Ubuntu14 install docker-ce

Uninstall the old docker first

sudo apt-get remove docker docker-engine docker.io docker-ce

Using the repository over HTTPS

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

Add Docker official GPG key

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Set up stable repository

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

Update the apt package index

sudo apt-get update

Install the latest version of Docker CE

sudo apt-get install -y docker-ce

Or to list the version, select Install

apt-cache madison docker-ce

sudo apt-get install docker-ce=<VERSION>

example:

sudo apt-get install docker-ce=17.12.1~ce-0~ubuntu

View service status

jiqing@ThinkPad:~$ sudo /etc/init.d/docker start
start: Job is already running: docker
jiqing@ThinkPad:~$ sudo /etc/init.d/docker stop
docker stop/waiting
jiqing@ThinkPad:~$ sudo /etc/init.d/docker status
docker stop/waiting
jiqing@ThinkPad:~$ sudo /etc/init.d/docker restart
stop: Unknown instance: 
docker start/running, process 31877

Verify that it is normal, sudo docker run hello-world

jiqing@ThinkPad:~$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
9bb5a5d4561a: Pull complete 
Digest: sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77
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://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

Everything is ok.

ps: io and engine are both early versions of docker. ce is the community version, relatively new. ee is the enterprise version.