Small linux, Let's go

Small linux, Letsgo-Linux Enterprise Application-Linux server application information. The following is a detailed description. Suffering from attacks on Linux servers, I have been trying to compress my own proxy servers, so that others can't do anything else, the best advantage is that if the hard disk or system is down, you only need to clone the configuration and then OK,

I .. PPPOE
1. kernel options
CONFIG_PPP = y
CONFIG_PPP_ASYNC = y
CONFIG_PPP_SYNC_TTY = y
CONFIG_PPP_DEFLATE = y
CONFIG_PPP_BSDCOMP = y
CONFIG_PPPOE = y
CONFIG_N_HDLC = y
2./dev Device File
/Dev/ppp file. Creation Method: mknod -- mode = 664/dev/ppp c 108 0
Chmod 600/dev/ppp
3. download the latest PPP software, pppd2.4.2 and then compile
4. download the latest rp-pppoe. The configuration during compilation is as follows:./configure -- enable-plugin = $ PPPDIR
$ The directory of PPPDIR is the directory of the PPP just compiled.
5. Edit the/etc/ppp/pppoe. conf file and add: LINUX_PLUGIN =/etc/ppp/plugins/rp-pppoe.so
6. Then, go to adsl-setup.
7. Description:
A. the pap-secrets file is the user name and password, and the CHAP file is/etc/PPP/chap-secrets.
B./etc/PPP/PPPOE. conf file needs to be changed
8. Files after installation:
/Usr/sbin/PPPOE
/Usr/sbin/PPPOE-server
/Usr/sbin/PPPOE-sniff
/Usr/sbin/PPPOE-relay
/Usr/sbin/adsl-connect
/Usr/sbin/adsl-start
/Usr/sbin/adsl-stop
/Usr/sbin/adsl-setup
/Usr/sbin/adsl-status
II. NETWORK and NETFILTER
1. kernel options
Block devices

Loopback device support

RAM disk support
Networking options

Network Packet filtering (replaces ipchains)
IP: Netfilter configuration (all of the following are compiled to the kernel)
File systems

Compressed ROM file system support

Ext3 journalling file system support
3. Use a file system that can be compressed
1. Package the directory to be compressed: mkcramfs opt. cramfs
2. mount: mount-o loop-t cramfs opt. cramfs/opt
3. Release: cramfsck-x Directory
4. kernel needs:
Block devices

Loopback device support
File systems

Compressed ROM file system support
4. Use RAMDISK
1. Create: mkdir/tmp/RamDisk0
Mke2fs/dev/ram0
Mount/dev/ram0/tmp/RamDisk0
2. kernel options: Block devices --->

RAM disk support
A. The ramdisk size can be changed by passing ramdisk_size = 10000 to the kernel during compilation.
B. When using modules, change the size during loading:/etc/conf. modules
Options rd rd_size = 10000
C. Load when inserting a module: insmod rd rd_size = 10000
5. System Startup
1. Necessary Directories
Install-d {bin, boot, dev/pts, etc/{init. d, network}, proc, lib, mnt}
Install-d {sbin, usr/local, var/{log, run}, opt}
Install-d root-m 0750
Install-d tmp/var/tmp-m 1777
Install-d usr/{bin, include, lib, sbin, share, src}
2. Necessary Device Files
Mknod-m 622 console c 5 1
Mknod-m 666 null c 1 3
Mknod-m 666 zero c 1 5
Mknod-m 666 ptmx c 5 2
Mknod-m 666 tty c 5 0
Mknod-m 666 tty0 c 4 0
Mknod-m 666 tty1 c 4 1
Mknod-m 666 tty2 c 4 2
Mknod-m 666 tty3 c 4 3
Mknod-m 666 tty4 c 4 4
Mknod-m 666 tty5 c 4 5
Mknod-m 666 tty6 c 4 6
Mknod-m 444 random c 1 8
Mknod-m 444 urandom c 1 9
Mknod-m 660 hda B 3 0
Mknod-m 660 hda1 B 3 1
Mknod-m 660 hdb B 3 64
Mknodded-m 660 hdb1 B 3 65
Mknod -- mode = 664/dev/ppp c 108 0
Chmod 600/dev/ppp
Install-d/dev/loop
For I in 0 1 2 3 4 5 6 7;
Do mknod/dev/loop/$ I B 7 $ I
Done
Chown root: tty {console, ptmx, tty}
Chown root: tty?
Chown root: disk {hda, hda1, hdb, hdb1}
MAKEDEV-v mem
MAKEDEV-v kmem
MAKEDEV-v ram


3. Startup File
/Etc/fstab
/Dev/hda1/ext3 rw, defaults 1 1
Proc/proc defaults 0 0
None/dev/pts devpts defaults 0 0
/Etc/inittab
: Sysinit:/etc/init. d/rcS
Tty1: respawn:-/bin/sh
Tty2: askfirst:-/bin/sh
: Ctrlaltdel:/bin/umount-a-r
/Etc/init. d/rcS
#! /Bin/sh
/Bin/mount-
/Bin/mount/dev/hda1/-o remount, rw
PATH = "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"
Klogd
Syslogd
/Etc/nsswitch. conf
Passwd: files
Group: files
Shadow: files
Hosts: files dns
Networks: files
Protocols: files
Services: files
Ethers: files
Rpc: files
/Etc/resolv. conf
Nameserver 202.103.0.117
/Etc/hostname
Gateway
/Etc/hosts
127.0.0.1 localhost
/Etc/protocols
/Etc/services
/Etc/ld. so. conf
/Etc/termcap