之前已配置好基础镜像，其他地方也需要用到这些镜像时怎么办呢？
答案：镜像的导入和导出功能。
- 镜像的保存
[root@wxtest1607 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat8 3.0 90457edaf6ff 6 hours ago 1.036 GB
[root@wxtest1607 lixr]# docker save 9045 > tomcat8-apr.tar
[root@wxtest1607 lixr]# ls -lh
总用量 1.2G
-rw-r--r-- 1 root root 1005M 8月 24 17:42 tomcat8-apr.tar
- 镜像的导入
当前缺一台CentOS7服务器，实践方式变成，先删除image，然后再导入，折腾呀！
[root@wxtest1607 lixr]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat8 3.0 90457edaf6ff 7 hours ago 1.036 GB
[root@wxtest1607 lixr]# docker rmi 9045
Untagged: tomcat8:3.0
Deleted: sha256:90457edaf6ff4ce328dd8a3131789c66e6bd89e1ce40096b89dd49d6e9d62bc8
Deleted: sha256:00df1d61992f2d87e7149dffa7afa5907df3296f5775c53e3ee731972e253600
[root@wxtest1607 lixr]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[root@wxtest1607 lixr]# docker load < tomcat8-apr.tar
60685807648a: Loading layer [==================================================>] 442.7 MB/442.7 MB
[root@wxtest1607 lixr]# yer [> ] 527.7 kB/442.7 MB
[root@wxtest1607 lixr]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> 90457edaf6ff 7 hours ago 1.036 GB
[root@wxtest1607 lixr]# docker tag 9045 tomcat8-apr:3.0
[root@wxtest1607 lixr]#
[root@wxtest1607 lixr]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat8-apr 3.0 90457edaf6ff 7 hours ago 1.036 GB
- 容器的导出
[root@wxtest1607 lixr]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b91d9ad83efa 9045 "/bin/bash" 18 seconds ago Up 15 seconds trusting_colden
f680b58163ab aa79 "/bin/bash" 8 hours ago Up 8 hours stupefied_mayer
4db6aa9b8278 4052 "mysqld_safe" 21 hours ago Up 21 hours 8080/tcp, 0.0.0.0:53307->3306/tcp nostalgic_leavitt
7bcfe52af7a0 599d "mysqld_safe" 21 hours ago Up 21 hours 8080/tcp, 0.0.0.0:53306->3306/tcp sleepy_hodgkin
[root@wxtest1607 lixr]#
[root@wxtest1607 lixr]#
[root@wxtest1607 lixr]# docker export b91d9ad83efa > tomcat80824.tar
[root@wxtest1607 lixr]# ls -lh
总用量 2.1G
-rw-r--r-- 1 root root 943M 8月 24 18:37 tomcat80824.tar
-rw-r--r-- 1 root root 1005M 8月 24 17:42 tomcat8-apr.tar
b91d9ad83efa 是 镜像90457edaf6ff 启动后的容器。
镜像导出的文件比容器导出文件大哦。
- 容器的导入
[root@wxtest1607 lixr]# docker import tomcat80824.tar
sha256:880fc96a6bb6abdfa949a56d40ef76f32f086fa11024ddcfb4e4e8b22041d5f2
[root@wxtest1607 lixr]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> 880fc96a6bb6 6 seconds ago 971.9 MB
[root@wxtest1607 lixr]# docker tag 880f tomcat80824:1.0
[root@wxtest1607 lixr]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat80824 1.0 880fc96a6bb6 About a minute ago 971.9 MB
tomcat8-apr 3.0 90457edaf6ff 8 hours ago 1.036 GB
- 镜像和容器 导出和导入的区别
镜像导入和容器导入的区别：
1）容器导入 是将当前容器 变成一个新的镜像
2）镜像导入 是复制的过程
save 和 export区别：
1）save 保存镜像所有的信息-包含历史
2）export 只导出当前的信息
[root@wxtest1607 lixr]# docker history 880fc96a6bb6
IMAGE CREATED CREATED BY SIZE COMMENT
880fc96a6bb6 12 minutes ago 971.9 MB Imported from -
[root@wxtest1607 lixr]# docker history 90457edaf6ff
IMAGE CREATED CREATED BY SIZE COMMENT
90457edaf6ff 8 hours ago /bin/bash 434.4 MB
<missing> 23 hours ago /bin/bash 406.5 MB
<missing> 7 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
<missing> 7 weeks ago /bin/sh -c #(nop) LABEL license=GPLv2 0 B
<missing> 7 weeks ago /bin/sh -c #(nop) LABEL vendor=CentOS 0 B
<missing> 7 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Imag 0 B
<missing> 7 weeks ago /bin/sh -c #(nop) ADD file:b3bdbca0669a03490e 194.6 MB
<missing> 7 weeks ago /bin/sh -c #(nop) MAINTAINER The CentOS Proje 0 B
