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  • Book Overview & Buying CentOS 7 Server Deployment Cookbook
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CentOS 7 Server Deployment Cookbook

CentOS 7 Server Deployment Cookbook

By : Boronczyk, NADAREISHVILI
5 (1)
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CentOS 7 Server Deployment Cookbook

CentOS 7 Server Deployment Cookbook

5 (1)
By: Boronczyk, NADAREISHVILI
Buy this Book

Overview of this book

CentOS is derived from Red Hat Enterprise Linux (RHEL) sources and is widely used as a Linux server. This book will help you to better configure and manage Linux servers in varying scenarios and business requirements. Starting with installing CentOS, this book will walk you through the networking aspects of CentOS. You will then learn how to manage users and their permissions, software installs, disks, filesystems, and so on. You’ll then see how to secure connection to remotely access a desktop and work with databases. Toward the end, you will find out how to manage DNS, e-mails, web servers, and more. You will also learn to detect threats by monitoring network intrusion. Finally, the book will cover virtualization techniques that will help you make the most of CentOS.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Sections
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Getting Started with CentOS
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1. Getting Started with CentOS
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Introduction
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Installing CentOS using Anaconda in graphics mode
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Installing CentOS using Anaconda in text mode
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Coordinating multiple installations using Kickstart
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Running a cloud image with Amazon Web Services' EC2
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Installing a container image from the Docker Registry
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Installing the GNOME desktop
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Installing the KDE Plasma desktop
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2. Networking
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2. Networking
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Introduction
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Setting a static IP address
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Binding multiple addresses to a single Ethernet device
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Bonding two Ethernet devices
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Configuring the network firewall with FirewallD
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Configuring the network firewall using iptables
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Installing a DHCP server
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Configuring an NFS server to share a filesystem
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Configuring an NFS client to use a shared filesystem
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Serving Windows shares with Samba
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3. User and Permission Management
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3. User and Permission Management
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Introduction
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Escalating privileges with sudo
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Enforcing password restrictions
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Setting default permissions for new files and directories
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Running binaries as a different user
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Working with SELinux for greater security
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4. Software Installation Management
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4. Software Installation Management
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Introduction
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Registering the EPEL and Remi repositories
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Prioritizing repositories using the Priorities plugin
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Automating software updates with yum-cron
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Verifying installed RPM packages
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Compiling a program from source
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5. Managing Filesystems and Storage
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5. Managing Filesystems and Storage
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Introduction
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Viewing the size of files and available storage
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Setting storage limits for users and groups
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Creating a RAM disk
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Creating a RAID
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Replacing a device in a RAID
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Creating a new LVM volume
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Removing an existing LVM volume
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Adding storage and growing an LVM volume
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Working with LVM snapshots
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6. Allowing Remote Access
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6. Allowing Remote Access
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Introduction
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Running commands remotely through SSH
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Configuring a more secure SSH login
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Securely connecting to SSH without a password
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Restricting SSH access by user or group
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Protecting SSH with Fail2ban
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Confining sessions to a chroot jail
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Configuring TigerVNC
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Tunneling VNC connections through SSH
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7. Working with Databases
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7. Working with Databases
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Introduction
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Setting up a MySQL database
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Backing up and restoring a MySQL database
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Configuring MySQL replication
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Standing up a MySQL cluster
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Setting up a MongoDB database
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Backing up and restoring a MongoDB database
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Configuring a MongoDB replica set
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Setting up an OpenLDAP directory
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Backing up and restoring an OpenLDAP database
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8. Managing Domains and DNS
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8. Managing Domains and DNS
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Introduction
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Setting up BIND as a resolving DNS server
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Configuring BIND as an authoritative DNS server
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Writing a reverse lookup zone file
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Setting up a slave DNS server
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Configuring rndc to control BIND
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9. Managing E-mails
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9. Managing E-mails
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Introduction
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Configuring Postfix to provide SMTP services
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Adding SASL to Postfix with Dovecot
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Configuring Postfix to use TLS
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Configuring Dovecot for secure POP3 and IMAP access
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Targeting spam with SpamAssassin
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Routing messages with Procmail
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10. Managing Web Servers
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10. Managing Web Servers
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Introduction
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Installing Apache HTTP Server and PHP
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Configuring name-based virtual hosting
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Configuring Apache to serve pages over HTTPS
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Enabling overrides and performing URL rewriting
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Installing NGINX as a load balancer
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11. Safeguarding Against Threats
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11. Safeguarding Against Threats
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Introduction
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Sending messages to Syslog
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Rotating log files with logrotate
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Using Tripwire to detect modified files
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Using ClamAV to fight viruses
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Checking for rootkits with chkrootkit
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Using Bacula for network backups
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12. Virtualization
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12. Virtualization
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Introduction
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Creating a new virtual machine
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Cloning a virtual machine
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Adding storage to a virtual machine
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Connecting USB peripherals to a guest system
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Configuring a guest's network interface

