You may see following errors in ‘
info’ category of error messages in the Cisco UCS Manager after upgrading infrastructure firmware to 3.2.x.
“x/xx on FI-A is connected by a unknown server device”
This is bug documented in
CSCvk76095. You have to reset the port on FI to fix it.
Go to “
” in Cisco UCS Manager. Equipment Go to “
” -> Go to the corresponding FI. Fabric Interconnects Right-click the port x/xx -> Choose “
“. Disable You will see multiple major faults. Wait for 5 seconds.
Right click the port x/xx -> Choose “
“. Enable All warnings disappeared after 5 mins. You may still see the warning in GUI due to cache. Relogin and check.
This change impacts to one link between IOM and the FI port. You need downtime if the IOM only has a single path. I don’t see any impact to ESXi blades in the pod.
You may see error message below when installing standalone patches on Windows Server 2016.
The update is not applicable to your computer
It may be caused be servicing stack update is not installed on the server. Please install
KB4132216 before installing the patch.
The IP configuration of new provisoined Raspberry Pi struggled me a long time. I need to connect to a monitor so I login to system and configure IP address. The problem was I don’t have monitor. I only have a laptop.
Last year, my old laptop dead. I connected the laptop monitor to a HDMI board to my Raspberry Pi. It’s not a low cost solution, it costed me more than $10. And the monitor, cables and board looks uglily.
Actually there is another solution to leveraging laptop keyboard and monitor. It’s serials port to console. Something similar like when you configure Cisco network switches. Following is how to do it. I achieve that on Raspberry Pi 2.
You need to buy a USB to TTL device with chipset CP2102.
Connect the pins to Raspberry Pi 2. Refer
here for GPIO layout.
TXD > Pi RXD Pin #10 (GPIO 16)
RXD > Pi TXD Pin #08 (GPIO 15)
GND > Pi GND Pin #6 Connect the USB to laptop. You will see a device in ‘Device Manager’ needs drivers.
driver and install. Download
Putty and install. Open Putty and “Serial”.
“Serial line” is COM3 or COM4.
“Speed” is 115200.
The USB to TTL I bought on Taobao (Chinese version of Aliexpress). It’s around $1.2 including shipping.
There are two ways to know which network switch ports the network uplinks of Cisco UCS Fabric Interconnects are connected to.
SSH to the Cisco UCS Manager.
Connect to FI-A.
# connect nxos a
Show neighbor of network uplinks.
# show cdp neighbor interface ethernet
<port num> By PowerShell
Cisco PowerTool (For UCS Manager) is installed. Enabling the Information Policy via UCSM GUI.
Go to “
Equipment” -> “ Policies” tab -> “Global Policies” tab -> “ Info Policy” area. Change to “
Enabled“. (No impact to running blades) Open a PowerShell window.
Connect to the UCS Manager.
Show CDP neighbor details.
Following command can shows network switch name, network switch ports and FI ports
# Get-UcsNetworkLanNeighborEntry | Select deviceid,remoteinterface,localinterface
If you prefer to enable the “
Info Policy” by PowerShell, run following command # Get-UcsTopInfoPolicy | Set-UcsTopInfoPolicy -State enabled -Force
You may see following error in Cisco UCS Manager:
default Keyring’s certificate is invalid
The reason is
-> Admin -> Key Management is expired. It’s not possible to delete or change the KeyRing in GUI. You have to log in to SSH of Cisco UCS Manager and run following commands (The strings after “#”): KeyRing default lab-B# scope security
lab-B /security # scope keyring default
lab-B /security/keyring # set regenerate yes
lab-B /security/keyring* # commit-buffer
lab-B /security/keyring #
This will result in a disconnect of the Cisco UCS Manager GUI on your client computer. Just refreshing the page after 5 seconds. It’s no impact to blades.
A few days ago, I deleted some older firmware packages in Cisco UCS Manager. Suddenly more than 100 warnings were generated. The error messages are similar below:
blade-controller image with vendor Cisco System Inc……is deleted Cause: image-deleted
Clearly, it’s triggered due to packages deletion. But all of my service profiles and service profile templates were using existing firmware packages. The deleted packages were not been used anywhere.
I also deleted
download tasks and cleaned up everything I can. The warnings still persisted. I figured out it’s caused by the default firmware policy when I read a blog article.
In case you are facing same issue. Please go to
-> Servers -> Policies -> Host Firmware Packages -> Click default -> Change it to available version. Modify Package Versions
Some notes for LXC. CentOS 7 minimal version doesn’t support LXC installation by default since LXC is deprecated in version 7. The new container solution is based on docker framework.
There is an alternative to install LXC. Following are procedures:
Install Epel (Extra Packages for Enterprise Linux) repository.
# yum install epel-release
Install some dependencies.
# yum install perl debootstrap libvirt
Now you can install LXC in the epel repository.
# yum install lxc lxc-template
There is an issue been identified in VMware Tools 10.3.0 can result in a PSOD or guest network connectivity loss. VMware has released
KB57796 for that.
I got following error message when I try to run KVM Virtual Machine Manager:
virt-manager on SSH.
Gtk-WARNING **: cannot open display:
There are several things need to be checked:
Now you are ready to use “virt
When you load a PowerShell script you may see following error messages:
Timed out waiting for the PowerShell extension to start
If you see error logs, following appears:
The language service could not be started
One possible reason is your PowerShell executive policy is set to “
AllSigned“. You can find the policy by run PowerShell command below. Get-ExecutionPolicy
Run the following command in an elevated PowerShell window to change the policy.
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned