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LINUX Rute User's Tutorial and Exposition

by: Sheer, Paul

9780130333513

LINUX Rute User's Tutorial and Exposition

by: Sheer, Paul

ISBN 13:
9780130333513
ISBN 10:
0130333514
Edition: 1st
Format: Paperback
Copyright: 10/02/2001
Publisher: Prentice Hall

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Summary

LINUX: Rute Users Tutorial and Expositionis the only Linux sysadmin's guide proven by 50,000+ Web users. It presents in-depth coverage of all aspects of system administration: user management, security, networking, Internet services, packages, config files, shell scripting, and more. It also contains detailed cross-references to LPI and RHCE certification topics, making it invaluable for exam preparation.

Acknowledgments

xxxi

Introduction

1

(4)

What This Book Covers

1

(1)

Read This Next

1

(1)

What Do I Need to Get Started?

1

(1)

More About This Book

2

(1)

I Get Frustrated with UNIX Documentation That I Don't Understand

2

(1)

LPI and RHCE Requirements

2

(1)

Not RedHat: RedHat-like

3

(1)

Updates and Errata

3

(2)

Computing Sub-basics

5

(10)

Binary, Octal, Decimal, and Hexadecimal

5

(2)

Files

7

(1)

Commands

8

(1)

Login and Password Change

9

(1)

Listing Files

10

(1)

Command-Line Editing Keys

10

(1)

Console Keys

11

(1)

Creating Files

12

(1)

Allowable Characters for File Names

12

(1)

Directories

12

(3)

PC Hardware

15

(10)

Motherboard

15

(4)

Master/Slave IDE

19

(1)

CMOS

20

(1)

Serial Devices

20

(3)

Modems

23

(2)

Basic Commands

25

(24)

The ls Command, Hidden Files, Command-Line Options

25

(1)

Error Messages

26

(3)

Wildcards, Names, Extensions, and glob Expressions

29

(4)

File naming

29

(3)

Glob expressions

32

(1)

Usage Summaries and the Copy Command

33

(1)

Directory Manipulation

34

(1)

Relative vs. Absolute Pathnames

34

(1)

System Manual Pages

35

(1)

System info Pages

36

(1)

Some Basic Commands

36

(4)

The mc File Manager

40

(1)

Multimedia Commands for Fun

40

(1)

Terminating Commands

41

(1)

Compressed Files

41

(1)

Searching for Files

42

(1)

Searching Within Files

43

(1)

Copying to MS-DOS and Windows Formatted Floppy Disks

44

(1)

Archives and Backups

45

(1)

The PATH Where Commands Are Searched For

46

(1)

The -- Option

47

(2)

Regular Expressions

49

(4)

Overview

49

(2)

The fgrep Command

51

(1)

Regular Expression \ { \ } Notation

51

(1)

+ ? \ < \ > ( ) | Notation

52

(1)

Regular Expression Subexpressions

52

(1)

Editing Text Files

53

(8)

vi

53

(4)

Syntax Highlighting

57

(1)

Editors

57

(4)

Cooledit

58

(1)

vi and vim

58

(1)

Emacs

59

(1)

Other editors

59

(2)

Shell Scripting

61

(12)

Introduction

61

(1)

Looping: the while and until Statements

62

(1)

Looping: the for Statement

63

(2)

breaking Out of Loops and continueing

65

(1)

Looping Over Glob Expressions

66

(1)

The case Statement

66

(1)

Using Functions: the function Keyword

67

(1)

Properly Processing Command-Line Args: shift

68

(2)

More on Command-Line Arguments: $ @ and $ 0

70

(1)

Single Forward Quote Notation

70

(1)

Double-Quote Notation

70

(1)

Backward-Quote Substitution

71

(2)

Streams and sed---The Stream Editor

73

(8)

Introduction

73

(1)

Tutorial

74

(1)

Piping Using | Notation

74

(1)

A Complex Piping Example

75

(1)

Redirecting Streams with >

75

(2)

Using sed to Edit Streams

77

(1)

Regular Expression Subexpressions

77

(2)

Inserting and Deleting Lines

79

(2)

Processes, Environment Variables

81

(16)

