I have this scenarios happening in my bucket, I have file called red.dat in my storage and this file will be updating regularly by jenkins once this file has been update I trigger event to deploy this red.dat file, I want check md5 hash of the file before and after update and if the value is different only do the deployment
this is how I upload the file to GCS
gsutil cp red.dat gs://example-bucket
and I have tried this command to get hash
gsutil hash -h gs://example-bucket/red.dat
and the result is this
Hashes [hex] for red.dat:
Hash (crc32c): d4c9895e
Hash (md5): 732b9e36d945f31a6f436a8d19f64671
but I'm little confused how I can implement to compare md5 before and after update since the file is always gonna be stay remote location(GCS). I would like some advice or show me right direction to achieve this, solution in commands or ansible is fine
You can use the gsutil hash command on the local file, and then compare the output with what you saw from gsutil hash against the cloud object:
gsutil hash red.dat
Related
I need to "move" all the content of a folder, including its subfolders to a bucket in Google Cloud Storage.
The closest way is to use gsutil -rsync, but it clones all the data without moving the files.
I need to move all the data and keep data only in GCP and not in local storage. My local storage is being used only as a pass-thought server (Cause I only have a few GB to store data on local storage)
How can I achieve this?
Is there any way with gsutil?
Thanks!
To move the data to a bucket and reclaim the space on your local disk, you need to use mv command for example:
gsutil mv -r mylocalfolder gs://mybucketname
mv command copies the files to a bucket and delete them after the upload.
I have a folder structure like
Test
Test2
Test2-1.jpg
Test2-2.png
Using cp command I am able to copy the local structure to the S3 bucket. But I have a server configured to access files like this in a bucket
Test2/Test2-1.jpg, because I have copied it using cp command from a local directory, I can't set the key to Test2/Test2-1.jpg.
Before I was copying each and every file manually through Boto API by setting Key manually. That worked but its very long process.
Is there any way I can achieve this using cp command?
EDIT:
The actual issue causing the problem was content-encoding gzip. I was passing this encoding for not gz file. Due to that, the file is not stored properly and accessible.
If you are in a directory with Test2-1.jpg in it you can copy it to yourbucket/Test2/Test2-1.jpg by running
aws s3 cp ./Test2-1.jpg s3://yourbucket/Test2/Test2-1.jpg
You can copy an entire directory by using the sync command
aws s3 sync . s3://yourbucket/Test2/
Is there a way to make gsutil rsync remove synced files?
As far as I know, normally it is done by passing --remove-source-files, but it does not seem to be an option with gsutil rsync (documentation).
Context:
I have a script that produces a large amount of CSV files (100GB+) I want those files to be transferred to Cloud Storage (and once transferred to be removed from my HDD).
Ended up using gcsfuse.
Per documentation:
Local storage: Objects that are new or modified will be stored in
their entirety in a local temporary file until they are closed or
synced.
One work-around for small buckets is delete all bucket contents and re-sync periodically.
I am using GCS Transfer Service to move objects from S3 into GCS, I then have a ruby script on GAE that downloads the new GCS object and operates on it. The script fails to download because the MD5 and CRC32C hash verification fails. The verification (part of the google-cloud-storage gem) works by comparing the object.md5 and object.crc32c hashes to the file's calculated hashes, but these are mismatched.
I downloaded the file from AWS and calculated the md5 and crc32c hashes and I got the same value that the file attributes on GCS has: object.md5 and object.crc32c, however when I download directly from GCS and calculate the hashes, I get different md5 and crc32c hashes.
To replicate this:
Calculate the hash of an AWS object
Transfer the object to GCS via the transfer service
Pull the attributed GCS object hashes using: gsutil ls -L gs://bucket/path/to/file
Calculate the hashes of the GCS object
The error that I originally got was:
/usr/local/bundle/gems/google-cloud-storage-0.23.2/lib/google/cloud/storage/file/verifier.rb:34:in `verify_md5!': The downloaded file failed MD5 verification. (Google::Cloud::Storage::FileVerificationError)
from /usr/local/bundle/gems/google-cloud-storage-0.23.2/lib/google/cloud/storage/file.rb:809:in `verify_file!'
from /usr/local/bundle/gems/google-cloud-storage-0.23.2/lib/google/cloud/storage/file.rb:407:in `download'
from sample.rb:9:in `'
My Amazon S3 bucket has millions of files and I am mounting it using s3fs. Anytime a ls command is issued (not intentionally) the terminal hangs.
Is there a way to limit the number of results returned to 100 when a ls command is issued in a s3fs mounted path?
Try goofys (https://github.com/kahing/goofys). It doesn't limit the number of item returned for ls, but ls is about 40x faster than s3fs when there are lots of files.
It is not recommended to use s3fs in production situations. Amazon S3 is not a filesystem, so attempting to mount it can lead to some synchronization issues (and other issues like you have experienced).
It would be better to use the AWS Command-Line Interface (CLI), which has commands to list, copy and sync files to/from Amazon S3. It can also do partial listing of S3 buckets by path.