How to add an environment variable to AWS Lambda without removing what's there?

user_1027004 0
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Is there a way to add a new environment variable to an AWS Lambda function without removing the ones already there?

(With the command line tools, that is.)

aws-lambda amazon-web-services
2 Answers

Using the Lambda Console you can just append new Environmental variables:

enter image description here

Doing it using the CLI is harder- aws lambda update-function-configuration allows you to selectively update aspects of a lambda, but does not have helper methods to append enviornment variables. You can use aws lambda get-function-configuration to get the current list of enviornment variables. Which could be used in tandem with some bash/powershell scripting (or language of your choice using the matching SDK functions).

For example:

const AWS = require('aws-sdk');
const lambda = new AWS.lambda();

const FunctionName = 'FUNCTION_NAME';
const AppendVars = { key: value };

async function appendVars() {
  const { Environment: { Variables } } = await lambda.getFunctionConfiguration({ FunctionName }).promise();
  await lambda.updateFunctionConfiguration({
    FunctionName,
    Environment: { Variables: { ...Variables, ...AppendVars } },
  }).promise();
}

appendVars();
user_25311320

I successfully used this as a bash script.

The name of the lambda function is coming in from a parameter. My goal was to simple change a variable so to restart the lambda function.

LAMBDA=$1

CURRENTVARIABLES=$(aws lambda get-function-configuration --function-name $LAMBDA | jq '.Environment.Variables')
NEWVARIABLES=$(echo $CURRENTVARIABLES | jq '. += {"kick":"'$(getrandom 8)'"}')
COMMAND="aws lambda update-function-configuration --function-name $LAMBDA --environment '{\"Variables\":$NEWVARIABLES}'"
eval $COMMAND
user_117041290
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