Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases now! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Red Hat Enterprise Linux Server Cookbook
Red Hat Enterprise Linux Server Cookbook

Red Hat Enterprise Linux Server Cookbook: Over 60 recipes to help you build, configure, and orchestrate RHEL 7 Server to make your everyday administration experience seamless

Arrow left icon
Profile Icon Leemans Profile Icon Jakub Gaj
Arrow right icon
Mex$1128.99
Full star icon Full star icon Full star icon Full star icon Full star icon 5 (6 Ratings)
Paperback Dec 2015 250 pages 1st Edition
eBook
Mex$631.99 Mex$902.99
Paperback
Mex$1128.99
Subscription
Free Trial
Arrow left icon
Profile Icon Leemans Profile Icon Jakub Gaj
Arrow right icon
Mex$1128.99
Full star icon Full star icon Full star icon Full star icon Full star icon 5 (6 Ratings)
Paperback Dec 2015 250 pages 1st Edition
eBook
Mex$631.99 Mex$902.99
Paperback
Mex$1128.99
Subscription
Free Trial
eBook
Mex$631.99 Mex$902.99
Paperback
Mex$1128.99
Subscription
Free Trial

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Red Hat Enterprise Linux Server Cookbook

Chapter 1. Working with KVM Guests

In this chapter, we will cover the following recipes:

  • Installing and configuring a KVM
  • Configuring resources
  • Building VMs
  • Adding CPUs on the fly
  • Adding RAM on the fly
  • Adding disks on the fly
  • Moving disks to another storage
  • Moving VMs
  • Backing up your VM metadata

Introduction

This book will attempt to show you how to deploy RHEL 7 systems without too much of a hassle. As this book is written with automation in mind, I will emphasize on command-line utilities rather than elaborating on its GUI counterparts, which are useless for automation.

This chapter explains how to build and manage KVM guests using the libvirt interface and various tools built around it. It will provide a brief overview on how to set up a KVM on RHEL and manage its resources. The setup provided in this overview is far from the ready enterprise as it doesn't provide any redundancy, which is generally required in enterprises. However, the recipes provided are relevant in enterprise setups as the interface stays the same. Most of the time, you will probably use a management layer (such as RHEV or oVirt), which will make your life easier in managing redundancy.

Note

Libvirt is the API between the user and the various virtualization and container layers that are available, such as KVM, VMware, Hyper-V, and Linux Containers. Check https://libvirt.org/drivers.html for a complete list of supported hypervisors and container solutions.

As most tasks performed need to be automated in the end, I tend not to use any graphical interfaces as these do not allow an easy conversion into script. Hence, you will not find any recipes in this chapter involving a graphical interface. These recipes will primarily focus on virsh, the libvirt management user interface that is used to manage various aspects of your KVM host and guests. While a lot of people rely on the edit option of virsh, it doesn't allow you to edit a guest's configuration in real time. Editing your guest's XML configuration in this way will require you to shut down and boot your guest for the changes to take effect. A reboot of your guest doesn't do the trick as the XML configuration needs to be completely reread by the guest's instance in order for it to apply the changes. Only a fresh boot of the guest will do this.

The virsh interface is also a shell, so by launching virsh without any commands, you will enter the libvirt management shell. A very interesting command is help. This will output all the available commands grouped by keyword. Each command accepts the --help argument to show a detailed list of the possible arguments, and their explanation, which you can use.

Installing and configuring a KVM

This recipe covers the installing of virtualization tools and packages on RHEL 7.

By default, a RHEL 7 system doesn't come with a KVM or libvirt preinstalled. This can be installed in three ways:

  • Through the graphical setup during the system's setup
  • Via a kickstart installation
  • Through a manual installation from the command line

For this recipe, you should know how to install packages using yum, and your system should be configured to have access to the default RHEL 7 repository (refer to Chapter 8, Yum and Repositories, for more information), which is required for the packages that we will use.

