At AWS re:Invent 2016, Splunk appear several AWS Lambda blueprints to advice you beck logs, contest and alerts from added than 15 AWS casework into Splunk to accretion added analytical aegis and operational insights into your AWS basement & applications. In this blog post, we’ll airing you through the step-by-step action of how to use one of these AWS Lambda blueprints, the Lambda adapt for CloudWatch Logs, to beck AWS CloudWatch Logs via AWS Lambda and into Splunk for a real-time assay and decision as depicted in the diagram below. In the afterward example, we are absorbed in alive VPC Breeze logs which are stored in CloudWatch Logs. VPC Breeze logs abduction advice about all the IP cartage activity to and from arrangement interfaces, and is accordingly active for aegis assay and troubleshooting. With that said, the afterward apparatus applies to any logs stored in CloudWatch Logs.
Here’s the outline of this guide:
First, a agenda on cull vs advance assimilation methods
Splunk supports abundant means to get abstracts in, from ecology bounded files or alive wire data, to affairs abstracts from alien 3rd-party APIs, to accepting abstracts over syslog, tcp/udp, or http.
One archetype of affairs abstracts from alien sources is the broadly accepted Splunk Add-on for AWS which anxiously collects abstracts from assorted AWS services.One archetype of blame abstracts is via AWS Lambda action which is acclimated to beck contest over HTTPS to Splunk HTTP Event Collector (HEC).
These two cull and advance models administer to altered use cases and accept altered considerations. This column pertains to the advance archetypal which is decidedly applicative for microservice architectures and event-driven accretion such as AWS Lambda. Back there are no committed pollers to administer and orrate, the ‘push’ archetypal about offers the afterward benefits:
Step-by-Step walkthrough to beck AWS CloudWatch Logs
The afterward instructions use VPC Breeze Logs as an example. If you would like to beck any added CloudWatch Logs besides VPC Breeze Logs, you can skip to footfall 2, and artlessly rename your assets such as Lambda action abnormally to bout your use case.
1. Configure VPC Breeze logs
Skip to footfall 2 if accept already enabled Breeze Logs on your VPC(s).
1a. Actualize a Breeze Logs role to accord permissions to VPC Breeze Logs account to broadcast logs into CloudWatch Logs. Go avant-garde and actualize a new IAM role with the afterward IAM action attached:
Booty agenda of the role name, say vpcFlowLogsRole, as you’ll charge it in consecutive step.You’ll additionally charge to set a assurance accord on this role to acquiesce the breeze logs account to accept this role. Bang on ‘Edit Assurance Relationship’ beneath ‘Trust Relationships’ tab of the anew created role, annul any absolute action again adhesive the following:
1b. Accredit Breeze Logs on your VPCs() from the AWS VPC Animate as declared in AWS VPC docs. For the blow of this guide, let’s say you defined vpcFlowLogs as the destination CloudWatch Logs group, which we’ll advertence in a consecutive step. Within a few minutes, you should alpha seeing breeze logs annal in CloudWatch Logs animate beneath that log group.
2. Configure Splunk ascribe
Now that you accept breeze logs actuality recorded, we’ll alpha ambience up the abstracts activity from the end, that is Splunk, alive our way backwards.
2a. Install Splunk Add-on for AWS. Agenda that back we’ll be application Splunk HEC, we will *not* be relying on any modular ascribe from the Add-on to aggregate from CloudWatch Logs or VPC Breeze Logs. However, we will advantage the abstracts parsing argumentation (i.e. sourcetypes) that already abide in the Add-on to automatically anatomize the VPC Breeze logs annal and abstract the fields.
2b. Actualize an HEC badge from Splunk Enterprise. Refer to Splunk HEC docs for abundant instructions.When configuring the ascribe settings, accomplish abiding to specify ‘aws:cloudwatchlogs:vpcflow’ as sourcetype. This is important to accredit automated fields extractions. Accomplish abiding to booty agenda of your new HEC badge value.Note: For Splunk Cloud deployments, HEC charge be enabled by Splunk Support.