Introduction

81

(1)

ps---List Running Processes

82

(1)

Controlling Jobs

82

(1)

Creating Background Processes

83

(1)

killing a Process, Sending Signals

84

(2)

List of Common Signals

86

(1)

Niceness of Processes, Scheduling Priority

87

(1)

Process CPU/Memory Consumption, top

88

(2)

Environments of Processes

90

(7)

Mail

97

(4)

Sending and Reading Mail

99

(1)

The SMTP Protocol---Sending Mail Raw to Port 25

99

(2)

User Accounts and Ownerships

101

(10)

File Ownerships

101

(1)

The Password File/etc/passwd

102

(1)

Shadow Password File:/etc/shadow

103

(1)

The groups Command and/etc/group

104

(1)

Manually Creating a User Account

105

(1)

Automatically: useradd and groupadd

106

(1)

User Logins

106

(5)

The login command

106

(1)

The set user, su command

107

(1)

The who, w, and users commands to see who is logged in

108

(1)

The id command and effective UID

109

(1)

User limits

109

(2)

Using Internet Services

111

(6)

ssh, not telnet or rlogin

111

(1)

rcp and scp

112

(1)

rsh

112

(1)

FTP

113

(1)

finger

114

(1)

Sending Files by Email

114

(3)

uuencode and uudecode

114

(1)

MIME encapsulation

115

(2)

Linux Resources

117

(6)

FTP Sites and the sunsite Mirror

117

(1)

HTTP---Web Sites

118

(1)

SourceForge

119

(1)

Mailing Lists

119

(1)

Majordomo and Listserv

119

(1)

*-request

120

(1)

Newsgroups

120

(1)

RFCs

121

(2)

Permission and Modification Times

123

(4)

The chmod Command

123

(2)

The umask Command

125

(1)

Modification Times: stat

126

(1)

Symbolic and Hard Links

127

(4)

Soft Links

127

(2)

Hard Links

129

(2)

Pre-installed Documentation

131

(4)

Overview of the Unix Directory Layout

135

(6)

Packages

135

(1)

UNIX Directory Superstructure

136

(2)

Linux on a Single Floppy Disk

138

(3)

UNIX Devices

141

(12)

Device Files

141

(1)

Block and Character Devices

142

(1)

Major and Minor Device Numbers

143

(1)

Common Device Names

143

(4)

dd, tar, and Tricks with Block Devices

147

(3)

Creating boot disks from boot images

147

(1)

Erasing disks

147

(1)

Identifying data on raw disks

148

(1)

Duplicating a disk

148

(1)

Backing up to floppies

149

(1)

Tape backups

149

(1)

Hiding program output, creating blocks of zeros

149

(1)

Creating Devices with mknod and/dev/MAKEDEV

150

(3)

Partitions, File Systems, Formatting, Mounting

153

(18)

The Physical Disk Structure

153

(2)

Cylinders, heads, and sectors

153

(1)

Large Block Addressing

154

(1)

Extended partitions

154

(1)

Partitioning a New Disk

155

(5)

Formatting Devices

160

(3)

File systems

160

(1)

mke2fs

160

(1)

Formatting floppies and removable drives

161

(1)

Creating MS-DOS floppies

162

(1)

mkswap, swapon, and swapoff

162

(1)

Device Mounting

163

(2)

Mounting CD-ROMs

163

(1)

Mounting floppy disks

164

(1)

Mounting Windows and NT partitions

164

(1)

File System Repair: fsck

165

(1)

File System Errors on Boot

165

(1)

Automatic Mounts: fstab

166

(1)

Manually Mounting/proc

167

(1)

RAM and Loopback Devices

167

(1)

Formatting a floppy inside a file

167

(1)

CD-ROM files

168

(1)

Remounting

168

(1)

Disk sync

169

(2)

Advanced Shell Scripting

171

(22)

Lists of Commands

171

(1)

Special Parameters: $ ?, $ *

172

(1)

Expansion

173

(2)

Built-in Commands

175

(1)

Trapping Signals---the trap Command

176

(1)

Internal Settings---the set Command

177

(1)

Useful Scripts and Commands

178

(8)

chroot

178

(1)

if conditionals

179

(1)

pat ching and diffing

179

(1)

