https://github.com/trivago/scalad

Horizontal Job Autoscaler for Nomad
https://github.com/trivago/scalad

Last synced: about 1 month ago
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Horizontal Job Autoscaler for Nomad

• Host: GitHub
• URL: https://github.com/trivago/scalad
• Owner: trivago
• License: apache-2.0
• Created: 2019-08-19T13:21:34.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2023-08-16T02:54:18.000Z (about 1 year ago)
• Last Synced: 2024-04-26T06:34:03.842Z (5 months ago)
• Language: Go
• Size: 387 KB
• Stars: 69
• Watchers: 8
• Forks: 8
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        






Env variables:

*    `PORT = "80"`: Port on which the application is going to be listening.

*    `NOMAD_HOST = "http://nomad.service.consul:4646"`: Nomad host endpoint.

*    `NOMAD_REGION = "global"`: Nomad Region.

*    `VAULT_TOKEN = "ljkasdflkjafd"`: Token for vault with permission to access every secret needed for all the scale jobs.

*    `USE_SLACK = "true"`: Flag to enable the use of slack as a system message application.

*    `HTTP_USER = "user"`: User needed for basic auth for endpoints to scale up or down manually.

*    `HTTP_PASS = "password"`: Password needed for basic auth for endpoints to scale up or down manually

*    `METRICS_ENDPOINT = "http://prometheus.yourorg.com/api/v1/query?query="`: Endpoint from where to get the metrics which are going to be used to triger the scale events.

Inside Job file (At taskGroup lvl):

````

meta {

    scaler = "true" Activate the scaler

    min_query = "sum(rate(nomad_client_allocs_cpu_total_ticks{exported_job='scaler-test'}[1m]))by(exported_job) < bool 1" Query that gives the Min threshold for scaling down

    max_query = "sum(rate(nomad_client_allocs_cpu_total_ticks{exported_job='scaler-test'}[1m]))by(exported_job) > bool 2" Query that gives the Max threshold for scaling up

    query_fire_time = "2m" Time the query need to be true before triggering the saling event

    scale_cooldown_down = "20s" Time in cooldown for a scale dow event

    scale_cooldown_up = "25s" Time in cooldown for a scale up event

    scale_count_down = "1" Amount of containers that are going to be removed on a scale down event

    scale_count_up = "2" Amount of containers that are going to be added on a scale up event

    scale_max = "16" Maximun amount of containers

    scale_min = "1" Minimun amount amount of containers

}

````