Unable to access AWS: "Unable to find remote file. Ensure file exists and path is valid"

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bc
bc 2022-12-14
回答： Swastik Sarkar 2024-8-30
Unable to read from S3 from local docker container.
e.g.
>> fileread('s3://{BUCKET_NAME}/{PATH_TO_FILE}')
Error using fileread (line 23)
Could not open file s3://{BUCKET_NAME}/{FILE_PATH}.json. Unable to find remote file. Ensure file exists and path is valid..
I have bound a valid AWS credentials and config file to ~/.aws. I have also set all environment variables too:
setenv('AWS_ACCESS_KEY_ID', '******')
setenv('AWS_SECRET_ACCESS_KEY', '******')
setenv('AWS_DEFAULT_REGION', 'us-east-1')
setenv('AWS_SESSION_TOKEN','******')
setenv('AWS_SHARED_CREDENTIALS_FILE', '/root/.aws/credentials')
I am able to use system command to interact with S3:
>> system '~/.local/bin/aws s3 ls {BUCKET_NAME}'
2022-12-09 11:10:37 4204 *******.json
2022-12-13 15:10:57 4203 *******.json
2022-12-13 15:10:57 216790 *******.csv
2022-12-13 15:10:57 216786 *******.csv
Please help! NB: this is only an issue when running locally, the code works when running on an EC2 instance... Im thinking could it be a certificate issue? Is there a way I can force matlab to use installed certificates?

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回答（1 个）

Swastik Sarkar
Swastik Sarkar 2024-8-30
Hi @bc,
The webread  function can be used to access files stored in an S3 bucket. To access a file from an S3 bucket, the webread function can be utilized as follows:
URL = "https://s3.amazonaws.com/{BUCKET_NAME}/{PATH_TO_FILE}";
options = weboptions('ContentType', 'text');
data = webread(URL, options);
For more information on using webread, refer to the below documentation:
https://www.mathworks.com/help/matlab/ref/webread.html

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