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In many cloud environments, teams need private connectivity without relying on public internet access for API calls. AWS has expanded support for PrivateLink, including services like Step Functions, enabling secure, private API integrations.
You Should Know:
1. AWS PrivateLink Setup for Step Functions
AWS PrivateLink allows private connectivity between VPCs and AWS services without exposing traffic to the internet. Here’s how to configure it:
Step 1: Create a VPC Endpoint for Step Functions
aws ec2 create-vpc-endpoint \ --vpc-id vpc-12345678 \ --service-name com.amazonaws.us-east-1.states \ --vpc-endpoint-type Interface \ --subnet-id subnet-12345678 \ --security-group-id sg-12345678
**Step 2: Configure IAM Policies for Private Access**
Ensure your IAM policies allow Step Functions to interact with other AWS services privately.
#### **2. EventBridge Integration with PrivateLink**
To securely trigger Step Functions via EventBridge without internet exposure:
Step 1: Create an EventBridge Rule with a Private Connection
aws events put-rule \
--name "TriggerStepFunction" \
--event-pattern '{"source": ["aws.ec2"], "detail-type": ["EC2 Instance State-change Notification"]}'
Step 2: Set the Step Function as a Target with VPC Endpoint
aws events put-targets \ --rule TriggerStepFunction \ --targets "Id"="1","Arn"="arn:aws:states:us-east-1:123456789012:stateMachine:MyStateMachine"
#### **3. Verify Private Connectivity**
Use `curl` or `telnet` to test internal API access:
telnet states.us-east-1.amazonaws.com 443
#### **4. Monitoring & Troubleshooting**
Check VPC Flow Logs and CloudWatch for errors:
aws logs filter-log-events \ --log-group-name /aws/vpc/flow-logs \ --filter-pattern "REJECT"
### **What Undercode Say**
Private API integrations via AWS PrivateLink enhance security by eliminating internet exposure. Key takeaways:
– Use VPC endpoints for internal AWS service access.
– Restrict IAM policies to least privilege.
– Monitor traffic with VPC Flow Logs and CloudWatch.
– Test connectivity with telnet or curl before full deployment.
For further reading:
### **Expected Output:**
A secure, private AWS architecture where Step Functions and EventBridge communicate without internet reliance.
References:
Reported By: Darryl Ruggles – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
