Object Storage

Overview

SysEleven Stack provides S3 compatible Object Storage.

It stores and retrieves arbitrary unstructured data objects via a RESTful, HTTP-based API. It is highly fault tolerant with its data replication and scale-out architecture. In its implementation as a distributed eventually consistent object storage, it is not mountable like a file server.

You can create the OpenStack API to generate credentials to access the SysEleven Stack Object Storage. You can then use the S3 API with various S3 clients and/or SDKs.

Supported S3 operations

Setting bucket/object ACLs is only partially possible and currently unintuitive to use. We are in contact with the software manufacturer to solve this problem. For detailed information feel free to contact our Cloud Support.

Buckets

Buckets are the logical unit SysEleven Stack Object Storage uses to stores objects.
Every bucket name is unique within a SysEleven Stack region.

Objects

Basically, SysEleven Stack Object Storage is a big key/value store.
A file or file object can be assigned a file name like key, and made available under this key.

Regions

The SEOS (SysEleven-Object-Storage / S3) is available in every region. The storage systems run independent from each other.

Credentials

You need to meet the following prerequisites to generate credentials:

• You need the OpenStack command line tools in version >= 2.0.
• A change to your shell environment (you can add this to your openrc file):

export OS_INTERFACE="public"

When these prerequisites are met, you can generate and display S3 credentials:

openstack ec2 credentials create
openstack ec2 credentials list

Clients

S3cmd

Information about the s3cmd client can be found here.

Now you can create an s3cmd configuration which could look like this:

syseleven@kickstart:~$ cat .s3cfg
[default]
access_key = < REPLACE ME >
secret_key = < REPLACE ME >
use_https = True
check_ssl_certificate = True
check_ssl_hostname = False

host_base = s3.dbl.cloud.syseleven.net
host_bucket = %(bucket).s3.dbl.cloud.syseleven.net

Next, create an S3 Bucket.

s3cmd mb s3://BUCKET_NAME -P

The option -P or --acl-public makes this a public bucket which means that public objects in this bucket and a list of public objects can be retrieved. Without this option or with --acl-private the public retrieval of objects and the list is not possible.

Then add some object(s):

s3cmd put test.jpg s3://BUCKET_NAME -P

Here we upload a file and make it public by specifying the option -P or --acl-public. Objects without this option or with --acl-private are not publicly available and will not be contained in the listing.

Please note that s3cmd may be configured to return incorrect URLs, i.e. by default:

Public URL of the object is: http://BUCKET_NAME.s3.amazonaws.com/test.jpg

The correct URL for this object in SysEleven Stack would be:

https://s3.REGION.cloud.syseleven.net/BUCKET_NAME/test.jpg

where REGION is the SysEleven Stack region (e.g. cbk or dbl).

You can use these URLs to refer to the uploaded files as static assets in your web applications.

Minio

Information about the Minio client can be found here.

Installation of Minio client into the home directory of the current user is necessary for the following example commands to work!

Now you can create a Minio S3 configuration:

~/mc config host add <ALIAS> <YOUR-S3-ENDPOINT> <YOUR-ACCESS-KEY> <YOUR-SECRET-KEY> --api <API-SIGNATURE> --lookup <BUCKET-LOOKUP-TYPE>
~/mc config host add dbl https://s3.dbl.cloud.syseleven.net accesskey secretkey --api S3v4 --lookup dns
~/mc config host add cbk https://s3.cbk.cloud.syseleven.net accesskey secretkey --api S3v4 --lookup dns

Next, create an S3 Bucket:

~/mc mb dbl/bucketname
Bucket created successfully ‘dbl/bucketname’.

Then, use it to add some file(s):

~/mc cp /root/test.jpg dbl/bucketname/test.jpg
/root/test.jpg: 380.21 KB / 380.21 KB ┃▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓┃ 100.00% 65.42 MB/s 0s

List the file(s):

~/mc ls dbl/bucketname
[2018-04-27 14:18:28 UTC] 380KiB test.jpg