunze kwenyika. Isu tichavhura iyo Blackbox mutengesi kunze muKubernetes.

Nzvimbo

Tichada zvinotevera:

Kubernetes
Prometheus Operator

Exporter blackbox configuration

Kugadzirisa Blackbox kuburikidza ConfigMap yegadziriro http web services monitoring module.

apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-blackbox-exporter
  labels:
    app: prometheus-blackbox-exporter
data:
  blackbox.yaml: |
    modules:
      http_2xx:
        http:
          no_follow_redirects: false
          preferred_ip_protocol: ip4
          valid_http_versions:
          - HTTP/1.1
          - HTTP/2
          valid_status_codes: []
        prober: http
        timeout: 5s

Module http_2xx inoshandiswa kutarisa kuti sevhisi yewebhu inodzosa HTTP 2xx mamiriro kodhi. Iyo blackbox exporter gadziriso inotsanangurwa zvakadzama mu zvinyorwa.

Kuendesa kunze kwebhokisi dema kune Kubernetes cluster

Rondedzera Deployment и Service kuti iendeswe kuKubernetes.

---
kind: Service
apiVersion: v1
metadata:
  name: prometheus-blackbox-exporter
  labels:
    app: prometheus-blackbox-exporter
spec:
  type: ClusterIP
  ports:
    - name: http
      port: 9115
      protocol: TCP
  selector:
    app: prometheus-blackbox-exporter

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus-blackbox-exporter
  labels:
    app: prometheus-blackbox-exporter
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus-blackbox-exporter
  template:
    metadata:
      labels:
        app: prometheus-blackbox-exporter
    spec:
      restartPolicy: Always
      containers:
        - name: blackbox-exporter
          image: "prom/blackbox-exporter:v0.15.1"
          imagePullPolicy: IfNotPresent
          securityContext:
            readOnlyRootFilesystem: true
            runAsNonRoot: true
            runAsUser: 1000
          args:
            - "--config.file=/config/blackbox.yaml"
          resources:
            {}
          ports:
            - containerPort: 9115
              name: http
          livenessProbe:
            httpGet:
              path: /health
              port: http
          readinessProbe:
            httpGet:
              path: /health
              port: http
          volumeMounts:
            - mountPath: /config
              name: config
        - name: configmap-reload
          image: "jimmidyson/configmap-reload:v0.2.2"
          imagePullPolicy: "IfNotPresent"
          securityContext:
            runAsNonRoot: true
            runAsUser: 65534
          args:
            - --volume-dir=/etc/config
            - --webhook-url=http://localhost:9115/-/reload
          resources:
            {}
          volumeMounts:
            - mountPath: /etc/config
              name: config
              readOnly: true
      volumes:
        - name: config
          configMap:
            name: prometheus-blackbox-exporter

Blackbox exporter inogona kutumirwa uchishandisa unotevera kuraira. Namespace monitoring zvinoreva Prometheus Operator.

kubectl --namespace=monitoring apply -f blackbox-exporter.yaml

Ita shuwa kuti masevhisi ese ari kushanda uchishandisa murairo unotevera:

kubectl --namespace=monitoring get all --selector=app=prometheus-blackbox-exporter

Blackbox cheki

Unogona kuwana iyo Blackbox exporter web interface uchishandisa port-forward:

kubectl --namespace=monitoring port-forward svc/prometheus-blackbox-exporter 9115:9115

Batanidza kuBlackbox exporter web interface kuburikidza newebhu browser pa localhost: 9115.

Kana ukaenda kukero http://localhost:9115/probe?module=http_2xx&target=https://www.google.com, iwe uchaona mhedzisiro yekutarisa iyo yakatarwa URL (https://www.google.com).

Metric kukosha probe_success kuenzana ne1 zvinoreva cheki yakabudirira. Huwandu hwe0 hunoratidza kukanganisa.

Kugadzira Prometheus

Mushure mekuendesa kunze kweBlackBox, isu tinogadzirisa Prometheus mukati prometheus-additional.yaml.

- job_name: 'kube-api-blackbox'
  scrape_interval: 1w
  metrics_path: /probe
  params:
    module: [http_2xx]
  static_configs:
   - targets:
      - https://www.google.com
      - http://www.example.com
      - https://prometheus.io
  relabel_configs:
   - source_labels: [__address__]
     target_label: __param_target
   - source_labels: [__param_target]
     target_label: instance
   - target_label: __address__
     replacement: prometheus-blackbox-exporter:9115 # The blackbox exporter.

Isu tinogadzira Secretuchishandisa murairo unotevera.

PROMETHEUS_ADD_CONFIG=$(cat prometheus-additional.yaml | base64)
cat << EOF | kubectl --namespace=monitoring apply -f -
apiVersion: v1
kind: Secret
metadata:
  name: additional-scrape-configs
type: Opaque
data:
  prometheus-additional.yaml: $PROMETHEUS_ADD_CONFIG
EOF

Tinoratidza additional-scrape-configs yePrometheus Operator uchishandisa additionalScrapeConfigs.

kubectl --namespace=monitoring edit prometheuses k8s
...
spec:
  additionalScrapeConfigs:
    key: prometheus-additional.yaml
    name: additional-scrape-configs

Isu tinoenda kuPrometheus web interface uye tarisa metrics uye zvinangwa.

kubectl --namespace=monitoring port-forward svc/prometheus-k8s 9090:9090

Isu tinoona metric uye zvinangwa zveBlackbox.

