ProHoster > Ibhulogi > Ulawulo > Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Molweni nonke. NgoMeyi i-OTUS iqalisa iworkshop yokubeka iliso kunye nokugawulwa kwemithi, zombini iziseko kunye nezicelo ezisebenzisa i-Zabbix, i-Prometheus, i-Grafana kunye ne-ELK. Kulo mba, ngokwesiko sabelana ngezinto eziluncedo ngesihloko.

Umthumeli webhokisi emnyama yePrometheus ikuvumela ukuba uqalise ukubeka iliso kwiinkonzo zangaphandle ngeHTTP, HTTPS, DNS, TCP, ICMP. Kweli nqaku, ndiya kukubonisa indlela yokuseta esweni HTTP/HTTPS usebenzisa Blackbox ngaphandle. Siza kusungula umthengisi we-Blackbox kwi-Kubernetes.

Yendalo

Siya kufuna oku kulandelayo:

  • Kubernetes
  • Umqhubi wePrometheus

Uqwalaselo lwebhokisi emnyama yangaphandle

Ukuqwalasela i-Blackbox nge ConfigMap ukulungiselela useto http Imodyuli yokubeka iliso kwiinkonzo zewebhu.

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

Imodyuli http_2xx isetyenziselwa ukujonga ukuba inkonzo yewebhu ibuyisela ikhowudi yesimo seHTTP 2xx. Uqwalaselo lomthumeli webhokisi emnyama luchazwa ngokweenkcukacha ngakumbi kwi amaxwebhu.

Ukuthumela i-blackbox ukuthumela ngaphandle kwiqela le-Kubernetes

Chaza Deployment ΠΈ Service ukusasazwa eKubernetes.

---
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

Umthumeli we-Blackbox unokumiselwa ngokusebenzisa lo myalelo ulandelayo. Indawo yamagama monitoring ibhekisa kwiPrometheus Operator.

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

Qinisekisa ukuba zonke iinkonzo ziyasebenza usebenzisa lo myalelo ulandelayo:

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

Khangela ibhokisi emnyama

Ungafikelela kujongano lwewebhu yeBlackbox usebenzisa port-forward:

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

Qhagamshela kujongano lwewebhu lwe-Blackbox usebenzisa ibhrawuza yewebhu ku localhost: 9115.

Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Ukuba uya kwidilesi http://localhost:9115/probe?module=http_2xx&target=https://www.google.com, uya kubona isiphumo sokujonga i-URL ekhankanyiweyo (https://www.google.com).

Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Ixabiso lemetrikhi probe_success elilingana no-1 lithetha ukujonga ngempumelelo. Ixabiso lika-0 libonisa impazamo.

Ukumisela iPrometheus

Emva kokuthumela ngaphandle kwe-BlackBox, siqwalasela i-Prometheus 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.

Sivelisa Secretusebenzisa lo myalelo ulandelayo.

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

Chaza additional-scrape-configs kuba Prometheus Operator usebenzisa additionalScrapeConfigs.

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

Siya kwi-interface ye-Prometheus yewebhu kwaye sijonge i-metrics kunye neenjongo.

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

Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Sibona iimetrics kunye neenjongo zeBlackbox.

Ukongeza imithetho yezaziso (isilumkiso)

Ukufumana izaziso ezivela kumthengisi we-Blackbox, siya kongeza imithetho kwi-Prometheus 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 }}"

Kwi-interface yewebhu ye-Prometheus, yiya kwi-Status => Imithetho kwaye ufumane imigaqo yokulumkisa kwi-blackbox-exporter.

Prometheus: esweni HTTP ngokusebenzisa Blackbox ngaphandle

Ukuqwalasela i-Kubernetes API Server SSL yoPhelelo lweZaziso zeSatifikethi

Masiqwalasele i-Kubernetes API Server ye-SSL yokuphelelwa lixesha kohlolo. Iza kuthumela izaziso kanye ngeveki.

Ukongeza imodyuli yomthengisi we-Blackbox ye-Kubernetes API Server Ungqinisiso.

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

Ukongeza iPrometheus scrape uqwalaselo

- 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.

Ukusebenzisa iMfihlo yePrometheus

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

Ukongeza imithetho yesilumkiso

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 }}"

amakhonkco aluncedo

Ukubeka iliso kunye nokungena kwiDocker

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