docker：

轻量级的虚拟机，隔离应用的运行环境，依托web仓库里众多的镜像，可快速搭建各种服务和运行环境，优势明显，不做过多介绍，这里介绍安装方法：

ubuntu16.04 上安装方法：

root@ubuntu:~# sudo apt install docker.io -y

Reading package lists... Done

Building dependency tree     

Reading state information... Done

The following additional packages will be installed:

  bridge-utils cgroupfs-mount ubuntu-fan

Suggested packages:

  mountall aufs-tools debootstrap docker-doc rinse zfs-fuse | zfsutils

The following NEW packages will be installed:

  bridge-utils cgroupfs-mount docker.io ubuntu-fan

0 upgraded, 4 newly installed, 0 to remove and 234 not upgraded.

Need to get 17.1 MB of archives.

After this operation, 90.5 MB of additional disk space will be used.

Get:1 http://mirrors.aliyun.com/ubuntu xenial/main amd64 bridge-utils amd64 1.5-9ubuntu1 [28.6 kB]

Get:2 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 cgroupfs-mount all 1.2 [4970 B]

Get:3 http://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 docker.io amd64 17.03.2-0ubuntu2~16.04.1 [17.1 MB]

Get:4 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 ubuntu-fan all 0.12.8~16.04.2 [35.6 kB]

Fetched 17.1 MB in 2s (5986 kB/s)

perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

LANGUAGE = (unset),

LC_ALL = (unset),

LC_TIME = "zh_CN.UTF-8",

LC_MONETARY = "zh_CN.UTF-8",

LC_ADDRESS = "zh_CN.UTF-8",

LC_TELEPHONE = "zh_CN.UTF-8",

LC_NAME = "zh_CN.UTF-8",

LC_MEASUREMENT = "zh_CN.UTF-8",

LC_IDENTIFICATION = "zh_CN.UTF-8",

LC_NUMERIC = "zh_CN.UTF-8",

LC_PAPER = "zh_CN.UTF-8",

LANG = "en_US.UTF-8"

    are supported and installed on your system.

perl: warning: Falling back to a fallback locale ("en_US.UTF-8").

locale: Cannot set LC_ALL to default locale: No such file or directory

Preconfiguring packages ...

Selecting previously unselected package bridge-utils.

(Reading database ... 61738 files and directories currently installed.)

Preparing to unpack .../bridge-utils_1.5-9ubuntu1_amd64.deb ...

Unpacking bridge-utils (1.5-9ubuntu1) ...

Selecting previously unselected package cgroupfs-mount.

Preparing to unpack .../cgroupfs-mount_1.2_all.deb ...

Unpacking cgroupfs-mount (1.2) ...

Selecting previously unselected package docker.io.

Preparing to unpack .../docker.io_17.03.2-0ubuntu2~16.04.1_amd64.deb ...

Unpacking docker.io (17.03.2-0ubuntu2~16.04.1) ...

Selecting previously unselected package ubuntu-fan.

Preparing to unpack .../ubuntu-fan_0.12.8~16.04.2_all.deb ...

Unpacking ubuntu-fan (0.12.8~16.04.2) ...

Processing triggers for man-db (2.7.5-1) ...

Processing triggers for ureadahead (0.100.0-19) ...

Processing triggers for systemd (229-4ubuntu16) ...

Setting up bridge-utils (1.5-9ubuntu1) ...

locale: Cannot set LC_ALL to default locale: No such file or directory

Setting up cgroupfs-mount (1.2) ...

Setting up docker.io (17.03.2-0ubuntu2~16.04.1) ...

locale: Cannot set LC_ALL to default locale: No such file or directory

Adding group `docker' (GID 118) ...

Done.

Setting up ubuntu-fan (0.12.8~16.04.2) ...

Processing triggers for systemd (229-4ubuntu16) ...

Processing triggers for ureadahead (0.100.0-19) ...

root@ubuntu:~# docker version

Client:

Version:      17.03.2-ce

API version:  1.27

Go version:  go1.6.2

Git commit:  f5ec1e2

Built:        Thu Jul  5 23:07:48 2018

OS/Arch:      linux/amd64

Server:

Version:      17.03.2-ce

API version:  1.27 (minimum version 1.12)

Go version:  go1.6.2

Git commit:  f5ec1e2

Built:        Thu Jul  5 23:07:48 2018

OS/Arch:      linux/amd64

Experimental: false

如果说找不到该软件，则可能是跟apt软件源有关，我本地的apt源是这样的：

需要注意的是，如果更新了软件源，需要执行 :

apt update 

apt  install docker.io

root@ubuntu:~# cat /etc/apt/sources.list

# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted

deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties

deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted

deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted

deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties

deb http://mirrors.aliyun.com/ubuntu/ xenial universe

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe

deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse

deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties

deb http://archive.canonical.com/ubuntu xenial partner

deb-src http://archive.canonical.com/ubuntu xenial partner

deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted

deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties

deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe

deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse