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#ResourceBilling API This api queries prometheus and calculates resource usages for the desired container.

Prometheus Queries

####CPU usage between two timestamps

sum by (name) (container_cpu_usage_seconds_total{ container_label_com_docker_swarm_service_name=~".*devops_prometheus.*", container_label_com_docker_stack_namespace=~".*devops.*"} offset 16806s)-(sum by (name) (container_cpu_usage_seconds_total{ container_label_com_docker_swarm_service_name=~".*devops_prometheus.*", container_label_com_docker_stack_namespace=~".*devops.*"} offset 17406s))

####RAM usage summary between two timestamps in desired resolution

sum_over_time(container_memory_usage_bytes{container_label_com_docker_swarm_service_name=~".*devops_prometheus.*", container_label_com_docker_stack_namespace=~".*devops.*"}[17406s:1h]) -sum_over_time(container_memory_usage_bytes{container_label_com_docker_swarm_service_name=~".*devops_prometheus.*", container_label_com_docker_stack_namespace=~".*devops.*"}[16806s:1h])

Function Documentation

PrometheusOperator object includes all the funtions for calculation resource usages. It gets prometheus root url from environment variable 'prom_addr'

####get_cpu_total(label_name, label_value, t1, t2) #####This function calculates the total cpu before t2 and t1 seperately and returns the difference.

  • label_name: Label for querying prometheus, for example "container_label_com_docker_swarm_service_name"
  • label_value: Desired value for your desired label, for example "my_docker_service"
  • t1 - t2: Resource usage will be calculated for the time between two timestamps, t2 should be bigger than t1.

#####get_network_transmit_total and get_network_receive_total functions works same as get_cpu_total function. ####get_ram_total(label_name, label_value, t1, t2, resolution) #####This function takes samples in desired resolution and returns the sum of them.

  • label_name: Label for querying prometheus, for example "container_label_com_docker_swarm_service_name"
  • label_value: Desired value for your desired label, for example "my_docker_service"
  • t1 - t2: Resource usage will be calculated for the time between two timestamps, t2 should be bigger than t1.
  • resolution: As container ram usage is not a cumulative function (it returns current usage), we calculate total ram usage by taking samples in desired resolution. It should be given as prometheus's time format (1s, 1m, 2h)

#####get_disk_total function works same as the get_ram_total function. ####WARNING! Resolution must be less than the difference between t2 and t1 in order to getting a meaningful result.

##Docker Build

docker build -t resourcebilling:latest .

Run

docker run --network=host -e prom_addr=http://58.18.155.36:9090 -it resourcebilling:latest

##Sample Request http://127.0.0.1:8000/?label_name=container_label_com_docker_swarm_service_name&label_value=devops_prometheus&label_name2=container_label_com_docker_stack_namespace&label_value2=devops&resolution=1h&t1=1595939855&t2=1595940455

Postman Screenshot