Create Bootable USB from Linux

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Install Livecd-tools and spin-kickstarts using Yum
yum install livecd-tools spin-kickstarts

Make the partition bootable
/sbin/parted /dev/sdb
(parted) toggle N boot
(parted) quit

Run the command from shell
/usr/bin/livecd-iso-to-disk /path/to/live.iso /dev/sdb1

Google Repo for Linux

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Add following to /etc/yum.repos.d/google.repo file:
32-bit

[google]
name=Google – i386
baseurl=http://dl.google.com/linux/rpm/stable/i386
enabled=1
gpgcheck=1
gpgkey=https://dl-ssl.google.com/linux/linux_signing_key.pub

Install VNC and Fluxbox

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Reference : http://wiki.centos.org/HowTos/VNC-Server

Install VNC
—————
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
rpm -ivh rpmforge-release-0.3.6-1.el5.rf.i386.rpm
yum install vnc-server.i386

Create your VNC users.
useradd test
passwd test

Set User’s VNC password
Run vncpasswd

Edit Server Configuration
VNCSERVERS=”2:test”
VNCSERVERARGS[2]=”-geometry 800×600″

Restart VNC Server
/etc/init.d/vncserver stop
/etc/init.d/vncserver start

Create xstartup scripts
Login user “test” and edit xstartup script.
vi .vnc/xstartup

xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80×24+10+10 -ls -title “$VNCDESKTOP Desktop” -e ./menu &
amule &
fluxbox &

Install Fluxbox
————–
yum install fluxbox.i386
yum install xorg-x11-xinit.i386

Bootable USB Drive in MAC

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1. Insert your flash drive
2. Open Terminal and run :
diskutil list
3. Note the device node assigned to your flash media
(e.g. /dev/disk1s1)
4. Run :
diskutil unmountDisk /dev/disk1s1
5. Then execute :
sudo dd if=/path/to/downloaded.img of=/dev/disk1s1 bs=1m
6. Finally Run :
diskutil eject /dev/disk1s1
7. Remove your flash drive

Timezone Setup – NTP

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Create a symlink to file localtime:

# ln -sf /usr/share/zoneinfo/EST /etc/localtime

#date

[bash]# chkconfig –level 2345 ntpd on
[bash]# /etc/init.d/ntpd restart

[bash]# chkconfig –list ntpd

To see if the service started successfully, you should check the system log file.

[bash]# grep ntpd /var/log/messages

[bash]# ntpq -pn

For correct synchronization, the delay and offset values should be non-zero and the jitter value should be under 100.

Whitelist domains in exim

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Login to the server SSH as root. Make a sender whitelist file.

touch /etc/exim_whitelist_senders

Take a backup of the exim conf and open it.

cp -p /etc/exim.conf /etc/exim.conf.BKP
vi /etc/exim.conf

Add the line on top of the file

addresslist whitelist_senders = wildlsearch;/etc/exim_whitelist_senders

Now search for the line
require verify = sender/callout

Comment that line and add the following below that.

!verify = sender/callout=30s,defer_ok,maxwait=60s
!senders = +whitelist_senders

Save conf file.

Add email address to the /etc/exim_whitelist_senders file one by one. Wildcard is also acceptable here, Eg: *@domain.com

Restart exim