如何在 prometheus 中安装和抓取 Nginx 和 mssql 的指标

Question

I am trying to setup prometheus monitoring tool for a project. While I am able to configure prometheus to scrape server metrics with node_exporter and DNS with blackbox_exporter, I am having a hard time setting up metrics for Nginx and MsSQL in prometheus. I will appreciate any resources or walk through to get the exporter for both as well as the installation process for prometheus to scrape data. The project is hosted on digital ocean cloud.

Answer 1

Both appear straightforward:

1. The NGINX exporter
2. The official Microsoft SQL Server exporter

Please update your question and explain:

• Exactly what you tried (include code and config)
• What errors you received

Example

This would be better under eg Docker Compose but...

nginx.conf :

events {
    use           epoll;
    worker_connections  128;
}

http {
    server {
        location = /basic_status {
                stub_status;
        }
    }
}

Run NGINX (defaults to :80 ):

docker run \
--interactive --tty --rm \
--net=host \
--volume=${PWD}/nginx.conf:/etc/nginx/nginx.conf:ro \
nginx

Test it:

curl \
--request GET \
http://localhost/basic_status

Run Exporter:

docker run \
--interactive --tty --rm \
--net=host \
nginx/nginx-prometheus-exporter \
  -nginx.scrape-uri=http://localhost/basic_status 

Test it:

curl \
--request GET \
http://localhost:9113/metrics

Yields:

# HELP nginx_connections_accepted Accepted client connections
# TYPE nginx_connections_accepted counter
nginx_connections_accepted 1
# HELP nginx_connections_active Active client connections
# TYPE nginx_connections_active gauge
nginx_connections_active 1
# HELP nginx_connections_handled Handled client connections
# TYPE nginx_connections_handled counter
nginx_connections_handled 1
# HELP nginx_connections_reading Connections where NGINX is reading the request header
# TYPE nginx_connections_reading gauge
nginx_connections_reading 0
# HELP nginx_connections_waiting Idle client connections
# TYPE nginx_connections_waiting gauge
nginx_connections_waiting 0
# HELP nginx_connections_writing Connections where NGINX is writing the response back to the client
# TYPE nginx_connections_writing gauge
nginx_connections_writing 1
# HELP nginx_http_requests_total Total http requests
# TYPE nginx_http_requests_total counter
nginx_http_requests_total 2
# HELP nginx_up Status of the last metric scrape
# TYPE nginx_up gauge
nginx_up 1
# HELP nginxexporter_build_info Exporter build information
# TYPE nginxexporter_build_info gauge
nginxexporter_build_info{commit="5f88afbd906baae02edfbab4f5715e06d88538a0",date="2021-03-22T20:16:09Z",version="0.9.0"} 1

prometheus.yml :

scrape_configs:
  # Self
  - job_name: "prometheus-server"
    static_configs:
      - targets:
          - "localhost:9090"

  # NGINX
  - job_name: "nginx"
    static_configs:
      - targets:
          - "localhost:9113"

Then:

docker run \
--interactive --tty --rm \
--net=host \
--volume=${PWD}/prometheus.yml:/etc/prometheus/prometheus.yml \
prom/prometheus:v2.26.0 \
  --config.file=/etc/prometheus/prometheus.yml

Then:

Targets:

Graph: