grub2 default entry

Update default entry in grub.

you need to modify

set default="4" in   /boot/grub2/grub.cfg

first check the entries and map it with numbers. first entry is default ="0".
change it according to requirement.

NAT , bridge mode in (libvirt) Virtual machine

http://superuser.com/questions/227505/what-is-the-difference-between-nat-bridged-host-only-networking

Same concept as the normal network setup:)

Host-Only: the VM will be assigned one IP, but it's only accessible by the box VM is running on. No other computers can access it.
IP not received by DHCP .  It is static. You will see another interface in host with same IP range as assigned to guest.

NAT: just like your home network with a wireless router, the VM will be assigned in a separate subnet, like 192.168.6.1 is your host computer, and VM is 192.168.6.3, then your VM can access outside network like your host, but no outside access to your VM directly, it's protected.
IP not received by DHCP.It is static. You will see another interface in host with same IP range as assigned to guest.

Bridge: you VM will be in the same network as your host, if you host IP is 172.16.120.45 and your VM will be like 172.16.120.50. It can be accessed by all computers in your host network.
IP  received by DHCP.

#networking #libvirt

centos and Fedora dual boot issue - Updated grub2

After installing both CENTOS  and Fedora 18, Centos  "disappeared" from Grub menu. Only Fedora 18 is bootable.

Then, able to restore Centos by issuing following commands.

#grub2-mkconfig -o /boot/grub2/grub.cfg

#grub2-install /dev/sda

gdbserver in Board

Assuming you have networking already setup to your target board. Copy gdbserver to it, run:

$ gdbserver --multi :2345

On your development machine, run:

$ arm-linux-gnueabihf-gdb
(gdb) target extended BOARD-IP-ADDR:2345
(gdb) set remote exec-file /bin/true
(gdb) run

and you're up and running with remote cross debugging.

http://stackoverflow.com/questions/13269948/need-cross-gdb-for-device


Both gdbserver and arm-linux-gnuXXXX-gdb are  present in our toolchain.

disable read out aloud sender name when SMS received

You may have driving mode turned on and didn`t realize it. 1) Go into Settings 2) Select Voice Input Output 3) Select Text to Speech 4) Click off Driving Mode. 
Read more: How to stop samsung galaxy s2 reading the text message sender out? - Even when my phone is in silent mode, the phone still reads out the number of the sender. and i have no idea how to turn it off :: Ask Me Fast at http://www.askmefast.com/How_to_stop_samsung_galaxy_s2_reading_the_text_message_sender_out-qna1622993.html#q617165

SMS option from gmail - change from hangout to chat option

From gmail, you should be able to send SMS.

I have noticed in one account, this option is not ENABLED. Here it was in "Hangout option"
If you revert from Hangout option to Chat option, You should be able to see SMS option available.

Also, note, the contact with which you wish to sms, have their mobile number updated in their contact info. Otherwise, OBVIOUSLY you will not see SMS option.

Linux wifi connect to router

iwlist scan
=> it should show the interfaces available.

iwconfig wlan0 essid CiscoEssid
=> associate with a essid

ifconfig wlan0 192.172.1.16 netmask 255.255.255.0 up
=> assign ip address

ping 
=> should be able to communicate 

iperf static build arm cross compile commands

# ./configure ac_cv_func_malloc_0_nonnull=yes  ac_cv_type_bool=yes ac_cv_sizeof_bool=1  CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++ --host=arm  CFLAGS=-static CXXFLAGS=-static

# make

# file src/iperf

Linux kernel preemption

Excellent article on kernel preemption

kernel preemption concepts clearly explained "with code"

http://www.linuxjournal.com/article/5600

• Send to Kindle
• Download ePub
• Print

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yahoo mail retreival from gmail - POP settings

I have configured my gmail to retreive emails from yahoo mail id.
(This helps in a way , you don't have to login to two accounts to check for email
at the same time, maintain two mails for two different purposes.

I was having yahoo mail id for a  long time and when I tried switching back
to gmail, it was painful to broadcast all users about my yahoo mail id.
So, I have configured gmail to retrieve emails from yahoo id automatically
using "Account and Import" in gmail settings.)

I have been happily receiving emails long time since, but all of a sudden
it stopped working.

While looking for the solutions around, I thought of just logging into yahoo
and check the settings.


I have just save relevant settings in Yahoo to enable POP as well as
re-entered password in gmail. Cool...it started working again.

Note, I have not done anything new, just save settings in Yahoo and just
enable the same in gmail. I think its kind of reboot.
These things happen in software world  ;)

PS:
Error  messaege observed in gmail.
Error in RETR command: [SYS/TEMP] problem retrieving message 

Hibernation in Linux 2.6.29 from Varun Mahajan

More linux links  here:
http://www.slideshare.net/varunmahajan06

tamil font chrome + linux (Fedora distribution)

All of  a sudden tamil fonts are not shown properly in chrome.

I tried this step and then it had started working fine.

# cd ~/.fonts/
# mv *.ttf /tmp/

Now reload the page.  Everything should be fine.

PS:
I am not sure about consequence of this in other software used. If you feels so, Please revert back by moving those files back from /tmp to ~/fonts/ back.  # mv /tmp/*.ttf ~/.fonts/