Beanstalk: Node.js deployment – node-gyp fails due to permission denied

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Solution

The solution is to add the file .npmrc to the application with the content:

# Force npm to run node-gyp also as root, preventing permission denied errors in AWS with npm@5
unsafe-perm=true

(Or configuring npm so in any other way. (Though setting npm_config_unsafe_perm=true in /opt/elasticbeanstalk/env.vars did not work for me.)

Explanation

npm install is run by the root user but the node-gyp process it triggers for some packages is run by the default user ec2-user. This user lacks access to the /tmp/deployment/application/node_modules/ directory created by the npm install run and owned by root. (And it likely also lacks access to /tmp/.npm and /tmp/.config created by the same.) By enabling unsafe-perm we force npm to run node-gyp also as root, avoiding the problem.

(Personally I would prefer to run all as ec2-user rather than root but I guess that would be more involved :-))

Credits

unreal0 has pointed me to the solution

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