set up the repository for docker

公式を参考にします。
https://docs.docker.com/install/linux/docker-ce/ubuntu/#install-from-a-package

$ sudo apt-get update

$ sudo apt-get install \
apt-transport-https \
ca-certificates \
curl \
software-properties-common

vagrant@vagrant-ubuntu-trusty-64:~$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add –
OK

vagrant@vagrant-ubuntu-trusty-64:~$ sudo apt-key fingerprint 0EBFCD88
/etc/apt/trusted.gpg
——————–
pub 1024D/437D05B5 2004-09-12
Key fingerprint = 6302 39CC 130E 1A7F D81A 27B1 4097 6EAF 437D 05B5
uid Ubuntu Archive Automatic Signing Key
sub 2048g/79164387 2004-09-12

pub 1024D/FBB75451 2004-12-30
Key fingerprint = C598 6B4F 1257 FFA8 6632 CBA7 4618 1433 FBB7 5451
uid Ubuntu CD Image Automatic Signing Key

pub 4096R/C0B21F32 2012-05-11
Key fingerprint = 790B C727 7767 219C 42C8 6F93 3B4F E6AC C0B2 1F32
uid Ubuntu Archive Automatic Signing Key (2012)

pub 4096R/EFE21092 2012-05-11
Key fingerprint = 8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
uid Ubuntu CD Image Automatic Signing Key (2012)

pub 4096R/0EBFCD88 2017-02-22
Key fingerprint = 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88
uid Docker Release (CE deb)
sub 4096R/F273FCD8 2017-02-22

sudo add-apt-repository \
“deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable”

さあ、遂にdockerを入れていきます。
$ sudo apt-get install docker-ce

vagrant@vagrant-ubuntu-trusty-64:~$ sudo docker run hello-world

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://hub.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/get-started/

vagrant@vagrant-ubuntu-trusty-64:~$ docker –version
Docker version 18.06.1-ce, build e68fc7a

OKKKKKKKKKKKKKKKKKKKKKKKKKKKK!