The core dump target has not been configured and the host core dump cannot be saved

php editor Apple will introduce you to a common problem in this article: "The core dump target has not been configured and the host core dump cannot be saved." This is an error message that often appears in host management systems. It means that the system cannot save the host core dump file, making it impossible to perform related troubleshooting and analysis. In the following content, we will explain the cause and solution of this problem in detail to help you quickly solve this problem.

Fix No coredump target has been configured, unable to save host coredump

If "No coredump target has been configured," appears when running Esxcli commands or making certain changes to the disk. Host core dumps Cannot save in VMWare" message, please follow the below mentioned solutions to resolve the issue.

Creating dump files for ESXi hosts Enable coredump on USB and create partitions to disable warnings

Let’s talk about them in detail.

1]Create dump files for ESXi hosts

If you use iSCSI storage for ESXi hosts (including booting from SAN), you must create dump files for them.

First of all, you have to create an empty dump file using the below mentioned command.

esxcli system coredump file add -d *your_datastore_name* -f *the_dumpfile_name(I use the ESXi hostname)*

Then, configure the newly created file as an active dump file.

esxcli system coredump file set -p /vmfs/volumes/*your_datastore_name*/vmkdump/*the_dumpfile_name*.dumpfile最后，运行下面提到的命令来确认您的转储文件。

esxcli system coredump file list

You will receive an event notifying you that the core dump was set, and your warning will disappear.

2] Enable coredump on USB and create a partition

If you use USB, you need to enable coredump and create a partition. Please follow the steps below.

First, go to Warnings, then Configure System > Advanced System Settings. Now, click the "Edit" button and filter using the keyword VMkernel.Boot.allow and find VMkernel.Boot.allowCoreDumpOnUsb. You must then change the value associated with VMkernel.Boot.allowCoreDumpOnUsb to true. After connecting to the host via SSH, use the command "esxcli storage filesystem list" to find available local storage locations of type VMFS-L. Then run the following command.

esxcli 系统核心转储文件添加 -d DATASTORE -f 主机名 -s 2000

Runesxcli system coredump file listConfirm whether the coredump file has been created. If False is displayed under Active , please run the command – esxcli system coredump file set -s -e=True . It will set it to true.

This will do the job for you. But we will still try to connect to the host via SSH and search for available storage locations. Please follow the steps mentioned below.

First, run the command mentioned below.

esxcli storage filesystem list

run the below mentioned command to create the core dump file. Make sure to replace datastore and hostname in the command mentioned below.

esxcli system coredump file add -d DATASTORE -f HostName -s 2000

executes the command to check whether a core dump file is created.

esxcli system coredump file list

Finally, run the below mentioned command to enable core dump files.

esxcli system coredump file set -s -e=True

Hope this is useful to you.

3]Disable Warning

If you don't like the message displayed and want to disable it, simply go to ESXi Host > Configuration > Advanced Settings, look for UserVars.SuppressCoredumpWarning, and Set its value to 1.

How to configure core dump on vCenter?

To configure core dump on VCenter you need to go to Home > Administration > System Configuration > Services and select the ESXi Dump Collector service and click on the Actions tab Enable it. After enabling the coredump service, you can start it by selecting the option under the Action menu.

What is a VMware core dump file?

Core dumps are useful for debugging and analyzing ESX hosts that may have crashed due to a kernel panic. You can identify a kernel panic by the appearance of a purple screen, also known as PSOD (similar to the Windows "Blue Screen of Death"). Starting with VMWare ESX 5.5, users can create core dumps to files instead of partitions, which provides greater flexibility and convenience.

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