Internet connectivity test

180

(1)

Recursive grep (search)

180

(1)

Recursive search and replace

181

(1)

cut and awk---manipulating text file fields

182

(1)

Calculations with bc

183

(1)

Conversion of graphics formats of many files

183

(1)

Securely erasing files

184

(1)

Persistent background processes

184

(1)

Processing the process list

185

(1)

Shell Initialization

186

(1)

Customizing the PATH and LD_LIBRARY_PATH

187

(1)

File Locking

187

(6)

Locking a mailbox file

188

(2)

Locking over NFS

190

(1)

Directory versus file locking

190

(1)

Locking inside C programs

191

(2)

System Services and 1pd

193

(14)

Using 1pr

193

(1)

Downloading and Installing

194

(1)

LPRng vs. Legacy 1pr-0.nn

195

(1)

Package Elements

195

(4)

Documentation files

195

(1)

Web pages, mailing lists, and download points

195

(1)

User programs

196

(1)

Daemon and administrator programs

196

(1)

Configuration files

196

(1)

Service initialization files

196

(1)

Spool files

197

(1)

Log files

198

(1)

Log file rotation

198

(1)

Environment variables

199

(1)

The print cap File in Detail

199

(1)

PostScript and the Print Filter

200

(2)

Access Control

202

(1)

Printing Troubleshooting

203

(1)

Useful Programs

204

(1)

printtool

204

(1)

apsfilter

204

(1)

mpage

204

(1)

psutils

204

(1)

Printing to Things Besides Printers

205

(2)

Trivial Introduction to C

207

(26)

C Fundamentals

208

(15)

The simplest C program

208

(1)

Variables and types

209

(1)

Functions

210

(1)

for, while, if, and switch statements

211

(2)

Strings, arrays, and memory allocation

213

(2)

String operations

215

(2)

File operations

217

(1)

Reading command-line arguments inside C programs

218

(1)

A more complicated example

218

(2)

# include statements and prototypes

220

(1)

C comments

221

(1)

# define and # if---C macros

222

(1)

Debugging with gdb and strace

223

(4)

gdb

223

(4)

Examining core files

227

(1)

strace

227

(1)

C Libraries

227

(3)

C Projects---Makefiles

230

(3)

Completing our example Makefile

231

(1)

Putting it all together

231

(2)

Shared Libraries

233

(4)

Creating DLL .so Files

233

(1)

DLL Versioning

234

(1)

Installing DLL .so Files

235

(2)

Source and Binary Packages

237

(10)

Building GNU Source Packages

237

(3)

RedHat and Debian Binary Packages

240

(6)

Package versioning

240

(1)

Installing, upgrading, and deleting

240

(1)

Dependencies

241

(1)

Package queries

241

(1)

File lists and file queries

242

(1)

Package verification

243

(1)

Special queries

244

(1)

dpkg/apt versus rpm

245

(1)

Source Packages

246

(1)

Introduction to IP

247

(16)

Internet Communication

247

(2)

Special IP Addresses

249

(1)

Network Masks and Addresses

250

(1)

Computers on a LAN

250

(1)

Configuring Interfaces

251

(1)

Configuring Routing

252

(2)

Configuring Startup Scripts

254

(2)

RedHat networking scripts

254

(1)

Debian networking scripts

255

(1)

Complex Routing---a Many-Hop Example

256

(3)

Interface Aliasing---Many IPs on One Physical Card

259

(1)

Diagnostic Utilities

260

(3)

ping

260

(1)

traceroute

261

(1)

t cpdump

261

(2)

TCP and UDP

263

(10)

The TCP Header

264

(1)

A Sample TCP Session

265

(3)

User Datagram Protocol (UDP)

268

(1)

/etc/services File

269

(1)

Encrypting and Forwarding TCP

270

(3)

DNS and Name Resolution

273

(12)

Top-Level Domains (TLDs)

273

(1)

Resolving DNS Names to IP Addresses

274

(3)

The Internet DNS infrastructure

275

(1)

The name resolution process

276

(1)

Configuring Your Local Machine

277

(4)

Reverse Lookups

281

(1)

Authoritative for a Domain

281

(1)

