一 保存镜像

[root@localhost mydocker]# docker save --help

Usage:  docker save [OPTIONS] IMAGE [IMAGE...]

Save one or more images to a tar archive (streamed to STDOUT by default)

Options:
  -o, --output string   Write to a file, instead of STDOUT

-o 指定保存镜像的位置

保存镜像时候要用镜像名称：标签，不要用镜像ID，否则导入默认镜像名称和版本为null。

保存镜像redis到 /mydocker/images/redis.tar

[root@localhost mydocker]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED      SIZE
redis        latest    ccee4cdf984f   8 days ago   105MB
[root@localhost mydocker]# ls
jdk.tar.gz  tomcat9  tomcat.tar.gz
[root@localhost mydocker]# mkdir images
[root@localhost mydocker]# cd images/
[root@localhost images]# ls
[root@localhost images]# docker save -o /mydocker/images/redis.tar redis
[root@localhost images]# ls
redis.tar

二 加载镜像

[root@localhost mydocker]# docker load --help

Usage:  docker load [OPTIONS]

Load an image from a tar archive or STDIN

Options:
  -i, --input string   Read from tar archive file, instead of STDIN
  -q, --quiet          Suppress the load output

-i 指定加载的镜像

[root@localhost images]# docker rmi redis
Untagged: redis:latest
Untagged: redis@sha256:6cddb3822e19f09a6a369c35680562ddd2e44bd3bfd6fe25ec6456c42f45728b
Deleted: sha256:ccee4cdf984f11952441cbab30146dae792c8d9fb668e762c78a49e7db858082
Deleted: sha256:a4f3d68d06ee9aec1862695818528930f0e889f5c892da8be4c06759dc2e8f86
Deleted: sha256:02c22c39334cefb22054330d3be804a3046286d7f0a47d83f5f25be13f4e635e
Deleted: sha256:2d01997f1c500789fc369f5440ea810257641af6fbb1d4eaeb9558d94ea8879d
Deleted: sha256:f448a5cc1367794bb2f15d887438c8b43f2324ee3523f5d95c15997685cc816d
Deleted: sha256:e481db33c0c73ee7de5ecda57c21fcfb7eeeff7d22fcc4ad0166b0bf64a63a32
[root@localhost images]# docker images
REPOSITORY   TAG       IMAGE ID   CREATED   SIZE
[root@localhost images]# docker load -i /mydocker/images/redis.tar
89ce1a07a7e4: Loading layer [==================================================>]  338.4kB/338.4kB
9eef6e3cc293: Loading layer [==================================================>]  4.194MB/4.194MB
ee748697d275: Loading layer [==================================================>]   31.7MB/31.7MB
f1f7964d40af: Loading layer [==================================================>]  2.048kB/2.048kB
3d9fda8ff875: Loading layer [==================================================>]  3.584kB/3.584kB
Loaded image: redis:latest
[root@localhost images]# docker image

Usage:  docker image COMMAND

Manage images

Commands:
  build       Build an image from a Dockerfile
  history     Show the history of an image
  import      Import the contents from a tarball to create a filesystem image
  inspect     Display detailed information on one or more images
  load        Load an image from a tar archive or STDIN
  ls          List images
  prune       Remove unused images
  pull        Pull an image or a repository from a registry
  push        Push an image or a repository to a registry
  rm          Remove one or more images
  save        Save one or more images to a tar archive (streamed to STDOUT by default)
  tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

Run 'docker image COMMAND --help' for more information on a command.
[root@localhost images]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED      SIZE
redis        latest    ccee4cdf984f   8 days ago   105MB