docker镜像文件的导入与导出（docker镜像迁移）

1、查看镜像ID

# docker images

[root@localhost ~]# docker images
REPOSITORY                                             TAG                 IMAGE ID            CREATED             SIZE
mytomcat                                               1.0                 f8ec6dad9608        22 minutes ago      612MB
centos                                                 latest              1e1148e4cc2c        7 weeks ago         202MB

 2、选择要打包的镜像，执行打包命令

docker save : 将指定镜像保存成 tar 归档文件

语法：

docker save [options] image [image……]

options

-o :输出到的文件。

# docker save -o mytomcat.tar mytomcat:1.0

[root@localhost ~]# docker save -o mytomcat.tar mytomcat:1.0
[root@localhost ~]# 
[root@localhost ~]# ls
anaconda-ks.cfg                  mytomcat.tar  

 3、scp远程复制到迁移的另一台服务器上

# scp -r mytomcat.tar root@192.168.2.207:/root/

[root@localhost ~]# scp -r mytomcat.tar root@192.168.2.207:/root/
The authenticity of host '192.168.2.207 (192.168.2.207)' can't be established.
ECDSA key fingerprint is fa:8c:a3:e2:79:7e:cc:be:1e:14:35:6a:e7:45:de:95.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.2.207' (ECDSA) to the list of known hosts.
root@192.168.2.207's password: 
mytomcat.tar                                                                                                                             100%  594MB   5.6MB/s   01:46    
[root@localhost ~]# 

4、到另一台服务器上导入

查看已有的镜像

# docker images

[root@localhost ~]# docker images
REPOSITORY                                             TAG                 IMAGE ID            CREATED             SIZE
mysql                                                  latest              102816b1ee7d        4 weeks ago         486MB

导入镜像

# docker load -i mytomcat.tar

[root@localhost ~]# ls
mytomcat.tar    software
[root@localhost ~]# 
[root@localhost ~]# docker load -i mytomcat.tar
071d8bd76517: Loading layer [==================================================>]  210.2MB/210.2MB
cc30c42de5c4: Loading layer [==================================================>]  412.5MB/412.5MB
Loaded image: mytomcat:1.0
[root@localhost ~]# 

查看是否成功导入

[root@localhost ~]# docker images
REPOSITORY                                             TAG                 IMAGE ID            CREATED                  SIZE
mytomcat                                               1.0                 f8ec6dad9608        Less than a second ago   612MB
mysql                                                  latest              102816b1ee7d        4 weeks ago              486MB

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