Alternatively, you could install packages from the installation media using rpm, but you'll need to figure out the dependencies yourself.

Check the dependencies of an rpm using the following command:

~]# rpm -qpR <rpm file>

This will output a list of binaries, libraries, and files that you need installed prior to installing this package.

Check which package contains these files through this command:

~]# rpm -qlp <rpm package>

As you can imagine, this is a tedious job and can take quite some time as you need to figure out every dependency for every package that you want to install in this way.

Getting ready

To install a KVM, you will require at least 6 GB of free disk space, 2 GB of RAM, and an additional core or thread per guest.

Check whether your CPU supports a virtualization flag (such as SVM or VMX). Some hardware vendors disable this in the BIOS, so you may want to check your BIOS as well. Run the following command:

~]# grep -E 'svm|vmx' /proc/cpuinfo
flags    : ... vmx ...

Alternatively, you can run the following command:

~]# grep -E 'svm|vmx' /proc/cpuinfo
flags    : ... svm ...

Check whether the hardware virtualization modules (such as kvm_intel and kvm) are loaded in the kernel using the following command:

~]# lsmod | grep kvm
kvm_intel             155648  0
kvm                   495616  1 kvm_intel

How to do it…

We'll look at the three ways of installing a KVM onto your system.

Manual installation

This way of installing a KVM is generally done once the base system is installed by some other means. You need to perform the following steps:

  1. Install the software needed to provide an environment to host virtualized guests with the following command:
    ~]# yum -y install qemu-kvm qemu-img libvirt
    

    The installation of these packages will include quite a lot of dependencies.

  2. Install additional utilities required to configure libvirt and install virtual machines by running this command:
    ~]# yum -y install virt-install libvirt-python python-virthost libvirt-client
    
  3. By default, the libvirt daemon is marked to autostart on each boot. Check whether it is enabled by executing the following command:
    ~]# systemctl status libvirtd
    libvirtd.service - Virtualization daemon
       Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled)
       Active: inactive
         Docs: man:libvirtd(8)
               http://libvirt.org
    
  4. If for some reason this is not the case, mark it for autostart by executing the following:
    ~]# systemctl enable libvirtd
    
  5. To manually stop/start/restart the libvirt daemon, this is what you'll need to execute:
    ~]# systemctl stop libvirtd
    ~]# systemctl start libvirtd
    ~]# systemctl restart libvirtd
    

Kickstart installation

Installing a KVM during kickstart offers you an easy way to automate the installation of KVM instances. Perform the following steps:

  1. Add the following package groups to your kickstarted file in the %packages section:
    @virtualization-hypervisor
    @virtualization-client
    @virtualization-platform
    @virtualization-tools
  2. Start the installation of your host with this kickstart file.

Graphical setup during the system's setup

This is probably the least common way of installing a KVM. The only time I used this was during the course of writing this recipe. Here's how you can do this:

  1. Boot from the RHEL 7 Installation media.
  2. Complete all steps besides the Software selection step.
    Graphical setup during the system's setup
  3. Go to Software Selection to complete the KVM software selection.
  4. Select the Virtualization host radio button in Base Environment, and check the Virtualization Platform checkbox in Add-Ons for Selected Environment:
    Graphical setup during the system's setup
  5. Finalize the installation.
  6. On the Installation Summary screen, complete any other steps and click on Begin Installation.

See also

To set up your repositories, check out Chapter 8, Yum and Repositories.

To deploy a system using kickstart, refer to Chapter 2, Deploying RHEL "En Masse".

For more in-depth information about using libvirt, go to http://www.libvirt.org/.

RHEL 7 has certain support limits, which are listed at these locations:

https://access.redhat.com/articles/rhel-kvm-limits

https://access.redhat.com/articles/rhel-limits

Configuring resources

Virtual machines require CPUs, memory, storage, and network access, similar to physical machines. This recipe will show you how to set up a basic KVM environment for easy resource management through libvirt.

