CUSTOMER TIPS
S3 Introductory Examples
This “cheat sheet” works as a good entry point for getting to know S3 for folks that are new to it.
To start, we’re going to make the assumption that you have a set of account-level keys generated per the Scality documentation for creating an S3 account.
Configuring the CLI
All cheating in this document is to be done with the AWS CLI utility (aws). No other tools like s3cmd or GUIs like Cyberduck are covered here. This is because the AWS CLI is the only really good client out there. The “free” GUI clients are generally poor-quality and why not use the defacto Amazon tool?
Get the client from the Amazon CLI page or install the “awscli” package if you’re on a Linux distribution..
Configure the aws cli with your account keys:
Use whatever name you like for “s3c-account”. Pro tip: set “us-east-1” as your default region when prompted to avoid client weirdness later.
Create an alias for accessing Scality S3
Create an alias to simplify accessing your S3 install as the “aws” tool defaults to Amazon’s cloud services. If your endpoint is clear HTTP this will do the trick:
If your load-balancer or endpoint is HTTPS and you used your own CA to sign you’ll need to set the AWS_CA_BUNDLE variable or provide it in the alias:
Basic S3 Actions
AWS CLI reference for basic actions can be found in the Amazon CLI Reference.
Cheat-Sheet Examples
create a bucket:
Using IAM (Scality Vault
Vault is the Scality IAM implementation with a feature-set built around S3. See the full IAM documentation for a good time.
Basic User/Group Management
Creating groups:
s3caws iam create-group --group-name=hecklers
Create some users:
s3caws iam create-user --user-name zoot
s3caws iam create-user --user-name janis
s3caws iam create-user --user-name animal
s3caws iam create-user --user-name statler
s3caws iam create-user --user-name waldorf
Add users to groups:
s3caws iam add-user-to-group --group-name electricmayehm --user-name zoot
s3caws iam add-user-to-group --group-name electricmayehm --user-name janis
s3caws iam add-user-to-group --group-name electricmayehm --user-name animal
s3caws iam add-user-to-group --group-name hecklers --user-name statler
s3caws iam add-user-to-group --group-name hecklers --user-name waldorf
Generate a key pair for a user:
{
"AccessKey": {
"UserName": "statler",
"Status": "Active",
"SecretAccessKey": "QfSP8onXI0vo=gtsLHoH6+EH72pMN34BFjxnnDfY",
"AccessKeyId": "97Y1VRM0Y31CNUK5YZSA"
} }
Show group members:
s3caws iam get-group --group-name electricmayehm
IAM Policy Creation
IAM policies are rules applied to IAM entities (users/groups) that can be used to control access to resources. In the case of Scality, those resources will be S3-related (or IAM itself). Users and groups are (almost) meaningless if there are no policies attached to them. Policy creation is a complex topic – it is important to understand that these examples aren’t really useful, just examples. The IAM documentation should be referenced for understanding IAM but once you know what you’re doing you can use the AWS policy generator to create valid JSON for use with S3C.
(select “IAM Policy” in the drop-down, then “Amazon S3” for the service)
IAM Policy Examples
Scality implements a lot of IAM actions. See the Vault API Reference for a full list of supported actions.
Create a couple of simple policies:
cat << EOF > ~/policies/all-access.policy
{
"Version": "2012-10-17",
"Statement": [
{
"Sid":"AllowAll",
"Effect":"Allow",
"Action":"s3:*",
"Resource": "*"
}
]
}
EOF
cat << EOF > ~/policies/all-deny.policy
{
"Version": "2012-10-17",
"Statement": [
{
"Sid":"DenyAll",
"Effect":"Deny",
"Action":"s3:*",
"Resource": "*"
}
]
}
EOF
Load the policy description documents:
--policy-document file:///root/policies/all-access.policy
awsiam iam create-policy --policy-name no-access \
--policy-document file:///root/policies/all-deny.policy
Attach a policy to a user (replacing policy ARN with the ARN output when doing the “create-policy” above:
--policy-arn "arn:aws:iam::017061715665:policy/all-access"
Here’s an example “home directory” type policy:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "AllowGroupToSeeBucketList",
"Action": ["s3:ListAllMyBuckets", "s3:GetBucketLocation"],
"Effect": "Allow",
"Resource": ["arn:aws:s3:::*"]
},
{
"Sid": "AllowRootLevelListingOfThisBucketAndHomePrefix",
"Action": ["s3:ListBucket"],
"Effect": "Allow",
"Resource": ["arn:aws:s3:::mybucket"],
"Condition": {"StringEquals":{"s3:prefix": ["","home/"],"s3:delimiter":["/"]}}
},
{
"Sid": "AllowListBucketofASepecificUserPrefix",
"Action": ["s3:ListBucket"],
"Effect": "Allow",
"Resource": ["arn:aws:s3:::mybucket"],
"Condition": {"StringLike": {"s3:prefix":["home/${aws:username}/*"]}}
},
{
"Sid": "AllowUserFullAcccesstoJustSpecificUserPrefix",
"Action": ["s3:*"],
"Effect": "Allow", "Resource": ["arn:aws:s3:::mybucket/home/${aws:username}",
"arn:aws:s3:::mybucket/home/${aws:username}/*"]
}
]
}
EOF
Create the actual policy:
Note the returned Policy-ARN and attach the homedir policy to a group:
Attach users to the group:
s3caws iam add-user-to-group --group-name hecklers --user-name waldorf
Bucket ACLS
Simple, corse-grained (read, write, read/write) access permissions for buckets. Complete documentation on managing bucket ACLs via the AWS CLI can be found in the AWS CLI ACL reference:
Get current bucket ACLs:
{
"Owner": {
"DisplayName": "johndoe",
"ID": "d35f......."
},
"Grants": [
{
"Grantee": {
"Type": "CanonicalUser",
"DisplayName": "johndoe",
"ID": "d35f........."
},
"Permission": "FULL_CONTROL"
}
]
}
Set a bucket ACL:
Bucket Polices
Bucket policies are available in S3C. See the AWS bucket policy examples to get a good feel for what you can do with them. You can also use the AWS policy generator to create valid JSON for bucket policies.
(select “S3 Bucket Policy” in the drop-down)
Create a bucket policy document. This one will restrict access to a bucket by IP address:
{
"Version": "2012-10-17",
"Id": "SourceIP",
"Statement": [{
"Sid": "SourceIP",
"Effect": "Deny",
"Principal": "*",
"Action": "s3:*",
"Resource": [
"arn:aws:s3:::examplebucket",
"arn:aws:s3:::examplebucket/*"
],
"Condition": {
"NotIpAddress": {
"aws:SourceIp": [
"11.11.11.11/32",
"22.22.22.22/32"
]
}
}
}]
}
EOF
You can apply the policy to the bucket with AWS CLI using the alias created above:
Object Tagging
You can tag objects on creation or after the fact. Here’s an object getting tagged during creation:
s3caws s3api get-object-tagging --bucket mybucket --key myobject
{
"TagSet": [
{
"Value": "blue",
"Key": "color"
}
]
}
You can also tag things after upload:
s3caws s3api get-object-tagging --bucket mybucket --key myobject
{
"TagSet": [
{
"Value": "you are wrong",
"Key": "thoughts"
}
]
}
That’s all for now. Feel free to open a ticket to suggest updates.
If this does not solve your issues please get in touch with support
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