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  • Book Overview & Buying CentOS 7 Linux Server Cookbook, Second Edition
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CentOS 7 Linux Server Cookbook, Second Edition

CentOS 7 Linux Server Cookbook, Second Edition - Second Edition

By : Jonathan Hobson
4.1 (10)
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CentOS 7 Linux Server Cookbook, Second Edition

CentOS 7 Linux Server Cookbook, Second Edition

4.1 (10)
By: Jonathan Hobson
Buy this Book

Overview of this book

This book will provide you with a comprehensive series of starting points that will give you direct access to the inner workings of the latest CentOS version 7 and help you trim the learning curve to master your server. You will begin with the installation and basic configuration of CentOS 7, followed by learning how to manage your system, services and software packages. You will then gain an understanding of how to administer the file system, secure access to your server and configure various resource sharing services such as file, printer and DHCP servers across your network. Further on, we cover advanced topics such as FTP services, building your own DNS server, running database servers, and providing mail and web services. Finally, you will get a deep understanding of SELinux and you will learn how to work with Docker operating-system virtualization and how to monitor your IT infrastructure with Nagios. By the end of this book, you will have a fair understanding of all the aspects of configuring, implementing and administering CentOS 7 Linux server and how to put it in control.
Table of Contents (17 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. Installing CentOS
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1. Installing CentOS
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Introduction
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Downloading CentOS and confirming the checksum on Windows or OS X
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Creating USB installation media on Windows or OS X
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Performing an installation of CentOS using the graphical installer
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Running a netinstall over HTTP
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Installing CentOS 7 using a kickstart file
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Getting started and customising the boot loader
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Troubleshooting the system in rescue mode
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Updating the installation and enhancing the minimal install with additional administration and development tools
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2. Configuring the System
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2. Configuring the System
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Introduction
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Navigating text files with less
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Introduction to Vim
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Speaking the right language
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Synchronizing the system clock with NTP and the chrony suite
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Setting your hostname and resolving the network
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Building a static network connection
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Becoming a superuser
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Customizing your system banners and messages
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Priming the kernel
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3. Managing the System
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3. Managing the System
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Introduction
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Knowing and managing your background services
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Troubleshooting background services
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Tracking system resources with journald
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Configuring journald to make it persistent
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Managing users and their groups
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Scheduling tasks with cron
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Synchronizing files and doing more with rsync
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Maintaining backups and taking snapshots
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Monitoring important server infrastructure
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Taking control with GIT and Subversion
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4. Managing Packages with YUM
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4. Managing Packages with YUM
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Introduction
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Using YUM to update the system
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Using YUM to search for packages
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Using YUM to install packages
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Using YUM to remove packages
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Keeping YUM clean and tidy
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Knowing your priorities
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Using a third-party repository
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Creating a YUM repository
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Working with the RPM package manager
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5. Administering the Filesystem
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5. Administering the Filesystem
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Introduction
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Creating a virtual block device
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Formatting and mounting a filesystem
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Using disk quotas
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Maintaining a filesystem
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Extending the capacity of the filesystem
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6. Providing Security
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6. Providing Security
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Introduction
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Locking down remote access and hardening SSH
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Installing and configuring fail2ban
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Working with a firewall
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Forging the firewall rules by example
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Generating self-signed certificates
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Using secure alternatives to FTP
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7. Building a Network
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7. Building a Network
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Introduction
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Printing with CUPS
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Running a DHCP server
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Using WebDAV for file sharing
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Installing and configuring NFS
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Working with NFS
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Securely sharing resources with Samba
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8. Working with FTP
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8. Working with FTP
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Introduction
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Installing and configuring the FTP service
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Working with virtual FTP users
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Customizing the FTP service
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Troubleshooting users and file transfers
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9. Working with Domains
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9. Working with Domains
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Introduction
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Installing and configuring a caching-only nameserver
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Setting up an authoritative-only DNS server
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Creating an integrated nameserver solution
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Populating the domain
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Building a secondary (slave) DNS server
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10. Working with Databases
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10. Working with Databases
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Introduction
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Installing a MariaDB database server
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Managing a MariaDB database
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Allowing remote access to a MariaDB server
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Installing a PostgreSQL server and managing a database
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Configuring remote access to PostgreSQL
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Installing phpMyAdmin and phpPgAdmin
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11. Providing Mail Services
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11. Providing Mail Services
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Introduction
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Configuring a domain-wide mail service with Postfix
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Working with Postfix
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Delivering the mail with Dovecot
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Using Fetchmail
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12. Providing Web Services
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12. Providing Web Services
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Introduction
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Installing Apache and serving web pages
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Enabling system users and building publishing directories
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Implementing name-based hosting
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Implementing CGI with Perl and Ruby
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Installing, configuring, and testing PHP
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Securing Apache
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Setting up HTTPS with Secure Sockets Layer (SSL)
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13. Operating System-Level Virtualization
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13. Operating System-Level Virtualization
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Introduction
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Installing and configuring Docker
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Downloading an image and running a container
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Creating your own images from Dockerfiles and uploading to Docker Hub
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Setting up and working with a private Docker registry
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14. Working with SELinux
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14. Working with SELinux
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Introduction
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Installing and configuring important SELinux tools
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Working with SELinux security contexts
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Working with policies
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Troubleshooting SELinux
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15. Monitoring IT Infrastructure
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15. Monitoring IT Infrastructure
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Introduction
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Installing and configuring Nagios Core
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Setting up NRPE on remote client hosts
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Monitoring important remote system metrics
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Index
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Index

Troubleshooting SELinux

In this recipe, you will learn how to troubleshoot SELinux policies, which is most often needed when access to some SELinux objects has been denied and you need to find out the reasons for it. In this recipe, we will show you how to work with the sealert tool, which will create human-readable and understandable error messages to work with.

Getting ready

To complete this recipe, you will require a working installation of the CentOS 7 operating system with root privileges. It is assumed that you are working through this chapter recipe by recipe, so by now you should have installed the SELinux tools and applied the Working with policies recipe in this chapter, as we will produce some SELinux denial events in order to show you how to use the log file tools.

How to do it...

  1. To begin, login as root and provoke a SELinux denial event:
    touch /var/www/html/test2.html
semanage fcontext -a -t user_tmp_t /var/www/html/test2.html
restorecon -v /var/www/html/test2.html
curl http:/...
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CentOS 7 Linux Server Cookbook, Second Edition
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