Hi! Bonjour!, I'm Annick Abisse 👋

Principal Linux Systems Administrator | RHEL | Security | Automation

I administer, secure, and troubleshoot enterprise Linux infrastructure, with hands-on experience supporting 400+ Red Hat Enterprise Linux systems across RHEL 7, 8, and 9.

My work focuses on system reliability, security hardening, storage, identity integration, centralized logging, automation, and disciplined incident resolution. This GitHub profile turns those skills into sanitized, reproducible lab projects.

🔧 Core Expertise Enterprise Linux: RHEL 7/8/9, package management, boot recovery, permissions, processes, and performance Security: SELinux, auditd, STIG-aligned hardening, FIPS-aware administration, least privilege, and vulnerability remediation Storage: LVM, XFS, NFS, autofs, capacity management, and network-storage troubleshooting Identity: Active Directory and LDAP integration, PAM/NSS, access control, DNS, and time dependencies Services: systemd, chrony, rsyslog, VNC/xrdp, DHCP/TFTP, and Splunk Universal Forwarder Networking: NetworkManager, routing, DNS, firewalls, port validation, and 802.1X troubleshooting Automation: Bash scripting, system health checks, operational runbooks, and Ansible development Platforms: VMware/ESXi, Proxmox VE, Podman, Windows Server interoperability, and Splunk

🧪 Linux Master Portfolio I am building a practical portfolio around real Linux administration scenarios reproduced safely in my home lab.

Project: system-health-check What It Demonstrates: Bash-based checks for filesystems, memory, failed services, logs, networking, and time synchronization Status: ✅ Live

Project: audit-capacity-guard What It Demonstrates: Read-only RHEL audit-log capacity monitoring, systemd scheduling, and evidence-preserving recovery Status: ✅ Live

Project: nfs-autofs-lab What It Demonstrates: Reproducible RHEL lab covering NFS, autofs, SELinux, failure injection, and structured troubleshooting Status: ✅ Live

Project: rhel-identity-preflight What It Demonstrates: Read-only validation of AD DNS, Kerberos, LDAP, time, ports, SSSD, and identity resolution on RHEL Status: ✅ Live

Project: selinux-troubleshooting-lab What It Demonstrates: RHEL lab covering AVC analysis, persistent file contexts, port labeling, booleans, and secure policy decisions Status: ✅ Live

Project: rhel-ansible-baseline-lab What It Demonstrates: Repeatable configuration for packages, users, time, logging, and security controls Status: ✅ Live

Project: rootless-podman-lab What It Demonstrates: Container deployment, persistent storage, systemd integration, health checks, resource limits, SELinux labeling, troubleshooting, and rootless operation Status: ✅ Live

Project: splunk-security-lab What It Demonstrates: Centralized Linux and Windows event collection, searches, dashboards, and failure analysis Status: ✅ Live

Repositories will be linked here as each project is published.

🏠 Home Lab My lab provides a safe environment for reproducing enterprise concepts and documenting the results.

• Hypervisor: Proxmox VE
• Linux: RHEL 9 workstation and server systems
• Identity: Windows Server 2025 Active Directory domain
• Security testing: Kali Linux
• Observability: Splunk with Linux and Windows forwarders
• Storage: XFS-backed file services, NFS exports, and autofs clients
• Client systems: Windows 11 and Linux workstations Current lab priorities include hybrid identity, centralized logging, SELinux, NFS/autofs, systemd recovery, LVM, and Ansible automation.

🧭 How I Troubleshoot

• Define the symptom and operational impact.
• Establish the current state with logs, service status, configuration, and recent changes.
• Compare failing and known-good systems when possible.
• Isolate the failure domain before changing configuration.
• Apply the smallest reversible correction.
• Validate service health, user-visible behavior, security controls, and reboot persistence.
• Convert the resolution into a reusable script, runbook, or lab exercise.

🎓 Education and Certifications

• Master of Science — Cybersecurity
• Master of Science — Federal Acquisition and Supply Chain Management
• Bachelor of Business Administration
• CompTIA Security+
• LPIC-1: Linux Administrator
• RHCSA development track: SELinux, networking, storage/LVM, and systemd

📚 Currently Building

• Production-quality Bash utilities with logging, validation, and safe failure behavior
• Reusable Ansible roles for RHEL configuration and compliance
• Sanitized Linux troubleshooting case studies
• Architecture diagrams and recovery runbooks
• Interview-ready demonstrations of enterprise Linux problem-solving

🤝 Professional Focus I am interested in senior and principal-level Linux systems administration, Linux engineering, platform operations, infrastructure security, and automation opportunities; particularly remote roles and opportunities in New Hampshire and Massachusetts.

Portfolio Principles Every project on this profile is built with synthetic data and lab infrastructure. Organization names, internal systems, credentials, network details, tickets, and proprietary configurations are never published.

Building reliable Linux systems—and documenting the work so others can repeat it.