Tinta Lab

Personal hands-on infrastructure laboratory focused on systems administration, networking, virtualization, monitoring and automation.

The purpose of this repository is to document practical infrastructure scenarios, configurations, troubleshooting procedures and automation developed in a controlled lab environment.

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🚀 Active Workstream — Linux Operations / Tinta Status

The current Linux workstream focuses on operational automation and troubleshooting through a lightweight status service running on TINTA-LNX01.

Current implementation includes:

Implemented capabilities include:

• System and service state collection using Bash
• Memory and filesystem metric processing
• Text processing with pipes, grep, awk, head and tail
• Conditional health classification
• Automated execution with cron
• Application and cron logging
• Linux users, groups and least-privilege permissions
• Nginx-based web publishing
• Temporary-file and atomic-rename deployment
• HTTP availability validation
• Build/content validation
• Exit-code based failure handling
• Controlled troubleshooting scenarios

Operational Flow

cron
  ↓
gerar-status.sh
  ↓
collect system metrics
  ↓
generate staging HTML + Build ID
  ↓
copy to temporary deployment file
  ↓
atomic rename to index.html
  ↓
HTTP availability check
  ↓
served-content / Build ID validation
  ↓
SUCCESS / ERROR log

Failure Scenarios Reproduced

• Shell script without execute permission
• Cron execution failure
• Deployment permission denied
• Difference between file and directory permissions
• Nginx stopped / TCP connection refused
• HTTP health-check failure

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🎯 Objectives

Tinta Lab is used to develop practical experience in:

• Windows Server administration
• Linux administration
• Active Directory
• DNS
• TCP/IP networking
• Firewall and routing
• Remote administration
• Virtualization
• Monitoring
• Infrastructure troubleshooting
• PowerShell and Shell automation

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🏗️ Current Architecture

The environment currently runs on VMware and includes:

Component	Role
Windows Server 2022	Domain Controller / DNS
Ubuntu Server	Linux services and administration
FortiGate VM	Firewall / routing
VMware	Virtualization platform

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🌐 Network

Main lab network:

10.10.10.0/24

Domain:

tintalab.lab

Current addressing:

Host	IP Address	Role
FortiGate VM	10.10.10.1	Gateway / Firewall / DHCP
TINTA-DC01	10.10.10.10	Windows Server 2022 / AD DS / DNS
TINTA-LNX01	10.10.10.20	Ubuntu Server 22.04 LTS / Linux Services

The addresses documented in this repository belong only to the isolated laboratory environment.

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🪟 Windows Server

Current environment:

• Windows Server 2022
• Active Directory Domain Services
• DNS
• Domain Controller
• User and group administration
• Group Policy
• Remote administration
• Windows services
• Network diagnostics
• Performance analysis
• PowerShell administration

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🐧 Linux

The Linux workstream currently covers:

• SSH administration
• Linux users, groups and supplementary groups
• File and directory permission models
• chmod, chown, setgid and least privilege
• Service management with systemd
• Cron scheduling and troubleshooting
• stdout, stderr and exit codes
• Log inspection with journalctl
• Resource inspection with free, df, ps and ss
• Text processing with pipes, grep, awk, head and tail
• Bash scripting
• Nginx administration
• HTTP health checks with curl
• Controlled incident reproduction and diagnosis

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🔥 Networking & Firewall

Topics practiced in the environment include:

• IPv4 addressing
• Subnetting
• Default gateways
• DNS resolution
• Routing
• NAT
• Firewall policies
• Network segmentation
• Connectivity troubleshooting

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📊 Monitoring

Monitoring topics include:

• Zabbix
• Host availability
• Network monitoring
• Resource utilization
• Service health
• Incident investigation

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⚙️ Automation

Automation exercises include:

• PowerShell
• Shell Script
• Windows administration
• Network diagnostics
• System inventory
• Operational checks

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📚 Repository Structure

The repository will grow as the laboratory evolves.

tinta-lab/
├── README.md
├── docs/
│   ├── architecture.md
│   ├── windows-server/
│   ├── linux/
│   ├── networking/
│   └── monitoring/
├── scripts/
│   ├── powershell/
│   └── bash/
└── diagrams/

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🧪 Lab Philosophy

The objective of Tinta Lab is not only to execute commands, but to understand the troubleshooting process:

Symptom
   ↓
Observation
   ↓
Evidence
   ↓
Hypothesis
   ↓
Validation
   ↓
Resolution
   ↓
Documentation

This approach is used to reproduce situations commonly found in infrastructure and technical support environments.

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🔐 Security

This repository contains only laboratory information.

No production credentials, private keys, passwords, API tokens or confidential company configurations are stored in this repository.

Sensitive information from real environments is never published here.

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🚧 Current Status

Tinta Lab is an evolving project.

Current focus:

• Windows Server administration
• Linux administration
• Network troubleshooting
• Monitoring
• Remote administration
• Infrastructure automation

Future additions may include:

• Additional Linux servers
• Database administration
• Backup environments
• High availability concepts
• Infrastructure monitoring improvements
• Additional automation

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👤 Author

Madson Rocha

IT Infrastructure & Support

Linux | Windows Server | Networking | Monitoring | Automation