Mounting volumes into Docker

[ev...@evanw.net]

Hi All!

I'm quite new to this, and was trying to map a local folder /home/evan/code into a docker image, to test sharing code between the two. I have the following code below, however it seems the entire local root volume is trying to be mounted into /tmp/code. Is this by design ? The container is running as root, however of course my local folder is owned by my user - if that is effecting things potentially ?. How do I simply mount the local folder /home/evan/code to /tmp/code inside of the container ?

Many thanks!

/dev/mapper/mint--vg-root  213G   12G  191G   6% /tmp/code

"builders": [{
	"type": "docker",
	"image": "centos",
	"commit": true,
	"pull": true,
	"changes": [
	"VOLUME /home/evan/code /tmp/code"
	]
	}],

[Rickard von Essen]

I think you are looking for *) volumes, changes VOLUMES will only affect the resulting image.

*) https://packer.io/docs/builders/docker.html#volumes

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[ev...@evanw.net]

Thanks for the reply. There is no documented examples that I can see, for using VOLUMES. Would you be able to point me in the right direction with some sample code ? :)

[Alvaro Miranda Aguilera]

try

"builders": [{
	"type": "docker",
	"image": "centos",
	"commit": true,
	"pull": true,

	"volumes": [
	"/home/evan/code": "/tmp/code"
	]
	}],

alvaro

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Alvaro

[Rickard von Essen]

These options (as most in Packer) are just passed to the underlying tool and is best understood by reading the docs of the tool, and experimenting with it without Packer.

See https://docs.docker.com/engine/reference/commandline/commit/#parent-command

And https://docs.docker.com/storage/volumes/#choose-the--v-or---mount-fla

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[ev...@evanw.net]

Hi,

I'm still really struggling with this unfortunately. After reading the docker documentation on volumes (-v), it seems I still can't get the required packer syntax correct.

The following, manages to create /root/dockershare inside of the container (and if it doesn't exist on the host, it will create it as well). However, if I create a file on the host, it simply doesn't appear inside the container (and vise-versa).

Am I misunderstanding something fundamental here ? 

2018/11/21 09:15:55 packer: 2018/11/21 09:15:55 Starting container with args: [run -v /home/root/dockershare:/root/dockershare

"builders": [{

"type": "docker",

"image": "ubuntu",

"commit": true,

"pull": true,

  "volumes": {"/home/root/dockershare": "/root/dockershare"}

Many thanks!