docs/compose/envvars-precedence.md

title	description	keywords
Environment variables precedence	TODO	compose, environment, env file

• Command Line (docker compose run --env <KEY[=VAL]> https://docs.docker.com/engine/reference/commandline/compose_run/#options)
• Compose File (service::environment section: https://docs.docker.com/compose/compose-file/#environment)
• Compose File (service::env_file section file: https://docs.docker.com/compose/compose-file/#env_file)
• Container Image ENV directive (https://docs.docker.com/engine/reference/builder/#env)

When WHEREAMI is the variable in case:

Image (ENV directive in Dockerfile)	OS Environment	.env file on the project root (or overwrite through docker compose -–env-file <FILE>)	Compose file (service::env_file)	Compose file (service::environment)	Command line (docker compose run -e <KEY[=VAL]>)	RESULT
Dockerfile	OS_Env	WHEREAMI=DotEnv_File				Dockerfile
Dockerfile	OS_Env	WHEREAMI= DotEnv_File			WHEREAMI	DotEnv_File
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}			WHEREAMI	OS_Env
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}				Dockerfile
Dockerfile		WHEREAMI=${WHEREAMI:- DotEnv_File_DefaultValue }			WHEREAMI	DotEnv_File_DefaultValue
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}			WHEREAMI= Command_Line	Command_Line
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}		WHEREAMI		OS_Env
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}		WHEREAMI= Environment_Section		Environment_Section
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}		WHEREAMI=Environment_Section	WHEREAMI= Command_Line	Command_Line
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}		WHEREAMI=Environment_Section	WHEREAMI	OS_Env
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}		WHEREAMI	WHEREAMI= Command_Line	Command_Line
Dockerfile	OS_Env		WHEREAMI=Env_File		WHEREAMI= Command_Line	Command_Line
Dockerfile	OS_Env		WHEREAMI=Env_File	WHEREAMI= Environment_Section		Environment_Section
Dockerfile	OS_Env		WHEREAMI= Env_File			Env_File
Dockerfile	OS_Env			WHEREAMI=${WHEREAMI:-Environment_Section}		OS_Env
Dockerfile	OS_Env	WHEREAMI=${WHEREAMI:-DotEnv_File_DefaultValue}		WHEREAMI=${WHEREAMI:-Environment_Section}		OS_Env