ubuntu - How to pass environment variables to a service started by systemd -


i have nodejs service built using nodejs. service requires environment variables passed it. moreover, created systemd unit file start systemctl. weird reasons, service, when started systemctl, not read environment variables. instance, 1 environment variable host, contains ip sails app binded. however, if start service sails lift or node app.js, read environment variables. here unit file:

[unit] description=project  [service] execstart=/usr/bin/node /mnt/project/app.js restart=always standardoutput=syslog  [install] wantedby=multi-user.target

i tried everything. added environment variables /etc/environment , pointed unit file it, added them unit file, nothing worked.

something 

[unit] description=project  [service] execstart=/usr/bin/node /mnt/project/app.js restart=always standardoutput=syslog environment=key=value  [install] wantedby=multi-user.target

https://coreos.com/os/docs/latest/using-environment-variables-in-systemd-units.html

or, alternative :

environmentfile=/path/to/env

with format : 

key=value

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