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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Chapter 12.
Network Scripts
Using Red Hat Linux, all network communications occur between configured interfaces and physical
networking devices connected to the system. The different types of interfaces that exist are as varied
as the physical devices they support.
The configuration files for network interfaces and the scripts to activate and deactivate them are located
in the /etc/sysconfig/network-scripts/ directory. While the existence of interface files can
differ from system to system, the three different types of files that exist in this directory, interface
configuration files, interface control scripts, and network function files, work together to enable Red
Hat Linux to use various network devices.
This chapter will explore the relationship between these files and how they are used.
12.1. Network Configuration Files
Before we review the interface configuration files themselves, let us itemize the primary configuration
files used by Red Hat Linux to configure networking. Understanding the role these files play in setting
up the network stack can be helpful when customizing your system.
The primary network configuration files are as follows:
• /etc/hosts — The main purpose of this file is to resolve hostnames that cannot be resolved
any other way. It can also be used on resolve hostnames on small networks with no DNS serer.
Regardless of the type of network the computer is on, this file should contain a line specifying the IP
address of the loopback device (127.0.0.1) as localhost.localdomain. For more information
see the hosts man page.
• /etc/resolv.conf — This file specifies the IP addresses of DNS servers and the search domain.
Unless configured to do otherwise, the network initialization scripts populate this file. For more
information on this file see the resolv.conf man page.
• /etc/sysconfig/network — Specifies routing and host information for all network interfaces.
For more information on this file and what directives it accepts, see Section 3.7.1.23.
• /etc/sysconfig/network-scripts/ifcfg-
interface-name — For each network in-
terface on a Red Hat Linux system, there is a corresponding interface configuration script. Each of
these files provide information specific to a particular network interface. See Section 12.2 for more
information on this type of file and what directives it accepts.
Caution
The /etc/sysconfig/networking/ directory is used by the Network Administration Tool
(redhat-config-network) and its contents should not be edited manually. For more information
about configuring network interfaces using the Network Administration Tool, see the chapter
called Network Configuration in the Official Red Hat Linux Customization Guide.
12.2. Interface Configuration Files
Interface configuration files control the operation of individual network interface device. As your
Red Hat Linux system boots, it uses these files to determine what interfaces to bring up and how to
- Red Hat Linux 8.0 1
- The Official Red Hat Linux 1
- Reference Guide 1
- Table of Contents 3
- Introduction 7
- 3. Document Conventions 10
- Mail backupfiles mail reports 12
- 4. Using the Mouse 13
- 6. More to Come 13
- 7. Sign Up for Support 14
- System Reference 15
- Chapter 1 17
- File System Structure 17
- 1.2.1. FHS Organization 18
- /usr/local/sbin." 19
- /usr." 20
- 1.3. Special File Locations 21
- Chapter 2 23
