aws-codepipeline-cfn-provider

CodePipeline built-in cfn provider has a limitation that a cfn template size can't exceed 51kb.

aws-codepipeline-cfn-provider solves this problem by providing an alternative cfn provider implemented as a Lambda.

Instead of passing templates directly, it uploads templates to s3 bucket before creating a stack so it can be used to deploy stacks from templates with size > 51kb.

Requirements

Lambda requires an s3 bucket used to store cfn templates. The bucket name is set by PIPELINE_TEMPLATES_BUCKET environment variable.

Deployment

aws-codepipeline-cfn-provider uses Pipenv to manage Python dependencies.

Create virtualenv and install dependencies

pipenv --three
pipenv install

Upload zip to an S3 bucket

Modify bucket name and bucket key in s3_deploy.sh script Run s3_deploy.sh to generate a zip package and upload file to S3 bucket.

Lambda

Create a Lambda in AWS console using zipped package from s3 bucket. Lambda handler name should be set to: pipeline_lambda/pipeline_lambda.handler

IAM permissions

aws-codepipeline-cfn-provider requires at least the following permissions:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "codepipeline:PutJobFailureResult",
                "codepipeline:PutJobSuccessResult"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
        {
            "Action": [
                "cloudformation:DescribeStacks",
                "cloudformation:DeleteStack",
                "cloudformation:CreateStack",
                "cloudformation:UpdateStack",
                "cloudformation:DescribeChangeSet",
                "cloudformation:CreateChangeSet",
                "cloudformation:ExecuteChangeSet",
                "cloudformation:SetStackPolicy",
                "cloudformation:DeleteChangeSet",
                "iam:PassRole"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
        {
            "Action": [
                "s3:GetObject",
                "s3:PutObject"
            ],
            "Resource": [
                "arn:aws:s3:::your-pipeline-templates-bucket/*"
            ],
            "Effect": "Allow"
        },
        {
            "Action": [
                "s3:GetBucketLocation"
            ],
            "Resource": [
                "arn:aws:s3:::your-pipeline-templates-bucket"
            ],
            "Effect": "Allow"
        }
    ]
}

UserParameters

User parameters are used to configure lambda and should be passed in a JSON format:

{
    "ActionMode": "operation_name", [CREATE_UPDATE, DELETE_ONLY, CHANGE_SET_REPLACE, CHANGE_SET_EXECUTE]
    "StackName": "stack_name",
    "ChangeSetName": "change_set_name",
    "TemplatePath": "ArtifactName::TemplateFile",
    "ConfigPath": "ArtifactName::ConfigFile",
    "RoleArn": "cfn_role_arn",
    "OutputFileName": "artifact_output_file_name" (output.json is default),
    "ParameterOverrides": {"param": "value"}
    "Capabilities": ["CAPABILITY_NAMED_IAM", "CAPABILITY_IAM"] list or string
}

Lambda environment

• PIPELINE_TEMPLATES_BUCKET - S3 bucket used to upload cfn templates to

Examples

Pipeline examples

Create stack

Create and execute change set with manual approvement

Configuration examples

Delete stack:

{
    "StackName": "test_stack",
    "ActionMode": "DELETE_ONLY,
    "RoleArn": "cfn_role_arn",

}

Create or update stack:

{
    "ActionMode": "CREATE_UPDATE",
    "StackName": "test_stack",
    "RoleArn": "cfn_role_arn",
    "TemplatePath": "MyApp::template.json",
    "ConfigPath": "MyApp::config.json",
    "ParameterOverrides": {
        "param1": "value1",
        "param2": { "Fn::GetParam" : [ "MyApp", "config2.json", "param2" ] }
    }
}

Create change set:

{
    "ActionMode": "CHANGE_SET_REPLACE",
    "StackName": "test_stack",
    "ChangeSetName": "test_change_set",
    "RoleArn": "cfn_role_arn",
    "TemplatePath": "MyApp::template.json",
    "ConfigPath": "MyApp::config.json",
    "ParameterOverrides": {
        "param1": "value1",
        "param2": { "Fn::GetParam" : [ "MyApp", "config2.json", "param2" ] }
    }
}

Execute change set:

{
    "ActionMode": "CHANGE_SET_EXECUTE",
    "StackName": "test_stack",
    "ChangeSetName": "test_change_set",
    "RoleArn": "cfn_role_arn"
    "OutputFileName": "out.json"
}

LICENCE

Apache License 2.0

Copyright Nordcloud OY