Thursday 22 February 2018

Parameter Store in AWS

Using the parameter store in AWS is pretty straight forward.  You can use the command line to get and put parameters and therefore not have to store them in source control.  You can use the IAM roles in AWS to limit access to the values.

Find the Parameter Store by logging in to the AWS console and navigating to

Services - Systems Manager - Parameter Store (Left panel)

Put Parameter

There are a number of types of value that can be stored in the parameter store.  String, StringList and SecureString.  To put a parameter use

aws ssm put-parameter --region <region> --name <parameterName> --type SecureString --value "my secure value"

To store the contents of a file you can use

aws ssm put-parameter --region <region> --name <parameterName> --type SecureString --value file://my_file_to_store.anything

Get Parameter

Use the simple command line to get a parameter value.

aws ssm get-parameter --region <region> --name <parameterName>

If you SecureString was used as a type then the --with-decryption value can be used to see the actual value.

aws ssm get-parameter --region <region> --name <parameterName> --with-decryption

This output in json isn't always useful.  A --query parameter can be added to specify the actual output needed

aws ssm get-parameter --region <region> --name <parameterName> --with-decryption --query Parameter.Value

Add | cut -d "\"" -f 2 to remove the quotes and using 'echo -e' will restore any line breaks which are encoded as \n

Similarly if a profile is needed then --profile <profileName> can be used

IAM Role

To allow access the arn:aws:iam::aws:policy/AmazonSSMReadOnlyAccess role can be added to a instance that needs to have read-only access.

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