How to manage VMs on an ESXi that's removed from vCenter?

If you remove an ESXi from a vCenter - what options do you have for then monitoring the VMs that reside on that ESXi?
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amigan_99Network EngineerAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Use the vSphere Client or if using 6.5/6.7, use the host client! (web browser!)

see here

Part 2: HOW TO: Connect to the VMware vSphere Hypervisor 5.1 (ESXi 5.1) using the vSphere Client

(valid for 5.x and 6.0)

Part 2: HOW TO: Connect to the VMware vSphere Hypervisor 6.5 (ESXi 6.5) using the vSphere (HTML5 Web) Host Client 6.5

(valid for 6.5, 6.7 and later)

Depending upon what you want to do, you could login using SSH (console access) and use esxtop

HOW TO:  Performance Monitor vSphere 4.x or 5.0

(valid for all versions of ESXi)
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Jane UpdegraffSr. Systems AdministratorCommented:
Agree with Andrew. But if you don't have vSphere loaded you can usually find the right version at https://<hostname> where <hostname> is replaced with the name of your ESXi server ... or if you have the wrong version of vSphere and you don't want to uninstall it, sometimes you can go straight to the web page on the host, so you might try using https://<hostname>/ui/#/login from inside your network. As above, in that path, <hostname> needs to be replaced with the name of your ESXi server ... you might need to use the fully qualified name, like hostname.domain.com or it might be OK to just enter the hostname alone ... and if you do not have the hostname, you can use the IP address instead.
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David SankovskySenior SysAdminCommented:
I'll just throw my 2 cents in regards to the question itself and some of the answers provided.

Andrew is without a doubt the foremost expert I've seen on this website when it comes to VMWare products, all the suggestions and links he provided are perfect and probably give you what you need.

As to Jane's comment - It is technically correct however you should note that in some cases, web access might be disabled while in others it may be the only way to access your ESXi server (versions 6.7 and above)

As to the question itself - the wording gives some room for speculation in regards to what specifically do you want to monitor - the VM as a VM (Power State, DataStore latency, Other virtualization specific parameters) or perhaps specific services or Operating System Parameters (Page File Size, Disk Usage, CPU Usage and etc.). In case of the former, Andrew's comments are the way to go, if it's latter, however, you should consider a software build specifically for Monitoring (Notable examples are PRTG, Nagios, CheckMK, Zabbix and many many others)
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amigan_99Network EngineerAuthor Commented:
Thanks much guys. I don't look at these ESXi often and suddenly I'm being evicted from the vCenter. But I downloaded the client and I'm on each one and perhaps I'll add it to another vCenter.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you have more than one ESXi host, and you are Licensed, you've got more management options, if managing with vCenter Server.

Benefits of vCenter is management of all hosts via a single pain of glass, e.g. not having to logon to each one (ESXi Host).

and being able to use more functions if licensed.
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