Am I trying to connect to a TLS-enabled daemon without TLS?

Question

I\'m trying to learn about Docker, but I keep getting cryptic (to me) error messages.

Possibly the simplest example of this is trying to print the version of Docker

Answer 1

TLDR: This got my Python meetup group past this problem when I was running a clinic on installing docker and most of the users were on OS X:

boot2docker init
boot2docker up

run the export commands the output gives you, then

docker info

should tell you it works.

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The Context (what brought us to the problem)

I led a clinic on installing docker and most attendees had OS X, and we ran into this problem and I overcame it on several machines. Here's the steps we followed:

First, we installed homebrew (yes, some attendees didn't have it):

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Then we got cask, which we used to install virtualbox, and then used brew to install docker and boot2docker (all required for OS X) Don't use sudo for brew.:

brew install caskroom/cask/brew-cask
brew cask install virtualbox
brew install docker
brew install boot2docker

The Solution

That was when we ran into the problem the asker here got. The following fixed it. I understand init was a one-time deal, but you'll probably have to run up every time you start docker:

boot2docker init
boot2docker up

Then when up has been run, it gives several export commands. Copy-paste and run those.

Finally docker info should tell you it's properly installed.

To Demo

The rest of the commands should demo it. (on Ubuntu linux I required sudo.)

docker run hello-world
docker run -it ubuntu bash

Then you should be on a root shell in the container:

apt-get install nano
exit

Back to your native user bash:

docker ps -l

Look for the about 12 digit hexadecimal (0-9 or a-f) identifier under "Container ID", e.g. 456789abcdef. You can then commit your change and name it some descriptive name, like descriptivename:

docker commit 456789abcdef descriptivename`