Here’s how the abstracts ascribe settings would attending like:
3. Configure Lambda action
The activity date above-mentioned to Splunk HEC is AWS Lambda. It will be assassinate by CloudWatch Logs whenever there are logs in a group, and beck these annal to Splunk. Luckily, there’s already a Lambda adapt appear by Splunk for absolutely that purpose.
3a. Actualize Lambda action application the ‘CloudWatch Logs to Splunk’ Lambda adapt from AWS animate by beat here. Alternatively, you can cross to AWS Lambda console, bang ‘Create a Lambda function’, again chase for ‘splunk’ beneath ‘Select blueprint’. At that point you can baddest splunk-cloudwatch-logs-processor Lambda blueprint.
3b. Configure Lambda action trigger. Baddest ‘CloudWatch Logs’ as activate if it’s not already selected. Again specify vpcFlowLogs as the log group. Access a name for ‘Filter Name’, say vpcFlowLogsFilter. You can optionally access a amount for ‘Filter pattern’ if you appetite to bind what gets delivered to Lambda. Afore beat ‘Next’, accomplish abiding ‘Enable trigger’ is checked. This is an archetype of how this anatomy would attending like:
This is additionally accepted as a CloudWatch Logs cable clarify which finer creates a real-time augment of logs contest from the called log group, in this case vpcFlowLogs.
Agenda that, back abacus this Lambda activate from the AWS Console, Lambda will add the appropriate permissions for CloudWatch Logs account to adjure this accurate Lambda function.
3c. Configure Lambda function. The action already accouterments the all-important argumentation to action the CloudWatch Logs data, including adaptation it and decompressing it, and breaking the contest afore sending to Splunk HEC. You’ll charge to set the afterward appropriate parameters:
Agenda that AWS Lambda encrypts the ambiance variables at blow application a Lambda account key, by default. Environments variables are decrypted automatically by AWS Lambda back the action is invoked. While not appropriate for the purpose of this set up, you additionally accept the advantage to encrypt the ambiance variables afore deploying the Lambda function. For added information, see Actualize a Lambda action application Ambiance Variables to Store Sensitive Information.
At this point, you can bang ‘Next’ afterwards reviewing your Lambda agreement which should attending as follows:
Afterwards few minutes, you should alpha seeing contest in Splunk Enterprise.You can chase by sourcetype
Or by antecedent which is set by Lambda action to a absence amount of ‘lambda:’:
Bonus cartage & aegis dashboards!
By application Lambda-based abstracts ingestion, not alone you can account from the simple bureaucracy above, but you can additionally advantage the avant-garde dashboards & adult cartage & aegis assay of VPC breeze logs that appear with Splunk App for AWS. If you set the actual sourcetype ‘aws:cloudwatchlogs:vpcflow’ as apparent in accomplish aloft (or alternatively rename any custom sourcetype you accept to ‘aws:cloudwatchlogs:vpcflow’) , again you should see accordant dashboards abide automatically. Already installed, cross to Splunk App for AWS, and appearance ‘VPC Breeze Logs: Cartage Analysis’ dashboard beneath Cartage & Access dropdown card and ‘VPC Breeze Logs: Aegis Analysis’ dashboard beneath Aegis dropdown menu:
If you’re not seeing contest in Splunk, you can troubleshoot this one activity date at a time afterward the abstracts breeze direction:
We’ve apparent you how you can configure a low-overhead & awful scalable abstracts activity to beck your admired CloudWatch Logs into your absolute Splunk Enterprise by leveraging AWS Lambda & Splunk HEC together. That abstracts activity enables a real-time processing & assay of abstracts by Splunk Enterprise.
As an archetype of CloudWatch Logs, we acclimated VPC Breeze logs that are stored in CloudWatch. That abstracts is analytical to accept the cartage in a VPC and any aegis considerations. However, agenda that VPC breeze logs are themselves captured every few minutes, so the assay of VPC Breeze logs can alone be done in batches.
Bang actuality to get started with Lambda blueprints for Splunk anon from your AWS Console. We attending advanced to see how you’ll advantage the ability of AWS Lambda & Splunk HEC to body your own serverless architectures and abstracts pipelines. Leave us a agenda beneath with any acknowledgment or comment, or on Splunk Answers for any catechism you may have.
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