Red_Hat_Enterprise_Linux-6-Virtualization_Getting_Started_Guide-en-US.pdf

Red Hat Enterprise Linux 6

Virtualization Getting

Started Guide

Virtualization Documentation

Virtualization Getting Started Guide

Red Hat Enterprise Linux 6 Virtualization Getting Started Guide

Virtualization Documentation

Edition 0.2

Author

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The Red Hat Enterprise Linux Virtualization Getting Started Guide describes the basics of

virtualization and the virtualization products and technologies that are available with Red Hat

Enterprise Linux.

Preface v

1. Document Conventions ................................................................................................... v

1.1. Typographic Conventions ...................................................................................... v

1.2. Pull-quote Conventions ........................................................................................ vi

1.3. Notes and Warnings ............................................................................................ vii

2. Getting Help and Giving Feedback ................................................................................. vii

2.1. Do You Need Help? ............................................................................................ vii

2.2. We Need Feedback! ........................................................................................... viii

1. Introduction 1

1.1. Who should read this guide? ........................................................................................ 1

1.2. Red Hat Enterprise Virtualization (RHEV) ...................................................................... 1

2. Getting started with Virtualization 3

2.1. What is virtualization? .................................................................................................. 3

2.2. Migration ...................................................................................................................... 3

2.3. Virtualized to virtualized migration (V2V) ........................................................................ 4

3. Advantages and misconceptions of virtualization 5

3.1. Virtualization costs ....................................................................................................... 5

3.2. Virtualization learning curve .......................................................................................... 5

3.3. Performance ................................................................................................................ 5

3.4. Disaster recovery ......................................................................................................... 6

3.5. Security ....................................................................................................................... 6

3.5.1. Virtualization security features ............................................................................ 6

3.6. Virtualization for servers and individuals ........................................................................ 7

4. Introduction to Red Hat virtualization products 9

4.1. KVM and virtualization in Red Hat Enterprise Linux ........................................................ 9

4.2. libvirt and the libvirt tools ............................................................................................ 10

4.3. Virtualized hardware devices ....................................................................................... 11

4.3.1. Virtualized and emulated devices ...................................................................... 11

4.3.2. Para-virtualized drivers ..................................................................................... 13

4.3.3. Physical host devices ...................................................................................... 14

4.3.4. Guest CPU models .......................................................................................... 15

4.4. Storage ...................................................................................................................... 16

4.4.1. Storage pools .................................................................................................. 17

5. Virtualization Tools 19

5.1. virsh ....................................................................................................................... 19

5.2. virt-manager .......................................................................................................... 19

5.3. virt-install .......................................................................................................... 19

5.4. guestfish ................................................................................................................ 19

5.5. Other useful tools ....................................................................................................... 20

A. Revision History 25

iii

Preface

1. Document Conventions

This manual uses several conventions to highlight certain words and phrases and draw attention to

specific pieces of information.

In PDF and paper editions, this manual uses typefaces drawn from the Liberation Fonts 1 set. The

Liberation Fonts set is also used in HTML editions if the set is installed on your system. If not,

alternative but equivalent typefaces are displayed. Note: Red Hat Enterprise Linux 5 and later includes

the Liberation Fonts set by default.

1.1. Typographic Conventions

Four typographic conventions are used to call attention to specific words and phrases. These

conventions, and the circumstances they apply to, are as follows.

Mono-spaced Bold

Used to highlight system input, including shell commands, file names and paths. Also used to highlight

keycaps and key combinations. For example:

To see the contents of the file my_next_bestselling_novel in your current

working directory, enter the cat my_next_bestselling_novel command at the

shell prompt and press Enter to execute the command.

The above includes a file name, a shell command and a keycap, all presented in mono-spaced bold

and all distinguishable thanks to context.

Key combinations can be distinguished from keycaps by the hyphen connecting each part of a key

combination. For example:

Press Enter to execute the command.

Press Ctrl + Alt + F2 to switch to the first virtual terminal. Press Ctrl + Alt + F1 to

return to your X-Windows session.

The first paragraph highlights the particular keycap to press. The second highlights two key

combinations (each a set of three keycaps with each set pressed simultaneously).

If source code is discussed, class names, methods, functions, variable names and returned values

mentioned within a paragraph will be presented as above, in mono-spaced bold . For example:

File-related classes include filesystem for file systems, file for files, and dir for

directories. Each class has its own associated set of permissions.

Proportional Bold

This denotes words or phrases encountered on a system, including application names; dialog box text;

labeled buttons; check-box and radio button labels; menu titles and sub-menu titles. For example:

Choose System

Mouse from the main menu bar to launch Mouse

Preferences . In the Buttons tab, click the Left-handed mouse check box and click

Preferences

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