CentOS 7 に docker をインストールして hello world するまで ref: http://qiita.com/satoshi_iwashita/items/4f77e8c85c2dd094f79f

file0.txt

$ curl -fsSL https://get.docker.com/ | sh
$ systemctl start docker.service

file1.txt

[vagrant@localhost ~]$ curl -fsSL https://get.docker.com/ | sh
+ sudo -E sh -c 'sleep 3; yum -y -q install docker-engine'
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
warning: /var/cache/yum/x86_64/7/docker-main-repo/packages/docker-engine-selinux-1.10.0-1.el7.centos.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 2c52609d: NOKEY
docker-engine-selinux-1.10.0-1.el7.centos.noarch.rpm の公開鍵がインストールされていません
Importing GPG key 0x2C52609D:
 Userid     : "Docker Release Tool (releasedocker) <docker@docker.com>"
 Fingerprint: 5811 8e89 f3a9 1289 7c07 0adb f762 2157 2c52 609d
 From       : https://yum.dockerproject.org/gpg
Created symlink from /etc/systemd/system/sysinit.target.wants/lvm2-lvmpolld.socket to /usr/lib/systemd/system/lvm2-lvmpolld.socket.

If you would like to use Docker as a non-root user, you should now consider
adding your user to the "docker" group with something like:

  sudo usermod -aG docker vagrant

Remember that you will have to log out and back in for this to take effect!

file10.txt

$ sudo docker run -it --entrypoint "/bin/bash" centos/nginx:1.2
[root@920ea5c72a47 /]# 

file11.txt

$ curl -s localhost
hello world

file12.txt

$ sudo docker stop *コンテナID*

file13.txt

$ sudo docker rm *コンテナID*

file14.txt

$ for p in $(sudo docker ps -a -q); do sudo docker rm -f ${p}; done

file15.txt

$ sudo docker rmi *イメージID*

file2.txt

$ sudo usermod -aG docker vagrant

file3.txt

[vagrant@localhost docker]$ docker version
Client:
 Version:      1.10.0
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   590d5108
 Built:        Thu Feb  4 18:34:50 2016
 OS/Arch:      linux/amd64
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

file4.txt

[vagrant@localhost docker]$ tree
.
├── Dockerfile
└── index.html

0 directories, 2 files

file5.txt

FROM centos
MAINTAINER rriifftt rriifftt@gmail.com
RUN yum install -q -y epel-release
RUN yum install -q -y nginx
ADD index.html /usr/share/nginx/html/

EXPOSE 80
ENTRYPOINT ["/usr/sbin/nginx", "-g", "daemon off;", "-c", "/etc/nginx/nginx.conf"]

file6.txt

$ sudo docker -t centos/nginx:1.0 .

file7.txt

[vagrant@localhost docker]$ sudo docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos/nginx        1.1                 80d766bb9338        About an hour ago   356 MB
centos/nginx        1.0                 d1345ae2d9a6        9 hours ago         356 MB
centos              latest              61b442687d68        6 weeks ago         196.6 MB
hello-world         latest              690ed74de00f        3 months ago        960 B

file8.txt

$ sudo docker run -d -p 80:80 centos/nginx:1.1
753d92d2bf360a529e881efaee564f86840e8d2d649f20825a7132093b45683e

file9.txt

 sudo docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
753d92d2bf36        centos/nginx:1.1    "/usr/sbin/nginx -g '"   3 minutes ago       Up 3 minutes        0.0.0.0:80->80/tcp   determined_tesla