Configuring credentials in AWS - Visual Walkthrough

Process Flow - Configuring credentials

Start

↓

Create Credentials File

↓

Add Access Key & Secret

↓

Save File in ~/.aws/credentials

↓

Use AWS CLI or SDK

↓

Credentials Loaded

↓

Access AWS Services

↓

End

This flow shows how AWS credentials are created, saved, and then used by AWS tools to access services.

Execution Sample

AWS

[default]
aws_access_key_id = AKIAEXAMPLE
aws_secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY

This is the content of the AWS credentials file with access key and secret key under the default profile.

Process Table

Step	Action	File/Location	Content Added/Used	Result
1	Create credentials file	~/.aws/credentials	File created	Ready to add keys
2	Add access key ID	~/.aws/credentials	aws_access_key_id = AKIAEXAMPLE	Key ID stored
3	Add secret access key	~/.aws/credentials	aws_secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY	Secret stored
4	Save file	~/.aws/credentials	File saved with keys	Credentials ready
5	Run AWS CLI command	Uses ~/.aws/credentials	Reads keys	Credentials loaded successfully
6	Access AWS service	AWS SDK/CLI	Uses loaded credentials	Service accessed
7	End	-	-	Process complete

💡 Credentials file saved and used successfully to access AWS services

Status Tracker

Variable	Start	After Step 2	After Step 3	Final
aws_access_key_id	None	AKIAEXAMPLE	AKIAEXAMPLE	AKIAEXAMPLE
aws_secret_access_key	None	None	wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY	wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
credentials_file	Not created	Created empty	Filled with keys	Saved with keys

Key Moments - 3 Insights

Why do we need to save the credentials file in ~/.aws/credentials?

AWS CLI and SDK look for credentials in this default location to authenticate requests, as shown in steps 4 and 5 of the execution_table.

What happens if the access key or secret key is missing or incorrect?

AWS CLI or SDK will fail to authenticate and cannot access services, because the credentials loaded in step 5 will be invalid.

Can we have multiple profiles in the credentials file?

Yes, by adding sections like [profile_name], but this example uses only the default profile as shown in the execution_sample.

Visual Quiz - 3 Questions

Look at the execution_table, at which step is the secret access key added?

A Step 3

B Step 4

C Step 2

D Step 5

💡 Hint

Check the 'Content Added/Used' column for the secret key in the execution_table rows.

According to variable_tracker, what is the value of aws_access_key_id after step 3?

A wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY

B None

C AKIAEXAMPLE

D Not created

💡 Hint

Look at the 'After Step 3' column for aws_access_key_id in variable_tracker.

If the credentials file is not saved properly, what will happen at step 5?

A Credentials will load successfully

B AWS CLI will fail to find credentials

C Access key will be auto-generated

D AWS service will be accessed without authentication

💡 Hint

Refer to the 'Result' column at step 5 in execution_table about credentials loading.

Concept Snapshot

AWS credentials are stored in ~/.aws/credentials file.
The file contains access key ID and secret access key under a profile.
AWS CLI and SDK read this file to authenticate requests.
Always save the file securely and never share your keys.
Multiple profiles can be added for different accounts.

Full Transcript

To configure AWS credentials, you create a file named 'credentials' in the '.aws' folder in your home directory. This file holds your access key ID and secret access key under a profile name, usually 'default'. When you run AWS CLI commands or use AWS SDKs, they read this file to authenticate your requests. The process starts by creating the file, adding your keys, saving it, and then using AWS tools that load these credentials to access AWS services. If the credentials are missing or incorrect, authentication fails. You can also manage multiple profiles by adding sections with different names in the credentials file.

Practice

1. What is the main purpose of AWS credentials?

easy

A. To prove your identity and allow access to AWS services

B. To store your AWS billing information

C. To configure your AWS service regions

D. To monitor AWS service usage

Solution

1. Step 1: Understand what credentials do

   AWS credentials are like a key that proves who you are when you use AWS services.

