Reset root password
1. Stop mysql server
/etc/init.d/mysql stop
2. Start mysql server with safe mode and skip grant tables
#mysqld_safe –skip-grant-table
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Viewing current queue:
postqueue -p

Delete all deferred messages:
postsuper -d ALL deferred

Delete all message from admin@yahoo.com:
postqueue -p | grep admin@yahoo.com | cut -c 0-12 | tr -d [:blank:] |postsuper -d -

Whitelist IP:
Create or edit file: /etc/postfix/rbl_client_exceptions, then add IP that you want to whitelist. For example 98.139.91.0/32, you can write:
98.139.91 OK

Then, run this command:
postmap /etc/postfix/rbl_client_exceptions

Finally, restart postfix:
/etc/init.d/postfix restart

I just want to access my web server from my local address:

iptables -I INPUT -p tcp --dport 80 -s ! 127.0.0.1 -j DROP -m comment --comment "Only for local address"


Specifications:

1. Ubuntu Server 8.10 Intrepid Ibex
2. Dell Poweredge 1650
   SCSI with RAID Controller
   Three SCSI hard disks, 32GB each
   RAID 0, each hard disk has its own array controller
3. dev/sda1 = /grub, /dev/sda2 = / , /dev/sda5 = swap

Problem:

1. After Ubuntu Server installation has finished, server couldn’t boot normally. It stucked forever at BIOS screen, not even reached Grub.
2. I reinstalled it with different RAID type, but the result was null.

Solution:

1. Install Ubuntu Server
2. Boot with Ubuntu Desktop (Live CD)
3. Open Partition editor, select each partition’s flag to be marked the flag as “raid”, and “boot” + “raid” for boot partition.
4. Open terminal, escalate to root, then reinstall Grub.
   #grub
   grub> root (hd0,0)
   grub> setup hd0
   grub> quit
5. Edit menu.lst file, then add “root=/dev/sda5” to your kernel’s argument. I still can’t figure out, how could Grub data in /dev/sda1 to be read at /dev/sda5 partition after I boot it. But that’s the fact.
6. Reboot the system, eject CD. If you are thrown into BusyBox, from that command prompt, try locate the Grub path. Then fix the kernel’s argument in menu.lst file.

Bad english huh? but … whatever….