AWS Elastic Beanstalk - switching environment variables between environments - amazon-web-services

Question

I am using Elastic Beanstalk's aws:elasticbeanstalk:application:environment namespace to configure my environment with env vars. How can I set different values for different environments (e.g. development versus production)?
Development:
option_settings:
aws:elasticbeanstalk:application:environment:
REDIS_HOST: localhost
Production:
option_settings:
aws:elasticbeanstalk:application:environment:
REDIS_HOST: prod.redis.server.com

Answer 1

The AWS CLI has a convenient way of doing this for you as the update-environment command allows you to set env vars from a specially formatted json file. Create a separate json file for each environment you will be deploying to.
Example json file named deploy-dev.json:
[
{
"Namespace": "aws:elasticbeanstalk:application:environment",
"OptionName": "NODE_ENV",
"Value": "dev"
},
{
"Namespace": "aws:elasticbeanstalk:application:environment",
"OptionName": "LOG_LEVEL",
"Value": "silly"
}
]
Deploy app and then update env vars:
aws elasticbeanstalk create-application-version --application-name "$EB_APP_NAME" --version-label "$EB_VERSION"
aws elasticbeanstalk update-environment --environment-name "$EB_ENV_NAME" --version-label "$EB_VERSION" --option-settings file://.ebextensions/deploy-dev.json

Answer 2

How it's changed depends on your deployment method.
One option you can use is to set a bogus value in your .config file:
option_settings:
aws:elasticbeanstalk:application:environment:
REDIS_HOST: change me
Then, after deployment, modify the variable either using the AWS Management Console or using the EB CLI:
eb setenv REDIS_HOST=prod.redis.server.com
If you are using CloudFormation to deploy your EB application, you can feed the value as part of the OptionSettings field in your CloudFormation template:
"EBConfigurationTemplate" : {
"Type" : "AWS::ElasticBeanstalk::ConfigurationTemplate",
"Properties" : {
"ApplicationName" : {
"Ref" : "EBApplication"
},
"Description" : "Configuration Template",
"OptionSettings" : [
{
"Namespace" : "aws:elasticbeanstalk:application:environment",
"OptionName" : "REDIS_HOST",
"Value" : {
"Ref" : "RedisHostInputParameter"
}
},
]
There are probably other methods too, but they will depend on the method of deployment.