Backup fails with „Cannot find Linux guest credentials“ in Veeam Backup & Replication v10

Yesterday I had a scheduled update of his Veeam Backup & Replication installation with one of my customers. We planned to go from version 9.5 Update 4b (9.5.4.2866) to version 10 GA (10.0.0.4461).

As usual, I created an encrypted configuration backup before the update for safety reasons. How this works and why you should encrypt the configuration backup you can read here and here. I prefer to be a little more cautious at this point, before I have the trouble in hindsight. However, I did not need the configuration backup. The update went smoothly and without problems.

Since I carried out the update during the day, it was not possible, in agreement with the customer, to perform a complete backup run directly after the update. Therefore, I did a short functional test using the Quick Backup capabilities of Veeam Backup & Replication. There were no problems here either.

Today the customer called and reported about failed backup jobs. So I looked into it:

Version 10 GA: Unable to connect to guest OS for guest processing. Cannot find Linux guest credentials
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Bypass NET::ERR_CERT_REVOKED error in Google Chrome on macOS Catalina

In one of their latest updates for macOS Catalina Apple has introduced some new requirements for the acceptance of SSL certificates. The changes are documented here: https://support.apple.com/en-us/HT210176. This means that pages without a corresponding certificate are no longer accessible in Google Chrome. Unfortunately, the default vCenter Server certificate is one of the affected certificates. Unlike other certificate warnings, this error cannot be easily bypassed using Advanced options.

Unable to bypass NET::ERR_CERT_REVOKED error

In the following I would like to show you how you can temporarily work around this issue.

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Conflicting VIBs when updating ESXi using Custom Images/Offline Bundles

As every year, some of my customers use the weeks after Christmas to update their environments. Nearly all of them run their ESXi hosts with vendor-specific Custom Images that provide additional drivers or agents over the standard VMware image. Unfortunately there are almost always problems with conflicting VIBs when they are updated. Of course it was the same this time. In my case, this time it was about a custom image from Fujitsu.

Dependency error when updating ESXi with the custom offline bundle

To perform the update successfully the problematic VIB must be removed. The necessary steps for this I would like to point out below.

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How to migrate running VMs to different datastores without Storage vMotion

Today I learned something very useful that I want to share with you. We have some smaller customers from the SMB segment. Here we often find small vSphere clusters with two or three ESXi hosts. These are usually licensed with vSphere Essentials Plus to use the benefits of vSphere High Availability (vSphere HA). The functions contained in this bundle are quite sufficient for regular operation. One function that is missing in vSphere Essentials Plus is the ability to move running VMs from one Datastore to another using Storage vMotion. In this post I want to share with you a way on how you can still move your running VMs between datastores.

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Datadomain replication fails with „send queue: sending aborted by caller“

Last friday I struggled with some of our Dell EMC Datadomain (DD) Systems. I tried to establish a MTree replication between two identical systems.
The first few steps worked without an issue, so I was confident to get into the weekend early. But then things changed.

Ambiguous error message after replication setup

But first things first. Let’s start with the step by step process on how I enabled the replication.

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Configure the vCenter Server Login message

As a solution provider, my company often installs VMware vSphere environments for customers who do not administer the solution themselves. In addition to restricting user permissions, we have been working with individual login messages in the vCenter Server for some time now. We usually use the login message to remind the customer that the environment is managed by our company and that any changes must be approved in advance.

This post gives you a short overview on how to configure the login message using the vCenter Server administration interface.

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Update to ESXi 6.7 U3 using esxcli fails with error „Failed to setup upgrade using esx-update VIB“

After the gerneral availability of ESXi 6.7 U3, I decided it is time to update my homelab. I used the integrated vSphere Update Manager (VUM) for my nested vSAN Cluster without any issues. During my VCAP-DVC Deploy preparation earlier this year I used an old Intel NUC system to deploy an additional vCenter Server Appliance (VCSA) in order to play around with Enhanced Linked Mode (ELM). I wanted to have the VCSAs in different Layer 3 networks, so I copied the design from the nested cluster and installed a nested router alongside with a nested ESXi host. The nested ESXi is used to host the second VCSA. Due to this design I can not use the integrated VUM of the second VCSA to update this standalone ESXi host.

The virtual machines (VMs) on the standalone ESXi host are not very important, so I decided to shut them down together with the VCSA and update the nested ESXi host via CLI. For details on how to update ESXi 6.x using the CLI, take a look at one of my previous blog posts here. I used this method quite some time so I was certain to have no issues with the update. But this time it was different, the update failed.

esxcli software profile update failes
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Using PowerCLI in preparation of storage migration

In the last weeks I accompanied a customer during the preparation of his storage migration. Among other things, we came up with the usual questions on this subject:

  • On which datastores are my virtual machines located?
  • Are there virtual machines with snapshots?
  • Are CD/DVD drives still connected to certain VMs?

That’s why I played around with PowerCLI and wrote some scripts to get answers to these questions. I leave the setup of the vCenter connection and the parameterization of individual commands to each of you and concentrate here on the central command(s).

List datastores of certain VMs

This small command returns a list of VMs sorted by the name of the VM in a specified cluster, including their datastore and the VM folder.

Get-Cluster -Name <ClusterName> | Get-VM | Select-Object Name,@{N=”Datastore”;E={[string]::Join(‘,’,(Get-Datastore -Id $_.DatastoreIdList | Select-Object -ExpandProperty Name))}},@{N=”Folder”;E={$_.Folder.Name}} | Sort-Object Name

The following example shows the output of the command.

List the datastores of certain VMs

List VMs with Snapshots

The second command creates a list of VMs with snapshots, sorted by name, with information about the name of the snapshot, the date the snapshot was created, and the size of the snapshot.

Get-Cluster -Name <ClusterName> | Get-VM | Get-Snapshot | Sort-Object VM | Format-Table VM,Name,Description,Created,@{ n="SizeGB";e={[math]::round($_.SizeGB,0)}} -AutoSize

Find below a screenshot of the output.

List of VMs with Snapshots

List VMs with CD/DVD drive attached

The last command lists all VMs with a connected CD/DVD drive and the path to the inserted ISO image.

Get-Cluster -Name <ClusterName> | Get-VM | Get-CDDrive | Select-Object @{N="VM";E="Parent"},IsoPath | Where-Object {$_.IsoPath -ne $null} | Sort-Object VM

The following is an example of the output of the command.

List of VMs with attached ISO images

Wrap-Up

PowerCLI makes it really easy for an administrator to find out what dependencies exist prior to storage migration. With the commands shown above, you can quickly and easily get an overview of the current state. If you wish, you can also extend or rewrite the commands accordingly and, for example, completely automatically remove all attached ISO images from the VMs.