CODEWITHSUNDEEP
dockerdocker-machine
aeas44
aeas44

Reputation: 27

How can I save my RSA KEY in my Docker Machine?

~/.ssh/my_id_rsa in a VM created by docker-machine create gets disappeared whenever I restart it. I've read documents on docs.docker.com, but I couldn't find information about this issue.

My host machine is Mac (El Capitan), and the version of docker-machine is as follows:

$ docker-machine version
docker-machine version 0.6.0, build e27fb87

I've created my VM with following options:

$ docker-machine create --driver virtualbox dev

Is there any advice on how to fix this issue? Where should I look into?

More concretely, I want to know how to avoid this issue:

(host) $ docker-machine create --driver virtualbox dev
(host) $ docker-machine ssh dev
(dev) $ ssh-keygen
...
(dev) $ ls ~/.ssh
authorized_keys   authorized_keys2  id_rsa            id_rsa.pub
(dev) $ logout
(host) $ docker-machine restart dev
(host) $ docker-machine ssh dev
(dev) $ ls ~/.ssh
authorized_keys   authorized_keys2

Where's "id_rsa" and "id_rsa.pub"?

Upvotes: 1

Views: 1384

Answers (1)

VonC
VonC

Reputation: 1326716

Usually, I don't specify anything regarding ssh keys: docker-machine creates a passphrase-less ssh key in ~/.docker/machine/machines/<amachine>/

If you want to specify your own, see this example from the docker-machine documentation:

$ docker-machine create \
  --driver generic \
  --generic-ip-address=203.0.113.81 \
  --generic-ssh-key=~/.ssh/id_rsa \
  vm

The OP adds:

(dev) $ logout
(host) $ docker-machine restart dev
(host) $ docker-machine ssh dev

That is creating ssh key within the virtual machine itself: the TinyCore-based boot2docker only persists what is in /var/lib/boot2docker, nothing else.
It does mount /Users, but other than that, anything else (including /home/docker, the ~ in ~/.ssh)is reset to the boot2docker.iso original content at the next restart.
See "boot2docker: Persist data"

For those ssh keys to persists across session, you would need to either:

  • generate them in /Users/any/path/you/want (as they would actually be stored on the host)
  • or generate them in /var/lib/boot2docker

Upvotes: 2

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