Which value wins

Ferry merges the environment of a service in this order. This is the precedence:

1. the variables that Ferry injects (PORT, FERRY_*)
2. its env groups, in the order of the links
3. its own variables

See the resultCopy Anchor Link

$ ferry env ls echo --effectiveLOG_LEVEL=warnREGION=euDATABASE_URL=${{datastore.app-db.connectionString}}Merged from env group(s) shared, extra, then 'echo''s own variables (which win). ${{…}} references are resolved, and PORT/FERRY_* added, at start.

The command shows the merged environment.

• shared sets LOG_LEVEL=info.
• extra sets LOG_LEVEL=debug. You linked it later.
• The own LOG_LEVEL=warn of the service wins.

Without the own value, the service gets debug.