My IT Adventure
I didn’t know ICANN request email address verification, I thought freedom everywhere outside China, but looks like it’s not. 🙂
My domain was suspended due to that ICANN policy, and my QQ mailbox unable to recieve verification email from ICANN, what a unfreedom country it is! Finally I have to change my domain register mailbox to Gmail to get the email.
Shit GFW! ( Check out here to learn more about GFW )
If you have set of group VMs and particular group can access each set VMs, you should grant access on vSphere Client or vSphere Web Client.
SSO is slowly sometimes, you could use following CLI to do it more efficient.
New-VIPermission -Entity “Folder Name” -Principal “Domaingroup name” -Role “Role name”
You could do it faster for regular folder name or group name by excel and notepad:
|
New-VIPermission -Entity “ |
Folder Name |
” -Principal “ |
Domaingroup name |
” -Role “Role name“ |
Guess how to do it. 
Your vHBAs or other PCI devices may stop running in ESXi 5.x when using Interrupt Remapping feature.
This issue only impact to UCS blade BIOS version 1.4(3c), it has been fixed on 1.4(3j).
Please refer to http://kb.vmware.com/kb/1030265 to see how to disable Interrupt Remapping feature in ESXi 5.x
Also refer to https://tools.cisco.com/bugsearch/bug/CSCty96722.
Serials console is very helpful to troubleshooting Linux problem, you can see additional system message via serial console if your Linux server hung. It is essential component on physical server for troubleshooting. It’s challenge to manage serial consoles if your datacenter is very big. You may deploy console server for central management of serial consoles, you don’t have to connect your computer with serial console one by one, you just need connect console server IP follow with port name by telnet protocol.
Time comes to today, virtualization world. How you connect serial console of Linux virtual machine? Can we do exactly same like physical server? Answer is YES! There is couple of way to connect serial console of VM, each way has different benefit. I’m going to introduce the best one!
VMware has a KB article 1022303 introduces how to implement virtual console server, but it’s not very clearly, I went to wrong way by follow up the KB.
Deploy Avocent ACS v6000 virtual advanced console server
1. Download the software image from Emerson website.
2. Install the software on console server VM by follow up ACS v6000 Installer/User Guide.
Configure Linux VM serial console
1. Add a serial port to target Linux VM you want to use serial console.
2. Configure the serial port, Select Use Network option.
3. Select Client (VM initiates connection) option.
4. Input ACSID in Port URI field.
5. Select Use Virtual Serial Console Concentrator option.
6. Input telnet://console server ip:8801 in vSPC URI field.
7. Select Yield CPU on poll option.
8. Make sure Connected and Connect at power on options are selected.
Note: It indicates wrong setting on serial port if Connected option goes back to deselect status automatically after you save the setting.
Enable kernel message on Linux VM
1. Login to your target Linux VM by SSH.
2. Copy following strings to SSH, it will enable kernel message on serial console.
cat <<EOFEOF > /etc/init/serial-ttyS0.conf
# This service maintains a getty on /dev/ttyS0.
start on stopped rc RUNLEVEL=[2345]
stop on starting runlevel [016]
respawn
exec /sbin/agetty /dev/ttyS0 115200 vt100-nav
EOFEOF
3. Run following command.
initctl start serial-ttyS0
Enable serial console on Linux VM
1. Edit grub.conf by following command.
vi /boot/grub/grub.conf
2. Add following lines after hiddenmenu option.
serial –unit=1 –speed=19200
terminal –timeout=8 console serial
3. Add following line in each kernel line.
console=tty0 console=ttyS0,115200
4. Reboot VM.
Configure ASC v6000 console server
1. Login management website of ASC v6000 console server.
2. Go to Ports – Serial Ports.
3. Enable ttyS1 device.
4. Go to Access option, you will see the serial console is automatically mapped to serial console of target Linux VM.
Validation
1. Login serial console of target Linux VM via console server by telnet, SSH or serial viewer.
2. Login SSH of target Linux VM directly.
3. On SSH session, run following command to trigger kernel message.
echo h > /proc/sysrq-trigger
4. You will see message on serial console screen.
My wifi router was purchased one years ago, for some reason it’s not stable now, sometimes lost package when I ping it. After chat with my friends Steven, he recommended Cisco Linksys WRT54G2 which he is using, a very stable router. You can install DD-WRT firmware and leverage more new free feature, such as NFS, firewall, VPN…etc. I’m newbie, I’ll try explore more on my spare time. That’s a used router on120RMB (around $20).