A storage pool is a virtual container limited by two factors:

  • The maximum size allowed by qemu-kvm
  • The size of the disk on the physical machine

Storage pools may not exceed the size of the disk on the host. The maximum sizes are as follows:

  • virtio-blk = 2^63 bytes or 8 exabytes (raw files or disk)
  • EXT4 = ~ 16 TB (using 4 KB block size)
  • XFS = ~8 exabytes

Getting ready

For this recipe, you will need a volume of at least 2 GB mounted on /vm and access to an NFS server and export.

We'll use NetworkManager to create a bridge, so ensure that you don't disable NetworkManager and have bridge-utils installed.

How to do it…

Let's have a look into managing storage pools and networks.

Creating storage pools

In order to create storage pools, we need to provide the necessary details to the KVM for it to be able to create it. You can do this as follows:

  1. Create a localfs storage pool using virsh on /vm, as follows:
    ~]# virsh pool-define-as --name localfs-vm --type 
    dir --target /vm
    
  2. Create the target for the storage pool through the following command:
    ~# mkdir -p /nfs/vm
    
  3. Create an NFS storage pool using virsh on NFS server:/export/vm, as follows:
    ~]# virsh pool-define-as --name nfs-vm --type network --source-host nfsserver --source-path /export/vm –target /nfs/vm
    
  4. Make the storage pools persistent across reboots through the following commands:
    ~]# virsh pool-autostart localfs-vm
    ~]# virsh pool-autostart nfs-vm
    
  5. Start the storage pool, as follows:
    ~]# virsh pool-start localfs-vm
    ~]# virsh pool-start nfs-vm
    
  6. Verify that the storage pools are created, started, and persistent across reboots. Run the following for this:
    ~]# virsh pool-list
     Name                 State      Autostart
    -------------------------------------------
     localfs-vm           active     yes
     nfs-vm               active     yes
    

Querying storage pools

At some point in time, you will need to know how much space you have left in your storage pool.

Get the information of the storage pool by executing the following:

~]# virsh pool-info --pool <pool name>
Name:           nfs-vm
UUID:           some UUID
State:          running
Persistent:     yes
Autostart:      yes
Capacity:       499.99 GiB
Allocation:     307.33 GiB
Available:      192.66 GiB

As you can see, this command easily shows you its disk space allocation and availability.

Tip

Be careful though; if you use a filesystem that supports sparse files, these numbers will most likely be incorrect. You will have to manually calculate the sizes yourself!

To detect whether a file is sparse, run ls -lhs against the file. The -s command will show an additional column (the first), showing the exact space that the file is occupying, as follows:

~]# ls -lhs myfile
121M -rw-------. 1 root root  30G Jun 10 10:27 myfile

Removing storage pools

Sometimes, storage is phased out. So, it needs to be removed from the host.

You have to ensure that no guest is using volumes on the storage pool before proceeding, and you need to remove all the remaining volumes from the storage pool. Here's how to do this:

  1. Remove the storage volume, as follows:
    ~]# virsh vol-delete --pool <pool name> --vol <volume name>
    
  2. Stop the storage pool through the following command:
    ~]# virsh pool-destroy --pool <pool name>
    
  3. Delete the storage pool using the following command:
    ~]# virsh pool-delete --pool <pool name>
    

Creating a virtual network

Before creating the virtual networks, we need to build a bridge over our existing network interface. For the sake of convenience, this NIC will be called eth0. Ensure that you record your current network configuration as we'll destroy it and recreate it on the bridge.

