🥇Prometheus: Tekolo ea HTTP ka morekisi oa Blackbox

Lumelang bohle. Ka May OTUS e qala workshop ea ho beha leihlo le ho rema lifate, bobeli ba lisebelisoa le lisebelisoa tse sebelisang Zabbix, Prometheus, Grafana le ELK. Tabeng ena, ka tloaelo re arolelana lintho tse molemo ka taba ena.

Blackbox morekisi bakeng sa Prometheus e u lumella ho kenya ts'ebetsong ho lekola lits'ebeletso tsa kantle ka HTTP, HTTPS, DNS, TCP, ICMP. Sehloohong sena, ke tla u bontša mokhoa oa ho theha tlhahlobo ea HTTP/HTTPS u sebelisa Blackbox exporter. Re tla qala morekisi oa Blackbox ho Kubernetes.

Tikoloho

Re tla hloka tse latelang:

Kubernetes
Moemeli oa Prometheus

Tlhophiso ea lebokose le letšo la kantle

Ho lokisa Blackbox ka ConfigMap bakeng sa di-setting http Mojule oa tlhokomelo ea lits'ebeletso tsa webo.

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 e sebelisetsoang ho hlahloba hore na tšebeletso ea websaete e khutlisetsa khoutu ea boemo ba HTTP 2xx. Sebopeho sa blackbox exporter se hlalositsoe ka botlalo ho litokomane.

Ho romela morekisi oa lebokose le letšo ho sehlopha sa Kubernetes

Hlalosa Deployment и Service bakeng sa ho romelloa Kubernetes.

---
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 e ka sebelisoa ho sebelisa taelo e latelang. Sebaka sa mabitso monitoring e bua ka Prometheus Operator.

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

Etsa bonnete ba hore litšebeletso tsohle li sebetsa u sebelisa taelo e latelang:

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

Blackbox hlahloba

U ka fihlella sebopeho sa webo sa Blackbox u sebelisa port-forward:

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

Hokela ho Blackbox exporter web interface ka sebatli sa marang-rang ho Localhost: 9115.

Haeba u ea atereseng http://localhost:9115/probe?module=http_2xx&target=https://www.google.com, u tla bona sephetho sa ho hlahloba URL e boletsoeng (https://www.google.com).

Boleng ba metric probe_success lekana le 1 bolela katleho hlahloba. Boleng ba 0 bo bontša phoso.

Ho theha Prometheus

Kamora ho romella morekisi oa BlackBox, re hlophisa Prometheus ho 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.

Re hlahisa Secretho sebelisa taelo e latelang.

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

Re bontša additional-scrape-configs bakeng sa Prometheus Operator sebelisa additionalScrapeConfigs.

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

Re ea ho Prometheus web interface mme re hlahlobe metrics le lipakane.

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

Re bona metrics le lipakane tsa Blackbox.

Ho kenya melao bakeng sa litsebiso (temoso)

Ho amohela litemoso ho tsoa ho morekisi oa Blackbox, re tla eketsa melao ho 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 }}"

Sebakeng sa marang-rang sa Prometheus, e-ea ho Boemo => Melao 'me u fumane melao ea tlhokomeliso bakeng sa blackbox-exporter.

Ho Lokisa Litsebiso tsa Phello ea Nako ea Setifikeiti sa Kubernetes API sa SSL

Ha re lokiseng tlhahlobo ea ho felloa ke nako ea setifikeiti sa Kubernetes API Server SSL. E tla romela litsebiso hang ka beke.

E kenyelletsa mojule oa kantle ho Blackbox bakeng sa Tiisetso ea Seva ea Kubernetes API.

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

Ho eketsa tlhophiso ea Prometheus scrape

- 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.

Ho sebelisa Lekunutu la Prometheus

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

Ho eketsa melao ea tlhokomeliso

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 }}"

likhokahano tse sebetsang

Ho beha leihlo le ho rema lifate ho Docker

Source: www.habr.com

Prometheus: Tlhahlobo ea HTTP ka Blackbox exporter