This documentation says that quote:
create a bucket with folders
IIUC S3 does not have folders. We can simulate folders by including the folder name in the object key like this:
folder1/key1.json
folder1/key2.json
Is my understanding correct?
you are correct - there are no real folders, they are just simulated based on the object key having the slash in its name.
Related
I have a folder "Execution" folder in s3 bucket.
It has folders and files like
Execution
Exec_06-06-2022/
file1.json
file2.json
Exec_07-06-2022/
file3.json
file4.json
I need to configure to delete the Exec_datestamp folders and the inside files after X days.
I tried this using AWS lifecycle config for the prefix "Execution/"
But it deletes the folder Execution/ after X days ( set this to 1 day to test)
Is there any other way to achieve this?
There are no folders in S3. Execution is part of objects name, specifically its key prefix. The S3 console only makes Execution to appear as a folder, but there is no such thing in S3. So your lifecycle deletes Execution/ object (not folder), because it matches your query.
You can try with Execution/Exec* filter.
Got it, https://stackoverflow.com/a/41459761/5010582. The prefix has to be "Execution/Exec" without any wildcard.
We know that in S3 objects, the folder path is just a part of the object key itself.
Having an object structure similar to the following:
/files/user/09874/01/
/files/user/09875/01/
/files/user/09875/02/
/files/user/09876/01/
/files/user/09876/02/
What kind of operation would you recommend to rename the parent /files/ to /something/, having in mind that there are thousands of files and that the number of requests should be the cheapest/minimum?
(with the following docs under consideration)
As you said prefix are part of the file name. Unfortunately, The only way that i can think of is to iterate the list of objects and move to the new prefix.
in cli:
aws s3 mv --recursive s3://bucket/files s3://bucket/something/
I am trying to list all items with specific prefix in S3 bucket. Here is directory structure that I have:
Item1/
Item2/
Item3/
Item4/
image_1.jpg
Item5/
image_1.jpg
image_2.jpg
When I set prefex to be Item1/Item2, I get as a result following keys:
Item1/Item2/
Item1/Item2/Item3/Item4/image_1.jpg
Item1/Item2/Item3/Item5/image_1.jpg
Item1/Item2/Item3/Item5/image_2.jpg
What I would like to get is:
Item1/Item2/
Item1/Item2/Item3
Item1/Item2/Item3/Item4
Item1/Item2/Item3/Item5
Item1/Item2/Item3/Item4/image_1.jpg
Item1/Item2/Item3/Item5/image_1.jpg
Item1/Item2/Item3/Item5/image_2.jpg
Is there anyway to achieve this in golang?
Folders do not actually exist in Amazon S3. It is a flat object storage system.
For example, using the AWS Command-Line Interface (CLI) I could copy a command to an Amazon S3 bucket:
aws s3 cp foo.txt s3://my-bucket/folder1/folder2/foo.txt
This work just fine, even though folder1 and folder2 do not exist. This is because objects are stored with a Key (filename) that includes the full path of the object. So, the above object actually has a Key (filename) of:
folder1/folder2/foo.txt
However, to make things easier for humans, the Amazon S3 management console makes it appear as though there are folders. In S3, these are called Common Prefixes rather than folders.
So, when you make an API call to list the contents of the bucket while specifying a Prefix, it simply says "List all objects whose Key starts with this string".
Your listing doesn't show any folders because they don't actually exist.
Now, just to contradict myself, it actually is possible to create a folder (eg by clicking Create folder in the management console). This actually creates a zero-length object with the same name as the folder. The folder will then appear in listings because it is actually listing the zero-length object rather than the folder.
This is probably why Item1/Item2/ appears in your listing, but Item1/Item2/Item3 does not. Somebody, at some stage, must have "created a folder" called Item1/Item2/, which actually created a zero-length object with that Key.
I have to replicate my local folder structure in S3 bucket, I am able to do so but its not creating folders which are empty. My local folder structure is as follows and command used is.
"aws-exec s3 sync ./inbound s3://msit.xxwmm.supplychain.relex.eeeeeeeeee/
its only creating inbound/procurement/pending/test.txt, masterdata and transaction is not cretated but if i put some file in each directory it will create.
As answered by #SabeenMalik in this StackOverflow thread:
S3 doesn't have the concept of directories, the whole folder/file.jpg
is the file name. If using a GUI tool or something you delete the
file.jpg from inside the folder, you will most probably see that the
folder is gone too. The visual representation in terms of directories
is for user convenience.
You do not need to pre-create the directory structure. Just pretend that the structure is there and everything will be okay.
Amazon S3 will automatically create the structure as objects are written to paths. For example, creating an object called s3://bucketname/inbound/procurement/foo` will automatically create the directories.
(This isn't strictly true because Amazon S3 doesn't use directories, but it will appear that the directories are there.)
I have an s3 bucket with "folders" folder1, folder2, folder3, folder4. In folder2 and folder3 there is a "new" folder. I need to delete everything in "new", older than 1 day. Can I do that with a rule like /*/new/ ? Some guys say they have seen such rules work in the past, but that particular definition does nothing.
(In the real bucket there are folder1, folder2 ... folder3001 so I can't make rules for every folder, so please don't suggest that. The above example is for simplicity only.)
The PUT livecycle API takes a "Prefix", which as the name says is a prefix, not a regex.
http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUTlifecycle.html
There is also a limit of 1000 rules per bucket.
http://docs.aws.amazon.com/AmazonS3/latest/dev/object-lifecycle-mgmt.html
You could change your folder structure so that keys look like "new/folderN".