Unlike the storage pool, we need to create an XML configuration file to define the networks. There is no command similar to pool-create-as for networks. Perform the following steps:

  1. Create a bridge interface on your network's interface, as follows:
    ~]# nmcli connection add type bridge autoconnect yes con-name bridge-eth0 ifname bridge-eth0
    
  2. Remove your NIC's configuration using the following command:
    ~]# nmcli connection delete eth0
    
  3. Configure your bridge, as follows:
    ~]# nmcli connection modify bridge-eth0 ipv4.addresses <ip address/cidr> ipv4.method manual
    ~# nmcli connection modify bridge-eth0 ipv4.gateway <gateway ip address>
    ~]# nmcli connection modify bridge-eth0 ipv4.dns <dns servers>
    
  4. Finally, add your NIC to the bridge by executing the following:
    ~]# nmcli connection add type bridge-slave autoconnect yes con-name slave-eth0 ifname eth0 master bridge-eth0
    

For starters, we'll take a look at how we can create a NATed network similar to the one that is configured by default and called the default:

  1. Create the network XML configuration file, /tmp/net-nat.xml, as follows:
    <network>
      <name>NATted</name>
      <forward mode='nat'>
        <nat>
          <port start='1024' end='65535'/>
        </nat>
      </forward>
      <bridge name='virbr0' stp='on' delay='0'/>
      <ip address='192.168.0.1' netmask='255.255.255.0'>
        <dhcp>
          <range start='192.168.0.2' end='192.168.0.254'/>
        </dhcp>
      </ip>
    </network>
  2. Define the network in the KVM using the preceding XML configuration file. Execute the following command:
    ~]# virsh net-define /tmp/net-nat.xml
    

Now, let's create a bridged network that can use the network bound to this bridge through the following steps:

  1. Create the network XML configuration file, /tmp/net-bridge-eth0.xml, by running the following:
    <network>
        <name>bridge-eth0</name>
        <forward mode="bridge" />
        <bridge name="bridge-eth0" />
    </network>
  2. Create the network in the KVM using the preceding file, as follows:
    ~]# virsh net-define /tmp/net-bridge-eth0.xml
    

There's one more type of network that is worth mentioning: the isolated network. This network is only accessible to guests defined in this network as there is no connection to the "real" world.

  1. Create the network XML configuration file, /tmp/net-local.xml, by using the following code:
    <network>
      <name>isolated</name>
      <bridge name='virbr1' stp='on' delay='0'/>
      <domain name='isolated'/>
    </network>
  2. Create the network in KVM by using the above file:
    ~]# virsh net-define /tmp/net-local.xml
    

Creating networks in this way will register them with the KVM but will not activate them or make them persistent through reboots. So, this is an additional step that you need to perform for each network. Now, perform the following steps:

  1. Make the network persistent across reboots using the following command:
    ~]# virsh net-autostart <network name>
    
  2. Activate the network, as follows:
    ~]# virsh net-start <network name>
    
  3. Verify the existence of the KVM network by executing the following:
    ~]# virsh net-list --all
     Name                 State      Autostart     Persistent
    ----------------------------------------------------------
     bridge-eth0          active     yes           yes
     default              inactive   no            yes
     isolated             active     yes           yes
     NATted               active     yes           yes
    

Removing networks

On some occasions, the networks are phased out; in this case, we need to remove the network from our setup.

Prior to executing this, you need to ensure that no guest is using the network that you want to remove. Perform the following steps to remove the networks:

  1. Stop the network with the following command:
    ~# virsh net-destroy --network <network name>
    
  2. Then, delete the network using this command:
    ~]# virsh net-undefine --network <network name>
    

How it works…

It's easy to create multiple storage pools using the define-pool-as command, as you can see. Every type of storage pool needs more, or fewer, arguments. In the case of the NFS storage pool, we need to specify the NFS server and export. This is done by specifying--source-host and--source-path respectively.

Creating networks is a bit more complex as it requires you to create a XML configuration file. When you want a network connected transparently to your physical networks, you can only use bridged networks as it is impossible to bind a network straight to your network's interface.

There's more…

The storage backend created in this recipe is not the limit. Libvirt also supports the following backend pools:

Local storage pools

Local storage pools are directly connected to the physical machine. They include local directories, disks, partitions, and LVM volume groups. Local storage pools are not suitable for enterprises as these do not support live migration.

