以我现在的7.2来说 docker 叫做 container-manager 群晖配置文件夹 /var/packages/ContainerManager/etc

vi dockerd.json

{"data-root":"/var/packages/ContainerManager/var/docker","log-driver":"db","registry-mirrors":["https://docker.m.daocloud.io","https://noohub.ru","https://huecker.io","

https://dockerhub.timeweb.cloud"],"storage-driver":"btrfs"}