A complete guide to deployment, logging, distributed tracing, performance, and monitoring metrics, including cluster health.
Hello, Habr. As part of the course "Microservice Architecture" we have prepared a translation of the material for you.
We also invite you to an open webinar on the topic "Distributed message queues using the example of kafka."
Looking for observable microservices but don't yet know how to implement them with Kubernetes? Well ... maybe this is the article you were looking for.
First, let's understand what observability is. This term originated in control systems engineering and was defined as "a measure of how well the internal states of a system can be determined based on information about its external outputs." In simple terms, observability implies adequate understanding of the system to facilitate corrective action.
Observability rests on three pillars:
() : , . (events) , .
(): /, . / .
: , . .
— Kubernetes?
— Kubernetes-
, .
, .
Weather-front: , . .
Weather-services: , API .
Weather-db: Maria, , .
(Deployment object) Kubernetes, — kubectl get deploy
.
, .
Weather-front:
- image: brainupgrade/weather:microservices-front imagePullPolicy: Always name: weather-front
Weather-services:
- image: brainupgrade/weather-services:2.0.0
imagePullPolicy: Always
name: weather-services
Weather-db:
- image: mariadb:10.3
name: mariadb
ports:
- containerPort: 3306
name: mariadb
— —
, EFK: Elasticsearch, Fluentd Kibana. .
Elasticsearch Kibana:
helm repo add elastic https://helm.elastic.co
helm repo update
helm install --name elasticsearch elastic/elasticsearch --set replicas=1 --namespace elasticsearch
helm install --name kibana elastic/kibana
Fluentd:
containers:
- name: fluentd
imagePullPolicy: "Always"
image: fluent/fluentd-kubernetes-daemonset:v1.12.0-debian-elasticsearch7-1.0
env:
- name: FLUENT_ELASTICSEARCH_HOST
value: "elasticsearch-master.elasticsearch.svc.cluster.local"
- name: FLUENT_ELASTICSEARCH_PORT
value: "9200"
Kibana, :
Fluentd (Fluentd Daemonset - 4):
Elasticsearch. Kibana:
«» , — .
— — ()
(distributed tracing) — Java-, Zipkin, Jaeger, Elasticsesarch APM . .
EFK, APM, Elasticsearch. -, APM Kubernetes Deployment.
Elastic APM:
containers:
- name: apm-server
image: docker.elastic.co/apm/apm-server:7.5.0
ports:
- containerPort: 8200
name: apm-port
APM , APM . , weather-front. weather-services.
APM weather-front:
initContainers:
- name: elastic-java-agent
image: docker.elastic.co/observability/apm-agent-java:1.12.0
volumeMounts:
- mountPath: /elastic/apm/agent
name: elastic-apm-agent
command: ['cp', '-v', '/usr/agent/elastic-apm-agent.jar', '/elastic/apm/agent']
containers:
- image: brainupgrade/weather:microservices-front
imagePullPolicy: Always
name: weather-front
volumeMounts:
- mountPath: /elastic/apm/agent
name: elastic-apm-agent
env:
- name: ELASTIC_APM_SERVER_URL
value: "http://apm-server.elasticsearch.svc.cluster.local:8200"
- name: ELASTIC_APM_SERVICE_NAME
value: "weather-front"
- name: ELASTIC_APM_APPLICATION_PACKAGES
value: "in.brainupgrade"
- name: ELASTIC_APM_ENVIRONMENT
value: prod
- name: ELASTIC_APM_LOG_LEVEL
value: DEBUG
- name: JAVA_TOOL_OPTIONS
value: -javaagent:/elastic/apm/agent/elastic-apm-agent.jar
, Observability -> APM console Kibana, , ( 6).
, weather-front, :
, , , , (trace Sample) . .
, weather-front weather-services. Trace Sample, (transaction details).
Actions .
, «» .
— —
«», , APM, (Latency), (Throughput) (Error rate).
, Spring Boot Prometheus Actuator . Prometheus Grafana, :
Prometheus Grafana:
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo add grafana https://grafana.github.io/helm-charts
helm repo update
helm install --name prometheus prometheus-community/prometheus
helm install --name grafana grafana/grafana
Prometheus Grafana , :
template:
metadata:
labels:
app: weather-services
annotations:
prometheus.io/scrape: "true"
prometheus.io/port: "8888"
prometheus.io/path: /actuator/prometheus
containers:
- image: brainupgrade/weather-services:2.0.0
imagePullPolicy: Always
name: weather-services
volumeMounts:
- mountPath: /elastic/apm/agent
name: elastic-apm-agent
env:
- name: management.endpoints.web.exposure.include
value: "*"
- name: spring.application.name
value: weather-services
- name: management.server.port
value: "8888"
- name: management.metrics.web.server.request.autotime.enabled
value: "true"
- name: management.metrics.tags.application
value: weather-services
Grafana, id 12685 , . weather-front:
