fs.writeFile - permission issue on GCP (Google Cloud Run)

error on this:

fs.writeFile(fileName, pdfBytes, err => {
          if (err) {
            console.log(err.message)
            reject(err.message)
          } else resolve(fileName)
        })

#1 It looks like when deployed into Cloud Run it also requires the extra permission "Service Account Token Creator" to run getSignedUrl. Locally for some reason this role is not required.

#2 Only the directory /tmp is writable in Cloud Run. So, change the default write location to write into this directory.

However, you have to be aware of 2 things:

Cloud Run is stateless, that means when a new instance is created, the container start from scratch, with an empty /tmp directory
/tmp directory is an in-memory file system. The maximum allowed memory on Cloud Run is 2Gb, your app memory footprint included. In addition of your file and Airflow, not sure that you will have a lot of space.

A final remark. Cloud Run is active only when it process request, and a request has a maximum timeout of 15 minutes. When no request, the allowed cpu is close to 0%. I'm not sure of what you want to achieve with Airflow on Cloud Run, but my feeling tells me that your design is strange. And I prefer to warn you before you spend too much effort on this.

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Andmapco - dev team

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