My IT Adventure
使用vSphere Client登录vCenter Server 6.0时可能会出现如下报错信息：
Login to the query service failed.
The server could not interpret the communication from the client. (The remote server returned an error: (500) Internal Server Error.)
这是因为在登录vSphere Client时勾选了”Use Windows session credentials“。试试取消它。
相关知识库链接：Searching the Inventory with the vSphere Client fails (2143566)
You may see following problem if you login vCenter Server 6.0 by vSphere Client:
Login to the query service failed.
The server could not interpret the communication from the client. (The remote server returned an error: (500) Internal Server Error.)
That’s because “Use Windows session credentials” checkbox is selected. Deselect it and give it a try.
Refer KB Searching the Inventory with the vSphere Client fails (2143566)
Just a quick post. When virtual machine cannot get DHCP IP address the first thing you want to check is firewall. Whatever Windows firewall or physical firewall. You should make sure UDP port 67 and 68 are not blocked. Otherwise you will see the virtual machine gets 169.x.x.x IP address only.
The two ports is required for DHCP client to query IP addresses. The methodology is introduced in RFC document.
DHCP uses UDP as its transport protocol. DHCP messages from a client
to a server are sent to the ‘DHCP server’ port (67), and DHCP
messages from a server to a client are sent to the ‘DHCP client’ port
(68). A server with multiple network address (e.g., a multi-homed
host) MAY use any of its network addresses in outgoing DHCP messages.
I also got some ideas in this post.
You may see ‘Adobe Flash Player Out of Date’ on Chrome when you open vSphere Web Client. Click the text Chrome will update Flash Player automatically. But in some cases it doesn’t work due to maybe your Chrome is controlled by company policy or internet problem to Adobe.com. I found an article to show how to offline fix the issue. You can download Flash Player for Opera and Chromium-based browsers – PPAPI in official Adobe KB article.
You may also want to check out my other articles about Flash issue on browsers.
Flash menu appears when right click on vSphere Web Client in Chrome
Slight network latency may cause application problem on sensitive virtual machines. Even the network responding time is just 3 or 7 ms. There is a way to improve the stability of responding latency – Enable RSS on NIC.
Network traffic is handled by single CPU core when RSS is disabled. Enable it will distribute the workload to 4 cores by default. You can increase CPU for RSS by change registry.
To summarize the solution. Go to Device Manager -> NIC properties -> Advance -> Find RSS option and enable it. You will see 2 – 3 network drops when applying it.
You can refer following articles for detail.
Poor network performance or high network latency on Windows virtual machines
Virtual Receive-side Scaling in Windows Server 2012 R2
Regarding increase CPU for RSS. Read following article to learn how to modify it.
If your company implemented firewall and blocked public NTP server, you may see installation of vRealize Operation Manager pending on ./install.sh on console. That’s because the installer tries to negotiate with NTP server www.iana.org. The firewall blocked the traffic.
VMware TAM Manager Shan told me there are two options on firewall to block traffic: REJECT and DROP. REJECT means firewall responding to the request and let source device knows it’s rejected. DROP means firewall immediately ignores the request and no responding to source device. Looks like there is a bug in vROPs code that it hung if NTP request gets drop and no responding.
The workaround is create a port group without physical uplinks and install vRealize Operation Manager. Then move it to proper network after installation is completed. You can configure correct IP addresses when import the OVF file so later on you just need simply move the network.
The smartd service can leads to ESXi 6.0 or 6.5 hosts no responding due to out of memory. I see that issue on ESXi 6.0 U2 and U3 both. I would recommend stay on ESXi 5.5 U3 at this moment.
We do see the issue persist even after stop smartd service.
Check out VMware official KB.
Just noticed a gap here. If your ESXi host is 5.5 Update 2 or earlier version, you are not able to choose ‘Windows Server 2016’ as operating system when you create virtual machine. It’s addressed in KB https://kb.vmware.com/kb/2132789.
There is a KB describes how to fix right click issue in IE on vSphere Web Client. But my problem was in Chrome. I searched a lot in internet but no lucky till today.
The problem was flash menu appears when I right click anything in vSphere Web Client in Chrome. I have two computers that both has Chrome installed but one has issue, other one works fine. I compared version of Chrome, noticed working one was 55.x, problematic one was 49.x. The issue gone after upgraded to 57.x.
After dig into that problem, looks like Google fixed the problem on version 54.0.2840 that there was a bug related to right click. Check out release notes here.
I own Raspberry Pi 1 and 2 both. I used to do some small projects and learn Python on its. It’s great computer to learn scripting and Linux. But not something can be used in daily based.
I was excited when I hear Raspberry Pi foundation released Pi 3. Thanks foundation brought our world a powerful, cheap and flexible computer that can replace my laptop. In general, I think Pi 3 can be used for daily work in GUI interface. It comes with embedded WiFi, Bluetooth and quad-core 1.2GHz CPU! It frees up the 4 USB ports so I can use it for other purpose.
I have a laptop that motherboard was dead, screen still works. So I bought driver board for the LED screen. Connected Pi 3 to the driver board by HDMI cable. The official Pi 2 case is compatible with Pi 3 except power LED in the other side. I use the latest OS “RASPBIAN JESSIE WITH PIXEL“. I have to say the graphical interface is awesome! It’s more like a modern, real computer. I use default browser Chromium which is similar with Chrome PC version. I also installed “Google Input Tool” extension on Chromium so I can input Chinese. Since most of my work on websites so I don’t have to install input tool on OS. And I saw some interface problem when use Chinese input tool for Linux. I also tried bluetooth headset, not working well. So I turned to USB headset, it works perfectly.
I opened 10 more tabs in Chromium just like how do I use my PC. I also ran a online website to streaming music to USB headset. Wrote blog, brows photos, edit files…etc. I didn’t see any performance issue so far. I guess my high performance TF card may helped. I bought Samsung 64GB UHS-1 Class10 for my Pi 3.
