Overview

With User Mode Linux you can create virtual Linux machines within a Linux computer and use them to safely test and debug applications, network services, and even kernels. You can try out new distributions, experiment with buggy software, and even test security. Now, for the first time, the creator and maintainer of User Mode Linux shows how to put it to work hands-on. Jeff Dike covers everything from getting started through running enterprise-class User Mode Linux servers. You'll find authoritative advice on ...

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User Mode Linux

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Overview

With User Mode Linux you can create virtual Linux machines within a Linux computer and use them to safely test and debug applications, network services, and even kernels. You can try out new distributions, experiment with buggy software, and even test security. Now, for the first time, the creator and maintainer of User Mode Linux shows how to put it to work hands-on. Jeff Dike covers everything from getting started through running enterprise-class User Mode Linux servers. You'll find authoritative advice on bootup, compilation, administration, specialized configurations, and much more.

Coverage includes

  • What User Mode Linux is, how it works, and its uses in Linux networks
  • Key applications, including server consolidation, development, and disaster recovery
  • Booting and exploration: logins, consoles, swap space, partitioned disks, and more
  • Copy-On-Write (COW): UML's efficient approach to storing filesystem changes
  • In-depth discussion of User Mode Linux networking and security
  • Centrally managing User Mode Linux instances, and controlling their hardware resources
  • Implementing clusters and other specialized configurations
  • Setting up User Mode Linux servers, step-by-step: small-scale and large-scale examples
  • The future of virtualization and User Mode Linux

Whether you're a netadmin, sysadmin, teacher, student, or programmer, User Mode Linux® --the technology and this book--is indispensable.



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Product Details

  • ISBN-13: 9780132704595
  • Publisher: Pearson Education
  • Publication date: 4/26/2006
  • Sold by: Barnes & Noble
  • Format: eBook
  • Edition number: 1
  • Pages: 352
  • File size: 11 MB
  • Note: This product may take a few minutes to download.

Meet the Author

Jeff Dike, an engineer at Intel, is author and maintainer of User Mode Linux. Well known throughout the Linux technical community, he has been active in Linux kernel development for more than five years. He holds a degree in Computer Science and Engineering from MIT.



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Read an Excerpt

When I started the User Mode Linux (UML) project in 1999, I had no idea how large a project it would become or how much of my time it would end up consuming. As time went on, the UML user base grew, and people found new ways to use it. As a result of their requests, UML contains a number of features that would never have occurred to me.

This book concentrates on the use of UML rather than its internals or plans for the future. I've tried to make it as easy as possible to get started with UML and put to good use all of the features my users induced me to add. Of course, I couldn't resist going into how UML works and what I have planned for its future. That would be too much to ask of any developer of any project. I hope this content adds to the book and the readers' understanding and appreciation of UML.



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Table of Contents

Preface ix
Acknowledgments xi
About the Author xiii
Chapter 1: Introduction 1

What Is UML? 1
Comparison with Other Virtualization Technologies 2
Why Virtual Machines? 3
A Bit of History 4
What Is UML Used For? 8
The Future 14

Chapter 2: A Quick Look at UML 17

Booting UML for the First Time 20
Booting UML Successfully 24
Looking at a UML from the Inside and Outside 29
Conclusion 37

Chapter 3: Exploring UML 39

Logging In as a Normal User 39
Consoles and Serial Lines 40
Adding Swap Space 47
Partitioned Disks 49
UML Disks as Raw Data 53
Networking 54
Shutting Down 59

Chapter 4: A Second UML Instance 61

COW Files 61
Networking the UML Instances 71
A Virtual Serial Line 79

Chapter 5: Playing with a UML Instance 83

Use and Abuse of UML Block Devices 83
Networking and the Host 87

Chapter 6: UML Filesystem Management 101

Mounting Host Directories within a UML 101
Host Access to UML Filesystems 114
Making Backups 116
Extending Filesystems 117
When to Use What 118

Chapter 7: UML Networking in Depth 121

Manually Setting Up Networking 121
The UML Networking Transports 142
An Extended Example 155

Chapter 8: Managing UML Instances from the Host 167

The Management Console 167
Controlling a UML Instance with Signals 188

Chapter 9: Host Setup for a Small UML Server 191

Host Kernel Version 192
UML Execution Modes 194
Managing Long-Lived UML Instances 203
Networking 206
UML Physical Memory 206
Host Memory Consumption 208
umid Directories 209
Overall Recommendations 209

Chapter 10: Large UML Server Management 211

Security 212
Jailing UML Instances 216
Providing Console Access Securely 223
skas3 versus skas0 225
Future Enhancements 226
Final Points 232

Chapter 11: Compiling UML from Source 233

Downloading UML Source 234
Configuration 235
Compilation 249

Chapter 12: Specialized UML Configurations 251

Large Numbers of Devices 252
Clusters 265
UML as a Decision-Making Tool for Hardware 273

Chapter 13: The Future of UML 275

The externfs Filesystem 277
Virtual Processes 282
Captive UML 283
Virtualized Subsystems 295
Conclusion 298

Appendix A: UML Command-Line Options 301

Device and Hardware Specifications 301
Debugging Options 303
Management Options 304
Informational Options 305

Appendix B: UML Utilities Reference 307

humfsify 307
uml_moo 308
uml_mconsole 308
tunctl 310
uml_switch 311
Internal Utilities 312

Index 313

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Preface

When I started the User Mode Linux (UML) project in 1999, I had no idea how large a project it would become or how much of my time it would end up consuming. As time went on, the UML user base grew, and people found new ways to use it. As a result of their requests, UML contains a number of features that would never have occurred to me.

This book concentrates on the use of UML rather than its internals or plans for the future. I've tried to make it as easy as possible to get started with UML and put to good use all of the features my users induced me to add. Of course, I couldn't resist going into how UML works and what I have planned for its future. That would be too much to ask of any developer of any project. I hope this content adds to the book and the readers' understanding and appreciation of UML.

Read More Show Less

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