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APT sources

/etc/apt/sources.list

Order of name resolution

/etc/nsswitch.conf

DNS Hosts File

/etc/hosts

DNS sever Information

/etc/resolv.conf

Kernel module config

/etc/sysctl.conf

Sys calls

/usr/include /i386-linux-gnu/asm/unistd_32.h

OS version info

/etc/issue
/proc/version

Cron

/etc/crontab

Bootloader - GRUB2

Main configuration file (replaces menu.lst in GRUB (v1))

/boot/grub/grub.cfg

Directory contains the scripts that build the grub.cfg

/etc/grub.d
- 00_header - Loads the settings from /etc/default/grub - 05_debian_theme - Defines the colors, background, etc. - 10_linux - Loads the menu entries - 20_memtest86 - Loads the memory tester - 30_os-prober - Scans the hard drives for other operating systems - 40_custom - Template for manually adding other menu entries

File contains the GRUB menu settings

/etc/default/grub

Run update-grub after modifying.

Samba

/etc/samba/smb.conf

Syslog

/etc/rsyslog.conf

Log mail events of all priorities to /var/log/mail.

mail.* /var/log/mail

*.emerg *

Log all events of the emergency priority (emerg) to all logged on users.