[AWS] Lab

Prerequisites:

An AWS account
AWS CLI installed on your client. If not, refer to the official AWS instructions to install/update AWS CLI (version 2) based on your underlying OS.
[Optional] AWS root user's access keys configured in your CLI tool

Topics Covered:

Using the AWS console, create a new IAM user with Programmatic administrator access. We will delete this user programmatically at the end of the exercise.
Using the CLI tool, create a bucket, upload a file to it, and then delete the bucket
Using the CLI tool, delete an IAM user

Step 1. Create a new IAM user

Let's create a new IAM user who would be allowed to interact with services in your AWS account as an administrator. The AWS allows us to choose if the new user should be granted a Programmatic access, or AWS web console access. The permissions to a user are granted in form of Policies, which are JSON documents. The AWS web console provides a pre-created list of policies to choose from.

Navigate to the IAM console, and access the IAM Users service. Start the Add user wizard, as shown below.

Launch the Add user wizard

Set the user details, such as the name, and access type as Programmatic access only.

Set the user name, and type (mode) of access

Set the permissions to the new user by attaching the AWS Managed AdministratorAccess policy from the list of existing policies.

Attach the AdministratorAccess policy from the list of pre-created policies

Provide tags [optional], review the details of the new user, and finally create the new user.

Download the Access key file (.csv) that contains two items: an access key ID, and a secret. Don’t skip this step as this will be your only opportunity to download the Access key file.

After a user is created successfully, download the access key file (.csv) containing the access key ID and a secret

Step 2. Configure a new profile in the AWS CLI

Now, to allow the newly created user to interact with the AWS services via CLI, configure the access key in your CLI tool. Let's create a new profile UdacityLab, and associate the newly created access key to it. You can use the following commands:
```
# Navigate back to your home folder 
cd
# Set the UdacityLab profile credentials in the "credentials"  and "config" file
aws configure --profile UdacityLab
```
It will prompt you to enter the following four values:
- AWS Access Key ID - Paste the value from the downloaded access key file
- AWS Secret Access Key - Paste the value from the downloaded access key file
- Default region name - Enter your preferred region name, such as us-east-2
- Default output format - It can accept either a json, yaml, text, or a table. Enter json for this exercise.

You can review the current configuration as:

# Check the configuration
aws configure list
#View the content of the credentials and configuration file
cat ~/.aws/credentials
cat ~/.aws/config

If you haven't configured any profile ever, you can set the environment variables as well.

# Let the system know that your sensitive information is residing in the .aws folder
export AWS_CONFIG_FILE=~/.aws/config
export AWS_SHARED_CREDENTIALS_FILE=~/.aws/credentials

Note - You can create multiple profiles, and use a specific one in any aws command using the --profile <profile-name> option.

Step 3. Interact with S3 service

Create a public bucket with name my-033212455158-bucket in the us-east-1 region, using the newly created UdacityLab profile.
```
aws s3api  create-bucket --bucket my-033212455158-bucket --acl public-read-write --region us-east-1 --profile UdacityLab
```
In the command above,
- --bucket option specifies the bucket name of your choice. It must be unique across all AWS accounts.
- --profile option specifies the profile whose credentials will be verified for authorization before accessing the S3 service. This option is OPTIONAL. If skipped, the aws CLI will use the default profile stored in your system.
- --acl option specifies the accessibility level
- --region specifies the AWS region where you want to create this bucket
Reference - aws s3api create-bucket command

Upload a file to your bucket. The command below uploads a file names Sample.html, however, you can choose any file from your local system.
```
aws s3api put-object --bucket my-033212455158-bucket --key Sample.html --body Sample.html --profile UdacityLab
```
In the command above,
- --key option specifies the name you want to assign to your object in the bucket
- --body option specifies the file name (complete path) to upload from your local system
Reference aws s3api put-object

Verify the S3 bucket by going to the AWS web console.

A public bucket created using the CLI

Delete the bucket and its content. A bucket can only be deleted if it is empty. Therefore, first delete the Sample.html, and then delete the bucket, as follows:
```
aws s3api delete-object --bucket my-033212455158-bucket --key Sample.html
aws s3api delete-bucket --bucket my-033212455158-bucket --profile UdacityLab
```
Reference - aws s3api commands

Navigate back to the S3 dashboard (AWS web console), and verify if the bucket has been deleted successfully.

Step 4. [Optional] Delete the newly created `UdacityLab` IAM user

Remember, you created the UdacityLab IAM user using the AWS web console. However, you can delete the newly created UdacityLab IAM user from your CLI tool as well.

Note - We are assuming that your AWS root user access key is set in the default profile using the command aws configure --profile default. Use the cat ~/.aws/credentials command to list all the credentials set locally.

View the list of all users (other than the root user) in your AWS account.
```
aws iam list-users
```

A user can only be deleted only after deleting the attached user policies, and access key. The commands below are executed using the default profile, therefore we have not used the --profile option.

# List the policies attached to the UdacityLab user
aws iam list-attached-user-policies --user-name UdacityLab
# A policy can be detached using its ARN, a unique identifier
aws iam detach-user-policy --user-name UdacityLab --policy-arn arn:aws:iam::aws:policy/AdministratorAccess
# List the access key for UdacityLab user
aws iam list-access-keys --user-name UdacityLab
# An access key can be deleted using its access key id
aws iam delete-access-key  --user-name UdacityLab --access-key-id AKIAQGW4TBMDIZQP564S
# Delete the user
aws iam delete-user --user-name UdacityLab

Reference - aws iam commands

Navigate back to the IAM console, and access the IAM Users service to verify if the user has been successfully deleted.