Sveiki visi. Gegužės mėnesį pradeda veikti OTUS
Apylinkės
Mums reikės šių dalykų:
- Kubernetes
- Prometėjas operatorius
Eksportuotojo juodosios dėžės konfigūracija
„Blackbox“ konfigūravimas per ConfigMap
nustatymams http
interneto paslaugų stebėjimo modulis.
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
Modulis http_2xx
naudojamas patikrinti, ar žiniatinklio paslauga pateikia HTTP 2xx būsenos kodą. Blackbox eksportuotojo konfigūracija išsamiau aprašyta
„Blackbox“ eksportuotojo diegimas „Kubernetes“ klasteryje
Apibūdinti Deployment
и Service
dislokavimui 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 eksportuotoją galima įdiegti naudojant šią komandą. Vardų erdvė monitoring
nurodo Prometheus operatorių.
kubectl --namespace=monitoring apply -f blackbox-exporter.yaml
Įsitikinkite, kad visos paslaugos veikia naudodami šią komandą:
kubectl --namespace=monitoring get all --selector=app=prometheus-blackbox-exporter
Blackbox patikrinimas
Blackbox eksportuotojo žiniatinklio sąsają galite pasiekti naudodami port-forward
:
kubectl --namespace=monitoring port-forward svc/prometheus-blackbox-exporter 9115:9115
Prisijunkite prie Blackbox eksportuotojo žiniatinklio sąsajos naudodami žiniatinklio naršyklę adresu
Jei einate adresu
Metrinė vertė probe_success
lygus 1 reiškia sėkmingą patikrinimą. 0 reikšmė rodo klaidą.
„Prometėjo“ nustatymas
Įdiegę „BlackBox“ eksportuotoją, sukonfigūruojame „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.
Mes generuojame Secret
naudodami šią komandą.
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
Mes nurodome additional-scrape-configs
Prometheus Operator naudojant additionalScrapeConfigs
.
kubectl --namespace=monitoring edit prometheuses k8s
...
spec:
additionalScrapeConfigs:
key: prometheus-additional.yaml
name: additional-scrape-configs
Einame į „Prometheus“ žiniatinklio sąsają ir patikriname metrikas bei tikslus.
kubectl --namespace=monitoring port-forward svc/prometheus-k8s 9090:9090
Matome Blackbox metrikas ir tikslus.
Pranešimų taisyklių pridėjimas (įspėjimas)
Norėdami gauti pranešimus iš „Blackbox“ eksportuotojo, „Prometheus Operator“ pridėsime taisykles.
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: {{ $labels }}"
„Prometheus“ žiniatinklio sąsajoje eikite į Būsena => Taisyklės ir raskite „blackbox-exporter“ įspėjimų taisykles.
„Kubernetes“ API serverio SSL sertifikato galiojimo pabaigos pranešimų konfigūravimas
Sukonfigūruokime Kubernetes API serverio SSL sertifikato galiojimo pabaigos stebėjimą. Jis siųs pranešimus kartą per savaitę.
„Blackbox“ eksportuotojo modulio pridėjimas Kubernetes API serverio autentifikavimui.
kubectl --namespace=monitoring edit configmap prometheus-blackbox-exporter
...
kube-api:
http:
method: GET
no_follow_redirects: false
preferred_ip_protocol: ip4
tls_config:
insecure_skip_verify: false
ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
valid_http_versions:
- HTTP/1.1
- HTTP/2
valid_status_codes: []
prober: http
timeout: 5s
Pridedama Prometheus grandymo konfigūracija
- job_name: 'kube-api-blackbox'
metrics_path: /probe
params:
module: [kube-api]
static_configs:
- targets:
- https://kubernetes.default.svc/api
relabel_configs:
- source_labels: [__address__]
target_label: __param_target
- source_labels: [__param_target]
target_label: instance
- target_label: __address__
replacement: prometheus-blackbox-exporter:9115 # The blackbox exporter.
Naudojant Prometheus Secret
PROMETHEUS_ADD_CONFIG=$(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
Įspėjimo taisyklių pridėjimas
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 }}"
Naudingos nuorodos
Šaltinis: www.habr.com