@Rocky 1. Why doesn’t StarRocks provide a built-in mechanism to renew Kerberos tickets automatically? 2. How do other StarRocks users usually handle ticket renewal in production env?

StarRocks does not currently provide a built-in mechanism to automatically renew Kerberos Ticket Granting Tickets (TGTs). Instead, it relies on external system-level or infrastructure-level tools to manage ticket lifecycles. 1. Why isn't there a built-in mechanism? While there isn't an official "philosophical" statement in the docs, the design follows a common pattern in distributed systems: * Separation of Concerns: StarRocks focuses on the query engine and data processing. Security infrastructure like Kerberos ticket maintenance is typically treated as a prerequisite environment task, similar to mounting file systems or configuring network NTP. * System Dependencies:

kinit

and ticket management are often tied to the underlying OS configuration (

/etc/krb5.conf

) and specific Kerberos client binaries. Delegating this to the OS (via cron) or the orchestrator (via sidecars) ensures compatibility with the user's specific security environment. * Security Scoping: Renewing tickets requires access to a keytab file. Handling these secrets and managing the renewal logic inside the FE/BE processes adds complexity and potential security surface area that is already well-handled by dedicated tools. 2. How production users handle renewal In production environments, StarRocks users typically handle Kerberos renewal using one of the following two methods, depending on their deployment model: A. Bare Metal or VM Deployments (Cron Jobs) This is the official recommendation in the StarRocks documentation. Users set up a

cron

job on every FE and BE node to run

kinit

periodically before the ticket expires. * Command:

kinit -kt <keytab_path> <principal>

* Example Cron:

bash
    # Renew the ticket every 6 hours
    0 _/6 _ _ _ /usr/bin/kinit -kt /path/to/starrocks.keytab starrocks/hostname@REALM.COM

B. Kubernetes Deployments (Sidecar Containers) For StarRocks running on Kubernetes (e.g., via the StarRocks Operator), the common practice is to use a Kerberos sidecar container. * Mechanism: A small container runs alongside the FE/BE in the same Pod. It shares a volume containing the ticket cache (typically

/tmp

). * Function: The sidecar container runs a script that executes

kinit

in a loop (e.g., every few hours). Because the ticket cache is in a shared volume, the StarRocks process in the main container can always access a valid, refreshed TGT. Summary of Requirements Regardless of the renewal method, ensure the following are configured in StarRocks: 1. JVM Options: Add

-Djava.security.krb5.conf=/etc/krb5.conf

to

fe.conf

and

be.conf

. 2. Host Mapping: Ensure

/etc/hosts

contains the mappings for all KDC and Hadoop nodes if they aren't in DNS. 3. Environment: Ensure the

KRB5CCNAME

environment variable (if used) points to the correct shared ticket cache location. References • data_source/catalog/kudu_catalog.md • data_source/catalog/hive_catalog.md • data_source/catalog/unified_catalog.md • data_source/catalog/hudi_catalog.md