it-knowledge/src/rhcsa.md

# RHCSA Study Notes

## Exam Information
- Exam Code: EX200
- Duration: 2.5 hours
- Passing Score: 210/300 (70%)

[CLI Commands](rhcsa.md#cli-commands)

## Core Topics

### 1. Essential Tools
- [x] Access a shell prompt and issue commands
- [x] Use input-output redirection
- [x] Use grep and regular expressions
- [x] Access remote systems using SSH
- [x] Log in and switch users in multiuser targets

### 2. File Management
- [x] Create, delete, copy, and move files and directories
- [x] Create and manage hard and soft links
- [x] Find files and directories
- [x] Manage file permissions and ownership

### 3. Service Configuration
- [x] Configure networking and hostname resolution
- [ ] Start, stop, and check system service status
- [ ] Configure services to start automatically at boot
- [ ] Configure time service clients

### 4. Storage Management
- [ ] List, create, delete, and modify physical storage partitions
- [ ] Create and configure filesystem
- [ ] Configure and manage swap space
- [ ] Create and manage LVM storage
- [ ] Create and manage STRATIS storage

### 5. Container Management
- [ ] Find and retrieve container images
- [ ] Create and manage containers
- [ ] Configure container storage

### 6. System Management
- [ ] Boot, reboot, and shut down a system
- [ ] Install Red Hat Enterprise Linux
- [ ] Use systemd targets for system management
- [ ] Configure system logging
- [ ] Schedule tasks using cron and systemd timers

### 7. Security
- [ ] Configure firewall settings
- [ ] Configure SELinux
- [ ] Manage users and groups
- [ ] Set file permissions and ownership

## Resources
- Official Red Hat Documentation
- Practice Environments
- Useful Commands Reference

## Progress Tracking
- [ ] Complete practice exams
- [ ] Lab environment setup
- [ ] Hands-on practice completed

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*Note: Check boxes can be used to track progress on each topic as you study*

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# CLI Commands

## Networking

### nmtui
```bash
nmtui # Network Manager Text User Interface
```

### ip
```bash
sudo ip addr add dev eth0 192.168.2.2/24 # Add an IP address to the interface eth0 Note: Not persistent, will be lost on reboot
```

### nmcli
```bash
nmcli connection add connection.interface-name ens160 ipv4.addresses 192.168.100.1/24 ipv4.gateway 192.168.100.254 type ethernet # Persistant IP address

sudo nmcli connection up ethernet-ens160 # Bring up the ethernet interface

sudo nmcli connection down ethernet-ens160 # Bring down the ethernet interface

sudo nmcli connection delete id "ens160" # Delete the ethernet connection

sudo nmcli connection show # Show all connections
```

## Manage and Monitor Processes

### top
```bash
top # Display running processes

top -o %MEM # Sort by memory usage

top -o %CPU # Sort by CPU usage
```