- The proc File System 23
- 2.1.2. Changing Virtual Files 24
- 2.2.1. /proc/apm 24
- 2.2.2. /proc/cmdline 25
- 2.2.3. /proc/cpuinfo 25
- 2.2.4. /proc/devices 26
- 2.2.5. /proc/dma 27
- 2.2.6. /proc/execdomains 27
- 2.2.7. /proc/fb 27
- 2.2.8. /proc/filesystems 27
- 2.2.9. /proc/interrupts 28
- 2.2.10. /proc/iomem 29
- 2.2.11. /proc/ioports 29
- 2.2.12. /proc/isapnp 30
- 2.2.13. /proc/kcore 30
- 2.2.14. /proc/kmsg 31
- 2.2.15. /proc/ksyms 31
- 2.2.16. /proc/loadavg 31
- 2.2.17. /proc/locks 31
- 2.2.18. /proc/mdstat 32
- 2.2.19. /proc/meminfo 32
- 2.2.20. /proc/misc 33
- 2.2.21. /proc/modules 33
- 2.2.22. /proc/mounts 34
- 2.2.23. /proc/mtrr 34
- 2.2.24. /proc/partitions 34
- 2.2.25. /proc/pci 35
- 2.2.26. /proc/slabinfo 36
- 2.2.27. /proc/stat 36
- 2.3. Directories in /proc/ 37
- 2.3.2. /proc/bus/ 39
- 2.3.3. /proc/driver/ 40
- 2.3.4. /proc/fs 40
- 2.3.5. /proc/ide/ 41
- 2.3.6. /proc/irq/ 42
- 2.3.7. /proc/net/ 42
- 2.3.8. /proc/scsi/ 43
- 2.3.9. /proc/sys/ 45
- Section 2.4 46
- 57411 52939 45 0 0 0 47
- 2.3.10. /proc/sysvipc/ 51
- 2.3.11. /proc/tty/ 51
- 2.4. Using sysctl 52
- 2.5. Additional Resources 53
- Chapter 3 55
- 3.2.2. The Boot Loader 56
- 3.2.3. The Kernel 57
- 3.2.4. The /sbin/init Program 57
- Web server 59
- 3.5. SysV Init 60
- 3.6. Init Runlevels 61
- 3.6.1. Initscript Utilities 62
- /etc/sysconfig/ Directory 63
- • vncservers 64
- • xinetd 64
- • USEMD5= 64
- DESKTOP="GNOME" 65
- LANG="en_US" 66
- /dev/raw/raw1 /dev/sda1 71
- /dev/raw/raw2 8 5 71
- • DAEMON= 72
- • CARDTYPE= 72
- • SERVER= 73
- • DEVICE= 73
- 3.8. Shutting Down 75
- Chapter 4 77
- Boot Loaders 77
- 4.3. Installing GRUB 78
- 4.4. GRUB Terminology 79
- 4.5. GRUB Interfaces 80
- 4.6. GRUB Commands 81
- 4.8. LILO 84
- 4.8.2. LILO vs. GRUB 85
- 4.11. Additional Resources 87
- 88 Chapter 4. Boot Loaders 88
- Chapter 5 89
- Users and Groups 89
- 5.3. Standard Groups 91
- 5.4. User Private Groups 92
- /usr/sbin/groupadd emacs 93
- 5.5. Shadow Utilities 94
- Chapter 6 97
- The X Window System 97
- 6.2. XFree86 98
- 6.3.1. Window Managers 102
- 6.3.2. Desktop Environments 102
- 6.4. Runlevels 103
- 6.4.2. Runlevel 5: prefdm 104
- 6.5. Fonts 105
- 6.5.2. Adding Fonts 106
- 6.6. Additional Resources 107
- Security Reference 109
- Chapter 7 111
- 7.3. PAM Modules 112
- 7.4. PAM Module Control Flags 113
- 7.5. PAM Module Paths 114
- 7.6. PAM Module Arguments 114
- 7.8. PAM and Device Ownership 116
- 7.9. Additional Resources 117
- Chapter 8 119
- TCP Wrappers and xinetd 119
- 8.2.1. Formatting Rules 120
- EXCEPT operators 121
- /etc/xinetd.conf 123
- 8.4. Additional Resources 127
- Chapter 9 129
- SSH Protocol 129
- 9.3. Layers of SSH Security 130
- 9.3.1. Transport Layer 131
- 9.3.2. Authentication 131
- 9.3.3. Connection 132
- 9.5. More Than a Secure Shell 133
- 9.5.2. Port Forwarding 134
- 136 Chapter 9. SSH Protocol 136
- Chapter 10 137
- Kerberos 137
- 10.3. Kerberos Terminology 138
- 10.4. How Kerberos Works 139
- 10.5. Kerberos and PAM 140
- 10.8. Additional Resources 142
- 10.8.2. Useful Websites 143
- 144 Chapter 10. Kerberos 144
- Chapter 11 145
- Tripwire 145
- 11.3. Customizing Tripwire 147
- /etc/tripwire/twpol.txt 148
- /usr/sbin/tripwire --init 149
- /etc/hosts, use the 152
- EDITOR line of the 152
- Important 153
- 11.8.1. Tripwire and Email 154
- 11.10.1. Tripwire Components 155
- 11.11. Additional Resources 156
- Network Services Reference 157
- Chapter 12 159
- Network Scripts 159
- 12.2.1. Ethernet Interfaces 160