Networked or shared storage pools

Network storage pools include storage shared through standard protocols over a network. This is required when we migrate virtual machines between physical hosts. The supported network storage protocols are Fibre Channel-based LUNs, iSCSI, NFS, GFS2, and SCSI RDMA.

By defining the storage pools and networks in libvirt, you ensure the availability of the resources for your guest. If, for some reason, the resource is unavailable, the KVM will not attempt to start the guests that use these resources.

When checking out the man page for virsh (1), you will find a similar command to net-define, pool-define: net-create, and pool-create (and pool-create-as). The net-create command, similar to pool-create and pool-create-as, creates transient (or temporary) resources, which will be gone when libvirt is restarted. On the other hand, net-define and pool-define (as also pool-define-as) create persistent (or permanent) resources, which will still be there after you restart libvirt.

See also

You can find out more on libvirt storage backend pools at https://libvirt.org/storage.html

More information on libvirt networking can be found at http://wiki.libvirt.org/page/Networking

Building guests

After you install and configure a KVM on the host system, you can create guest operating systems. Every guest is defined by a set of resources and parameters stored in the XML format. When you want to create a new guest, creating such an XML file is quite cumbersome. There are two ways to create a guest:

  • Using virt-manager
  • Using virt-install

This recipe will employ the latter as it is perfect for scripting, while virt-manager is a GUI and not very well suited to automate things.

Getting ready

In this recipe, we will cover a generic approach to create a new virtual machine using the bridge-eth0 network bridge and create a virtual disk on the localfs-vm storage pool, which is formatted as QCOW2. The QCOW2 format is a popular virtual disk format as it allows thin provisioning and snapshotting. We will boot the RHEL 7 installation media located on the localfs-iso storage pool (rhel7-install.iso) to start installing a new RHEL 7 system.

How to do it…

Let's create some guests and delete them.

Create a guest

Let's first create a disk for the guest and then create the guest on this disk, as follows:

  1. Create a 10 GB QCOW2 format disk in the localfs-vm pool, as follows:
    ~]# virsh vol-create-as --pool localfs-vm --name rhel7_guest-vda.qcows2 --format qcows2 –capacity 10G
    
  2. Create the virtual machine and start it through the following command:
    ~]# virt-install \
    --hvm \
    --name rhel7_guest \
    –-memory=2048,maxmemory=4096 \
    --vcpus=2,maxvcpus=4 \
    --os-type linux \
    --os-variant rhel7 \
    --boot hd,cdrom,network,menu=on \
    --controller type=scsi,model=virtio-scsi \
    --disk device=cdrom,vol=localfs-iso/rhel7-install.iso,readonly=on,bus=scsi \
    --disk device=disk,vol=localfs-vm/rhel7_guest-vda.qcow2,cache=none,bus=scsi \
    --network network=bridge-eth0,model=virtio \
    --graphics vnc \
    --graphics spice \
    --noautoconsole \
    --memballoon virtio
    

Deleting a guest

At some point, you'll need to remove the guests. You can do this as follows:

  1. First, ensure that the guest is down by running the following:
    ~]# virsh list –all
     Id    Name                           State
    ----------------------------------------------------
    -     rhel7_guest                     shut off
    

    If the state is not shut off, you can forcefully shut it down:

    ~]# virsh destroy --domain <guest name>
    
  2. List the storage volumes in use by your guest and copy this somewhere:
    ~]# virsh domblklist <guest name>
    Type       Device     Target     Source
    ------------------------------------------------
    file       disk       vda        /vm/rhel7_guest-vda.qcow2
    file       cdrom      hda        /iso/rhel7-install.iso
    
  3. Delete the guest through the following command:
    ~]# virsh undefine --domain <guest name> --storage vda
    

    Adding --remove-all-storage to the command will wipe off the data on the storage volumes dedicated to this guest prior to deleting the volume from the pool.

