docker load -i myimage.tar[:gz]
cat myimage.tar[:gz] | docker load
gunzip -c myimage.tar.gz | docker load
docker save -o myimage.tar myimage:latest
docker save -o myimage.tar myimage:latest anotherimage:latest
docker save <镜像名:标签> | tar -czf myimage.tar.gz -
docker save <镜像名:标签> | gzip > myimage.tar.gz
docker images