+++
title = "Create New Pipeline"
weight = 130
+++

## Define an Empty Pipeline
Now we are ready to define the basics of the pipeline.


Return to the file `pipeline_stack.py` and edit as follows:

{{<highlight python "hl_lines=5 17-29">}}
from constructs import Construct
from aws_cdk import (
    Stack,
    aws_codecommit as codecommit,
    pipelines as pipelines,
)

class WorkshopPipelineStack(Stack):
    def __init__(self, scope: Construct, id: str, **kwargs) -> None:
        super().__init__(scope, id, **kwargs)

        # Creates a CodeCommit repository called 'WorkshopRepo'
        repo = codecommit.Repository(
            self, "WorkshopRepo", repository_name="WorkshopRepo"
        )

        pipeline = pipelines.CodePipeline(
            self,
            "Pipeline",
            synth=pipelines.ShellStep(
                "Synth",
                input=pipelines.CodePipelineSource.code_commit(repo, "main"),
                commands=[
                    "npm install -g aws-cdk",  # Installs the cdk cli on Codebuild
                    "pip install -r requirements.txt",  # Instructs Codebuild to install required packages
                    "cdk synth",
                ]
            ),
        )
{{</highlight>}}

### Component Breakdown
The above code does several things:

* `pipelines.CodePipeline(...)`: This initializes the pipeline with the required values. This will serve as the base component moving forward. Every pipeline requires at bare minimum:
    * `pipelines.ShellStep(...)`: The `synth` of the pipeline describes the commands necessary to install dependencies, build, and synth the CDK application from source. This should always end in a *synth* command, for NPM-based projects this is always `npx cdk synth`.
      * The `input` of the synth step specifies the repository where the CDK source code is stored.

## Deploy Pipeline and See Result
All that's left to get our pipeline up and running is to commit our changes and run one last cdk deploy.

```
git add .
git commit -m "MESSAGE" && git push
cdk deploy
```

CdkPipelines auto-update for each commit in a source repo, so this is the *last time* we will need to execute this command!

Once deployment is finished, you can go to the [CodePipeline console](https://console.aws.amazon.com/codesuite/codepipeline/pipelines) and you will see a new pipeline! If you navigate to it, it should look like this:

![](./pipeline-init.png)