open prometheus.yml: no such file or directory"

[maitri chattopadhyay]

Hi,

this is the first time I am using prometheus. Please feel free to ask questions if I miss out some crucial explanation.

I am trying to install and run the prometheus server from Terminal on my Mac.

1. I installed prometheus using brew.

2. I checked the version to verify its installed. 

3. Next I navigated in to the prometheus folder. 

4. Now I am trying to start the server by using the command:  prometheus --config.file="prometheus.yml" 

This is the error I got:  

err="error loading config from \"prometheus.yml\": couldn't load configuration (--config.file=\"prometheus.yml\"): open prometheus.yml: no such file or directory"

 My understanding is that there is a default sample prometheus.yml file  when the app is installed. What m I doing wrong? 

I would also like to make changes to this file. How do I locate it and make the changes?

[Hrishikesh Barman]

Hi, 

1. I installed prometheus using brew.

2. I checked the version to verify its installed. 

3. Next I navigated in to the prometheus folder. 

4. Now I am trying to start the server by using the command:  prometheus --config.file="prometheus.yml" 

You need to put the prometheus.yml file somewhere and specify it using the `--config.file`  flag.

Example prometheus.yml file: https://github.com/prometheus/prometheus/blob/master/documentation/examples/prometheus.yml

[maitri chattopadhyay]

Thanks for the link. 

I created a prometheus.yml file and configured it  as following. 

#Global configurations

global:

  scrape_interval:     5s # Set the scrape interval to every 5 seconds.

  evaluation_interval: 5s # Evaluate rules every 5 seconds.

scrape_configs:

  - job_name: 'prometheus'

    metrics_path: '/actuator/prometheus'

    static_configs:

      - targets: ['localhost:8080']

Now when I hit the url http://localhost:8080/graph, I get the following error.

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Dec 25 00:13:02 PST 2018

There was an unexpected error (type=Not Found, status=404).

No message available

What am I missing?

 

[Julius Volz]

Hi Maitri,

You need to use the flag "--config.file=/etc/prometheus/prometheus.yml" to make Prometheus use the configuration file you created in /etc/prometheus/prometheus.yml. Indeed, our official release archives contain a default configuration file, but I don't know how Brew installs Prometheus (Prometheus people are not involved in that). By default, if you do not provide the --config.file flag, Prometheus will look for a "prometheus.yml" in the current working directory.

As to your question about localhost:8080/graph - That is your target's hostname and port, not the Prometheus server's. Prometheus will start up on port 9090 by default, so try http://localhost:9090/.

Cheers,

Julius

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[maitri chattopadhyay]

Hi Julius,

 

I am inside the prometheus folder. If I use the command  : prometheus --config.file=/etc/prometheus/prometheus.yml , I am getting the following error. 

level=error ts=2018-12-26T18:41:25.915715Z caller=main.go:624 err="error loading config from \"/etc/prometheus/prometheus.yml\": couldn't load configuration (--config.file=\"/etc/prometheus/prometheus.yml\"): open /etc/prometheus/prometheus.yml: no such file or directory"

So, I now I used  prometheus --config.file="prometheus.yml"  to start the server. the server started successfully, But it says listening to port 9090. While I have mentioned the port to be 8080 i the yml file. 

level=info ts=2018-12-26T18:42:09.380736Z caller=web.go:429 component=web msg="Start listening for connections" address=0.0.0.0:9090.

Since there was no prometheus.yml file before I created one, how is it still listening to 9090?