Lab: VCSA Troubleshooting & Certificate Renewal

VCF 9.0Intermediatevcp-foundation⏱ 105 min

Objectives

Lab: VCSA Troubleshooting & Certificate Renewal

Prerequisites

VCF lab environment deployed and operational

Lab Environment

Standard VCF lab environment for vSphere Foundation 9.0 Support (Support Specialist)

Tasks

Task 1 Lab: VCSA Troubleshooting & Certificate Renewal

VCSA troubleshooting requires understanding the Photon OS layer, PostgreSQL database, and vCenter services. Certificate issues are the most common VCSA problem — expired or mismatched certificates cause service failures across the entire VCF stack.

Step 1

SSH to VCSA: ssh root@vcsa_hostname

Step 2

Check services: service-control --status --all | grep -i "vpxd\|ui\|vpostgres"

Step 3

View certificate expiry: openssl x509 -in /etc/vmware-vpx/ssl/rui.crt -text -noout | grep "Not After"

Step 4

Check disk space: df -h /storage (should show >20% free)

Step 5

Verify DB connectivity: service-control --status vpostgres (should be running)

Step 6

Restart vCenter UI (non-disruptive): service-control --restart vsphere-ui

Step 7

vCenter Web UI should remain responsive; hosts may briefly appear disconnected

Validation Gate

Check: Verify VCSA health: all services running, certificates not expiring within 30 days, disk partitions below 80%, and PostgreSQL database accessible

Expected: service-control --status shows all services green. Certificate Manager shows certificates valid for >30 days. df -h shows all partitions below 80%. psql can connect to VCDB.

Common Errors

Renewing certificates without checking the full certificate chain

Fix: vCenter certificates have dependencies: STS (Security Token Service) → Machine SSL → Solution User certificates. Renewing only Machine SSL without updating STS or solution user certs causes authentication failures. Use Certificate Manager (/usr/lib/vmware-vmca/bin/certificate-manager) to renew all certificates in the correct order.

Not backing up VCSA before certificate operations

Fix: Certificate renewal can fail mid-process, leaving vCenter in an inconsistent state. Always take a VCSA file-based backup (or VM snapshot) before any certificate operation. Recovery from a failed certificate renewal without backup requires manual certificate manipulation.

Ignoring VCSA service health check output

Fix: Run 'service-control --status' to check all vCenter services. Common issues: vpxd stopped (vCenter unavailable), vmware-stsd stopped (SSO broken), vmware-vpostgres stopped (database down). Address service failures in dependency order: database first, then SSO, then vpxd.

Not monitoring VCSA disk space

Fix: VCSA has multiple disk partitions. The /storage/log partition filling up is the most common cause of vCenter instability. Monitor with 'df -h' or vCenter alarm. When log partition exceeds 80%: rotate logs, identify chatty services, and consider increasing log partition size via VCSA management interface.

Final Validation

Lab completed successfully

✓ All steps completed → No errors observed

Cleanup / Restore

• Revert to snapshot if needed

Design Reflection (VCDX)

vCenter availability is critical — a VCSA failure impacts management of the entire domain. VCDX designs should include VCSA monitoring, certificate lifecycle management, and backup/recovery procedures.

Requirements

Monitor VCSA service health and disk space
Manage certificate lifecycle proactively
Maintain VCSA backup for recovery

Constraints

Certificate renewal must follow dependency order
Log partition can fill rapidly during service issues
VCSA backup must be current before certificate operations

Assumptions

VCSA backup runs daily via file-based backup
Certificate expiry monitoring is configured in VCF Operations

Risks

Certificate expiry cascade across VCF components
VCSA instability from log partition exhaustion

⚠ Known Pitfalls (from Community KB)

Attempting certificate renewal without a backup — a failed renewal can leave vCenter unrecoverable without manual intervention.

Ignoring VCSA disk space alerts until the log partition is 100% full — at that point, vCenter services crash.

Mark complete