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Inject AWS SSM Parameters as Environment Variables

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gmr/env-aws-params

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env-aws-params is a tool that injects AWS EC2 Systems Manager (SSM)Parameter StoreKey / Value pairs asEnvironment Variableswhen executing an application. It is intended to be used as a DockerEntrypoint,but can really be used to launch applications outside of Docker as well.

The primary goal is to provide a way of injecting environment variables for12 Factor applications that have their configuration definedin the SSM Parameter store. It was directly inspired byenvconsul.

Example Usage

Create parameters in Parameter Store:

aws ssm put-parameter --name /service-prefix/ENV_VAR1 --value exampleaws ssm put-parameter --name /service-prefix/ENV_VAR2 --value test-value

Then useenv-aws-params to have bash display the env vars it was called with:

env-aws-params --prefix /service-prefix /bin/bash -cset

If you want to include common and service specific values,--prefix can be specifiedmultiple times:

env-aws-params --prefix /common /bin/bash -cset

To get a plaintext output of your environment variables to use with other utilities, we can useprintenv:

env-aws-params --pristine --silent --prefix /service-prefix /usr/bin/printenv>~/some-file.sh

Which will write your environment variables in plain text, for example:

# ~/some-file.sh Contents:ENV_VAR1=exampleENV_VAR2=test-value

CLI Options

NAME:   env-aws-params - Application entry-point that injects SSM Parameter Store values as Environment VariablesUSAGE:   env-aws-params [global options] -p prefix command [command arguments]COMMANDS:     help, h  Shows a list of commands or help for one commandGLOBAL OPTIONS:   --aws-region value        The AWS region to use for the Parameter Store API [$AWS_REGION]   --prefix value, -p value  Key prefix that is used to retrieve the environment variables - supports multiple use   --pristine                Only use values retrieved from Parameter Store, do not inherit the existing environment variables   --sanitize                Replace invalid characters in keys to underscores   --strip                   Strip invalid characters in keys   --upcase                  Force keys to uppercase   --debug                   Log additional debugging information [$PARAMS_DEBUG]   --silent                  Silence all logs [$PARAMS_SILENT]   --help, -h                show help   --version, -v             print the version

Building

This project usesgo modules. To build the project:

go mod downloadgo mod verifygo build

Building an environment is also provided as a docker image based on Alpine Linux. See the Dockerfile for more information.

docker build -t env-aws-params;# Build the imagedocker run --rm -it -v$HOME/.aws/:/root/.aws/ env-aws-params [your options]
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