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How to do DNS lookup using Dig Command

April 16, 2015 by @HKw@! | No Comments | Filed in centos, Debian, Fedora, Linux, Mac OS X, Networking, RedHat, Ubuntu

Dig command is a command line tool use for querying DNS nameservers for information about host addresses, mail exchanges, nameservers, and related information. This tool is available on any Linux (unix) or Mac OS X operating system.

Example of using Dig Command

munkwais-MacBook-Pro:~ munkwai$ dig www.google.com

; <<>> DiG 9.8.3-P1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32350
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com. IN A

;; ANSWER SECTION:
www.google.com. 299 IN A 173.194.126.80
www.google.com. 299 IN A 173.194.126.81
www.google.com. 299 IN A 173.194.126.83
www.google.com. 299 IN A 173.194.126.82
www.google.com. 299 IN A 173.194.126.84

;; Query time: 44 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Apr 16 04:29:00 2015
;; MSG SIZE rcvd: 112

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Supermicro Server – Stuck at System Initialization

April 14, 2015 by @HKw@! | No Comments | Filed in Server Hardware

One of my SuperMicro Server fail to boot up. It stuck at system initialization with a post code “B7”.

IMG_20150414_172643

After i did some research, i found out  the stop code error B7 or B9 are relate to memory module. I tried do test the RAM by one and found out one of the RAM faulty. I proceed to change the RAM and the Server back to normal.

Mac OS X 10.9 – Wi-Fi : No hardware installed

March 16, 2015 by @HKw@! | No Comments | Filed in Mac OS X, MacBook Pro

I have updated My MacBook Pro to Mac OS X Mavericks.  Initially it working fine. After few week, i noticed that the WiFi wouldn’t work. When i clicked the wireless icon, it show the error Wi-Fi : No hardware installed.

Wi-fi No Hardware installed

To solve this problem, i tried to reset the System Management Controller (SMC) by removing the battery. Below are the steps:- Read the rest of this entry »