We are seeking an experienced and motivated Senior Linux Administrator to join our team. In this role, you will be responsible for day-to-day administrative tasks, configuration management, automation, and performance optimization for a Red Hat and Ubuntu-based Linux cluster, supporting both servers and workstations. You will collaborate closely with end users and core RDTE staff to ensure high cluster performance, robust infrastructure security, and seamless deployment of containerized and cloud environments.
Key Responsibilities
System Administration & Maintenance: Install, configure, maintain, and monitor software applications, operating systems, development tools, hardware, and storage systems across RHEL and Ubuntu servers and workstations. Provide secondary support for core and end-user systems as needed.
Automation & Scripting: Create custom scripts using Bash, Python, PowerShell, and other languages to streamline administrative tasks and operational management.
Configuration Management: Utilize Ansible (and other enterprise tools) to manage and automate configuration requirements across RHEL and Ubuntu systems.
Cloud & Container Infrastructure: Deploy, support, and scale cloud infrastructure, container environments, and orchestration platforms (Kubernetes, Docker, and various cloud platforms) within a DevOps framework.
Networking & Storage: Manage networking technologies including IP addressing, VLANs, trunks, LAG, InfiniBand, switch configuration, and security practices. Configure and maintain networked storage solutions such as NFS, SCSI, SAN/NAS, and SMB/CIFS.
Security & Compliance: Apply and maintain security postures using DISA STIGs for Red Hat and Ubuntu environments.
Collaboration & User Support: Partner with end users and core RDTE staff to troubleshoot performance issues related to cluster performance and submitted job execution.
Documentation: Create and maintain comprehensive technical documentation, including system configurations, Standard Operating Procedures (SOPs), end-user guides, and troubleshooting documentation.
Technical Competencies
Advanced knowledge of Linux system administration, enterprise systems, and strong troubleshooting/problem-solving skills.
Proven experience managing Red Hat-based clusters, storage, and networking.
Strong working knowledge of configuration management tools, particularly Ansible.
Hands-on experience deploying and supporting cloud infrastructure, DevOps pipelines, and container orchestration (Docker, Kubernetes).
Practical understanding of networking principles, protocols, and security practices.
Familiarity with storage protocols (NFS, SCSI, SAN/NAS, SMB/CIFS).
Working knowledge of DISA STIG implementation and system hardening.
Ability to work effectively both independently and as part of a collaborative team.
Requirements
6 to 10 years of relevant professional experience without a degree.
DoD Secret Clearance or above
DoD 8570/5239 IAT Level 3 Certification (e.g., Security X or CISSP)
