How to use Managed Service Accounts with vCenter Server - Logo

Many of the IT environments have so called security driven approach. Every time I hear that something has to be implemented it is because security said so. Don’t get me wrong – by all means I like to be secure and compliant. In my opinion there should be balance between Security and Costs.

I have found very nice chart which shows that.

Security estimation

In Today post I will show you how to configure vCenter Server to work with MSA.

Managed Service Account and Group Managed Service Account – what is that?

Managed Service Account was introduced by Microsoft with release of Windows Server 2008 R2.The best description is from Microsoft Technet Article.

The managed service account is designed to provide crucial applications such as IIS with the isolation of their own domain accounts, while eliminating the need for an administrator to manually administer the service principal name (SPN) and credentials for these accounts. It is a managed domain accounts that provides automatic password management and simplified SPN management. Virtual accounts are “managed local accounts” that can use a computer’s credentials to access network resources.

Group Managed Service Accounts was released with Windows Server 2012.

The group Managed Service Account provides the same functionality within the domain but also extends that functionality over multiple servers.

Unfortunately MSA was not ideal solution to most user problems due to limitations. With release of gMSA many more use cases might be found to use them. See table below with supported applications with MSA and gMSA supported applications.

Managed Service Accounts Group Managed Service Accounts
Microsoft Exchange Supported Supported
Microsoft IIS Supported Supported
Microsoft SQL Server Not Supported Supported
Task Scheduler Not Supported Supported

Which MSA should I use then some of you might ask. That depends how will you plan your environment. If you want to use same MSA account on several computers than you should use gMSA. If you will use MSA account on one server than you should use MSA.

Managed Service Account and Group Managed Service Account- prerequisites

Managed Service Accounts require the Active Directory schema to be updated to the Server 2008 R2 version.

Group Managed Service Accounts require the Active Directory schema to be updated to the Server 2012 version.

In my test lab I will show you how to run vCenter Server services and Microsoft SQL Server using Managed Service Accounts.

Managed Service Account creation

  1. Open PowerShell and import module Active Directory.
  2. To create a standalone managed service account which is linked to a specific computer, we will use the -RestrictToSingleComputer parameter in New-AdServiceAccount command.
  3. In the next step we will associate newly created MSA account to computer.
  4. On the target computer where we will install MSA open PowerShell, install Active Directory module (if it is not installed previously).
  5. Import Active Directory module (see first step) and install MSA account.
  6. Last step is to change log on account. Remember to clear password and Confirm password fields.
  7. Newly added account to service will be granted Log On As A Service right.

VMware vCenter Server Services

Below you can find all vCenter Server services. In third column you can see MSA account names.

Service Display Name Service Name MSA account name
VMware afd Service VMWareAfdService vmvafd
VMware Certificate Service VMWareCertificateService vmcertservice
VMware Component Manager VMwareComponentManager vmcomponentmgr
VMware Content Library Service vdcs vmcontentlibr
VMware Directory Service VMwareDirectoryService vmdirservice
VMware ESX Agent Manager EsxAgentManager vmesxmanager
VMware HTTP Reverse Proxy rhttpproxy vmrhttproxy
VMware Identity Management Service VMwareIdentityMgmtService vmidentservice
VMware Inventory Service invsvc vminvservice
VMware License Service vmware-license vmlicservice
VMware Message Bus Config Service mbcs vmmbcs
VMware Performance Charts vmware-perfcharts vmperfchar
VMware Security Token Service VMwareSTS vmsts
VMware Service Control Agent VMwareServiceControlAgent vmsvcctrlag
VMware Syslog Collector vmSyslogCollector vmsyslogcoll
VMware System and Hardware Health Manager vmwarevws vmhwmanager
VMware USB Arbitration Service VMUSBArbService vmusbarbit
VMware vAPI Endpoint vapiEndpoint vmvapiend
VMware vCenter Configuration Service vmware-cis-config vmcisconfig
VMware vCenter workflow manager vmware-vpx-workflow vmvpxworkflow
VMware VirtualCenter Server vpxd vmvpxd
VMware vService Manager VServiceManager vmvservicemng
VMware vSphere Auto Deploy Waiter vmware-autodeploy-waiter vmadwaiter
VMware vSphere ESXi Dump Collector vmware-network-coredump vmdumpcoll
VMware vSphere ESXi Dump Collector WebService VMWareNetworkCoredumpWebserver vmdumpcollweb
VMware vSphere Profile-Driven Storage Service vimPBSM vmpdss
VMware vSphere Web Client vspherewebclientsvc vmwebclient

The next step is to import all MSA accounts to target computer. I simply added accounts using Computer Management.

How to use Managed Service Accounts with vCenter Server - 3

Once we have all accounts added to local Administrators groups we will stop all vCenter Services and replace user accounts associated to each service.

How to use Managed Service Accounts with vCenter Server - 4

I had to add WOJCIEH\vminvservice$, WOJCIEH\vmvpxd$ account as security login to vCenter Server and MSDB databases. This is needed to start vCenter Server service. If you will not do it you will see errors like this.

How to use Managed Service Accounts with vCenter Server - 5

After all changes and some tweaking we have fully functional vCenter Server running with MSA accounts.

How to use Managed Service Accounts with vCenter Server - 6

Virtual Accounts

However with vCenter Server 6.0 new concept of virtual accounts was introduced. Following VMware KB explains this concept: Use of virtual accounts for services on a Windows vCenter Server 6.0 (2124709) .From VMware KB we see that following services are used as virtual accounts.

Service Service Account
VMware Component Manager NT SERVICE\VMwareComponentManager
VMware Content Library Service NT SERVICE\vdcs
VMware ESX Agent Manager NT SERVICE\EsxAgentManager
VMware Message Bus Config Service NT SERVICE\mbcs
VMware Performance Charts NT SERVICE\vmware-perfcharts
VMware Postgres NT SERVICE\vPostgres
VMware vAPI Endpoint NT SERVICE\vapiEndpoint
VMware vCenter workflow manager NT SERVICE\vmware-vpx-workflow
vmware vService Manager NT SERVICE\VServiceManager
VMware vSphere Audo Deploy Waiter NT SERVICE\vmware-autodeploy-waiter
VMware vSphere Web Client NT SERVICE\vspherewebclientsvc

As VMware guru you have to consider all cons and pros of each solution and decide to go with MSA accounts or not.

Summary

It took me a while to check prepare this post but I am happy that I could prove that MSA accounts are working as well with vCenter Server. What is unknown if VMware Support will help you if you are using MSA accounts. If you wish I can check as well if Group Managed Accounts are working with vCenter Server 6.0.

How to use Managed Service Accounts with vCenter Server
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Wojciech Marusiak
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Wojciech Marusiak

Senior Solutions Cloud Architect at Consort CT
I am innovative and experienced VMware and Windows Server Engineer with over 10 years in the IT industry specializing in VMware virtualization and Microsoft Server environment.

My experience and skills have been proven by leading vendor certifications like VMware Certified Implementation Expert 6 – Data Center Virtualization, VMware Certified Advanced Professional 6 – Data Center Virtualization Design, VMware Certified Professional 6 - Data Center Virtualization, VMware Certified Professional 6 - Network Virtualization, AWS Certified Solutions Architect - Associate, ITIL V3, VMware vExpert 2014 - 2017 and VMware vExpert NSX 2017 Award.

My blog wojcieh.net - was voted #43 in Top vBlog 2017 contest!
Wojciech Marusiak
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