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The vCenter Log Partition Runbook: Find Growth, Preserve Evidence, Restore Headroom

ai, AI (Artificial Intelligence), Artificial Intelligence, log disk exhaustion, monitoring, operations, runbook, SDDC Manager, support bundle, troubleshooting, VAMI, vCenter Server, VCF, vCF (VMware Cloud Foundation), VCSA, VMware Cloud Foundation, vSphere

A full /storage/log partition on a vCenter Server Appliance is not just a housekeeping problem. It is a management-plane risk. In a standalone vSphere environment, it can interrupt administration, log collection, patching, and service stability. In VMware Cloud Foundation, the blast radius is larger because vCenter is tied into SDDC Manager workflows, workload domain lifecycle […]

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EAM Certificate Trust Failures: Why vSphere Extensions Break After Certificate Changes

ai, AI (Artificial Intelligence), Artificial Intelligence, CertificateNotTrusted, CertificateNotTrustedFault, EAM, ESX Agent Manager, SDDC Manager, TRUSTED_ROOTS, vCenter Server, VCF, vCF (VMware Cloud Foundation), VECS, VMware Cloud Foundation, vSphere

Certificate changes in vSphere environments rarely fail in only one place. The obvious place to look is the browser warning, the expired certificate alarm, or the service that recently had its Machine SSL certificate replaced. But in production VMware Cloud Foundation and vSphere environments, certificate changes can also break something less visible: the extension and

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vCLS Retreat Mode: When to Use It, What It Breaks, and How to Exit Cleanly

ai, AI (Artificial Intelligence), Artificial Intelligence, DRS, operations, runbook, vCenter Server, VCF, vCF (VMware Cloud Foundation), vCLS, vSAN, vSphere

Disable vCLS on a Cluster via Retreat Mode KB 316514 vSphere Cluster Services usually stay in the background until they get in the way of something operational. Most teams first notice vCLS when a cluster task is blocked, a warning appears after maintenance, or a handful of small system VMs show up and someone asks

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VM Network Troubleshooting from Guest OS to Uplink: A Layer by Layer VMware Runbook

ai, AI (Artificial Intelligence), Artificial Intelligence, ESXi, NSX DFW, pktcap-uw, port group, runbook, troubleshooting, vCenter Server, vCF (VMware Cloud Foundation), vDS, VLAN, vmnic, VMware Cloud Foundation, vSphere

Virtual machine network problems rarely arrive with a clean label. The ticket usually says something like “the VM is unreachable,” “the application cannot connect,” “ping fails,” “internet access is down,” or “VMs on different hosts cannot talk.” The underlying cause might be inside the guest OS, on the VM’s virtual NIC, in the port group,

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“No Healthy Upstream” Is Often a Certificate Problem: A vCenter Triage Runbook for KB 316619

ai, AI (Artificial Intelligence), Artificial Intelligence, certificate management, Lookup Service, No Healthy Upstream, STS Certificate, vCenter Server, vCert, VCF, vCF (VMware Cloud Foundation), VCSA, vSphere

You open the vSphere Client and instead of the inventory, you get a blunt message: No Healthy Upstream Sometimes the symptom is more explicit. The login flow may fail with: HTTP Status 400 – Bad Request Signing certificate is not valid Other times the vCenter Server Appliance looks partially alive from the outside, but core

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Why Large VM vMotion and Clone Tasks Fail: Device Limits, Config Hygiene, and PowerCLI Prechecks

ai, AI (Artificial Intelligence), Artificial Intelligence, DVS, ESXi, Migration Precheck, Operational Runbook, powercli, Storage vMotion, vCenter Server, VCF, VCF (Cloud Foundation), VM Cloning, vMotion, vSphere

Done — I removed the extra line breaks/page-break-style spacing. The only preserved line breaks are inside the ASCII workflow and PowerCLI script so they remain usable. Why Large VM vMotion and Clone Tasks Fail: Device Limits, Config Hygiene, and PowerCLI Prechecks Large VM migrations usually fail at the worst possible time: late in the change

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The VMCA Reset Decision: When Regenerating vSphere Certificates Is the Right Move

ai, AI (Artificial Intelligence), Artificial Intelligence, certificate-manager, NSX Compute Manager, runbook, SDDC Manager, STS Certificate, trust chain, vCenter Server, vCert, VCF, VECS, VMCA, vSphere

Certificates in vSphere are easy to underestimate until they become the reason vCenter will not authenticate, services will not start cleanly, NSX loses trust in its Compute Manager, or SDDC Manager stops interacting with the management domain the way it should. That is why a VMCA reset should not be treated as a generic “renew

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The VMCA Reset Decision: When Regenerating vSphere Certificates Is the Right Move

ai, AI (Artificial Intelligence), Artificial Intelligence, certificate-manager, NSX Compute Manager, runbook, SDDC Manager, STS Certificate, trust chain, vCenter Server, vCert, VCF, VECS, VMCA, vSphere

Certificates in vSphere are easy to underestimate until they become the reason vCenter will not authenticate, services will not start cleanly, NSX loses trust in its Compute Manager, or SDDC Manager stops interacting with the management domain the way it should. That is why a VMCA reset should not be treated as a generic “renew

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From Fixcerts to vCert: A Safer vCenter Certificate Recovery Path

ai, AI (Artificial Intelligence), Artificial Intelligence, certificates, Enhanced Linked Mode, Fixcerts, NSX, runbook, SDDC Manager, STS, vCenter Server, vCert, VCF, VECS, VMCA, vSphere

vCenter certificate problems rarely arrive as clean, isolated maintenance tasks. They usually show up as failed logins, services that refuse to start, upgrade prechecks that suddenly block progress, or downstream trust failures in NSX, SDDC Manager, backup tools, monitoring platforms, or automation. By the time an operator is searching for “Fixcerts,” the environment is often

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From Fixcerts to vCert: A Safer vCenter Certificate Recovery Path

ai, AI (Artificial Intelligence), Artificial Intelligence, certificates, Enhanced Linked Mode, Fixcerts, NSX, runbook, SDDC Manager, STS, vCenter Server, vCert, VCF, VECS, VMCA, vSphere

vCenter certificate problems rarely arrive as clean, isolated maintenance tasks. They usually show up as failed logins, services that refuse to start, upgrade prechecks that suddenly block progress, or downstream trust failures in NSX, SDDC Manager, backup tools, monitoring platforms, or automation. By the time an operator is searching for “Fixcerts,” the environment is often

From Fixcerts to vCert: A Safer vCenter Certificate Recovery Path Read More »