How to configure Prometheus scrape targets when running in Docker on a Synology NAS

[anders....@gmail.com]

Hi,

I have installed Docker on my Synology DS918+ NAS and added the prom/prometheus package and got Prometheus up and running. From the web interface in Prometheus I can click on "Status" in the menu bar and then "Configuration" to reveal the following default config:

global:
  scrape_interval: 15s
  scrape_timeout: 10s
  evaluation_interval: 15s
alerting:
  alertmanagers:
  - static_configs:
    - targets: []
    scheme: http
    timeout: 10s
scrape_configs:
- job_name: prometheus
  scrape_interval: 15s
  scrape_timeout: 10s
  metrics_path: /metrics
  scheme: http
  static_configs:
  - targets:
    - localhost:9090

From the web interface it is not possible to change what is written in the configuration file which means I am not able to add my desired scrape targets. How can I access the configuration file and edit it? Please keep in mind that I am very new to Prometheus and I have never used it or Docker before.

I appreciate any help I can get. Thank you!

//Anders

[Chris Marchbanks]

Hello Anders,

The prometheus configuration is a file on disk that you will need to mount into your docker container. Please see the installation documentation for docker (https://prometheus.io/docs/prometheus/latest/installation/#using-docker), especially the "Volumes & bind-mount" section for instruction on how to do this.

Let me know if you have more questions,

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Chris Marchbanks | Engineer

FreshTracks.io - Intelligent Alerting for Kubernetes and Prometheus

[anders....@gmail.com]

Dear Chris,

Thank you for your answer. My problem right now is that I do not know the exact path to the configuration file. I would also like to know how to mount this folder in the docker container?

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[Chris Marchbanks]

You will have to create a local copy of a configuration file on your computer, then use the -v flag in your docker command to bind-mount your local copy of the configuration file into your running docker container. This is done using the -v docker command with the syntax "-v <path-to-local-configuration-file>:<destination-path-in-docker>". You can read more about using bind-mounts in the docker documentation: https://docs.docker.com/storage/bind-mounts/

The example in the Prometheus documentation I linked uses "-v /tmp/prometheus.yml:/etc/prometheus/prometheus.yml" which translates to mount a configuration file located on your computer at "/tmp/prometheus.yml" into the docker container at "/etc/prometheus/prometheus.yml", which is the default location prometheus looks for a configuration file.

Hope that helps,

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