Installing CentOS using Anaconda in text mode

Next, you'll learn how to install CentOS using Anaconda in text mode. It's recommended that you install CentOS graphically because graphics mode is easier to use and offers more functionality. However, it may not be available when the system lacks sufficient resources to run the installer in graphical mode, for example, if the display adaptor's capabilities are limited or if there is reduced RAM.

Getting ready

This recipe assumes that you have a copy of the CentOS 7 installation medium. If you don't, visit https://www.centos.org to download an ISO image and then burn the image to a disc.

How to do it...

Follow these steps to perform a text-based installation of CentOS:

  1. Insert the installation disc into your system's optical drive (or USB stick into a USB port) and reboot. The system should boot to the CentOS 7 installation menu.
  2. Using the arrow keys, make sure the Install CentOS 7 option is highlighted and press Tab. The command to boot the installer kernel appears at the bottom of the screen.
  3. Add the word text to the end of the list of arguments and press Enter. Anaconda will launch in text mode:
           vmzlinuz initrd=initrd.img inst.stage2=hd:LABEL=CentOS 
       \x207\x20x86_64 rd.live.check quiet text

    Note

    Anaconda will launch in text mode automatically if your system has less than 768 MB of RAM.

  4. The Installation menu presents the installation options by category. Type 2 and press Enter to select Timezone settings:
    How to do it...

    The text-based installation menu categorizes the installation options

  5. The Timezone settings menu presents a list of regions. Enter the number for the desired value.
  6. You will be given a list of available time zones in the selected region (paginate through the list by pressing Enter if the list is long). Enter the number for the desired time zone.
  7. If you know what purpose the system will serve and require something more than a minimal installation, enter 3 to select Software selection. Here you can select groups of software packages for that purpose. When finished, enter c to continue back to the Installation menu.
  8. Enter 5 to select Network settings.
  9. Enter 1 to set the system's hostname. Type the desired name and press Enter.
  10. Enter the number to configure the system's primary network interface. Then, enter 7 to mark Connect automatically after reboot and 8 to mark Apply configuration in installer. Enter c to go back to the Network settings menu and c again to return to the Installation menu:
    How to do it...

    The Network settings menu lets us configure the system's network interfaces

  11. Enter 6 to select Install Destination.
  12. If the desired drive is not already marked, enter the number for the drive. Then, enter c to continue. The Autopartioning Options menu is shown in the following screenshot:
    How to do it...

    The Install Destination menu let us set the installation target and the Autopartioning Options menu lets us specify how the disk will be used

  13. Enter the number for the desired partitioning (Use All Space is the default) and then c to continue.
  14. Select the desired partition scheme (LVM is the default) and then enter c to return to the Installation menu.
  15. Enter 8 to select Create user.
  16. Enter 1 to mark the Create user option. Provide your name and set a username for the account by entering 2 and 3 respectively. Enter 4 to mark the Use password option and then 5 to set your password. Then, enter c to return to the Installation menu:

    Note

    You must confirm you really want to use your password if you provide a password that is too weak.

    How to do it...

    The Create User menu let us create an unprivileged user account

  17. Enter 9 to select Set root password. Enter and confirm the password you want to use for the system's root account.
  18. After all of the sections that required attention have been resolved, enter b to begin the installation process.
  19. When the installation is complete, remove the media from the drive and reboot the system.

How it works...

This recipe showed you how to install CentOS using Anaconda running in text mode. The process began when we booted the system from the installation disc, selected Install CentOS 7 from the installation menu, and added the text option to the boot parameters. The installer's kernel loaded into memory and Anaconda launched in text mode.

The text-based installation is similar to installing CentOS in graphical mode, answering prompts for time zone, software, and networking information. However, Anaconda presents the prompts in a different order when running in text mode and some functionality is missing. For example, we can't perform custom disk partitioning. Nevertheless, text mode enables us to quickly install a basic CentOS system.

See also

For more information on installing CentOS 7, refer to the RHEL 7 Installation Guide (https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide).

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