Promql demo service

Demo service

---

In order to show you in as much detail as possible PromQL Index query , Here we will Fork An open source Prometheus Demo service to query , This allows us to control the indicator data more flexibly , Project warehouse address ：https://github.com/cnych/prometheus_demo_service, This is a Go Language development services , We can build our own applications .

First of all to prepare golang Environmental Science ：

 * wget https://golang.org/dl/go1.16.3.linux-amd64.tar.gz
 * rm -rf /usr/local/go && tar -C /usr/local -xzf go1.16.3.linux-amd64.tar.gz
#  Configure environment variables , You can add the following command to  /etc/profile  in 
 * export PATH=$PATH:/usr/local/go/bin
#  perform go Command to verify 
 * go version
go version go1.16.3 linux/amd64

  then clone The code to build ： Start preparing to build the project

#  First clone Code ( It is recommended to use ssh Pattern , You'll see ~)
 * git clone https://github.com/cnych/prometheus_demo_service
 * cd prometheus_demo_service
#  To configure  GOPROXY  agent 
 * export GOPROXY=https://goproxy.cn
#  structure 
 * env GOOS=linux GOARCH=amd64 go build -o prometheus_demo_service   // Compile 



[[email protected] prometheus_demo_service]# ls
api.go    client.go  crossbuild.sh  Dockerfile  go.sum      intermittent_metric.go  memory.go
batch.go  cpu.go     disk.go        go.mod      holiday.go  main.go                 prometheus_demo_service

 This is a binary program compiled and packaged , It can be started directly 

 The listening port is 8080 
[[email protected] prometheus_demo_service]# ./prometheus_demo_service 


[[email protected] ~]# netstat -tpln | grep 8080
tcp6       0      0 :::8080                 :::*                    LISTEN      20916/./prometheus_ 

# HELP demo_api_http_requests_in_progress The current number of API HTTP requests in progress.
# TYPE demo_api_http_requests_in_progress gauge
demo_api_http_requests_in_progress 1


# HELP demo_api_request_duration_seconds A histogram of the API HTTP request durations in seconds.
# TYPE demo_api_request_duration_seconds histogram
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0001"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.00015000000000000001"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.00022500000000000002"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0003375"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.00050625"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.000759375"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0011390624999999999"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0017085937499999998"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0025628906249999996"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0038443359374999994"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.00576650390625"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.008649755859375"} 0
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.0129746337890625"} 22
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.01946195068359375"} 600
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.029192926025390625"} 612
demo_api_request_duration_seconds_bucket{method="GET",path="/api/bar",status="200",le="0.043789389038085935"} 660

Start after the build 3 A service , Monitor separately 10000、10001、10002 port ：

[[email protected] ~]# netstat -tpln | grep 1000
tcp6       0      0 :::10000                :::*                    LISTEN      26720/./prometheus_ 
tcp6       0      0 :::10001                :::*                    LISTEN      27270/./prometheus_ 
tcp6       0      0 :::10002                :::*                    LISTEN      27326/./prometheus_ 



[[email protected] prometheus_demo_service]# nohup ./prometheus_demo_service --listen-address=:10000 &
[1] 26720
[[email protected] prometheus_demo_service]# nohup: ignoring input and appending output to ?.ohup.out?

[[email protected] prometheus_demo_service]# nohup ./prometheus_demo_service --listen-address=:10001 &
[2] 27270
[[email protected] prometheus_demo_service]# nohup: ignoring input and appending output to ?.ohup.out?

[[email protected] prometheus_demo_service]# 
[[email protected] prometheus_demo_service]# nohup ./prometheus_demo_service --listen-address=:10002 &
[3] 27326

above 3 All services are  /metrics  The endpoint exposes some indicator data , We can put this 3 Services are configured to Prometheus Crawling task , In this way, these services can be used later PromQL Query description .

complete  prometheus.yml  The configuration file is shown below ：

global:
  scrape_interval: 5s #  Grab frequency 

scrape_configs:
  - job_name: "prometheus"
    static_configs:
      - targets: ["localhost:9090"]
  #  To configure demo Grab task 
  - job_name: demo
    scrape_interval: 15s   // Will be covered global Global configuration for 
    scrape_timeout: 10s
    static_configs:
      - targets:
          - demo-service-0:10000
          - demo-service-1:10001
          - demo-service-2:10002