简单版：
1.执行命令curl -sSL https://get.daocloud.io/docker | sh
前提：
a.虚拟机可以上网
b.Centos为64位
c.要用root用户
2.看docker版本 docker -v
3.从HelloWorld开始
a.service docker start
b.docker run hello-world
出现HelloWorld就说明成功啦~
带具体结果的版本：
1.执行命令DaoCloud的安装本(是好的，哈哈)：
curl -sSL https://get.daocloud.io/docker | sh
执行命令前，要记得切换到root用户下，避免因为权限引起一系列的问题
[root@192 ~]# curl -sSL https://get.daocloud.io/docker | sh
# Executing docker install script, commit: 1d31602
+ sh -c 'yum install -y -q yum-utils'
软件包 yum-utils-1.1.31-42.el7.noarch 已安装并且是最新版本
+ sh -c 'yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo'
已加载插件：fastestmirror, langpacks
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo
+ '[' edge '!=' stable ']'
+ sh -c 'yum-config-manager --enable docker-ce-edge'
已加载插件：fastestmirror, langpacks
============================= repo: docker-ce-edge =============================
[docker-ce-edge]
async = True
bandwidth = 0
base_persistdir = /var/lib/yum/repos/x86_64/7
baseurl = https://download.docker.com/linux/centos/7/x86_64/edge
cache = 0
cachedir = /var/cache/yum/x86_64/7/docker-ce-edge
check_config_file_age = True
compare_providers_priority = 80
cost = 1000
deltarpm_metadata_percentage = 100
deltarpm_percentage =
enabled = 1
enablegroups = True
exclude =
failovermethod = priority
ftp_disable_epsv = False
gpgcadir = /var/lib/yum/repos/x86_64/7/docker-ce-edge/gpgcadir
gpgcakey =
gpgcheck = True
gpgdir = /var/lib/yum/repos/x86_64/7/docker-ce-edge/gpgdir
gpgkey = https://download.docker.com/linux/centos/gpg
hdrdir = /var/cache/yum/x86_64/7/docker-ce-edge/headers
http_caching = all
includepkgs =
ip_resolve =
keepalive = True
keepcache = False
mddownloadpolicy = sqlite
mdpolicy = group:small
mediaid =
metadata_expire = 21600
metadata_expire_filter = read-only:present
metalink =
minrate = 0
mirrorlist =
mirrorlist_expire = 86400
name = Docker CE Edge - x86_64
old_base_cache_dir =
password =
persistdir = /var/lib/yum/repos/x86_64/7/docker-ce-edge
pkgdir = /var/cache/yum/x86_64/7/docker-ce-edge/packages
proxy = False
proxy_dict =
proxy_password =
proxy_username =
repo_gpgcheck = False
retries = 10
skip_if_unavailable = False
ssl_check_cert_permissions = True
sslcacert =
sslclientcert =
sslclientkey =
sslverify = True
throttle = 0
timeout = 30.0
ui_id = docker-ce-edge/x86_64
ui_repoid_vars = releasever,
basearch
username =
+ sh -c 'yum makecache'
已加载插件：fastestmirror, langpacks
base | 3.6 kB 00:00
docker-ce-edge | 2.9 kB 00:00
docker-ce-stable | 2.9 kB 00:00
docker-main-repo | 2.9 kB 00:00
extras | 3.4 kB 00:00
updates | 3.4 kB 00:00
(1/15): docker-ce-edge/x86_64/filelists_db | 7.1 kB 00:02
(2/15): docker-ce-edge/x86_64/primary_db | 12 kB 00:03
(3/15): docker-ce-stable/x86_64/primary_db | 11 kB 00:01
(4/15): docker-ce-edge/x86_64/other_db | 61 kB 00:02
(5/15): docker-ce-stable/x86_64/other_db | 65 kB 00:02
(6/15): docker-ce-stable/x86_64/filelists_db | 6.5 kB 00:05
(7/15): docker-main-repo/filelists_db | 40 kB 00:04
(8/15): extras/7/x86_64/prestodelta | 71 kB 00:08
(9/15): extras/7/x86_64/other_db | 96 kB 00:05
(10/15): docker-main-repo/other_db | 652 kB 00:20
(11/15): extras/7/x86_64/filelists_db | 528 kB 00:32
(12/15): updates/7/x86_64/other_db | 492 kB 00:27
(13/15): base/7/x86_64/other_db | 2.5 MB 01:13
(14/15): updates/7/x86_64/filelists_db | 2.8 MB 01:06
(15/15): base/7/x86_64/filelists_db | 6.7 MB 01:56
Loading mirror speeds from cached hostfile
* base: mirror.bit.edu.cn
* extras: centos.ustc.edu.cn
* updates: centos.ustc.edu.cn
元数据缓存已建立
+ sh -c 'yum install -y -q docker-ce'
警告：/var/cache/yum/x86_64/7/extras/packages/container-selinux-2.33-1.git86f33cd.el7.noarch.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID f4a80eb5: NOKEY
container-selinux-2.33-1.git86f33cd.el7.noarch.rpm 的公钥尚未安装
警告：/var/cache/yum/x86_64/7/docker-ce-edge/packages/docker-ce-17.12.0.ce-1.el7.centos.x86_64.rpm: 头V4 RSA/SHA512 Signature, 密钥 ID 621e9f35: NOKEY
docker-ce-17.12.0.ce-1.el7.centos.x86_64.rpm 的公钥尚未安装
导入 GPG key 0xF4A80EB5:
用户ID : "CentOS-7 Key (CentOS 7 Official Signing Key) "
指纹 : 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
软件包 : centos-release-7-4.1708.el7.centos.x86_64 (@anaconda)
来自 : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
导入 GPG key 0x621E9F35:
用户ID : "Docker Release (CE rpm) "
指纹 : 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35
来自 : https://download.docker.com/linux/centos/gpg
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 your-user
Remember that you will have to log out and back in for this to take effect!
WARNING: Adding a user to the "docker" group will grant the ability to run
containers which can be used to obtain root privileges on the
docker host.
Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
for more information.
2.查看docker的版本
[root@192 ~]# docker -v
Docker version 17.12.0-ce, build c97c6d6
3.从第一个helloworld开始，证明docker安装成功啦~~~
[root@192 ~]# docker run hello-world
docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.
[root@192 ~]# service docker start
Redirecting to /bin/systemctl start docker.service
[root@192 ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
ca4f61b1923c: Pull complete
Digest: sha256:445b2fe9afea8b4aa0b2f27fe49dd6ad130dfe7a8fd0832be5de99625dad47cd
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
[root@192 ~]#