Docker镜像迁移

Docker镜像迁移

实验环境

操作系统：CentOS Linux release 7.3.1611 (Core)

docker版本： 17.11.0-ce

镜像备份

查看现有docker镜像：

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
eg_postgresql       latest              431a93e7033e        2 weeks ago         318MB
centos              latest              3fa822599e10        4 weeks ago         204MB
hello-world         latest              f2a91732366c        5 weeks ago         1.85kB

将镜像hello-world保存为归档文件并压缩生成压缩包hello-world-lastest.tar.gz

[root@localhost ~]# docker save hello-world |gzip >hello-world-lastest.tar.gz
[root@localhost ~]# ls
anaconda-ks.cfg  Documents  hello-world-lastest.tar.gz  Music            Pictures  Templates
Desktop          Downloads  initial-setup-ks.cfg        original-ks.cfg  Public    Videos

加载镜像

这里我使用的是一台机器，所以先删除hello-world镜像，再使用加载命令恢复：

删除镜像：

[root@localhost ~]# docker rmi f2a91732366c --force
Untagged: hello-world:latest
Untagged: hello-world@sha256:be0cd392e45be79ffeffa6b05338b98ebb16c87b255f48e297ec7f98e123905c
Deleted: sha256:f2a91732366c0332ccd7afd2a5c4ff2b9af81f549370f7a19acd460f87686bc7
[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
eg_postgresql       latest              431a93e7033e        2 weeks ago         318MB
centos              latest              3fa822599e10        4 weeks ago         204MB

加载镜像的归档文件包：

[root@localhost ~]# docker load -i hello-world-lastest.tar.gz
Loaded image: hello-world:latest

检查机器中的镜像：

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
eg_postgresql       latest              431a93e7033e        2 weeks ago         318MB
centos              latest              3fa822599e10        4 weeks ago         204MB
hello-world         latest              f2a91732366c        5 weeks ago         1.85kB

发现hello-world镜像已经成功恢复