CODEWITHSUNDEEP
pythonaws-cdk
jim
jim

Reputation: 456

How to assign "app":"python app.py" in cdk.json for python or python3

I am fairly new to cdk. How do I set up cdk or cdk.json to run where the python executable may be named 'python' or 'python3' depending on the platform ?

cdk init --language python creates the cdk.json on my local Windows PC with the line

"app": "python app.py"

The failure occurs when Jenkins CI/CD executes the application. Jenkins build fails because the linux based Jenkins expects 'python3'.

Current solution is to edit cdk.json when we commit to github and Jenkins auto builds the lower environments. Is there a better way?

Upvotes: 0

Views: 2159

Answers (2)

Catharina Oliveira
Catharina Oliveira

Reputation: 31

I had a few problems, but in the end, using python3 in the cdk.json file made no difference. I have a windows OS. The pre-requisites were:

Having this, I executed the line below in my windows terminal

npm install -g aws-cdk

Next step in my project (I use vscode), I created a folder to execute cdk (and I named it "cdk" but it could be anything).

  • mkdir cdk (to create my folder in the project)
  • cd cdk (to enter in my folder)
  • cdk init app --language python (to set the language)
  • source .venv/bin/activate (to create and activate the virtual environment)
  • add "aws_cdk.aws_s3" in the requirements.txt

Before executing cdk deploy, execute the pip install -r requirements.txt and use cdk synth to test if everything is ok or if some error must be corrected.

When using git actions, use sudo before the npm command and add in the run command the cd so git can navigate until the cdk folder. Without those, I had the error that follows. --app is required either in command-line, in cdk.json or in ~/.cdk.json

Here's how the deploy job was configurated in my git actions file:

jobs: 
  
  deploy:
    runs-on: ubuntu-latest          
    steps:
    - uses: actions/checkout@v2   
    - name: Set up Python           
      uses: actions/setup-python@v2 
      with: 
        python-version: '3.x'          
    - uses: actions/setup-node@v2-beta
      with: 
        node-version: '12'        
    - name: Install dependencies
      run: |                  
        sudo npm install -g aws-cdk   
        cd 2_continuous_integration_and_tests/CDK
        pip install -r requirements.txt   
    - name: Deploy    
      env:
        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}      
        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        AWS_DEFAULT_REGION: ${{ secrets.AWS_DEFAULT_REGION }}
      run: | 
        cd 2_continuous_integration_and_tests/CDK
        cdk synth
        cdk deploy

Kind regards ;)

Upvotes: 1

vumdao
vumdao

Reputation: 621

Using python3 directly in cdk.json:

{
  "app": "python3 app.py",
  "context": {
    "@aws-cdk/core:enableStackNameDuplicates": "true",
    "aws-cdk:enableDiffNoFail": "true",
    "@aws-cdk/core:stackRelativeExports": "true",
    "@aws-cdk/aws-ecr-assets:dockerIgnoreSupport": true
  }
}

Or alias python symlink to python3:

lrwxrwxrwx 1 root root 18 Nov  8 14:20 /usr/bin/python -> /usr/bin/python3.8

Upvotes: 1

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