# Env variable on metricbeat.yml
**URL:** https://discuss.elastic.co/t/env-variable-on-metricbeat-yml/279394
**Category:** Beats
**Tags:** metricbeat
**Created:** [July 22, 2021, 1:53pm UTC](https://discuss.elastic.co/t/env-variable-on-metricbeat-yml/279394 "2021-07-22T13:53:46Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@elasticforme](https://discuss.elastic.co/u/elasticforme)
#### Post date: [July 22, 2021, 1:53pm UTC](https://discuss.elastic.co/t/env-variable-on-metricbeat-yml/279394/1 "2021-07-22T13:53:46Z")
In metricbeat I am trying to use env variable to seperate out log file
this is how I understood from few post here that I read.
created /etc/metricbeat/env file and added
HOST=myelkhost1
then edited /lib/systemd/system/metricbeat.service file and added
EnvironmentFile=/etc/metricbeat/env
run systemctl daemon-reload
restarted metricbeat and I have logfile metricbeat\_myelkhost1
problem here is that everytime when I update metricbeat I will have to change /lib/systemd/system/metricbeat.service file in order to make this work.
is there any other option?
second problem is that in env file it works only if I hard code name.
I can't use any `hostname -s` or any linux command.
how do I manage this with 100s of system?
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### Author:  [@ChrsMark](https://discuss.elastic.co/u/ChrsMark)
#### Post date: [July 26, 2021, 11:08am UTC](https://discuss.elastic.co/t/env-variable-on-metricbeat-yml/279394/2 "2021-07-26T11:08:53Z")
Hi!
Please check [Use environment variables in the configuration | Metricbeat Reference [7.13] | Elastic](https://www.elastic.co/guide/en/beats/metricbeat/current/using-environ-vars.html) to find out more about how Metricbeat supports env vars natively. Maybe this is what you need.
C.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [August 23, 2021, 1:08pm UTC](https://discuss.elastic.co/t/env-variable-on-metricbeat-yml/279394/3 "2021-08-23T13:08:59Z")
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