Verify Deployments with Splunk

This topic shows you how to verify deployments with Splunk.

Harness CV integrates with Splunk to:

• Verify that the deployed service is running safely and performing automatic rollbacks.

• Apply machine learning to every deployment to identify and flag anomalies in future deployments.

This topic covers how to add and configure Splunk as a Health Source for the Verify step.

Before You Begin

Add Splunk as a verification provider

Review: CV Setup Options

To use the Verify step, you will need a Harness Service Reliability Management Monitored Service. In the simplest terms, a Monitored Service is basically a mapping of a Harness Service to a service monitored by your APM or logging tool.

You can set up a Monitored Service in the Service Reliability Management module or in the Verify step in a CD stage. The process is the same.

No matter where you set up the Monitored Service, once it's set up, it's available to both Service Reliability Management and CD modules.

In this topic we'll set up the Monitored Service as part of the Verify step.

Step 1: Add Verify Step

There are two ways to add the Verify step:

• When selecting the stage deployment strategy: The Verify step can be enabled in a CD stage the first time you open the Execution settings and select the deployment strategy. When you select the deployment strategy you want to use, there is also an Enable Verification option. Select the Enable Verification option. Harness will automatically add the Verify step. For example, here is a stage where Canary strategy and the Enable Verification option were selected.

• Add the Verify step to an existing Execution setup: You can also add the Verify step to the Execution section of a CD stage in a Pipeline you previously created. Simply click Add Step after the deployment step, and then select Verify.

Step 2: Enter Name and Timeout

In Name, enter a name for the step.

In Timeout, enter a timeout value for the step.

You can use:

• w for weeks

• d for days

• h for hours

• m for minutes

• s for seconds

• ms for milliseconds

The maximum is 53w.Timeouts can be set at the Pipeline level also.

Step 3: Select a Continuous Verification Type

In Continuous Verification Type, select a type that matches your deployment strategy.

Step 4: Create a Monitored Service

In Monitored Service, click Click to autocreate a monitored service.

The option to auto-create a monitored service is not available if you have configured either a service, an environment, or both as runtime values. When you run the pipeline, Harness concatenates the service and environment values you enter in the runtime inputs screen and generates a monitored service name. If a monitored service with the same name exists, Harness assigns it to the pipeline. If no monitored service that matches the generated monitored service name exists, Harness skips the verification step.

For example, suppose you enter the service as todolist and the environment as dev. In that case, Harness generates the monitored service name todolist_dev, checks whether a monitored service with the name todolist_dev is available, and assigns it to the pipeline. If no monitored service is available with the name todolist_dev, Harness skips the verification step.

Step 5: Add Health Sources

This option is available only if you have configured the service and environment as fixed values.

A Health Source is basically a mapping of a Harness Service to the service in a deployment environment monitored by an APM or logging tool.

1. In Health Sources, click Add. The Add New Health Source settings appear.

   
2. In Select health source type, select Splunk.

3. In Health Source Name, enter a name for the Health Source.

4. Under Connect Health Source, click Select Connector.

5. In Connector settings, you can either choose an existing connector or click New Connector.

6. Click Apply Selected. The Connector is added to the Health Source.

   
7. In Select Feature, select the Splunk feature to be used.

8. Click Next. The Customize Health Source settings appear. The subsequent settings in Customize Health Source depend on the Health Source Type you selected. You can customize the metrics to map the Harness Service to the monitored environment in Query Specifications and Mapping settings.

   
9. Click Map Queries to Harness Services drop down.

10. Enter a name for the query in Name your Query.

11. Click Select Query to select a saved query. This is an optional step. You can also enter the query manually in Query.

12. Click Fetch Records to retrieve the details. The results are displayed under Records.

13. Once the records are fetched, click the plus icon in Identify Service Instance to select the path for service instance.

14. Click Submit. The Health Source is displayed in the Verify step.

You can add one or more Health Sources for each APM or logging provider.

Step 6: Select Sensitivity

1. In Sensitivity, select High, Medium, or Low based on the risk level used as failure criteria during the deployment.

Step 7: Select Duration

Select how long you want Harness to analyze and monitor the logs/APM data points. Harness waits for 2-3 minutes to allow enough time for the data to be sent to the APM/logging tool before it analyzes the data. This wait time is a standard with monitoring tools.

The recommended Duration is 10 min for logging providers and 15 min for APM and infrastructure providers.

Step 8: Specify Artifact Tag

1. In Artifact Tag, use a Harness expression to reference the artifact in the stage Service settings.

The expression <+serviceConfig.artifacts.primary.tag> refers to the primary artifact.

Option: Advanced Settings

In Advanced, you can select the following options:

• Step Skip Condition Settings

• Step Failure Strategy Settings

• Select Delegates with Selectors

See Advanced Settings.

Step 9: Deploy and Review Results

1. After setting up the Verify step, click Apply Changes.

2. Click Run to run the pipeline.

3. In Run Pipeline, select the tag for the artifact if a tag was not added in the Artifact Details settings.

4. Click Run Pipeline.

5. When the Pipeline is running, click the Verify step. You can see that the verification takes a few minutes.

Once verification is complete, the Verify step shows the following:

The risk level might initially display a number of violations, but the red and orange colored host often change to green over the duration.

Summary

The Summary section shows the number of logs and metrics that are in violation.

Console View

Click Console View or simply click View Details in Summary to take a deeper look at verification.

Click Filter by Cluster Type to drill down the metrics based on known events, unknown events, or unexpected frequency.

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