How do you write to the file system of an aws lambda instance?

Question

I am unsuccessfully trying to write to the file system of an aws lambda instance. The docs say that a standard lambda instance has 512mb of space available at /tmp/

Answer 1

So the answer lies in the context.fail() or context.succeed() functions. Being completely new to the world of aws and lambda I was ignorant to the fact that calling any of these methods stops execution of the lambda instance.

According to the docs:

The context.succeed() method signals successful execution and returns a string.

By eliminating these and only calling them after I had run all the code that I wanted, everything worked well.

Answer 2

Modifying your code into the Lambda template worked for me. I think you need to assign a function to exports.handler and call the appropriate context.succeed() or context.fail() method. Otherwise, you just get generic errors.

var fs = require("fs");

exports.handler = function(event, context) {
    fs.writeFile("/tmp/test.txt", "testing", function (err) {
        if (err) {
            context.fail("writeFile failed: " + err);
        } else {
            context.succeed("writeFile succeeded");
        }
    });
};