Kuwedzera mitemo yezviziviso (yambiro)

Kuti ugamuchire zviziviso kubva kuBlackbox mutengesi, isu tichawedzera mitemo kuPrometheus Operator.

kubectl --namespace=monitoring edit prometheusrules prometheus-k8s-rules
...
  - name: blackbox-exporter
    rules:
    - alert: ProbeFailed
      expr: probe_success == 0
      for: 5m
      labels:
        severity: error
      annotations:
        summary: "Probe failed (instance {{ $labels.instance }})"
        description: "Probe failedn  VALUE = {{ $value }}n  LABELS: {{ $labels }}"
    - alert: SlowProbe
      expr: avg_over_time(probe_duration_seconds[1m]) > 1
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "Slow probe (instance {{ $labels.instance }})"
        description: "Blackbox probe took more than 1s to completen  VALUE = {{ $value }}n  LABELS: {{ $labels }}"
    - alert: HttpStatusCode
      expr: probe_http_status_code <= 199 OR probe_http_status_code >= 400
      for: 5m
      labels:
        severity: error
      annotations:
        summary: "HTTP Status Code (instance {{ $labels.instance }})"
        description: "HTTP status code is not 200-399n  VALUE = {{ $value }}n  LABELS: {{ $labels }}"
    - alert: SslCertificateWillExpireSoon
      expr: probe_ssl_earliest_cert_expiry - time() < 86400 * 30
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "SSL certificate will expire soon (instance {{ $labels.instance }})"
        description: "SSL certificate expires in 30 daysn  VALUE = {{ $value }}n  LABELS: {{ $labels }}"
    - alert: SslCertificateHasExpired
      expr: probe_ssl_earliest_cert_expiry - time()  <= 0
      for: 5m
      labels:
        severity: error
      annotations:
        summary: "SSL certificate has expired (instance {{ $labels.instance }})"
        description: "SSL certificate has expired alreadyn  VALUE = {{ $value }}n  LABELS: {{ $labels }}"
    - alert: HttpSlowRequests
      expr: avg_over_time(probe_http_duration_seconds[1m]) > 1
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "HTTP slow requests (instance {{ $labels.instance }})"
        description: "HTTP request took more than 1sn  VALUE = {{ $value }}n  LABELS: {{ $labels }}"
    - alert: SlowPing
      expr: avg_over_time(probe_icmp_duration_seconds[1m]) > 1
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "Slow ping (instance {{ $labels.instance }})"
        description: "Blackbox ping took more than 1sn  VALUE = {{ $value }}n  LABELS: {{ $labels }}"

MuPrometheus web interface, enda kuMamiriro => Mitemo uye uwane mitemo yekuchenjerera yebhokisi-exporter.

Kugadzirisa Kubernetes API Server SSL Setifiketi Yekupera Kwenguva Zviziviso

Ngatigadzirise Kubernetes API Server SSL cheti kupera kwekutarisa. Ichatumira zviziviso kamwe pasvondo.

Kuwedzera iyo Blackbox yekunze module yeKubernetes API Server Authentication.

kubectl --namespace=monitoring edit configmap prometheus-blackbox-exporter
...
      kube-api:
        http:
          method: GET
          no_follow_redirects: false
          preferred_ip_protocol: ip4
          tls_config:
            insecure_skip_verify: false
            ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
          bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
          valid_http_versions:
          - HTTP/1.1
          - HTTP/2
          valid_status_codes: []
        prober: http
        timeout: 5s

Kuwedzera Prometheus scrape kumisikidza

- job_name: 'kube-api-blackbox'
  metrics_path: /probe
  params:
    module: [kube-api]
  static_configs:
   - targets:
      - https://kubernetes.default.svc/api
  relabel_configs:
   - source_labels: [__address__]
     target_label: __param_target
   - source_labels: [__param_target]
     target_label: instance
   - target_label: __address__
     replacement: prometheus-blackbox-exporter:9115 # The blackbox exporter.

Kushandisa Prometheus Chakavanzika

PROMETHEUS_ADD_CONFIG=$(cat prometheus-additional.yaml | base64)
cat << EOF | kubectl --namespace=monitoring apply -f -
apiVersion: v1
kind: Secret
metadata:
  name: additional-scrape-configs
type: Opaque
data:
  prometheus-additional.yaml: $PROMETHEUS_ADD_CONFIG
EOF

Kuwedzera mitemo yekuchenjerera

kubectl --namespace=monitoring edit prometheusrules prometheus-k8s-rules
...
  - name: k8s-api-server-cert-expiry
    rules:
    - alert: K8sAPIServerSSLCertExpiringAfterThreeMonths
      expr: probe_ssl_earliest_cert_expiry{job="kube-api-blackbox"} - time() < 86400 * 90 
      for: 1w
      labels:
        severity: warning
      annotations:
        summary: "Kubernetes API Server SSL certificate will expire after three months (instance {{ $labels.instance }})"
        description: "Kubernetes API Server SSL certificate expires in 90 daysn  VALUE = {{ $value }}n  LABELS: {{ $labels }}"

Useful links

Kuongorora uye kutema matanda muDocker

Source: www.habr.com