Where is the Keystone configuration file located?

The Keystone file is located in /etc/keystone/

Normally Prabhin's comment will be correct.

And, to know for sure, probe your package manager.

For example, on Debian/Ubuntu derived systems, here's how to find the /etc setup for a given package.

net11 # dpkg -L logrotate | grep /etc
/etc
/etc/cron.daily
/etc/cron.daily/logrotate
/etc/logrotate.conf
/etc/logrotate.d

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So you can probe your package manager, to ensure you have the correct location

Additionally, sometimes there are overrides built into the system for users, so you camp on directories + start servers to see exactly what's occurring.

For example, this camp will tell you all config file accesses for keystone at the system level + some random user's level...

# Camp on various directories
inotifywait -mrq /etc/keystone /home/ubuntu /home/keystone

# Restart keystone + watch what files are accessed.

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