Creating a Docker Container to Run AS3 Declarations

Hi,

Very nice article! Not easy to figure out for beginner like me, so have few questions.

I am maybe wrong but there are some missing pieces and small errors:

In installation section after

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

it seems that

sudo apt-get update

is missing. Without this step Docker install failed on my side (but I am using Ubuntu 16.0.4)

In Python script there is typo (at least without correction I was not able to run this script)

 Check we have connectivity and AS3 is installed
print(' Checking that AS3 is running on ', IP ,' ')
url = URLBASE + TESTPATH>

I changed it to:

url = URLBASE + TESTPATH

- so > should be removed?

I was not as well sure how to perform docker build command. My steps were:

• Created as3 folder in home
• Placed as3.py, Dockerfile and requirements.txt in this folder
• cd as3
• Run your version of command - it failed with message about missing arguments (if I can recall) So I used this version (added dot):

  docker build . -t runciblespoon/as3_python:A --build-arg Username=$XUSER --build-arg Password=$XPASS

Wonder if my corrections are OK?

I have as well few questions about how your example can be modified. Just would like to make it more generic/universal:

Passing BIG-IP MGMT IP:port to the Python script. I think it can be done using similar approach as for Username and Password via

--build-arg

, just not sure what needs to be modified. My guess is I should add something like that in Dockerfile:

ARG Mgmntip=10.10.10.10

ENV XIP=$Mgmntip

then in python script:

IP = os.environ['XIP']

and finally in

docker build

command add

--build-arg Mgmtip=192.168.10.1

I am not sure if this is necessary to use

export XIP=192.168.10.1

and then in

--build-arg Mgmtip=$XIP

?

If above is correct then I assume that same approach can be taken to pass GITDRC? Something like (in python script):

GITDRC = 'https://raw.githubusercontent.com/RuncibleSpoon/as3/master/declarations/' + os.environ['XJSON']

of course after XJSON is set in Dockerfile and passed via

--build-arg

Last but not least, in Dockerfile there is:

ARG DecURL=https://raw.githubusercontent.com/RuncibleSpoon/as3/master/declarations/payload.json
ENV Declaration=$DecURL

Is that used anywhere?

Sorry for so many questions but as I said it's all new to me.

EDIT: You can disregard my questions about passing values at

docker build

stage - checked and it's working 🙂

But it is not as universal as I expected, so question is if there is a way to pass arguments at the

docker run

stage?

EDIT 2: Quite stupid to answer own questions 🙂 Figured out how to pass all necessary vars at

docker run

stage, just used

--env-file

, working like a charm!

Piotr