Docker容器的导入和导出&存储和加载
保存镜像文件或容器作为一个压缩的文件，和别人进行共享。导出一个容器作为一个tar文件。
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8c892f17fc59 ubuntu:14.04 "/bin/bash" 6 minutes ago Exited (0) 5 minutes ago adoring_ardinghelli
90d654f31d93 ubuntu:14.04 "sleep 360" 4 hours ago Exited (0) 4 hours ago testcopy
5a5d99af6149 ubuntu:14.04 "/bin/bash" 5 hours ago Exited (0) 5 hours ago heuristic_torvalds
feff1c794224 ubuntu:14.04 "/bin/bash" 5 hours ago Exited (0) 5 hours ago data
b2913d513319 mysql "docker-entrypoint.s…" 5 hours ago Up 5 hours 3306/tcp mysqlwp
# docker export 8c8 > update.tar
# ll
total 190652
-rw-r--r-- 1 root root 195227136 May 27 15:13 update.tar
我们把导出的容器复制到192.168.20.121这个主机上去，然后进行导入。
# scp update.tar root@192.168.20.121:/root
update.tar
# docker import - update < update.tar
sha256:ba68497253af98610ccba424463f0b867a21af69589cc7e0618b5b1db8771639
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
update latest ba68497253af 7 seconds ago 186MB
以上步骤也可以使用save和Load选项，可以达到同样的效果。
# docker save -o update1.tar update
# docker rmi update
Untagged: update:latest
Deleted: sha256:ba68497253af98610ccba424463f0b867a21af69589cc7e0618b5b1db8771639
Deleted: sha256:162b149483cd0d3786732c9012a24d21b2b81c404d45b6e1a99dc5ccf17f08c9
# docker load < update1.tar
162b149483cd: Loading layer [==================================================>]195.2MB/195.2MB
Loaded image: update:latest
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
update latest ba68497253af 4 minutes ago 186MB
save& load 和export & improt两个方法结果都是一样的。
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