Adrian Martin created NIFI-7060:
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Summary: Replace properties in nifi.properties by environment
variables
Key: NIFI-7060
URL: https://issues.apache.org/jira/browse/NIFI-7060
Project: Apache NiFi
Issue Type: Improvement
Components: Configuration, Docker
Reporter: Adrian Martin
{{start.sh}} replaces some properties defined in {{nifi.properties}} with a set
of environment variables.
This adds some flexibility as the users are able to modify properties without
touching the {{nifi.properties}} file but it can lead to some frustration when
users think they can replace any property by defining an environment variable
with the same name. Also, when users want to provide their own
{{nifi.properties}} file as some properties will be overwritten.
I believe we should only replace a property when there is an environment
variable defined with the same name (we should use the same names that appear
in the {{nifi.properties}} file in uppercase and replacing any {{.}} with
{{_}}). Defaults should be taken from the {{nifi.properties}} file.
This way users can replace the properties file with a custom one, choose to
define environment variables, or both.
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