Linux Operation 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., * 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.

• 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., * Education: Bachelor's 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.

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