🐧 Montpelier, VT (05602) | Linux Administration & Support

Comprehensive Service Portfolio

I specialize in the full lifecycle of Unix/Linux environments. My expertise covers:

🏗️ System Setup & Management

• Installation & Upgrades: Seamless OS deployment and kernel patching.

• OS Hardening: Secure baseline configurations to prevent unauthorized access.

• Access Control: Expert management of SSH, sudo policies, users, and groups.

• Package Management: Handling dependencies across all major repositories.

📉 Monitoring & Performance Tuning

• Resource Optimization: Tuning CPU, Memory, Disk, and I/O for peak efficiency.

• Root Cause Analysis: Deep-dive log monitoring to prevent recurring issues.

• Capacity Planning: Ensuring your infrastructure scales before bottlenecks occur.

🛡️ Security & Compliance

• Vulnerability Remediation: Rapid security patching and audit logging.

• Firewall Management: Expert configuration of iptables and ufw.

• Hardening Tools: Implementation of SELinux and AppArmor profiles.

💾 Backup & Disaster Recovery

• Strategy Design: Automated backup validation and off-site replication.

• High Availability: Failover support to ensure zero-downtime operations.

🤖 Automation & DevOps

• Infrastructure as Code: Utilizing Terraform, Kubernetes, and Docker.

• Configuration Management: Automated deployments using Ansible.

• Scripting: Custom Bash and Python tools for operational efficiency.

🗄️ Application & Database Support

• Web & Mail: Optimization for Apache, Nginx, and Postfix.

• Databases: Specialized support for MySQL, PostgreSQL, and MongoDB.

🐧 Supported Distributions

I provide expert-level support for all major Linux distributions:

• Enterprise: RHEL (Red Hat Enterprise Linux), SUSE Linux Enterprise (SLES), Oracle Linux.

• Community/Server: Ubuntu Server, Debian, CentOS Stream, Rocky Linux, AlmaLinux.

• Desktop/Specialized: Fedora, Arch Linux, Kali Linux, Gentoo, openSUSE, Linux Mint.

📖 Linux Command Mastery

Navigating different distributions requires understanding their unique package managers.

🚀 Essential Commands by Family

🔧 Fixing Common Issues

1. Permission Denied: Use ls -l to check ownership. Fix with sudo chown user:group [file] or chmod 644 [file].

2. Disk Full: Run df -h to find the partition and du -sh * to find the culprit folder.

3. Service Won't Start: Check the journal immediately: journalctl -u [service_name] -xe.

🧰 The Expert’s Toolbox

To resolve complex issues, I utilize industry-standard diagnostic tools:

• Performance: htop, iotop, glances, and sar.

• Networking: tcpdump, wireshark (for packet analysis), and netstat.

• Storage: smartmontools for drive health and LVM for volume management.

• Security: Lynis for security auditing and Fail2Ban for intrusion prevention.

💡 Tips for a Successful Server Setup

• Document Everything: Always maintain an updated "Runbook" for your server configurations.

• Use Key-Based Auth: Disable password-based SSH login immediately to thwart 99% of brute-force attacks.

• Minimize Packages: Only install what is necessary to reduce the attack surface.

• Separate Partitions: Keep /home, /var, and / on separate partitions to prevent log files from crashing the OS.