Prometheus：利用consul监控Nginx

$ k run ng --image nginx:1.21.6

$ k get po  | grep ng

ng                                       1/1     Running   0              14s

$ kubectl exec -it ng -- bash
root@ng:/# apt update
root@ng:/# apt install -y vim

$ kubectl exec -it ng -- bash
root@ng:/# vi /etc/nginx/conf.d/default.conf

    location /nginx_status {
        stub_status;
    }

root@ng:/# nginx  -s reload

$ curl localhost/nginx_status

Active connections: 1
server accepts handled requests
 1 1 1
Reading: 0 Writing: 1 Waiting: 0

$ helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
$ helm repo update
$ helm pull prometheus-community/prometheus-nginx-exporter  --untar

$ kubectl get po -o wide | grep ^ng

ng                                       1/1     Running   0                9h      172.27.14.203    k8s-node02     <none>           <none>

$ cd prometheus-nginx-exporter
$ vi  values.yaml

$ helm install prometheus-nginx-exporter .

$ kubectl get po | grep nginx-exporter

prometheus-nginx-exporter-5d7444f6df-s8xzg   1/1     Running   0              3m6s

$ kubectl get svc | grep nginx-exporter

prometheus-nginx-exporter    ClusterIP      10.0.31.168    <none>        9113/TCP                                                         3m37s

$ curl 10.0.31.168:9113/metrics

HELP nginx_connections_accepted Accepted client connections
TYPE nginx_connections_accepted counter
nginx_connections_accepted 3
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 3
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 3
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{arch="linux/amd64",commit="e4a6810d4f0b776f7fde37fea1d84e4c7284b72a",date="2022-09-07T21:09:51Z",dirty="false",go="go1.19",version="0.11.0"} 1

$ kubectl get svc |grep consul

prometheus-consul-headless   ClusterIP      None           <none>        8500/TCP,8400/TCP,8301/TCP,8301/UDP,8300/TCP,8600/TCP,8600/UDP   2m9s
prometheus-consul-ui         ClusterIP      10.0.195.154   <none>        80/TCP                                                           2m9s

$ curl -X PUT -d '{"id": "test-ng","name": "test-nginx","address": "10.0.31.168","port": 9113,"tags": ["service"],"checks": [{"http": "http://10.0.31.168:9113/","interval": "5s"}]}' http://10.0.195.154/v1/agent/service/register

$ curl 10.0.195.154/v1/catalog/service/test-nginx

[{"ID":"441285d8-c8d5-ab7a-d1fe-e2fab2b608f9","Node":"prometheus-consul-1","Address":"172.17.125.32","Datacenter":"dc1","TaggedAddresses":{"lan":"172.17.125.32","lan_ipv4":"172.17.125.32","wan":"172.17.125.32","wan_ipv4":"172.17.125.32"},"NodeMeta":{"consul-network-segment":"","consul-version":"1.16.2"},"ServiceKind":"","ServiceID":"test-ng","ServiceName":"test-nginx","ServiceTags":["service"],"ServiceAddress":"10.0.31.168","ServiceTaggedAddresses":{"lan_ipv4":{"Address":"10.0.31.168","Port":9113},"wan_ipv4":{"Address":"10.0.31.168","Port":9113}},"ServiceWeights":{"Passing":1,"Warning":1},"ServiceMeta":{},"ServicePort":9113,"ServiceSocketPath":"","ServiceEnableTagOverride":false,"ServiceProxy":{"Mode":"","MeshGateway":{},"Expose":{}},"ServiceConnect":{},"ServiceLocality":null,"CreateIndex":4651,"ModifyIndex":4651}