Using host env variable with docker remote API

Question

I'm trying to use the target host's env variable to parametrize my container when launching it with the remote API, but none of these worked ...

   "Env": [
        "ENV_VAR=`$TEST`",
        "ENV_VAR2=$TEST"
   ],

Does anyone have an idea how to achieve this ?

What is not working: $TEST has not the right value? Or ENV_VAR is not defined at all? — VonC, Feb 05 '16 at 07:50
ENV_VAR is set, with the litteral strings \`$TEST\` and $TEST respectivly. — pedro, Feb 05 '16 at 09:36
I'm feeding a json while POSTing to : /containers/create?name=myName -d payload.json ("Env" being in the root of the payload) — pedro, Feb 05 '16 at 09:51

score 0 · Answer 1 · edited Mar 20 '17 at 10:18

0

I'm feeding a json while POSTing to : /containers/create?name=myName -d payload.json ("Env" being in the root of the payload)

If $TEST is an environment variable from the host, the payload.json needs to include its value, not $TEST, as the POST will not change/interpret $TEST (but pass it literally).

If, instead of using a payload.json file, you used a command with the json directly in it, you could wrap the json part between double quotes: then $TEST would be interpreted by the shell.
See "How to include environment variable in bash line CURL?"

edited Mar 20 '17 at 10:18

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answered Feb 05 '16 at 10:33

VonC

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The environment variable is meant to be taken from the target host, not the client using the remote API – pedro Feb 05 '16 at 12:05
@pedro the remote API itself is not like a shell: it won't interpret anything. – VonC Feb 05 '16 at 12:15
Yeah i understand that, but there could have been a way for the remote docker to start the container using its host env ..., thanks anyway for you time. – pedro Feb 05 '16 at 13:29

Using host env variable with docker remote API

1 Answers1