Complete Red Hat System Administration Boot Camp - RHCSA 9

Use the pwd command to print the current working directory and the cd command to navigate directories, including home with tilde and the previous directory via cd -.

Learn to use the date, cal, and uptime commands to display the current date, monthly or specific calendars, and system uptime with user counts and load averages.

Use df and du to display disk usage and partitions. Show file system types with -T/--print-type and render human readable output with -h, and use -c for a total.

Use the history command to view, replay, and delete specific entries with history -d, clear the history with history -c, clear the screen with clear, and exit the terminal.

Learn to use uname to print system information and specific kernel details such as name, release, version, processor, and machine. Use hostname to view or change the host name.

Master the find command to locate files and directories from the current directory or /home, using -name, -type, -size, -user, -group, -perm, and -iname, with -exec or -delete.

Learn to use gedit and nano editors on Linux, including syntax highlighting, fonts and colors, undo and redo, and search and replace, plus basic file creation, saving, and viewing.

Explore permission modes in Linux, using symbolic and absolute chmod methods to add, remove, or set rwx permissions for user, group, and others with the change mode command.

Learn how umask determines default file and directory permissions with a four-digit mask (typically 0022), and how to view, set, and persist changes in .bashrc or /etc/profile.

Explore the three Linux special permissions—setuid, setgid, and the sticky bit—and how chmod assigns them on executables, scripts, and directories to control privileged access, with security considerations.

Explore the three special permissions, set user id, set group id, and sticky bit, and learn how they let users run executables as owners or group members, and protect files.

Learn how to change file attributes in Linux with the chattr command. Apply append only and immutable attributes to files and directories, adding or removing them with plus and minus.

Apply access control lists recursively to a directory and all subdirectories and files, modify user permissions to read and write, and set or remove default ACLs to control access.

Learn to add a host with an alias by editing the /etc/hosts file, enter IP address 172.16.1.101 and a nickname, save, and verify connectivity with ping.

learn to use nmcli to control network manager, create and modify connections, view devices and active interfaces, and configure IPv4 addresses, gateway, and DNS, then activate the desired connection.

Install and start the Apache httpd server, configure the document root, adjust SELinux contexts for the new directory, and enable port 81 with verification using curl.

Explore Linux process concepts and learn to use the ps and top commands to view running processes, display all processes, filter by user, and interpret status codes.

Demonstrates using scp, the secure copy protocol, to transfer files between local and remote machines, and using ssh for encrypted remote access, including ssh key pairs and passwordless login.

Learn how to use systemctl to manage systemd services and units, list all units, check status, start, stop, restart, enable, and disable services for reliable Linux administration.

Schedule tasks in Linux using cron by viewing, editing, and creating crontab entries with crontab commands, and automate actions with touch and rm commands for specific users.

Modify the GRUB configuration in /etc/default/grub to control the boot menu timeout and default kernel, then generate a new /boot/grub2/grub.cfg with grub2-mkconfig and reboot to load the kernel.

Create and configure a new swap partition on Linux by using fdisk, change type to 82, run partprobe, make swap, update /etc/fstab, and swap on.

Configure remote file systems with NFS by setting up a server and client, exporting a shared directory via /etc/exports, and mounting it on the client.

Learn two methods to auto start container images under systemd user services: enable container cgroup and enable linger for per-user containers with podman.

Learn two methods to add persistent storage to container images by mounting host directories, configuring permissions, and using SELinux options, with a MySQL/MariaDB example.