2. Step 2: Identify the correct purpose

   They allow AWS to know you and give you permission to use services securely.

3. Final Answer:

   To prove your identity and allow access to AWS services -> Option A

4. Quick Check:

   Credentials = Identity proof [OK]

Hint: Credentials prove identity to AWS services [OK]

Common Mistakes:

• Confusing credentials with billing info
• Thinking credentials set regions
• Assuming credentials monitor usage

2. Which file stores AWS access keys for different profiles by default?

easy

A. ~/.aws/config

B. ~/.aws/credentials

C. /etc/aws/keys

D. ~/.aws/access

Solution

1. Step 1: Recall default AWS credential file

   AWS stores access keys in the file named 'credentials' inside the '.aws' folder in your home directory.

2. Step 2: Differentiate from config file

   The 'config' file stores settings like region and output format, not keys.

3. Final Answer:

   ~/.aws/credentials -> Option B

4. Quick Check:

   Access keys = ~/.aws/credentials [OK]

Hint: Access keys live in ~/.aws/credentials file [OK]

Common Mistakes:

• Mixing up config and credentials files
• Using wrong file paths
• Assuming keys are in system folders

3. Given this AWS credentials file snippet:

[default]
aws_access_key_id=AKIA123456
aws_secret_access_key=secret123

[dev]
aws_access_key_id=AKIADEV123
aws_secret_access_key=devsecret456

What happens if you run AWS CLI without specifying a profile?

medium

A. It asks you to enter credentials manually

B. It uses the 'dev' profile credentials

C. It throws an error for missing profile

D. It uses the 'default' profile credentials

Solution

1. Step 1: Identify default profile usage

   When no profile is specified, AWS CLI uses the 'default' profile credentials automatically.

2. Step 2: Check the given profiles

   The file has a 'default' and a 'dev' profile; without specifying, 'default' is chosen.

3. Final Answer:

   It uses the 'default' profile credentials -> Option D

4. Quick Check:

   No profile specified = default used [OK]

Hint: No profile given? AWS CLI uses 'default' [OK]

Common Mistakes:

• Assuming 'dev' is default
• Expecting error without profile
• Thinking manual input is required

4. You try to run AWS CLI commands but get an error: Unable to locate credentials. What is the most likely cause?

medium

A. The AWS region is not set in config

B. The AWS CLI version is outdated

C. The ~/.aws/credentials file is missing or empty

D. Your internet connection is down

Solution

1. Step 1: Understand the error meaning

   'Unable to locate credentials' means AWS CLI cannot find your access keys anywhere.

2. Step 2: Identify common causes

   This usually happens if the credentials file is missing, empty, or incorrectly placed.

3. Final Answer:

   The ~/.aws/credentials file is missing or empty -> Option C

4. Quick Check:

   Missing credentials file = error [OK]

Hint: Check if ~/.aws/credentials file exists and has keys [OK]

Common Mistakes:

• Blaming CLI version for missing credentials
• Confusing region setting with credentials
• Assuming internet issues cause credential errors

5. You want to securely allow an EC2 instance to access S3 without storing access keys on the instance. Which method should you use?

hard

A. Use IAM roles attached to the EC2 instance

B. Hardcode access keys in your application code

C. Store access keys in ~/.aws/credentials on the instance

D. Use environment variables with access keys on the instance

Solution

1. Step 1: Identify secure credential methods

   Storing keys on the instance or in code risks exposure and is not best practice.

2. Step 2: Use IAM roles for EC2

   IAM roles provide temporary credentials automatically and securely to the instance without manual keys.

3. Final Answer:

   Use IAM roles attached to the EC2 instance -> Option A

4. Quick Check:

   EC2 access without keys = IAM roles [OK]

Hint: Use IAM roles for EC2 to avoid storing keys [OK]

Common Mistakes:

• Storing keys on instance files
• Hardcoding keys in code
• Using environment variables insecurely