Getting error "Get http://localhost:9443/metrics: dial tcp 127.0.0.1:9443: connect: connection refused"

I'm trying to configure Prometheus and Grafana with my Hyperledger fabric v1.4 network to analyze the peer and chaincode mertics. I've mapped peer container's port 9443 to my host machine's port 9443 after following this documentation. I've also changed the provider entry to prometheus under metrics section in core.yml of peer. I've configured prometheus and grafana in docker-compose.yml in the following way.

  prometheus:
    image: prom/prometheus:v2.6.1
    container_name: prometheus
    volumes:
    - ./prometheus/:/etc/prometheus/
    - prometheus_data:/prometheus
    command:
    - '--config.file=/etc/prometheus/prometheus.yml'
    - '--storage.tsdb.path=/prometheus'
    - '--web.console.libraries=/etc/prometheus/console_libraries'
    - '--web.console.templates=/etc/prometheus/consoles'
    - '--storage.tsdb.retention=200h'
    - '--web.enable-lifecycle'
    restart: unless-stopped
    ports:
    - 9090:9090
    networks:
    - basic
    labels:
    org.label-schema.group: "monitoring"

  grafana:
    image: grafana/grafana:5.4.3
    container_name: grafana
    volumes:
    - grafana_data:/var/lib/grafana
    - ./grafana/datasources:/etc/grafana/datasources
    - ./grafana/dashboards:/etc/grafana/dashboards
    - ./grafana/setup.sh:/setup.sh
    entrypoint: /setup.sh
    environment:
    - GF_SECURITY_ADMIN_USER={ADMIN_USER}
    - GF_SECURITY_ADMIN_PASSWORD={ADMIN_PASS}
    - GF_USERS_ALLOW_SIGN_UP=false
    restart: unless-stopped
    ports:
    - 3000:3000
    networks:
    - basic
    labels:
    org.label-schema.group: "monitoring"

When I curl 0.0.0.0:9443/metrics on my remote centos machine, I get all the list of metrics. However, when I run Prometheus with the above configuration, it throws the error Get http://localhost:9443/metrics: dial tcp 127.0.0.1:9443: connect: connection refused. This is what my prometheus.yml looks like.

global:
  scrape_interval:     15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    scrape_interval: 10s
    static_configs:
      - targets: ['localhost:9090']

  - job_name: 'peer_metrics'
    scrape_interval: 10s
    static_configs:
      - targets: ['localhost:9443']

Even, when I go to endpoint http://localhost:9443/metrics in my browser, I get all the metrics. What am I doing wrong here. How come Prometheus metrics are being shown on its interface and not peer's?

Solution

Your prometheus container isn't running on host network. It's running on its own bridge (the one created by docker-compose). Therefore the scrape config for peer should point at the IP of the peer container.

Recommended way of solving this:

Run prometheus and grafana in the same network as the fabric network. In you docker-compose for prometheus stack you can reference it like this:

networks:
  default:
    external:
      name: <your-hyperledger-network>

(use docker network ls to find the network name )

Then you can use http://<peer_container_name>:9443 in your scrape config