chore(config): Change default log_to config

By default log to file.
When start from console or forgreground, only log to console.
Only log to file for package builds.

bin/emqx

@@ -518,6 +518,9 @@ case "$1" in
                 ;;
         esac
 
+        # set before generate_config
+        export EMQX_LOG__TO='console'
+
         #generate app.config and vm.args
         generate_config
 
@@ -534,7 +537,8 @@ case "$1" in
         # shellcheck disable=SC2086 # $RELX_CONFIG_PATH $CONFIG_ARGS $EPMD_ARG are supposed to be split by whitespace
         # Build an array of arguments to pass to exec later on
         # Build it here because this command will be used for logging.
-        set -- "$BINDIR/erlexec" -boot "$BOOTFILE" -mode "$CODE_LOADING_MODE" \
+        set -- "$BINDIR/erlexec" \
+            -boot "$BOOTFILE" -mode "$CODE_LOADING_MODE" \
             -boot_var ERTS_LIB_DIR "$ERTS_LIB_DIR" \
             -mnesia dir "\"${MNESIA_DATA_DIR}\"" \
             $RELX_CONFIG_PATH $CONFIG_ARGS $EPMD_ARG
@@ -557,6 +561,9 @@ case "$1" in
         # start up the release in the foreground for use by runit
         # or other supervision services
 
+        # set before generate_config
+        export EMQX_LOG__TO='console'
+
         #generate app.config and vm.args
         generate_config
 

etc/emqx.conf

@@ -412,7 +412,7 @@ rpc.socket_buffer = 1MB
 ## - file: write logs only to file
 ## - console: write logs only to standard I/O
 ## - both: write logs both to file and standard I/O
-log.to = both
+log.to = file
 
 ## The log severity level.
 ##

priv/emqx.schema

@@ -449,7 +449,7 @@ end}.
 %%--------------------------------------------------------------------
 
 {mapping, "log.to", "kernel.logger", [
-  {default, console},
+  {default, file},
   {datatype, {enum, [off, file, console, both]}}
 ]}.