Unable to power on VMs with error "All required agent virtual machines are not currently deployed on host 'hostname''"

Products

• VMware vCenter Server

Issue/Introduction

Similar entries may show in vpxd.log: 

<timestamp> info vpxd[3634997] [Originator@6876 sub=cdrsPlmt opID=CdrsLoadBalancer-5b269634] Vm [vim.VirtualMachine:<vm_id>,<vm_name>] failed constraint check false on host [vim.HostSystem:<host_id>,<host_name>] with <obj xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:vim25" versionId="8.0.3.0" xsi:type="LocalizedMethodFault"><fault xsi:type="InsufficientAgentVmsDeployed"><hostName>host_name</hostName><requiredNumAgentVms>1</requiredNumAgentVms><current
NumAgentVms>0</currentNumAgentVms></fault><localizedMessage></localizedMessage></obj>

 

Environment

VMware vCenter Server 

 

Cause

A solution requires that an agent VM be on the host. If there are any issues with the agency/solution and/or its no longer in use, this can cause issues with powering on a VM. 

Resolution

1. Login to the vSphere Client UI 
2. Click on the hamburger menu button 
3. Click Administration > vSphere Client Extensions > VMware ESX Agent Manager > Configure 
4. Resolve any agencies that are required or remove any that are no longer needed