persistent store is not declared in Dockerfile about docker HOT 4 CLOSED

+1 - Cannot manage to make this work. Show stopper.

from docker.

This is by design - docker official image repos suggest NOT placing volume in the Dockerfile - as it can't be removed by dependent dockerfiles. You can have a Dockerfile with FROM jenkins at the top - and then VOLUME as needed.

However - using -v /local/path:/internal/path is a different issue (the PR) - I get the feeling there is general confusion with how docker works. Putting -v /volume/here is the same as VOLUME in dockerfile (wthout the limitations) - which is different again to -v /host/path:/volume/here.

from docker.

Hi,

can you put a reference to the suggestion of not placing volumes in the Dockerfiles?

It's true, volumes can't be removed by dependent Dockerfiles, but that's by design. I can't think of a use case that it is necessary to keep the data inside a living jenkins container, that would break any possible upgrading patterns.

In general, most official repos do have a volume defined, so that the data are stored separately from the container. I put some examples below:

• Redis Dockerfile
• Mysql Dockerfile
• Postgres Dockerfile

my 2cents

from docker.

It was in an email from official image approvers.

If those other ones are doing it, then we should here too, I agree.

The main problem is that people aren't reading the docs on docker volume
management.

On Saturday, September 27, 2014, spiddy [email protected] wrote:

Hi,

can you put a reference to the suggestion of not placing volumes in the
Dockerfiles?

It's true, volumes can't be removed by dependent Dockerfiles, but that's
by design. I can't think of a use case that it is necessary to keep the
data inside a living jenkins container, that would break any possible
upgrading patterns. (

In general, most official repos do have a volume defined, so that the data
are stored separately from the container. I put some examples below:

• Redis Dockerfile
  https://github.com/docker-library/redis/blob/ffb29617e5dcfe71adf67842d18063c410beede7/2.8.9/Dockerfile
• Mysql Dockerfile
  https://github.com/docker-library/mysql/blob/7461a52b43f06839a4d8723ae8841f4cb616b3d0/5.7/Dockerfile
• Postgres Dockerfile
  https://github.com/docker-library/postgres/blob/33b8046b5f68b465a3c04fcc428e8923bcb7cd12/9.3/Dockerfile

my 2cents

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Michael D Neale
home: www.michaelneale.net
blog: michaelneale.blogspot.com

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