Usage:  docker start [OPTIONS] CONTAINER [CONTAINER...]
 
 Start one or more stopped containers
 
 Options:
 -a, --attach               Attach STDOUT/STDERR and forward signals
 --detach-keys string   Override the key sequence for detaching a container
 --help                 Print usage
 -i, --interactive          Attach container's STDIN

-aJust open the output stream, you can continue to get the output of the container, and add-iOnly then can the input stream be opened so that your operation can be reflected in the container. If you don’t add it, you will appear.suspended animationThe situation.