当我学习教程并尝试运行docker logs rest时，它抛出了以下错误：我似乎不明白为什么
[2018-12-06 17:17:59] PM2 log: Launching in no daemon mode
[2018-12-06 17:17:59] PM2 log: Starting execution sequence in -fork mode- for app name:composer-rest-server id:0
[2018-12-06 17:17:59] PM2 log: App name:composer-rest-server id:0 online
WARNING: NODE_APP_INSTANCE value of '0' did not match any instance config file names.
WARNING: See https://github.com/lorenwest/node-config/wiki/Strict-Mode
Discovering types from business network definition ...
(node:19) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
预期输出：
docker logs rest
[2018-05-22 22:24:44] PM2 log: Launching in no daemon mode
[2018-05-22 22:24:44] PM2 log: Starting execution sequence in -fork mode- for app name:composer-rest-server id:0
[2018-05-22 22:24:44] PM2 log: App name:composer-rest-server id:0 online
WARNING: NODE_APP_INSTANCE value of '0' did not match any instance config file names.
WARNING: See https://github.com/lorenwest/node-config/wiki/Strict-Mode
Discovering types from business network definition ...
Discovered types from business network definition
Generating schemas for all types in business network definition ...
Generated schemas for all types in business network definition
Adding schemas for all types to Loopback ...
Added schemas for all types to Loopback
Web server listening at: http://localhost:3000
Browse your REST API at http://localhost:3000/explorer
[更新]：
[2018-12-08 04:01:58] PM2 log: Launching in no daemon mode
[2018-12-08 04:01:58] PM2 log: Starting execution sequence in -fork mode- for app name:composer-rest-server id:0
[2018-12-08 04:01:58] PM2 log: App name:composer-rest-server id:0 online
WARNING: NODE_APP_INSTANCE value of '0' did not match any instance config file names.
WARNING: See https://github.com/lorenwest/node-config/wiki/Strict-Mode
Discovering types from business network definition ...
要清除警告消息，需要将警告中指定的选项添加到COMPOSER_DATASOURCES环境变量中，例如
COMPOSER_DATASOURCES='{
"db": {
"name": "db",
"connector": "mongodb",
"host": "mongo",
"useNewUrlParser": "true"
}
}'