Using HAProxy as an API Gateway, Part 4 Metrics

blog20210208-01.cfg

frontend stats
   bind :8404
   stats enable
   stats uri /
   stats refresh 10s

blog20210208-02.cfg

global
    stats socket /var/run/haproxy.sock user haproxy group haproxy mode 660 level admin

blog20210208-03.cfg

global
    stats socket ipv4@127.0.0.1:9999 user haproxy group haproxy mode 660 level admin

blog20210208-04.sh

$ echo "show stat json" | socat tcp-connect:127.0.0.1:9999 - | python3 -m json.tool

blog20210208-05.sh

$ watch 'echo "show stat" | socat tcp-connect:127.0.0.1:9999 - | cut -d "," -f 1-2,16,18,43,44,47,61 | column -s, -t'

# pxname  svname        wretr  status  hrsp_4xx  hrsp_5xx  req_rate  rtime
fe_api    FRONTEND  OPEN   0          0           10
be_api    s1        0      UP         0           0         4
be_api    s2        0      UP         0           0         4
be_api    s3        0      UP         0           0         5
be_api    s4        0      UP         0           0         5
be_api    s5        0      UP         0           0         5
be_api    BACKEND    0      UP         0           0         4

blog20210208-06.sh

$ haproxy -vv | grep "Prometheus exporter"

Built with the Prometheus exporter as a service

blog20210208-07.cfg

frontend stats
   bind :8404
   stats enable
   stats uri /
   stats refresh 5s
   http-request use-service prometheus-exporter if { path /metrics }

blog20210208-08.yml

global:
 scrape_interval:     5s
 evaluation_interval: 5s

scrape_configs:
 - job_name: 'haproxy'
   static_configs:
     - targets: ['172.25.0.11:8404']

blog20210208-09.cfg

global
    stats socket ipv4@*:9999 user haproxy group haproxy mode 660 level admin

blog20210208-10.sh

$ metricbeat modules enable haproxy

blog20210208-11.yml

output.elasticsearch:
  hosts: ["172.25.0.19:9200"]

blog20210208-12.yml

- module: haproxy
  metricsets: ["info", "stat"]
  period: 10s
  hosts: ["tcp://172.25.0.11:9999"]
  enabled: true

blog20210208-13.sh

$ sudo service metricbeat start