The host, ping, and whois Command

281

(1)

The nslookup Command

282

(2)

NS, MX, PTR, A and CNAME records

283

(1)

The dig Command

284

(1)

Network File System, NFS

285

(6)

Software

285

(1)

Configuration Example

286

(2)

Access Permissions

288

(1)

Security

289

(1)

Kernel NFS

289

(2)

Services Running Under inetd

291

(8)

The inetd Package

291

(1)

Invoking Services with/etc/inetd.conf

291

(3)

Invoking a standalone service

292

(1)

Invoking an inetd service

292

(1)

Invoking an inetd ``TCP wrapper'' service

293

(1)

Distribution conventions

294

(1)

Various Service Explanations

294

(1)

The xinetd Alternative

295

(1)

Configuration Files

295

(2)

Limiting access

296

(1)

Security

297

(2)

exim and sendmail

299

(18)

Introduction

299

(2)

How mail works

299

(2)

Configuring a POP/IMAP server

301

(1)

Why exim?

301

(1)

exim Package Contents

301

(1)

exim Configuration File

302

(4)

Global settings

303

(1)

Transports

304

(1)

Directors

305

(1)

Routers

306

(1)

Full-blown Mail server

306

(2)

Shell Commands for exim Administration

308

(1)

The Queue

309

(1)

/etc/aliases for Equivalent Addresses

310

(1)

Real-Time Blocking List---Combating Spam

311

(3)

What is spam?

311

(1)

Basic spam prevention

312

(1)

Real-time blocking list

313

(1)

Mail administrator and user responsibilities

313

(1)

Sendmail

314

(3)

lilo, initrd, and Booting

317

(8)

Usage

317

(1)

Theory

318

(1)

Kernel boot sequence

318

(1)

Master boot record

318

(1)

Booting partitions

318

(1)

Limitations

319

(1)

lilo.conf and the lilo Command

319

(2)

Creating Boot Floppy Disks

321

(1)

SCSI Installation Complications and initrd

322

(1)

Creating an initrd Image

322

(2)

Modifying lilo.conf for initrd

324

(1)

Using mkinitrd

324

(1)

init, ?getty, and UNIX Run Levels

325

(8)

init---the First Process

325

(1)

/etc/inittab

326

(2)

Minimal configuration

326

(2)

Rereading inittab

328

(1)

The respawning too fast error

328

(1)

Useful Run Levels

328

(1)

getty Invocation

329

(1)

Bootup Summary

329

(1)

Incoming Faxes and Modem Logins

330

(3)

mgetty with character terminals

330

(1)

mgetty log files

330

(1)

mgetty with modems

330

(1)

mgetty receiving faxes

331

(2)

Sending Faxes

333

(4)

Fax Through Printing

333

(2)

Setgid Wrapper Binary

335

(2)

uucp and uux

337

(10)

Command-Line Operation

338

(1)

Configuration

338

(3)

Modem Dial

341

(1)

tty/UUCP Lock Files

342

(1)

Debugging uucp

343

(1)

Using uux with exim

343

(3)

Scheduling Dialouts

346

(1)

The Linux File System Standard

347

(42)

Introduction

349

(1)

Purpose

349

(1)

Conventions

349

(1)

The Filesystem

349

(2)

The Root Filesystem

351

(11)

Purpose

351

(1)

Requirements

352

(1)

Specific Options

352

(1)

/bin: Essential user command binaries (for use by all users)

353

(1)

/boot: Static files of the boot loader

354

(1)

/dev: Device files

355

(1)

/etc: Host-specific system configuration

355

(3)

/home: User home directories-(optional)

358

(1)

/lib: Essential shared libraries and kernel modules

358

(1)

/lib<qual>: Alternate format essential shared libraries (optional)

359

(1)

/mnt: Mount point for a temporarily mounted filesystem

359

(1)

/opt: Add-on application software packages

360

(1)

/root: Home directory for the root user (optional)

361

(1)

/sbin: System binaries

361

(1)

/tmp: Temporary files

362

(1)

The /usr Hierarchy

362

(11)

Purpose

362

(1)

Requirements

363

(1)

Specific Options

363

(1)

