Course content

Linux System Administration (RHCSA) on CentOS 9

Understand and Use Essential Tools

• Access a shell prompt and issue commands with correct syntax
• Use input-output redirection (>, >>, |, 2>, etc.)
• Use grep and regular expressions to analyse text
• Access remote systems using SSH
• Log in and switch users in multiuser targets
• Archive, compress, unpack, and un-compress files using tar, star, gzip, and bzip2
• Create and edit text files
• Create, delete, copy, and move files and directories
• Create hard and soft links
• List, set, and change standard ugo/rwx permissions
• Locate, read and use system documentation including man, info & files in /usr/share/doc

Create Simple Shell Scripts

• Conditionally execute code (use of: if, test, [], etc.)
• Use Looping constructs (for, etc.) to process file, command line input
• Process script inputs ($1, $2, etc.)
• Processing output of shell commands within a script 

Operate Running Systems

• Boot, reboot, and shut down a system normally
• Boot systems into different targets manually
• Interrupt the boot process in order to gain access to a system
• Identify CPU/memory intensive processes and kill processes
• Adjust process scheduling
• Manage tuning profiles
• Locate and interpret system log files and journals
• Preserve system journals
• Start, stop, and check the status of network services
• Securely transfer files between systems

Configure Local Storage

• List, create, delete partitions on MBR and GPT disks
• Create and remove physical volumes
• Assign physical volumes to volume groups
• Create and delete logical volumes
• Configure systems to mount file systems at boot by universally unique ID (UUID) or label
• Add new partitions and logical volumes, and swap to a system non-destructively

Create and Configure File Systems

• Create, mount, unmount, and use vfat, ext4, and xfs file systems
• Mount and unmount network file systems using NFS
• Configure autofs
• Extend existing logical volumes
• Create and configure set-GID directories for collaboration
• Diagnose and correct file permission problems

Deploy, Configure and Maintain Systems

• Schedule tasks using at and cron
• Start and stop services and configure services to start automatically at boot
• Configure systems to boot into a specific target automatically
• Configure time service clients
• Install & update software packages from a remote repository or from the local ISO image
• Modify the system bootloader

Manage Basic Networking

• Configure IPv4 and IPv6 addresses
• Configure hostname resolution
• Configure network services to start automatically at boot
• Restrict network access using firewall-cmd/firewall

Manage Users and Groups

• Create, delete, and modify local user accounts
• Change passwords and adjust password aging for local user accounts
• Create, delete, and modify local groups and group memberships
• Configure superuser access

Manage Security

• Configure firewall settings using firewall-cmd/firewalld
• Manage default file permissions
• Configure key-based authentication for SSH
• Set enforcing and permissive modes for SELinux
• List and identify SELinux file and process context
• Restore default file contexts
• Manage SELinux port labels
• Use boolean settings to modify system SELinux settings
• Diagnose and address routine SELinux policy violations

Manage Containers

• Find and retrieve container images from a remote registry
• Inspect container images
• Perform container management using commands such as podman and skopeo
• Build a container from a Container file
• Perform basic container management such as running, starting, stopping, and listing running containers
• Run a service inside a container
• Configure a container to start automatically as a systemd service
• Attach persistent storage to a container

Linux System Engineer (RHCE) on CentOS 9

Be able to Perform all Tasks Expected of a Linux System Administrator

• Understand and use essential tools
• Operate running systems
• Configure local storage
• Create and configure file systems
• Deploy, configure, and maintain systems
• Manage users and groups
• Manage security

Understand Core Components of Ansible

• Inventories
• Modules
• Variables
• Facts
• Plays
• Playbooks
• Configuration files
• Use provided documentation to look up specific information about Ansible modules and commands

Install and Configure an Ansible Control Node

• Install required packages
• Create a static host inventory file
• Create a configuration file
• Create and use static inventories to define groups of hosts
• Manage parallelism

Configure Ansible managed nodes

• Create and distribute SSH keys to managed nodes
• Configure privilege escalation on managed nodes
• Validate a working configuration using ad hoc Ansible commands 

Script administration tasks

• Create simple shell scripts
• Create simple shell scripts that run ad hoc Ansible commands

Create Ansible Plays and Playbooks

• Know how to work with commonly used Ansible modules
• Use variables to retrieve the results of running a command
• Use conditionals to control play execution
• Configure error handling
• Create playbooks to configure systems to a specified state

Use Ansible Modules for System Administration Tasks that Work with

• Software packages and repositories
• Services
• Firewall rules
• File systems
• Storage devices
• File content
• Archiving
• Scheduled tasks
• Security
• Users and groups

Work with Roles

• Create roles
• Download roles from an Ansible Galaxy and use them

Use Advanced Ansible Features

• Create and use templates to create customized configuration files
• Use Ansible Vault in playbooks to protect sensitive data

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