![]() Enter a name for ‘Filter Name’, say vpcFlowLogsFilter. Then specify vpcFlowLogs as the log group. Select ‘CloudWatch Logs’ as trigger if it’s not already selected. At that point you can select splunk-cloudwatch-logs-processor Lambda blueprint.ģb. Alternatively, you can navigate to AWS Lambda console, click ‘Create a Lambda function’, then search for ‘splunk’ under ‘Select blueprint’. Create Lambda function using the “CloudWatch Logs to Splunk” Lambda blueprint from AWS console by clicking here. Luckily, there’s already a Lambda blueprint published by Splunk for exactly that purpose.ģa. It will be execute by CloudWatch Logs whenever there are logs in a group, and stream these records to Splunk. The pipeline stage prior to Splunk HEC is AWS Lambda. ![]() Here’s how the data input settings would look like: Note: For Splunk Cloud deployments, HEC must be enabled by Splunk Support. Make sure to take note of your new HEC token value. This is important to enable automatic fields extractions. When configuring the input settings, make sure to specify “aws:cloudwatchlogs:vpcflow” as sourcetype. Refer to Splunk HEC docs for detailed instructions. Create an HEC token from Splunk Enterprise. sourcetypes) that already exist in the Add-on to automatically parse the VPC Flow logs records and extract the fields.Ģb. However, we will leverage the data parsing logic (i.e. Note that since we’ll be using Splunk HEC, we will *not* be relying on any modular input from the Add-on to collect from CloudWatch Logs or VPC Flow Logs. Now that you have flow logs being recorded, we’ll start setting up the data pipeline from the end, that is Splunk, working our way backward.Ģa. Within a few minutes, you should start seeing flow logs records in CloudWatch Logs console under that log group. For the rest of this guide, let’s say you specified vpcFlowLogs as the destination CloudWatch Logs group, which we’ll reference in a subsequent step. Enable Flow Logs on your VPCs() from the AWS VPC Console as described in AWS VPC docs. Click on ‘Edit Trust Relationship’ under ‘Trust Relationships’ tab of the newly created role, delete any existing policy then paste the following:ġb. You’ll also need to set a trust relationship on this role to allow the flow logs service to assume this role. Take note of the role name, say vpcFlowLogsRole, as you’ll need it in subsequent step. Go ahead and create a new IAM role with the following IAM policy attached: Create a Flow Logs role to give permissions to VPC Flow Logs service to publish logs into CloudWatch Logs. If you already have a CloudWatch log stream from VPC Flow logs or other sources, you can skip to step 2, replacing VPC Flow logs references with your specific data type.ġa. The following guide uses VPC Flow logs as an example CloudWatch log stream. Step-by-step walkthrough to stream AWS CloudWatch Logs Since there are no dedicated pollers to manage and orchestrate, the ‘push’ model generally offers the following benefits: This post pertains to the push model which is particularly applicable for microservice architectures and event-driven computing such as AWS Lambda. These two pull and push models apply to different use cases and have different considerations. One example of pushing data is via AWS Lambda function which is used to stream events over HTTPS to Splunk HTTP Event Collector (HEC). One example of pulling data from remote sources is the widely popular Splunk Add-on for AWS which reliably collects data from various AWS services. Splunk supports numerous ways to get data in, from monitoring local files or streaming wire data, to pulling data from remote 3rd-party APIs, to receiving data over syslog, tcp/udp, or http. Step-by-step walkthrough to stream AWS CloudWatch Logsįirst, a note on pull vs push ingestion methods.First, a note on pull vs push ingestion methods.With that said, the following mechanism applies to any logs stored in CloudWatch Logs. VPC Flow logs capture information about all the IP traffic going to and from network interfaces, and is therefore instrumental for security analysis and troubleshooting. In the following example, we are interested in streaming VPC Flow logs which are stored in CloudWatch Logs. In this blog post, we’ll walk you through step-by-step how to use one of these AWS Lambda blueprints, the Lambda blueprint for CloudWatch Logs, to stream AWS CloudWatch Logs via AWS Lambda and into Splunk for near real-time analysis and visualization as depicted in the diagram below. At AWS re:Invent 2016, Splunk released several AWS Lambda blueprints to help you stream logs, events and alerts from more than 15 AWS services into Splunk to gain enhanced critical security and operational insights into your AWS infrastructure & applications.
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