MacでDockerを入れて自分で作ったイメージを保存するまで ref: http://qiita.com/mapyo/items/f90f9a6fac5a600ea21e

file0.sh

$ brew install docker boot2docker
$ docker -v
Docker version 1.3.1, build 4e9bbfa
$ boot2docker -v
Boot2Docker-cli version: v1.3.1

file1.sh

$ brew update
$ brew upgrade docker
$ brew upgrade boot2docker

file2.sh

$ boot2docker init
$ boot2docker up
Waiting for VM and Docker daemon to start...
.......................ooo
Started.
Writing /Users/mapyo/.boot2docker/certs/boot2docker-vm/ca.pem
Writing /Users/mapyo/.boot2docker/certs/boot2docker-vm/cert.pem
Writing /Users/mapyo/.boot2docker/certs/boot2docker-vm/key.pem

To connect the Docker client to the Docker daemon, please set:
    export DOCKER_HOST=tcp://192.168.59.104:2376
    export DOCKER_CERT_PATH=/Users/mapyo/.boot2docker/certs/boot2docker-vm
    export DOCKER_TLS_VERIFY=1

file3.sh

docker pull centos:centos6

file4.sh

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos              centos6             70441cac1ed5        3 weeks ago         215.8 MB

file5.sh

$ docker run -t -i --name hoge centos:centos6 /bin/bash
[root@612cf98173a6 /]#

file6.sh

[root@612cf98173a6 /]# yum install vim
# いろいろ
[root@612cf98173a6 /]# exit

file7.sh

$ docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
612cf98173a6        centos:centos6      "/bin/bash"         15 minutes ago      Exited (0) 9 minutes ago                       hoge

file8.sh

$ docker commit hoge mapyo/hoge-image:0.0.1

file9.sh

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
mapyo/hoge-image    0.0.1               a68a12549598        12 minutes ago      306.3 MB
centos              centos6             70441cac1ed5        3 weeks ago         215.8 MB