2011 | Tim K.C. Leung & Sin Y.S. Tin

Disable dmraid support when installing CentOS 6.x

Post Author:Tim
Post published:December 28, 2011
Post Category:生活
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When the Centos installation disk ask for the choice of text mode or graphic mode, use "Tab" to edit and add the following at the end. nodmraid

Norton DNS

Post Author:Tim
Post published:December 19, 2011
Post Category:Networking / 電腦
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198.153.192.1 198.153.194.1

Install VMware Tools in Linux

Post Author:Tim
Post published:December 11, 2011
Post Category:VMware / 電腦
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# yum install gcc gcc-c++ kernel-devel # ln -s /usr/src/kernels/[your kernel version] /usr/src/linux # mkdir /mnt/cdrom # mount /dev/cdrom /mnt/cdrom # cd /mnt/cdrom # cp VMwareTools-[version].tar.gz /tmp # cd /tmp…

Rootkit Hunter installation

Post Author:Tim
Post published:December 3, 2011
Post Category:Linux
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Download From http://sourceforge.net/projects/rkhunter/ Install tar zxvf rkhunter-* cd rkhunter-* ./installer.sh --install cd .. rm -rf rkhunter* Run /usr/local/bin/rkhunter --update to update the database Run /usr/local/bin/rkhunter --propupd to create pre-required MD5…

Enable php feature by .htaccess

Post Author:Tim
Post published:March 24, 2011
Post Category:web programming / 電腦
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You may use .htaccess to enable php feature by php_value output_buffering On However, If the php is not running as Apache modules, 500 errors probably come up. In this case…

Sum the number in each line of a file

Post Author:Tim
Post published:January 31, 2011
Post Category:Linux
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Here is the command awk '{s += $1} END {print s}' mydatafile.txt

Red Hat Enterprise Linux 6.0 Benchmarks By Phoronix

Post Author:Tim
Post published:January 30, 2011
Post Category:Linux
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With Red Hat Enterprise Linux 5.x using the Linux 2.6.18 kernel, EXT3, and GCC 4.1 by default, there's quite a number of areas in Red Hat Enterprise Linux 6.0 where…

網路效能測試工具 – iperf

Post Author:Tim
Post published:January 20, 2011
Post Category:Linux / Networking
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Download and install iperf Start a server by using command: iperf -s Test the bandwidth by using command: iperf -i 10 -m -t 120 -c IP_ADDRESS

Linux Ethernet Bonding – load balancing / active-passive

Post Author:Tim
Post published:January 15, 2011
Post Category:Linux / Networking
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This is a notice in the topic of Linux Ethernet Bonding with two ethernet NIC

The case:
There is a server with two ethernet NIC. They are going to be set as either load balancing or active-passive mode.

For load balancing (round-robin) – mode = 0, this is the default, transmitting packets in order from the first available slave through the last, for load balancing and fault tolerance.
For active-passive – mode = 1, Only one of the bond slaves is used, and the others act as stand-by mode. Once the active one failure, after particular time period (miimon=xxx), the stand-by one will take over and resume the network connection.

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[Linux Raid] mdadm raid 1 resizing partition

Post Author:Tim
Post published:January 15, 2011
Post Category:Linux
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In order to resize the raid file system from small capacity to larger one, we should reset the raid size and file system size to new setting.
Here are two simple case studies to increase and reduce raid size.
Case 1: Increase the size of /dev/md4 from 4GB to 8GB

pre-check the file system
increase the raid capacity
resize file system capacity
pro-check
mount and use

Case 2: Reduce the size of /dev/md4 from 8GB to 6GB

umount the file system
pre-check
reduce the file system capacity
reduce the raid capacity
pro-check
mount and use

Reference: HowToForge

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