- 12.2.2. Dialup Interfaces 161
- 12.2.3. Other Interfaces 162
- 12.2.4. Alias and Clone Files 163
- 12.4. Network Functions 164
- 12.5. Additional Resources 165
- Chapter 13 167
- Firewalls and iptables 167
- 13.3.1. Tables 169
- 13.3.2. Structure 170
- 13.3.3. Commands 170
- 13.3.4. Parameters 171
- 13.3.5. Match Options 172
- 13.3.6. Target Options 174
- 13.3.7. Listing Options 175
- 13.5. Additional Resources 176
- Chapter 14 177
- Apache HTTP Server 177
- UserDir disable 181
- UserDir public_html 181
- 14.3. After Installation 187
- /sbin/service httpd start 188
- /sbin/service httpd stop 188
- /sbin/service httpd restart 188
- /sbin/service httpd reload 188
- 14.5.1. ServerRoot 189
- 14.5.2. LockFile 189
- 14.5.10. StartServers 191
- 14.5.11. MaxClients 191
- 14.5.12. MaxRequestsPerChild 191
- 14.5.13. Listen 191
- 14.5.14. Include 191
- 14.5.17. ExtendedStatus 192
- 14.5.18. User 192
- 14.5.15. LoadModule 192
- 14.5.16. IfDefine 192
- 14.5.19. Group 193
- 14.5.20. ServerAdmin 193
- 14.5.21. ServerName 193
- 14.5.22. DocumentRoot 193
- 14.5.23. Directory 193
- 14.5.24. Options 194
- 14.5.25. AllowOverride 194
- 14.5.26. Order 194
- 14.5.27. Allow 195
- 14.5.28. Deny 195
- 14.5.29. UserDir 195
- 14.5.30. DirectoryIndex 195
- 14.5.31. AccessFileName 195
- 14.5.38. ErrorLog 197
- 14.5.39. LogLevel 197
- 14.5.40. LogFormat 197
- 14.5.41. CustomLog 197
- 14.5.42. ServerSignature 198
- 14.5.43. Alias 198
- 14.5.44. ScriptAlias 198
- 14.5.45. Redirect 199
- 14.5.46. IndexOptions 199
- 14.5.47. AddIconByEncoding 199
- 14.5.48. AddIconByType 199
- 14.5.56. AddLanguage 201
- 14.5.57. LanguagePriority 201
- 14.5.58. AddType 201
- 14.5.59. AddHandler 201
- 14.5.60. Action 201
- 14.5.61. MetaDir 202
- 14.5.62. MetaSuffix 202
- 14.5.63. ErrorDocument 202
- 14.5.64. BrowserMatch 202
- 14.5.65. Location 202
- 14.5.66. ProxyRequests 203
- 14.5.67. ProxyVia 203
- 14.5.68. Cache Directives 203
- 14.5.69. NameVirtualHost 203
- 14.5.70. VirtualHost 204
- 14.5.71. SetEnvIf 204
- 14.6. Default Modules 205
- 14.8. Using Virtual Hosts 206
- NameVirtualHost * 207
- 14.9. Additional Resources 208
- Chapter 15 209
- 15.1.3. SMTP 210
- 15.2.1. Mail User Agent 211
- 15.2.2. Mail Transfer Agent 211
- 15.3. Sendmail 212
- /etc/mail/sendmail.cf 214
- 15.4. Fetchmail 216
- 15.5. Procmail 220
- 15.5.2. Procmail Recipes 221
- * ^From: [email protected] 224
- /dev/null 224
- 15.6. Security 225
- 15.7. Additional Resources 226
- 15.7.2. Useful Websites 227
- 15.7.3. Related Books 227
- Chapter 16 229
- 16.2. BIND Configuration Files 230
- 16.2.1. /etc/named.conf 231
- • include " 232
- • view " 233
- • zone " 234
- 16.2.2. Zone Files 235
- 16.3. Using rndc 240
- 16.4.2. Multiple Views 243
- 16.4.3. Security 243
- 16.4.4. IP version 6 243
- 16.6. Additional Resources 244
- 16.6.3. Related Books 245
- Chapter 17 247
- Network File System (NFS) 247
- 17.1.1. NFS and portmap 248
- 17.2.1. /etc/exports 250
- 17.3.1. /etc/fstab 251
- 17.3.2. autofs 252
- 17.4. Securing NFS 253
- 17.5. Additional Resources 254
- 17.5.2. Related Books 255
- Chapter 18 257
- 18.2.1. NSS, PAM, and LDAP 259
- 18.3. LDAP Terminology 260
- 18.4.1. slapd.conf 261
- 18.5. OpenLDAP Setup Overview 262
- /sbin/service/ldap start 263
- 18.8. Additional Resources 265
- 18.8.3. Related Books 266
- Appendixes 267
- Appendix A 269
- A.2. CD-ROM Module Parameters 270
- A.3. SCSI parameters 272
- A.4. Ethernet Parameters 275
- Colophon 293
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