Docker image migration

Experimental environment

Operating system: CentOS Linux release 7.3.1611 (Core)

docker version: 17.11.0-ce

image copies

To view an existing docker image:

[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

Save the image Hello world as an archive file and compress to generate the compression package 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

Load image

I use a machine here, so delete the Hello world image first, and then use the load command to restore:

To delete a mirror:

[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

Load the mirrored archive package:

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

Check the image in the machine:

[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

Found that the Hello world image has been successfully recovered