HDFS encryption at rest in Hadoop - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable HDFS encryption zone creation.

Hadoop

hdfs crypto -createZone -keyName [1] -path /encrypted_data

Drag options to blanks, or click blank then click option'

Azone_key

Bdefault

Cencryption_key

Dmy_key

Attempts:

3 left

💡 Hint

Common Mistakes

Using a key name that does not exist in the KMS.

Forgetting to specify the path for the encryption zone.

The default key is typically used to create an encryption zone unless a custom key is specified.

2fill in blank

medium

Complete the command to list all encryption zones in HDFS.

Hadoop

hdfs crypto -listZones | grep [1]

Drag options to blanks, or click blank then click option'

Apath

Bencrypted

Czone

DkeyName

Attempts:

3 left

💡 Hint

Common Mistakes

Using grep with a keyword not present in the output.

Not using the crypto command before listZones.

Listing encryption zones shows their paths, so filtering by 'path' helps identify zones.

3fill in blank

hard

Fix the error in the command to create a new encryption key in KMS.

Hadoop

hadoop key [1] create -size 128 -description "Data encryption key"

Drag options to blanks, or click blank then click option'

Akeyadmin

Bkeytool

Ckey

Dkey create

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'key' instead of 'keyadmin' causes command not found errors.

Incorrect subcommand syntax.

The correct subcommand to manage keys in Hadoop KMS is 'keyadmin'.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps file paths to their encryption status.

Hadoop

encryption_status = {file: [1] for file in files if files[file] [2] True}

Drag options to blanks, or click blank then click option'

Afiles[file]

B==

C!=

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' causes wrong filtering.

Using a literal 'True' instead of accessing dictionary value.

We map each file to its encryption status by accessing files[file] and filter where status equals True.

5fill in blank

hard

Fill both blanks to create a dictionary of keys and their creation dates filtered by date.

Hadoop

filtered_keys = { for {BLANK_2}}, [2] in keys.items() if {{BLANK_3}} > '2023-01-01'

Drag options to blanks, or click blank then click option'

A{

Bkey

Cdate

D}

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the opening or closing braces.

Using wrong variable names in the loop.

We create a dictionary comprehension starting with '{', iterate over keys and dates, and filter dates after 2023-01-01.

Practice

1. What is the main purpose of HDFS encryption at rest?

easy

A. To speed up data processing in Hadoop

B. To protect stored data by encrypting files on disk

C. To compress files for storage efficiency

D. To replicate data across nodes for fault tolerance

Solution

1. Step 1: Understand the concept of encryption at rest

   Encryption at rest means protecting data stored on disk by converting it into a secure format.

2. Step 2: Identify the purpose of HDFS encryption at rest

   HDFS encryption at rest specifically encrypts files on disk to prevent unauthorized access.

3. Final Answer:

   To protect stored data by encrypting files on disk -> Option B

4. Quick Check:

   Encryption at rest = Protect data on disk [OK]

Hint: Encryption at rest means data is safe on disk [OK]

Common Mistakes:

• Confusing encryption with compression
• Thinking encryption speeds up processing
• Mixing encryption with data replication

2. Which of the following is the correct command to create an encryption zone in HDFS?

easy

A. hdfs dfsadmin -createEncryptionZone -keyName mykey -path /zone

B. hdfs dfs -createEncryptionZone -keyName mykey -path /zone

C. hdfs crypto -createZone -keyName mykey -path /zone

D. hdfs crypto -createEncryptionZone -keyName mykey -path /zone

Solution

1. Step 1: Recall the correct syntax for creating encryption zones

   The command to create an encryption zone uses 'hdfs dfsadmin' with the '-createEncryptionZone' option.

2. Step 2: Match the command options

   hdfs dfsadmin -createEncryptionZone -keyName mykey -path /zone correctly uses 'hdfs dfsadmin -createEncryptionZone -keyName mykey -path /zone'. Other options use incorrect commands or flags.

3. Final Answer:

   hdfs dfsadmin -createEncryptionZone -keyName mykey -path /zone -> Option A

4. Quick Check:

   Encryption zone creation uses dfsadmin command [OK]

Hint: Use 'hdfs dfsadmin -createEncryptionZone' to create zones [OK]

Common Mistakes:

• Using 'hdfs dfs' instead of 'hdfs dfsadmin'
• Incorrect flag names like '-createZone'
• Mixing crypto commands with dfsadmin commands

3. Given the following commands executed in order:
hdfs key create mykey
hdfs dfsadmin -createEncryptionZone -keyName mykey -path /secure
What will happen if you try to write a file to /secure?

medium

A. The file will be stored encrypted automatically

B. The file will be stored unencrypted

C. An error will occur because the key does not exist

D. The file will be compressed but not encrypted

Solution

1. Step 1: Understand key creation and encryption zone setup

   The key 'mykey' is created first, then an encryption zone is created at '/secure' using that key.

2. Step 2: Analyze file write behavior in encryption zones

   Files written inside an encryption zone are automatically encrypted using the zone's key.

3. Final Answer:

   The file will be stored encrypted automatically -> Option A

4. Quick Check:

   Encryption zone + key = automatic encryption [OK]

Hint: Files in encryption zones encrypt automatically [OK]

Common Mistakes:

• Assuming files need manual encryption
• Thinking key creation is after zone creation
• Confusing compression with encryption

4. You run the command hdfs dfsadmin -createEncryptionZone -keyName unknownkey -path /data but get an error. What is the most likely cause?

medium

A. The encryption zone path /data does not exist

B. The command syntax is incorrect

C. The key 'unknownkey' has not been created in the Key Management Server

D. Encryption zones cannot be created on /data directory

Solution

1. Step 1: Check prerequisites for creating encryption zones

   An encryption zone requires a valid key that must be created beforehand in the Key Management Server.

2. Step 2: Identify cause of error

   The error likely occurs because 'unknownkey' does not exist, so the zone cannot be created with a missing key.

3. Final Answer:

   The key 'unknownkey' has not been created in the Key Management Server -> Option C

4. Quick Check:

   Missing key causes encryption zone creation error [OK]

Hint: Keys must exist before creating encryption zones [OK]

Common Mistakes:

• Assuming path existence causes error
• Ignoring key creation step
• Thinking command syntax is wrong

5. You want to secure sensitive data in HDFS by creating an encryption zone. Which sequence of steps is correct?

hard

A. Write files, create encryption zone, then create key

B. Write files, create key, then create encryption zone

C. Create encryption zone, then create key, then write files

D. Create key, create encryption zone, then write files

Solution

1. Step 1: Understand the order of operations for encryption setup

   First, a key must be created in the Key Management Server to be used for encryption.

2. Step 2: Create the encryption zone using the created key

   After the key exists, create the encryption zone specifying that key.

3. Step 3: Write files inside the encryption zone to have them encrypted automatically

   Files written after zone creation will be encrypted at rest.

4. Final Answer:

   Create key, create encryption zone, then write files -> Option D

5. Quick Check:

   Key -> Zone -> Files = Correct sequence [OK]

Hint: Create key before zone, then write files inside zone [OK]

Common Mistakes:

• Creating zone before key
• Writing files before zone creation
• Assuming files encrypt without zone