My KVstore is Down After Splunk 9.4? Here's How to Fix It
Splunk 9.4 upgrade brings significant security and performance enhancements, but it also introduces complexities, particularly with KVstore and SSL certificate configurations. This guide provides a detailed walkthrough of the upgrade process, focusing on essential precautions and troubleshooting steps to ensure a smooth transition.
Learn how to navigate the technical challenges of Splunk 9.4 and optimize your security operations.
Splunk 9.4 KVstore Upgrade Troubleshooting: Upgrading from 9.3.X is Essential
Direct upgrades from Splunk versions prior to 9.3.X to 9.4 can lead to critical issues with KVstore, a vital component for data storage and management. Splunk 9.4 mandates that KVstore runs version 4.2 or higher before the upgrade. This section provides the steps to verify and, if necessary, upgrade your KVstore.
1.1 Verifying KVstore Version and Status
Before upgrading to Splunk 9.4, ensure the following:
Use the following command to check:
$SPLUNK_HOME/bin/splunk show kvstore-status --verbose
Expected output:
If KVstore is not version 4.2, follow Splunk's official instructions: Upgrade the KV Store Server Version
Splunk 9.4 SSL Certificate Requirements: Ensuring Correct ExtendedKeyUsage for KVstore
A critical aspect of a successful Splunk 9.4 upgrade involves verifying and, if necessary, updating your SSL certificates. Specifically, the KVstore component requires that SSL certificates include both serverAuth and clientAuth within the extendedKeyUsage field. Failure to meet this requirement can lead to KVstore startup failures and operational disruptions. This section will guide you through verifying your certificate's configuration and resolving any discrepancies.
2.1 Identifying SSL Certificate Issues with KVstore
After upgrading to Splunk 9.4, KVstore may fail to start if SSL certificates lack both serverAuth and clientAuth. Common error messages include:
WARN MongoClient [3578138 KVStoreConfigurationThread] - Disabling TLS hostname validation for localhost ERROR KVStoreConfigurationProvider [3578138 KVStoreConfigurationThread] - Failed to start mongod on first attempt reason=Failed to receive response from kvstore error=, service not ready after waiting for timeout=301816ms
2.2 Verifying SSL Certificate Configuration
Use this command to check certificate details:
$SPLUNK_HOME/bin/splunk cmd openssl x509 -noout -text -in <certificate.pem>
Expected output:
X509v3 Extended Key Usage:
X509v3 Key Usage:
Ensure both serverAuth and clientAuth are present in the Extended Key Usage section.
2.3 Resolving Incorrect SSL Certificates
If your certificate does not have the correct Extended Key Usage settings, you’ll need to create a new certificate with the appropriate settings. This can be done using the OpenSSL command, ensuring that both serverAuth and clientAuth are included in the certificate.
Use the following command to verify the certificate against a CA:
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$SPLUNK_HOME/bin/splunk cmd openssl verify -verbose -x509_strict -CAfile <CA_FILE.pem> <certificate.pem>
Expected output:
/opt/splunk/etc/auth/mycerts/enterprise.pem: OK
For more details, refer to the Splunk Certificate Issue Documentation: SSL Certificate Issue for KVStore on Splunk 9.4
KVstore 7.0 Automatic Upgrade: Performance and Security Enhancements
Splunk 9.4 automatically upgrades KVstore to version 7.0, enhancing performance and security. This section explains the benefits and how to verify the upgrade.
3.1 Benefits of KVstore 7.0
Splunk 9.4 does this automatically as part of the upgrade process, so you don’t need to manually intervene in upgrading the KVstore server to version 7.0. However, verifying the upgrade is always a good idea to ensure everything went smoothly.
3.2 Verifying KVstore 7.0 Upgrade
Use the same command as before:
$SPLUNK_HOME/bin/splunk show kvstore-status --verbose
Expected output:
You can also see migration messages in the Splunk UI. If KVstore is not version 7.0 or is "unready," check the logs for errors.
PostgreSQL Binaries in Splunk 9.4: Addressing Security Scanner Alerts
With the release of Splunk 9.4, some users may notice unexpected notifications or alerts from security scanners regarding the presence of PostgreSQL binaries in the Splunk bin folder. These alerts can cause confusion, as the release notes for Splunk 9.4 do not explicitly mention the inclusion of PostgreSQL binaries.
4.1 Understanding PostgreSQL Binary Inclusion
Upon investigation, it has been determined that PostgreSQL binaries are indeed included in Splunk 9.4. However, it’s important to note that this inclusion appears to be part of Splunk’s internal workings and not necessarily a security concern. The binaries are used by Splunk for certain internal features and are not exposed or used for PostgreSQL database operations in the typical sense.
4.2 Verifying Splunk Integrity
PostgreSQL binaries are located in:
$SPLUNK_HOME/bin/
Verify Splunk's integrity using:
$SPLUNK_HOME/bin/splunk validate files
Splunk can automatically do so by checking the Splunk Checksum against the official hashes provided by Splunk. This ensures that no unauthorized changes have been made to your Splunk installation.
Connect & Optimize Your Splunk 9.4 Upgrade
Have you encountered these challenges during your Splunk 9.4 upgrade? Share your experiences and questions in the comments below. Let's connect and discuss how to optimize your Splunk environment. For expert assistance, feel free to reach out to our team CrossRealms International
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