[CentOS] C7 and docker storage

[Andrew Holway]

I believe use of any kind of storage in conjunction with docker is
generally discouraged. Docker is a quite neat way of packaging up apps and
deploying them but if you care about your data I would store it somewhere
independent of docker.

Ta,

Andrew

On 29 November 2017 at 22:23, <m.roth at 5-cent.us> wrote:

> Was working on docker on a server, and on startup, I see
> Nov 29 10:58:27 <servername> dockerd-current:
> time="2017-11-29T10:58:27.612849959-05:00" level=warning msg="devmapper:
> Usage of loopback devices is strongly discouraged for production use.
> Please use `--storage-opt dm.thinpooldev` or use `man docker` to refer to
> dm.thinpooldev section."
> Nov 29 10:58:27 <servername> dockerd-current:
> time="2017-11-29T10:58:27.655600686-05:00" level=warning msg="devmapper:
> Base device already exists and has filesystem xfs on it. User specified
> filesystem  will be ignored."
>
> The latter would explain the message my user's job gave him when it tried
> to umount /
>
> A bit of googling, and I see something called overlayFS can be used... but
> I know nothing about that, or how dangerous it is.  Anyone got a pointed
> to something more than the minimal how to configure docker to use it?
>
>         mark
>
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