XenServer Pool Master is Unable to Boot with Error: "unexpected inconsistency; Run fsck Manually"

The following error is displayed when booting XenServer pool master: "Unexpected inconsistency; Run fsck Manually" The df -h command shows filesystem is read only...

Citrix XenServer Multiple Security Updates (CTX219378)

Security vulnerabilities have been identified in Citrix XenServer that may allow malicious code running within a guest VM to read a small part of hypervisor memory and allow privileged-mode code running within a guest VM to hang or crash the host. SPDX-FileCopyrightText: 2017 Greenbone AG Some te...

How to Setup Time on XenServer Manually When There Is No NTP Server

This is a situation where you don't have an AD , DC ,DNS or an NTP server in the environment to point the servers for syncing time...

Increase RAM for XenServer VM's through Command Line Interface.

Increase RAM for XenServer VM's through Command Line Interface. If the RAM editing option is grayed out through XenCenter...

License Server Error: No Licenses Available for Specified Server Type

When the XenServer is attempted to be licensed you may come across error "The license-server did not issue a license for server "servername" because there were no license for the specified type available"...

Citrix XenServer QEMU ioport Array Overflow Guest-to-Host Privilege Escalation (CTX219136)

The version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by a privilege escalation vulnerability in the QEMU ioport component due to an array overflow that is triggered during the handling of addresses in ioport read and write look-ups. A...

CVE-2016-9637 - Citrix XenServer Security Update

Description of Problem A security vulnerability has been identified in Citrix XenServer that may allow malicious privileged-mode code running within an HVM guest VM to compromise the host. This vulnerability affects all currently supported versions of Citrix XenServer up to and including Citrix...

Citrix XenServer Multiple Vulnerabilities (CTX218775)

The version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the sniffnetware function within file tools/pygrub/src/pygrub when handling string quotes and S-expressions in the bootloader whenev...

Citrix XenServer Multiple Security Updates (CTX218775)

A number of security vulnerabilities have been identified in Citrix XenServer that may allow malicious code running within a guest VM to compromise the host. SPDX-FileCopyrightText: 2016 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the...

Citrix XenServer Security Update for CVE-2016-7777 (CTX217363)

A security vulnerability has been identified in Citrix XenServer that may allow malicious user code within an HVM guest VM to read or modify the contents of certain registers belonging to other tasks within that same guest VM. SPDX-FileCopyrightText: 2016 Greenbone AG Some text descriptions might...

CVE-2016-7777 - Citrix XenServer Security Update

Description of Problem A security vulnerability has been identified in Citrix XenServer that may allow malicious user code within an HVM guest VM to read or modify the contents of certain registers belonging to other tasks within that same guest VM. This vulnerability affects all currently...

How to find the hotfix applied on XenServer ?

Get a list of hotfixapplied on XenServer and when it was applied on the Host both from XenCenter or from the command line...

Supported NFS protocols and how to identify which protocol is being used

Q. What are the supported version of NFS protocol ? How to identify which being used now ? A. NFSv3 is supported with XenServer 6.1,6.2,6.5 and XenServer version 7 supports NFSv3 and NFSv4.If the underlying storage array does not support NFSv4, NFSv3 will be used to mount the share. In order to...

XenServer Host become responsive In Reboot/Shutdown

XenServer hangs on reboot with following message in serial logs Sending all processes the TERM signal... Sending all processes the KILL signal... Saving random seed: Syncing hardware clock to system time Turning off swap: Unmounting pipe file systems: Unmounting file systems: Please stand by whil...

How to troubleshoot / Useful command around openVswitch in XenServer

This article provides information about ovs and command that can be used to troubleshoot ovs related issues...

How to create a raw VDI on XenServer ?

Sometimes when performance is important over other functionalities like snapshot fast clone which are provided by the VHD layer, we need to create raw VDI...

Capturing a continuous network trace( tcpdump ) on XenServer without filling the dom0

In certain situation, we are not sure when will the issue be reproduced and need to keep the network capture running. If the capture is run directly, it may fill up the dom0 filesystem and can crash the XenServer Host...

Generated troubleshooting for NFS related issues on XenServer

This article will give you guidelines for troubleshooting NFS SR related issues on XenServer...

How to find the disk associated to a VM from XenServer CLI

While troubleshooting storage issues, we might need to get the VM's disk and its associated Virtual block devices . This article will help to get the desired details from the VM...

How to take a XenServer toolstack (XAPI) database dump and view it

XenServer stores the vital information related to objects such asVM, VIF, VDI, PBD in an XMLformat file under /var/xapi/state.db.Thisfile is synced between pool membersat regular intervals to maintain aconsistent view of the XenServer pool. We recommend that you back up this XAPIdatabase file. Th...