How to Access Amazon S3 Storage from EC2 Instance via Preconfigured IAM Role.
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IAM Roles for EC2 - Overview

IAM Roles for EC2 allow you to access Amazon S3 storage from EC2 without transferring your Access Key ID and Secret Access Key to the instance.

You define the Role in your IAM AWS Console and launch the EC2 instance with this role. Applications running on such instance are now able to obtain temporary Access Keys from instance metadata. These access keys are rotated during the day providing you an additional layer of security.

To connect to Amazon S3 from EC2 via IAM Role:

1. Start S3 Browser and click Accounts -> Add New Account.

click add new account menu item

Click Accounts -> Add New Account

Add New Account dialog will open:

add iam ec2 storage account

Add New Amazon S3 from EC2 via IAM Role Account dialog

2. Enter Account Name - any name of your choice to label the account.

3. Choose Amazon S3 on EC2 via IAM Role as Account Type.

4. Click Add new account.

You can now choose the newly added account from the accounts menu:

how to switch between amazon s3 accounts

Click Accounts -> Account Name to switch between accounts.

Advanced Account Settings

You may also configure additional settings when adding new or editing existing account.

In order to open advanced account settings, please click the advanced settings link located at the bottom left corner of the dialog.

The Advanced Account Settings dialog will open:

Advanced storage settings dialog

Advanced account settings

You may configure the following settings here:

List all my buckets when account assigned - if checked, S3 Browser performs s3:ListAllMyBuckets call when account is assigned. You may uncheck this for accounts that are not allowed to list all buckets to avoid failed tasks and warnings in the log.

Check CloudFront distributions when account assigned - if checked, S3 Browser performs cloudfront:ListDistributions call when account is assigned to set special icon for buckets that are used as origin for CloudFront distributions. You may uncheck this for accounts that are not allowed to list CloudFront distributions to avoid failed tasks and warnings in the log.

External Buckets - you may edit external buckets associated with the account. Each bucket must be specified on a new line. Optional path is also supported, slash is used as delimiter, for example my-bucket/and/optional/path

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