Get current logged in user in linux system

[dibya ranjan mishra]

How to get current logged in user(s) in a linux system using prometheus node exporter

[Ben Kochie]

This sounds like a job for a textfile exporter. There are several examples[0] in the node_exporter repo.

[0]: https://github.com/prometheus/node_exporter/tree/master/text_collector_examples

On Mon, Aug 20, 2018 at 9:11 AM dibya ranjan mishra <dibyami...@gmail.com> wrote:

How to get current logged in user(s) in a linux system using prometheus node exporter

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[dibya ranjan mishra]

Ya I have done that

using the following command

 lastlog -b 0 -t 100 |awk '{if (NR!=1){$2=$3=""; print $0}}

I have setup a cron job and able to write into a .prom file

 file contains list of users and their login info

file content:

usr1   Mon Aug 20 12:00:09 +0530 2018

but when I am trying to run node exporter it is showing  

text format parsing error in line 1: expected float as value, got "Mon"  source="textfile.go:212"

[Christian Hoffmann]

On 8/20/18 11:02 AM, dibya ranjan mishra wrote:
> I have setup a cron job and able to write into a .prom file
>  file contains list of users and their login info
> file content:
> usr1   Mon Aug 20 12:00:09 +0530 2018

This does not look like the Prometheus metrics format, which would be
required for the textfile collector to work.

You probably would want something like:
lastlog{user="usr1"} 1234567 [Unix timestamp of the given Date]

Further reading/examples:
https://github.com/prometheus/node_exporter/tree/master/text_collector_examples
https://www.robustperception.io/quick-sensor-metrics-with-the-textfile-collector
https://prometheus.io/docs/concepts/data_model/

You should probably also be wary of putting high-cardinality labels such
as usernames into your metrics. If this is about tens of users, it's
probably ok. If the number of users is potentially unlimited, you may
run into problems.

> but when I am trying to run node exporter it is showing  
> text format parsing error in line 1: expected float as value, got "Mon" 
> source="textfile.go:212"

If the above example is the actual content of the file, this is likely
the issue here. If not, have you tried comparing the cron-generated
.prom file with your expected output?

Running the script via cron may influence environment variables. If I
were to guess, your parsing might rely on a non-English local while the
cronjob runs with LC_ALL=C and as such English, which would break the
awk-based parsing.

Kind regards,
Christian

[dibya ranjan mishra]

Thank you so much for replying
No, The users won't be much maximum 10-15.
Currently I am parsing using awk and the format that I am storing the data is

users{usr1:"time as string", usr2:"time as string"} 1

When I query users in prometheus server, it is returning the above string.
Is there any better way of doing this?

[Nicholas Capo]

You need `=` instead of `:`, try this format:

    users{usr1="time as string", usr2="time as string"} 1

Nicholas

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[dibya ranjan mishra]

Hi Nicholas,

How to show this list of users in grafana dashboard ?