Elastic APM server http://localhost:8220/ is not available (Server returned status 400)

Elastic Observability APM
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5

I'm sorry (newbie here), there was no error. I eventually realized I did not create an APM server. I was contacting the Fleet Server instead of the APM server. I thought the APM server was embedded in the fleet docker, at that time I had not correctly understood the architecture.

I added an APM docker in the stack, and it worked. Thank you for you answers.

For reference, the docker-compose.yml file (using data from apm-server/testing/docker at main · elastic/apm-server · GitHub stored in a folder called configuration) .

version: '3.9'
services:
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:8.8.0-ba3f07b2-SNAPSHOT
    ports:
      - 9200:9200
    healthcheck:
      test: ["CMD-SHELL", "curl -s http://localhost:9200/_cluster/health?wait_for_status=yellow&timeout=500ms"]
      retries: 300
      interval: 1s
    environment:
      - "ES_JAVA_OPTS=-Xms1g -Xmx1g"
      - "network.host=0.0.0.0"
      - "transport.host=127.0.0.1"
      - "http.host=0.0.0.0"
      - "cluster.routing.allocation.disk.threshold_enabled=false"
      - "discovery.type=single-node"
      - "xpack.security.authc.anonymous.roles=remote_monitoring_collector"
      - "xpack.security.authc.realms.file.file1.order=0"
      - "xpack.security.authc.realms.native.native1.order=1"
      - "xpack.security.enabled=true"
      - "xpack.license.self_generated.type=trial"
      - "xpack.security.authc.token.enabled=true"
      - "xpack.security.authc.api_key.enabled=true"
      - "logger.org.elasticsearch=${ES_LOG_LEVEL:-error}"
      - "action.destructive_requires_name=false"
    volumes:
      - "./configuration/elasticsearch/roles.yml:/usr/share/elasticsearch/config/roles.yml"
      - "./configuration/elasticsearch/users:/usr/share/elasticsearch/config/users"
      - "./configuration/elasticsearch/users_roles:/usr/share/elasticsearch/config/users_roles"
      - "./configuration/elasticsearch/ingest-geoip:/usr/share/elasticsearch/config/ingest-geoip"

  kibana:
    image: docker.elastic.co/kibana/kibana:8.8.0-ba3f07b2-SNAPSHOT
    ports:
      - 5601:5601
    healthcheck:
      test: ["CMD-SHELL", "curl -s http://localhost:5601/api/status | grep -q 'All services are available'"]
      retries: 300
      interval: 1s
    environment:
      ELASTICSEARCH_HOSTS: '["http://elasticsearch:9200"]'
      ELASTICSEARCH_USERNAME: "${KIBANA_ES_USER:-kibana_system_user}"
      ELASTICSEARCH_PASSWORD: "${KIBANA_ES_PASS:-changeme}"
      XPACK_FLEET_AGENTS_FLEET_SERVER_HOSTS: '["https://fleet-server:8220"]'
      XPACK_FLEET_AGENTS_ELASTICSEARCH_HOSTS: '["http://elasticsearch:9200"]'
    depends_on:
      elasticsearch: { condition: service_healthy }
    volumes:
      - "./configuration/kibana/kibana.yml:/usr/share/kibana/config/kibana.yml"

  fleet-server:
    image: docker.elastic.co/beats/elastic-agent:8.8.0-ba3f07b2-SNAPSHOT
    ports:
      - 8220:8220
    healthcheck:
      test: ["CMD-SHELL", "curl -s -k https://localhost:8220/api/status | grep -q 'HEALTHY'"]
      retries: 300
      interval: 1s
    environment:
      FLEET_SERVER_ENABLE: "1"
      FLEET_SERVER_POLICY_ID: "fleet-server-apm"
      FLEET_SERVER_ELASTICSEARCH_HOST: http://elasticsearch:9200
      FLEET_SERVER_ELASTICSEARCH_USERNAME: "${ES_SUPERUSER_USER:-admin}"
      FLEET_SERVER_ELASTICSEARCH_PASSWORD: "${ES_SUPERUSER_PASS:-changeme}"
      FLEET_SERVER_CERT: /etc/pki/tls/certs/fleet-server.pem
      FLEET_SERVER_CERT_KEY: /etc/pki/tls/private/fleet-server-key.pem
      FLEET_URL: https://fleet-server:8220
      KIBANA_FLEET_SETUP: "true"
      KIBANA_FLEET_HOST: "http://kibana:5601"
      KIBANA_FLEET_USERNAME: "${ES_SUPERUSER_USER:-admin}"
      KIBANA_FLEET_PASSWORD: "${ES_SUPERUSER_PASS:-changeme}"
    depends_on:
      elasticsearch: { condition: service_healthy }
      kibana: { condition: service_healthy }
    volumes:
      - "./configuration/fleet-server/certificate.pem:/etc/pki/tls/certs/fleet-server.pem"
      - "./configuration/fleet-server/key.pem:/etc/pki/tls/private/fleet-server-key.pem"

  apm-server:
    image: docker.elastic.co/apm/apm-server:8.6.2
    cap_add: ["CHOWN", "DAC_OVERRIDE", "SETGID", "SETUID"]
    cap_drop: ["ALL"]
    ports:
      - 8200:8200
    command: >
      apm-server -e
        -E apm-server.rum.enabled=true
        -E setup.kibana.host=kibana:5601
        -E setup.template.settings.index.number_of_replicas=0
        -E apm-server.kibana.enabled=true
        -E apm-server.kibana.host=http://kibana:5601
        -E apm-server.kibana.username=${ES_SUPERUSER_USER:-admin}
        -E apm-server.kibana.password=${ES_SUPERUSER_PASS:-changeme}
        -E output.elasticsearch.hosts=["http://elasticsearch:9200"]
        -E output.elasticsearch.username=${KIBANA_ES_USER:-apm_server_user}
        -E output.elasticsearch.password=${KIBANA_ES_PASS:-changeme}
    healthcheck:
      interval: 10s
      retries: 12
      test: curl --write-out 'HTTP %{http_code}' --fail --silent --output /dev/null http://localhost:8200/
    depends_on:
      elasticsearch: { condition: service_healthy }
      kibana: { condition: service_healthy }

  metricbeat:
    image: docker.elastic.co/beats/metricbeat:8.8.0-ba3f07b2-SNAPSHOT
    environment:
      ELASTICSEARCH_HOSTS: '["http://elasticsearch:9200"]'
      ELASTICSEARCH_USERNAME: "${KIBANA_ES_USER:-admin}"
      ELASTICSEARCH_PASSWORD: "${KIBANA_ES_PASS:-changeme}"
    depends_on:
      elasticsearch: { condition: service_healthy }
      fleet-server: { condition: service_healthy }
    volumes:
      - "./configuration/metricbeat/elasticsearch-xpack.yml://usr/share/metricbeat/modules.d/elasticsearch-xpack.yml"
      - "./configuration/metricbeat/apm-server.yml://usr/share/metricbeat/modules.d/apm-server.yml"
    profiles:
      - monitoring
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