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Getting started with the Swift S3 API

Getting started with the Swift S3 API

Objective

The Swift s3api middleware providing S3 API compatibility has been enabled on all Public Cloud regions. This guide will help you access objects in Swift using a software designed to interact with S3-compatible endpoints.

Requirements

Instructions

Set the OpenStack environment variables

user@host:~$ source <user_name>-openrc.sh
Please enter your OpenStack Password for project <project_name> as user <user_name>:

user@host:~$

Install Openstack client if needed

user@host:~$ pip install python-openstackclient

user@host:~$

Openstack client command reference here.

Create EC2 credentials

S3 tokens are different, you need 2 parameters (access and secret) to generate a S3 token. These credentials will be safely stored in Keystone. To generate it:

With python-openstack client:

user@host:~$ openstack ec2 credentials create
+------------+----------------------------------------------------------------------------------------------------------------------------+
| Field      | Value                                                                                                                      |
+------------+----------------------------------------------------------------------------------------------------------------------------+
| access     | 5a4d8b8d88104123a862c527ede5a3d3                                                                                           |
| links      | {u'self': u'https://auth.cloud.ovh.net/v3/users/d74d05ff121b44bea9216495e7f0df61/credentials/OS-                     |
|            | EC2/5a4d8b8d88104123a862c527ede5a3d3'}                                                                                     |
| project_id | 20e124b71be141299e111ec26b1892fa                                                                                           |
| secret     | 925d5fcfcd9f436d8ffcb20548cc53a2                                                                                           |
| trust_id   | None                                                                                                                       |
| user_id    | d74d05ff121b44bea9216495e7f0df61                                                                                           |
+------------+----------------------------------------------------------------------------------------------------------------------------+

With curl:

user@host:~$ curl -s -D headers -H "Content-Type: application/json" -d '
{ "auth": {
    "identity": {
      "methods": ["password"],
      "password": {
        "user": {
          "name": "'$OS_USERNAME'",
          "domain": { "name": "'$OS_USER_DOMAIN_NAME'" },
          "password": "'$OS_PASSWORD'"
        }
      }
    },
    "scope": {
      "project": {
        "name": "'$OS_PROJECT_NAME'",
        "domain": { "name": "'$OS_PROJECT_DOMAIN_NAME'" }
      }
    }
  }
}' "${OS_AUTH_URL}/auth/tokens" > token_info
user@host:~$ OS_TOKEN=$(egrep "^X-Subject-Token:" headers | awk '{print $2}')
user@host:~$ OS_USER_ID=$(cat token_info  | jq -r '.["token"]["user"]["id"]')
user@host:~$ OS_PROJECT_ID=$(cat token_info  | jq -r '.["token"]["project"]["id"]')
user@host:~$ curl -s -X POST -H "Content-Type: application/json" -H "X-Auth-Token: $OS_TOKEN" -d '{"tenant_id": "$OS_PROJECT_ID"}' "${OS_AUTH_URL}/users/${OS_USER_ID}/credentials/OS-EC2" | jq .
{
  "credential": {
    "user_id": "d74d05ff121b44bea9216495e7f0df61",
    "links": {
      "self": "https://auth.cloud.ovh.net/v3/users/d74d05ff121b44bea9216495e7f0df61/credentials/OS-EC2/660c89cfc4764271ba169941c7b2f310"
    },
    "tenant_id": "20e124b71be141299e111ec26b1892fa",
    "access": "660c89cfc4764271ba169941c7b2f310",
    "secret": "fc9e8eb545724accadcfabbd99207df1",
    "trust_id": null
  }
}

Configure aws client

Install the aws client and configure it as follows:

user@host:~$ pip install awscli awscli-plugin-endpoint
[...]
user@host:~$ cat .aws/config
[plugins]
endpoint = awscli_plugin_endpoint

[profile default]
aws_access_key_id = <access fetched in previous step>
aws_secret_access_key = <secret fetched in previous step>
region = <public cloud region in lower case>
s3 =
  endpoint_url = https://s3.<public cloud region>.cloud.ovh.net
  signature_version = s3v4
  addressing_style = virtual
s3api =
  endpoint_url = https://s3.<public cloud region>.cloud.ovh.net

Virtual hosted-style and path-style access are supported in all regions, but we recommend to use virtual hosted-style since path-style access will be deprecated after September 30, 2020.

Use aws client

List buckets (containers):

user@host:~$ aws --profile default s3 ls

Create a new bucket:

user@host:~$ aws --profile default s3 mb s3://bucket

S3 no longer supports creating bucket names that contain uppercase letters or underscores. S3 Buckets can only be created on PCS policy (Object Storage)

Upload a local file to Swift:

user@host:~$ aws --profile default s3 cp file.txt s3://bucket/file.txt

Download an object from Swift:

user@host:~$ aws --profile default s3 cp s3://bucket/file.txt file.txt

Delete a Swift object:

user@host:~$ aws --profile default s3 rm s3://bucket/file.txt

Delete a bucket:

user@host:~$ aws --profile default s3 rb s3://bucket

Go further

  • Openstack client command reference here
  • S3 client command reference here

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