How it works…

The virt-install command supports creating storage volumes (disks) by specifying the pool, size, and format. However, if this storage volume already exists, the application will fail. Depending on the speed of your KVM host disks (local or network) and the size of the guest's disks, the process of creating a new disk may take some time to be completed. By specifying an existing disk with virt-install, you can reuse the disk should you need to reinstall the guest. It would be possible to only create the disk on the first pass and change your command line appropriately after this. However, the fact remains that using virsh vol-create-as gives you more granular control of what you want to do.

We're using the QCOW2 format to contain the guest's disk as it is a popular format when it comes to storing KVM guest disks. This is because it supports thin provisioning and snapshotting.

When creating the guest, we specify both the maxmemory option for memory configuration and the maxvcpus option for vcpus configuration. This will allow us to add CPUs and RAM to the guest while it is running. If we do not assign these, we'll have to shut down the system before being able to change the XML configuration using the following command:

~# virsh edit <hostname>

As you can see, we're using the virtio driver for any hardware (network, disks, or balloon) that supports it as it is native to the KVM and is included in the RHEL 7 kernel.

Note

If, for some reason, your guest OS doesn't support virtio drivers, you should remove the --controller option of the command line and the bus specification from the --disk option.

For more information on virtio support, go to http://wiki.libvirt.org/page/Virtio.

The --memballoon option will ensure that we do not run into problems when we overcommit our memory. When specific guests require more memory, the ballooning driver will ensure that the "idle" guests' memory can be evenly redistributed.

The graphics option will allow you to connect to the guest through the host using either VNC (which is a popular client to control remote computers) or spice (which is the default client for virt-manager). The configuration for both VNC and spice is insecure, though. You can either set this up by specifying a password—by adding password=<password> to each graphics stanza—or by editing the /etc/libvirt/qemu.conf file on the KVM host, which will be applied to all guests.

There's more…

In this recipe, we used "local" install media in the form of an ISO image to install the system. However, it is also possible to install a guest without a CD, DVD, or an ISO image. The --location installation method option allows you to specify a URI that contains your kernel/initrd pair, which is required to start the installation.

Using --location in combination with --extra-args will allow you to specify kernel command-line arguments to pass to the installer. This can be used, for instance, to pass on the location of an Anaconda kickstart file for automated installs and/or specifying your IP configuration during the installer.

See also

Check the man page of virt-install (1) for more information on how to use it to your advantage.

Left arrow icon Right arrow icon

Key benefits

  • Create fully unattended installations and deploy configurations without breaking a sweat
  • Discover and kick-start the newest RHEL 7 configuration and management tools through an easy-to-follow, practical approach for a lazy system management
  • Be guided by an experienced RHEL expert who is a certified Linux engineer with a passion for open source and open standards

Description

Dominating the server market, the Red Hat Enterprise Linux operating system gives you the support you need to modernize your infrastructure and boost your organization’s efficiency. Combining both stability and flexibility, RHEL helps you meet the challenges of today and adapt to the demands of tomorrow. This practical Cookbook guide will help you get to grips with RHEL 7 Server and automating its installation. Designed to provide targeted assistance through hands-on recipe guidance, it will introduce you to everything you need to know about KVM guests and deploying multiple standardized RHEL systems effortlessly. Get practical reference advice that will make complex networks setups look like child’s play, and dive into in-depth coverage of configuring a RHEL system. Also including full recipe coverage of how to set up, configuring, and troubleshoot SELinux, you’ll also discover how secure your operating system, as well as how to monitor it.

Who is this book for?

Red Hat Enterprise Linux Server Cookbook is for RHEL 7 system administrators and DevOps in need of a practical reference guide to troubleshoot common issues and quickly perform tasks.