I successfully installed it and turned on internet after 30 minutes, but I cannot log in my VPS by SSH on port 21, then I asked Steven’s VPS SSH to give a try, his port is 443, I cannot connect his also!! I suspected firewall on WRT54G2 maybe blocked the two ports since the router much like a Linux system, you can even run iptables command. Finally I figured out my network provider blocked port 21 and 443, how funny it is that I spend 3 hours to investigated firewall, routing table, wifi setting, NAT…etc. But forgot my sweet network provider!!
大意了，大意了！没想到21和443同时被封了，搞得我以为是路由器设定问题，弄了3个小时！最后把VPS端口号改成8080，上的飕飕的。这让我想起弟弟的iPhone没有电话信号了，他做的第一件事是拿去经销商处修理，由于过年，需要30天才能返回，其实最简单的是去先换张卡看看是不是真的手机有问题。随着经验的积累，我们遇到事情好像也更复杂的看待，其实有时候复杂的搞不定还是可以从简单入手的，尤其是系统排错方面。不知IT项目实施方面是否也如此？
Your HP server may runs fine on ESXi 4.x or 5.0, but you may get error message No NIC found with MAC address xx:xx:xx:xx:xx:xx after upgrade to ESXi 5.1 or later.
That’s caused by network adapter firmware, you have to upgrade server network adapter firmware by HP SPP 2013.02 or later. I would recommend you upgrade firmware of each component to this version, it’s pretty stable to run ESXi 5.1.
NetApp Virtual Storage Console is my favorite to manage and backup data on NetApp attached ESXi host, there is lot of benefits to secure VM data more efficient.
The installation is pretty simple, and very less resource it requires, you can even install it on a multi-role virtual machine. But the first headache maybe the backup log.…
The default report URL is IPv6 in NetApp Virtual Storage Console. You have to add parameter in wrapper.conf file manually. Here is detail steps:
This procedure has to be repeated after NetApp Virtual Storage Console is upgraded.
1) Shut down SMVI server (via Windows service).
2) Open the wrapper.conf in C:Program FilesNetAppVirtual Storage Consolesmviserveretc
3) Locate section
Java Additional Parameters wrapper.java.additional.1=-XX:MaxPermSize=128m wrapper.java.additional.2=-Dcom.sun.management.jmxremote wrapper.java.additional.3=-Dcommon.dir=. wrapper.java.additional.4=-Dorg.apache.cxf.Logger=org.apache.cxf.common.logging.Log4jLogger
4) Add following line:
wrapper.java.additional.5=-Djava.net.preferIPv4Stack=true
5) Start SMVI server (via Windows service).
大约在10年前，我参加过一个CCNA的培训，认识了当时给我们上课的老师——杨佳，那时候他已经是CCIE了。说到CCIE、CCNA，就要先说说Cisco（思科）了。网络是通过路由器、交换机连接在一起的，这个地球上60%以上路由器、交换机是思科制造，可以这么说，思科创造并提供着网络世界。CCIE是思科公司产品专家的最高级别认证，每年只有很少的人可以通过这个考试，因为考试内容几乎全部是上机实战，很少一选择填空，而且是全英文的，一旦拿到CCIE意味着你掌握了非常丰富的网络知识，可以真的称得上网络专家了。我的老师杨佳就是其中一名。
Today, I’m in company shutdown, have few spare time. I read his blog http://www.yangjia.org/, pretty interesting, look at his colorful life, come back to my life. That’s too much different! I admit single life is different with marriaged life, but that’s the life, the freedom I wanna to be! At least, I need some change in my life…
It’s be a while. Provisioning, formatting, and re-provisioning. Compare each Linux distribution, finally I decide to use Debian, since my Raspberry Pi official image also base upon Debian. I also registered this brand new domain to re-start my blog life.
都不知道是第几次Hello world了，这次一定要开始了，先把之前在Wordpres的文章搬过来再说！
On today’s troubleshooting, I faced a very weird problem. vCenter Server services were up and running fine, it’s able to connect by vSphere client, but VMs, hosts show gray, and I cannot power on VM via PowerCLI.
After went through each components of vCenter Server, I noticed the database size was 230GB, but only ~20 hosts were there. So I asked DBA team truncat event tables and shrink database. Issue gone after database optimization.
You may want to do same if you face similar issue.