/usr/X11R6: X Window System, Version 11 Release 6 (optional)

363

(1)

/usr/bin: Most user commands

364

(1)

/usr/include: Directory for standard include files

365

(1)

/usr/lib: Libraries for programming and packages

365

(1)

/usr/lib<qual>: Alternate format libraries (optional)

366

(1)

/usr/local: Local hierarchy

366

(1)

/usr/sbin: Non-essential standard system binaries

367

(1)

/usr/share: Architecture-independent data

367

(6)

/usr/src: Source code (optional)

373

(1)

The/var Hierarchy

373

(9)

Purpose

373

(1)

Requirements

373

(1)

Specific Options

374

(1)

/var/account: Process accounting logs (optional)

374

(1)

/var/cache: Application cache data

374

(2)

/var/crash: System crash dumps (optional)

376

(1)

/var/games: Variable game data (optional)

376

(1)

/var/lib: Variable state information

377

(2)

/var/lock: Lock files

379

(1)

/var/log: Log files and directories

379

(1)

/var/mail: User mailbox files (optional)

379

(1)

/var/opt: Variable data for/opt

380

(1)

/var/run: Run-time variable data

380

(1)

/var/spool: Application spool data

381

(1)

/var/tmp: Temporary files preserved between system reboots

382

(1)

/var/yp: Network Information Service (NIS) database files (optional)

382

(1)

Operating System Specific Annex

382

(4)

Linux

382

(4)

Appendix

386

(3)

The FHS mailing list

386

(1)

Background of the FHS

386

(1)

General Guidelines

386

(1)

Scope

386

(1)

Acknowledgments

387

(1)

Contributors

387

(2)

httpd---Apache Web Server

389

(20)

Web Server Basics

389

(4)

Installing and Configuring Apache

393

(16)

Sample httpd.conf

393

(1)

Common directives

394

(4)

User HTML directories

398

(1)

Aliasing

398

(1)

Fancy indexes

399

(1)

Encoding and language negotiation

399

(1)

Server-side includes---SSI

400

(1)

CGI---Common Gateway Interface

401

(2)

Forms and CGI

403

(2)

Setuid CGIs

405

(1)

Apache modules and PHP

406

(1)

Virtual hosts

407

(2)

crond and atd

409

(4)

/etc/crontab Configuration File

409

(2)

The at Command

411

(1)

Other cron Packages

412

(1)

postgres SQL Server

413

(12)

Structured Query Language

413

(1)

postgres

414

(1)

postgres Package Content

414

(1)

Installing and Initializing postgres

415

(2)

Database Queries with psql

417

(1)

Introduction to SQL

418

(5)

Creating tables

418

(1)

Listing a table

419

(1)

Adding a Column

420

(1)

Deleting (dropping) a column

420

(1)

Deleting (dropping) a table

420

(1)

Inserting rows, ``object relational''

420

(1)

Locating rows

421

(1)

Listing selected columns, and the oid column

421

(1)

Creating tables from other tables

421

(1)

Deleting rows

421

(1)

Searches

422

(1)

Migrating from another database; dumping and restoring tables as plain text

422

(1)

Dumping an entire database

423

(1)

More advanced searches

423

(1)

Real Database Projects

423

(2)

smbd---Samba NT Server

425

(12)

Samba: An Introduction

425

(6)

Christopher R. Hertel

Configuring Samba

431

(2)

Configuring Windows

433

(1)

Configuring a Windows Printer

434

(1)

Configuring swat

434

(1)

Windows NT Caveats

435

(2)

named---Domain Name Server

437

(16)

Documentation

438

(1)

Configuring bind

438

(10)

Example configuration

438

(5)

Starting the name server

443

(1)

Configuration in detail

444

(4)

Round-Robin Load-Sharing

448

(1)

Configuring named for Dialup Use

449

(1)

Example caching name server

449

(1)

Dynamic IP addresses

450

(1)

Secondary or Slave DNS Servers

450

(3)

Point-to-Point Protocol---Dialup Networking

453

(10)

Basic Dialup

453

(5)

Determining your chat script

455

(1)

CHAP and PAP

456

(1)

Running pppd

456

(2)

Demand-Dial, Masquerading

458

(2)

