Linux Operation Admin

Job Title: Linux Operations Admin

Location: Dearborn MI (Onsite)

Linux L2 Operations Admin

Responsible for the end-to-end lifecycle management of Linux server infrastructure. This role focuses on maintaining system availability managing core network services (DNS NFS Mail) and ensuring the integrity of physical and virtual hardware. The candidate will act as a primary technical resource for operational stability and secure access management.

Key Responsibilities

• Server Administration: Perform daily administration of Linux distributions (RHEL CentOS Ubuntu). Manage system uptime process monitoring and general OS troubleshooting to ensure 24/7 service availability.
• Boot Prom & Bootloader Management: Manage and troubleshoot boot-level configurations including GRUB UEFI and OpenBoot PROM. Resolve issues related to kernel parameters and system initialization.
• User Administration: Handle centralized and local user account management. Configure sudoers policies SSH keys and ensure compliance with identity and access management (IAM) standards.
• OS Package Administration: Manage software lifecycles using package managers (YUM DNF APT RPM). Maintain local repositories handle dependency resolution and execute OS patching.
• Hardware Maintenance: Monitor physical server health (CPU Memory Power Supplies) via IPMI iLO or DRAC. Coordinate with vendors for hardware replacements and firmware upgrades.
• Jump Server Setup & Security: Design implement and maintain secure Jump Servers (Bastion Hosts) to provide controlled access to the internal server environment.
• NFS Management: Configure and troubleshoot Network File System (NFS) exports and mounts. Manage permissions quotas and performance tuning for shared storage.
• Sendmail Management: Administer Sendmail services including configuration of mail relays aliases and troubleshooting mail queues and delivery issues.
• DNS Administration: Manage DNS services (BIND/Named). Maintain forward and reverse lookup zones record management (A CNAME MX PTR) and ensure name resolution stability.

Technical Skills & Requirements

• Linux Expertise: Deep knowledge of Linux internals file system hierarchy and shell environments (Bash).
• Network Services: Hands-on experience configuring BIND (DNS) and Sendmail (MTA) in an enterprise environment.
• Storage Protocols: Proficiency in NFS configuration and troubleshooting network-based file sharing.
• Hardware Knowledge: Experience with enterprise server hardware (Dell HPE or IBM) and remote management consoles.
• Security: Strong understanding of SSH tunneling firewall management (IPTables/Firewalld) and secure access protocols.

Qualifications

• Education: Bachelors degree in Computer Science Information Technology or equivalent work experience.
• Experience: 3 5 years of experience in Linux-based operational support.
• Certifications (Preferred):
  • Red Hat Certified System Administrator (RHCSA).
  • CompTIA Linux.
  • Linux Professional Institute Certification (LPIC-1 or LPIC-2).

Soft Skills

• Strong diagnostic skills for resolving complex boot and connectivity issues.
• Ability to document technical configurations and maintain operational runbooks.
• Proactive approach to hardware monitoring and preventive maintenance.
• Excellent communication skills for coordinating with network and security teams.