How does AWS Beanstalk use NPM when deploying a Nodejs App?

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醉酒成梦
醉酒成梦 2021-02-18 19:19

I\'m curious about the overall workflow of an AWS Beanstalk deployment. I\'m assuming it runs npm at some point to get the packages installed on the server(s). But I was just wo

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  • 2021-02-18 19:29

    In the new versions of Elastic Beanstalk Node's stacks, the configuration has changed, as pointed by @etreworgy's comment.

    You can check the current behavior, by running inside an EC2 instance:

    cat /opt/elasticbeanstalk/containerfiles/ebnode.py | grep -A 5 PRODUCTION
    

    It returns, as of today:

            if 'NPM_USE_PRODUCTION' not in npm_env:
                npm_env['NPM_USE_PRODUCTION'] = 'true'
    
            if npm_env['NPM_USE_PRODUCTION'] == 'true':
                print 'Running npm with --production flag'
                check_call([npm_path, '--production', 'install'], cwd=app_path, env=npm_env)
                check_call([npm_path, '--production', 'rebuild'], cwd=app_path, env=npm_env)
            else:
                print 'Running npm without --production flag'
    

    So, currently, it uses the npm install --production by default.

    For those ones that want to disable it (as I was when I went to this answer), you have to create a anything.config inside an .ebextensions folder at your project's root folder (where anything means really anything; node, npm, whatever you want), with the content:

    option_settings:
        - namespace: aws:elasticbeanstalk:application:environment
          option_name: NPM_USE_PRODUCTION
          value: false
    
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  • 2021-02-18 19:33

    Currently the Elastic Beanstalk environment runs npm install without the --production flag. This happens on the instance at /opt/elasticbeanstalk/containerfiles/ebnode.py before any env customizations supplied by the developer (i.e., environment option settings) are exported, which means setting NODE_ENV=production in the EB Environment's configuration also does not prevent devDependencies from being processed.

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  • 2021-02-18 19:36

    An additional option is to use npm-shrinkwrap, which has the additional benefit of letting you lock your dependencies at the same time.

    AWS Elastic Beanstalk suggests it here.

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  • 2021-02-18 19:45

    You can get AWS Elastic Beanstalk to run npm install in production mode if you set the environment variable NPM_CONFIG_PRODUCTION=true. You can do this through the Elastic Beanstalk web console.

    Alternatively, save the following text to any file with suffix .config inside a directory called .ebextensions in the project root and you can achieve the same thing without having to set them every time in the web console:

    option_settings:
    
      - option_name: NPM_CONFIG_PRODUCTION
        value: true
    

    Note: make sure you're using spaces, not tabs, as it's YAML format.

    I found that the time to update new node.js code in a t1.micro environment went down from about 5 minutes to 90 seconds, now that it wasn't installing all the devDependencies such as grunt, karma, mocha, etc.

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