Linux Bible. Christopher Negus

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       Understand essential tools: You are expected to have a working knowledge of the command shell (bash), including how to use proper command syntax and do input/output redirection (< > >>). You need to know how to log in to remote and local systems. Expect to have to create, edit, move, copy, link, delete, and change permission and ownership on files. Likewise, you should know how to look up information on man pages and /usr/share/doc. Most of these topics are covered in Chapter 3 and Chapter 4 in this book. Chapter 5 describes how to edit and find files.

       Operate running systems: In this category, you must understand the Linux boot process, and how to shut down, reboot, and change to different targets (previously called runlevels). You need to identify processes and kill processes as requested. You must be able to find and interpret log files. Chapter 15 describes how to change targets and manage system services. See Chapter 6 for information on managing and changing processes. Logging is described in Chapter 13.

       Configure local storage: Setting up disk partitions includes creating physical volumes and configuring them to be used for Logical Volume Management (LVM) or encryption (LUKS). You should also be able to set up those partitions as filesystems or swap space that can be mounted or enabled at boot time. Disk partitioning and LVM are covered in Chapter 12. LUKS and other encryption topics are described in Chapter 23, “Understanding Advanced Linux Security.”

       Create and configure filesystems: Create and automatically mount different kinds of filesystems, including regular Linux filesystems (ext2, ext3, or ext4) and network filesystems (NFS). Create collaborative directories using the set group ID bit feature. You must also be able to use LVM to extend the size of a logical volume. Filesystem topics are covered in Chapter 12. See Chapter 20 for NFS coverage.

       Deploy, configure, and maintain systems: This covers a range of topics, including configuring networking and creating cron tasks. For software packages, you must be able to install packages from Red Hat Content Delivery Network (CDN), a remote repository, or the local filesystem. The cron facility is described in Chapter 13.

       Manage users and groups: You must know how to add, delete, and change user and group accounts. Another topic that you should know is password aging, using the chage command. See Chapter 11 for information on configuring users and groups.

       Manage security: You must have a basic understanding of how to set up a firewall (firewalld, system-config-firewall, or iptables) and how to use SELinux. You must be able to set up SSH to do key-based authentication. Learn about SELinux in Chapter 24. Firewalls are covered in Chapter 25. Chapter 13 includes a description of key-based authentication.

       Firewalls: Block or allow traffic to selected ports on your system that offer services such as web, FTP, and NFS, as well as block or allow access to services based on the originator's IP address. Firewalls are covered in Chapter 25, “Securing Linux on a Network.”

       Kerberos authentication: Use Kerberos to authenticate users on a RHEL system.

       System reports: Use features such as sar to report on system use of memory, disk access, network traffic, and processor utilization. Chapter 13 describes how to use the sar command.

       Shell scripting: Create a simple shell script to take input and produce output in various ways. Shell scripting is described in Chapter 7.

       SELinux: With Security Enhanced Linux in Enforcing mode, make sure that all server configurations described in the next section are properly secured with SELinux. SELinux is described in Chapter 24.

       Ansible: Understand core Ansible components (inventories, modules, playbooks, and so on). Be able to install and configure an Ansible control node. Work with Ansible roles and use advanced Ansible features. See Chapter 29 for information on using Ansible playbooks to install and manage Linux systems.

       Web server: Configure an Apache (HTTP/HTTPS) server. You must be able to set up a virtual host, deploy a CGI script, use private directories, and allow a particular Linux group to manage the content. Chapter 17 describes how to configure a web server.

       DNS server: Set up a DNS server (bind package) to act as a caching-only name server that can forward DNS queries to another DNS server. No need to configure master or slave zones. DNS is described from the client side in Chapter 14. For information on configuring a DNS server with Bind, see the RHEL Networking Guide athttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/networking_guide/index

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