What you will learn

  • • Set up and configure RHEL 7 Server
  • • Use NetworkManager to configure all aspects of your network
  • • Manage virtual environments using libvirt
  • • Set up software repositories
  • • Secure and monitor your RHEL environment
  • • Configure SELinux, and create and apply its policies
  • • Create kickstart scripts to automatically deploy RHEL 7 systems
  • • Use Orchestration and configuration management tools to manage your environment
Estimated delivery fee Deliver to Mexico

Standard delivery 10 - 13 business days

Mex$149.95

Premium delivery 3 - 6 business days

Mex$299.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 23, 2015
Length: 250 pages
Edition : 1st
Language : English
ISBN-13 : 9781784392017
Vendor :
Red Hat
Concepts :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to Mexico

Standard delivery 10 - 13 business days

Mex$149.95

Premium delivery 3 - 6 business days

Mex$299.95
(Includes tracking information)

Product Details

Publication date : Dec 23, 2015
Length: 250 pages
Edition : 1st
Language : English
ISBN-13 : 9781784392017
Vendor :
Red Hat
Concepts :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
$19.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
$199.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just Mex$85 each
Feature tick icon Exclusive print discounts
$279.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just Mex$85 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total Mex$ 3,180.97
Red Hat Enterprise Linux Server Cookbook
Mex$1128.99
Mastering Linux Shell Scripting
Mex$799.99
Red Hat Enterprise Linux Troubleshooting Guide
Mex$1251.99
Total Mex$ 3,180.97 Stars icon

Table of Contents

11 Chapters
1. Working with KVM Guests Chevron down icon Chevron up icon
2. Deploying RHEL "En Masse" Chevron down icon Chevron up icon
3. Configuring Your Network Chevron down icon Chevron up icon
4. Configuring Your New System Chevron down icon Chevron up icon
5. Using SELinux Chevron down icon Chevron up icon
6. Orchestrating with Ansible Chevron down icon Chevron up icon
7. Puppet Configuration Management Chevron down icon Chevron up icon
8. Yum and Repositories Chevron down icon Chevron up icon
9. Securing RHEL 7 Chevron down icon Chevron up icon
10. Monitoring and Performance Tuning Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(6 Ratings)
5 star 100%
4 star 0%
3 star 0%
2 star 0%
1 star 0%
Filter icon Filter
Top Reviews

Filter reviews by




Thomas Jul 28, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Nice ISO section
Subscriber review Packt
Farrukh Mar 23, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This product is awesome. If you want to be a system administrator or engineer this is must have book. It has clear instructions.
Amazon Verified review Amazon
Perry Nally Mar 02, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you run RHEL then you need to read this book. I know you may be thinking, I'm already an expert at this stuff, but you're going to learn a few tricks that you didn't know. It puts the ease back in just having a set of utilities to grab when you're in a pinch. Good coverage of all topics. I was impressed with the monitoring sections at the end as well.
Amazon Verified review Amazon
SuJo Feb 27, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
A few of our clients are jumping over to RHEL 7 due to the updated packages, in order to get up to speed on the changes made from 6.7 to 7 I read this title. Helped clear up a few of the issues I had and overall the changes seemed to be better, but I'm a stickler for what works and 6.7 worked well for me. This book made a great companion for RHEL 7 and I highly recommend it for any System Engineer out there.
Amazon Verified review Amazon
ruben Mar 09, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Packed with a range of useful 'recipes', this cookbook provides you with quick solutions to common Red Hat Enterprise Linux 7 Server challenges, from installation to configuration and even automation. Designed to provide targeted assistance through hands-on recipe guidance, it will introduce you to everything you need to know about KVM guests and deploying multiple standardized RHEL systems effortlessly. Get practical reference advice that will make complex networks setups look like child’s play, and dive into in-depth coverage of configuring a RHEL system. Also including full recipe coverage of how to set up, configuring, and troubleshoot SELinux, you’ll also discover how secure your operating system, as well as how to monitor it.
Amazon Verified review Amazon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela