Peter Luk's Blog

A cat lover's weblog

SoundFlower for Mac

A software on Mac which can allow the routing of sound from Software A to Software B. For example, you can route Youtube’s output to Audacity as input.

Broadband Router Modding

Recommended Model for installing DD-WRT

1. NetGear WR3500L : Broadcom BCM4718A(450Mhz) chip, 8MB, flash, 64MB RAM, HK$900

2. ASUS RT-N16: Broadcom BCM4718 (533Mhz) chip, 32MB Flash, 128 MB RAM, HK$899

3. Buffalo WZR-HP-G300NH: Atheros AR91321 (400Mhz) chip, 32MB Flash, 128 MB RAM, HK$700

4. TP-Link WR1043ND: Atheros AR9132 (400MHz) chip, 8MB Flash, 32MB RAM,HK$538

5. D-Link DIR-600: Ralink RT3050 (320Mhz) chip, 4MB Flash, 32MB RAM, HK$199

Upgrade ESXI 4.0 update 2 to ESXi 4.1

Use the VMware host update utility to upgrade the host failed. From instructions from internet, try to upload the unpacked upgrade.zip to the local datastore of the server and run : esxupdate update -m metadata.zip. The upgrade completed without problem on my two ESXI 4 server (One is Dell PE T610, the other is a DIY Core i7 920 with ASUS P6T MB)

HowTo: Migrate / Move MySQL Database And Users To New Server

http://www.cyberciti.biz/tips/move-mysql-users-privileges-grants-from-one-host-to-new-host.html

See this as well : Backup and Restore mysql database

http://www.mydigitallife.info/2007/07/21/how-to-backup-and-restore-export-and-import-mysql-databases-tutorial/

20 Linux System Monitoring Tools Every SysAdmin Should Know

Useful and informative.

http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html

Linux: Subnet (CIDR) Calculator

sipcalc

$ sudo apt-get install sipcalc

$ sipcalc 192.168.1.5/24

Another program is whatmask

wget http://downloads.laffeycomputer.com/current_builds/whatmask/whatmask-1.2.tar.gz

$ whatmask 202.54.1.2/27

------------------------------------------------ TCP/IP NETWORK INFORMATION ------------------------------------------------ IP Entered = ..................: 202.54.1.2 CIDR = ........................: /27 Netmask = .....................: 255.255.255.224 Netmask (hex) = ...............: 0xffffffe0 Wildcard Bits = ...............: 0.0.0.31 ------------------------------------------------ Network Address = .............: 202.54.1.0 Broadcast Address = ...........: 202.54.1.31 Usable IP Addresses = .........: 30 First Usable IP Address = .....: 202.54.1.1 Last Usable IP Address = ......: 202.54.1.30

AD domain controller problem

SYSVOL and NETLOGON shares were not online on the DCs
NETDIAG and DCDIAG tests on the DCs both had major failures, primarily inability to locate any DCs, Global Catalog Servers, time servers, or domain names

All of these problems utlimately tied to an error in the File Replication Service log on the DCs:

Event Type: Warning
Event Source: NtFrs
Event Category: None
Event ID: 13566
Date: 6/10/2010
Time: 9:15:56 PM
User: N/A
Computer: OBIWAN
Description:
File Replication Service is scanning the data in the system volume. Computer OBIWAN cannot become a domain controller until this process is complete. The system volume will then be shared as SYSVOL.

To check for the SYSVOL share, at the command prompt, type:
net share

When File Replication Service completes the scanning process, the SYSVOL share will appear.

The initialization of the system volume can take some time. The time is dependent on the amount of data in the system volume.

Solution :

There is a registry value called BurFlags located in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NtFrs\Parameters\
Backup/Restore\Process at Startup\. The value needs to be set to d4 to allow SYSVOL to be shared out.

Trying of Proxmox VE 1.5

Proxmox VE is position as a bare-metal KVM hypervisor (a customized version of debian). This is not what I want. I am searching for a FREE and versatile KVM management tools running on CentOS 5 to manage a bunch of KVMs used by students. (Something similar to Red hat Enterprise Virtualization Management platform, RHEV-M). However, the management interface (I need user rights management) and sluggish VNC console of it still cannot meet my expectation….Nevertheless, it is the only well integrated and smooth FREE web based management platform for KVM I have tested so far. Waiting for its 2.0 release which the roadmap includes a complete new web interface and user management.