🥇Prometheus: Mataʻituina HTTP e ala i le Blackbox exporter

Talofa uma. Ia Me OTUS fa'alauiloa mafutaga faaleaoaoga i le mataituina ma le taina o laau, mea uma e lua ma faʻaoga e faʻaaoga ai Zabbix, Prometheus, Grafana ma ELK. I lenei tulaga, matou te masani ona faʻasoa mea aoga i luga o le autu.

Pusauliuli fa'atau atu mo Prometheus faʻatagaina oe e faʻatino le mataʻituina o auaunaga i fafo e ala i HTTP, HTTPS, DNS, TCP, ICMP. I lenei tusiga, o le a ou faʻaali atu ia te oe pe faʻafefea ona faʻatulagaina le mataʻituina o HTTP / HTTPS e faʻaaoga ai le Blackbox exporter. O le a matou faʻalauiloaina le Blackbox faʻatau atu i fafo i Kubernetes.

Le siosiomaga

Matou te manaʻomia mea nei:

Kubernetes
Prometheus Operator

Fa'atonuga pusa uliuli a le tagata fa'atau atu i fafo

Fa'atulagaina le Blackbox e ala i ConfigMap mo faatulagaga http 'au'aunaga i luga ole laiga module mata'ituina.

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

Faiga http_2xx fa'aaoga e siaki ai o le 'au'aunaga i luga ole laiga e toe fa'afo'i mai le HTTP 2xx fa'ailoga tulaga. O lo'o fa'amatala au'ili'ili le fa'atulagaina o le pusa uliuli i fafo fa'amaumauga.

Tu'uina atu o se pusa uliuli e fa'atau atu i fafo i se vaega Kubernetes

Faamatala Deployment и Service mo le faʻapipiʻiina i 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

O le Blackbox exporter e mafai ona faʻaogaina e faʻaaoga ai le poloaiga lenei. Avanoa igoa monitoring e faasino i le Prometheus Operator.

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

Ia mautinoa o loʻo faʻaogaina uma auaunaga e faʻaaoga ai le poloaiga lenei:

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

Siaki Blackbox

E mafai ona e mauaina le Blackbox exporter web interface fa'aaoga port-forward:

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

Feso'ota'i i le Blackbox exporter web interface e ala i se upegatafa'ilagi ile localhost: 9115.

Afai e te alu i le tuatusi http://localhost:9115/probe?module=http_2xx&target=https://www.google.com, o le a e vaʻai i le iʻuga o le siakiina o le URL faʻamaonia (https://www.google.com).

Tau fa'atatau probe_success tutusa ma le 1 o lona uiga o siaki manuia. Ole tau ole 0 e ta'u mai ai se mea sese.

Faʻatulagaina o Prometheus

A maeʻa ona tuʻuina atu le BlackBox faʻatau atu, matou te faʻatulagaina Prometheus i totonu 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.

Matou te gaosia Secretfa'aaoga le poloaiga lenei.

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

Fa'ailoa mai additional-scrape-configs mo Prometheus Operator faʻaaogaina additionalScrapeConfigs.

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

Matou te o atu i le Prometheus web interface ma siaki fua ma sini.

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

Matou te vaʻai i metric ma sini a Blackbox.

Fa'aopoopo tulafono mo fa'amatalaga (talata)

Ina ia maua faʻamatalaga mai le Blackbox exporter, matou te faʻaopoopo tulafono ile 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 }}"

I le Prometheus web interface, alu ile Tulaga => Tulafono ma su'e tulafono mataala mo le blackbox-eksporter.

Fa'atulagaina o Kubernetes API Server SSL Tusi Fa'ailo Fa'aaliga Fa'amutaina

Sei o tatou fetuutuunai le Kubernetes API Server SSL mataituina le mutaaga o tusi faamaonia. O le a auina atu faʻamatalaga faʻatasi i le vaiaso.

Fa'aopoopoina le vaega o le Blackbox exporter module mo Kubernetes 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

Fa'aopoopoina le fa'atulagaina o le 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.

Faʻaaogaina o le Prometheus Secret

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

Fa'aopoopo tulafono mataala

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 }}"

aoga fesoʻotaʻiga

Mataʻituina ma saini i totonu Docker

puna: www.habr.com