Dialup DNS

460

(1)

Dial-in Servers

460

(2)

Using t cpdump

462

(1)

ISDN Instead of Modems

462

(1)

The Linux Kernel Source, Modules, and Hardware Support

463

(22)

Kernel Constitution

463

(1)

Kernel Version Numbers

464

(1)

Modules, insmod Command, and Siblings

464

(2)

Interrupts, I/O Ports, and DMA Channels

466

(1)

Module Options and Device Configuration

467

(3)

Five ways to pass options to a module

467

(2)

Module documentation sources

469

(1)

Configuring Various Devices

470

(10)

Sound and pnpdump

470

(2)

Parallel port

472

(1)

NIC---Ethernet, PCI, and old ISA

472

(2)

PCI vendor ID and device ID

474

(1)

PCI and sound

474

(1)

Commercial sound drivers

474

(1)

The ALSA sound project

475

(1)

Multiple Ethernet cards

475

(1)

SCSI disks

475

(2)

SCSI termination and cooling

477

(1)

CD writers

477

(2)

Serial devices

479

(1)

Modem Cards

480

(1)

More on LILO: Options

481

(1)

Building the Kernel

481

(2)

Unpacking and patching

481

(1)

Configuring

482

(1)

Using Packaged Kernel Source

483

(1)

Building, Installing

483

(2)

The X Window System

485

(26)

The X Protocol

485

(6)

Widget Libraries and Desktops

491

(2)

Background

491

(1)

Qt

492

(1)

Gtk

492

(1)

GNUStep

493

(1)

XFree86

493

(4)

Running X and key conventions

493

(1)

Running X utilities

494

(1)

Running two X sessions

495

(1)

Running a window manager

495

(1)

X access control and remote display

496

(1)

X selections, cutting, and pasting

497

(1)

The X Distribution

497

(1)

X Documentation

497

(2)

Programming

498

(1)

Configuration documentation

498

(1)

XFree86 web site

498

(1)

X Configuration

499

(5)

Simple 16-color X server

499

(1)

Plug-and-Play operation

500

(1)

Proper X configuration

501

(3)

Visuals

504

(1)

The startx and xinit Commands

505

(1)

Login Screen

506

(1)

X Font Naming Conventions

506

(2)

Font Configuration

508

(1)

The Font Server

509

(2)

Unix Security

511

(14)

Common Attacks

511

(5)

Buffer overflow attacks

512

(1)

Setuid programs

513

(1)

Network client programs

514

(1)

/tmp file vulnerability

514

(1)

Permission problems

514

(1)

Environment variables

515

(1)

Password sniffing

515

(1)

Password cracking

515

(1)

Denial of service attacks

515

(1)

Other Types of Attack

516

(1)

Counter Measures

516

(7)

Removing known risks: outdated packages

516

(1)

Removing known risks: compromised packages

517

(1)

Removing known risks: permissions

517

(1)

Password management

517

(1)

Disabling inherently insecure services

517

(1)

Removing potential risks: network

518

(1)

Removing potential risks: setuid programs

519

(1)

Making life difficult

520

(1)

Custom security paradigms

521

(1)

Proactive cunning

522

(1)

Important Reading

523

(1)

Security Quick-Quiz

523

(1)

Security Auditing

524

(1)

A Lecture Schedule

525

(6)

Hardware Requirements

525

(1)

Student Selection

525

(1)

Lecture Style

526

(5)

B LPI Certification Cross-Reference

531

(12)

Exam Details for 101

531

(5)

Exam Details for 102

536

(7)

C RHCE Certification Cross-Reference

543

(8)

RH020, RH030, RH033, RH120, RH130, and RH133

543

(1)

RH300

544

(3)

RH220 (RH253 Part 1)

547

(2)

RH250 (RH253 Part 2)

549

(2)

D Linux Advocacy FAQ

551

(22)

Linux Overview

551

(5)

Linux, GNU, and Licensing

556

(4)

Linux Distributions

560

(3)

Linux Support

563

(1)

Linux Compared to Other Systems

563

(4)

Migrating to Linux

567

(2)

Technical

569

(4)

E The GNU General Public License Version 2

573

(8)

Index

581

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