Linux Admin (1123075)

Location: Irving, TX

Salary: $100,000.00 USD Annually - $110,000.00 USD Annually

Description

Job Description: L3 Linux Administrator

Location: Irving, TX (Onsite 3 Days/Week)

Employment: Fulltime

Experience: 8–12 Years

Overview

We are seeking a highly skilled L3 Linux Administrator to support and enhance large-scale enterprise Linux environments. This role requires deep systems expertise, strong experience with Veritas Clustering (VCS), SAN/NAS storage, and hands-on collaboration with data center teams. The ideal candidate is a proactive problem-solver who can independently drive incident resolution, ensure platform stability, and improve BAU operations through automation and best practices.

Key Responsibilities

Linux Administration (L3)

• Administer and troubleshoot RHEL, Oracle Linux, CentOS, and SUSE in production environments.
• Diagnose complex OS issues: kernel panics, boot/GRUB failures, filesystem corruption, resource contention, SELinux/AppArmor denials.
• Perform OS patching and upgrades at scale; manage package repositories and kernel updates with rollback strategies.
• Implement and audit security hardening (firewalld/iptables, CIS benchmarks, PAM, SSH, sudo, auditd).
• Manage system services (systemd), cron/timers, user/group administration, sudoers, and system-wide configurations.
  
  

Veritas Cluster Server (VCS / InfoScale)

• Install, configure, and administer VCS for HA/DR across multi-node clusters.
• Build and maintain service groups, resource dependencies, LLT/GAB, I/O fencing, and quorum mechanisms.
• Integrate VxVM/VxFS for disk groups, volumes, filesystems, and application failover.
• Conduct DR drills, cluster failover tests, and analyze cluster-related incidents.
  
  

Storage Administration: SAN & NAS

• Collaborate with storage teams for LUN provisioning, zoning, and masking; validate multipathing (DM Multipath / PowerPath).
• Build and maintain filesystems (ext4/xfs/VxFS), fstab configurations, and autofs.
• Administer NFS/CIFS/SMB mounts, permissions, quotas, and troubleshoot locking issues.
• Diagnose latency, path failures, and I/O bottlenecks using OS-level and HBA/array telemetry.
  
  

Data Center & Hardware Coordination

• Work with data center teams for racking/stacking, cabling, console access, and onsite hardware triage.
• Troubleshoot hardware faults: CPU, memory, NIC/HBA, disks/RAID/SSD, backplane, PSU, fans.
• Manage OEM support tickets (Dell/HP/IBM/Cisco), RMAs, and post-replacement validation.
  
  

BAU Operations & Incident Management

• Act as L3 escalation for P1/P2 incidents; lead technical recovery and bridge calls.
• Perform comprehensive log analysis: journald, syslog, dmesg, audit logs, application logs.
• Develop and maintain SOPs/runbooks and knowledge base articles; drive RCA and corrective actions.
• Participate in on-call rotation and scheduled maintenance windows (change management, CAB, MOPs).
  
  

Networking (Host-Level)

• Troubleshoot TCP/IP, routing, bonding/teaming, MTU issues, host firewalls, DNS/DHCP, NTP/Chrony.
• Coordinate with network teams on L2/L3 connectivity, load balancers, and firewall rule updates.
  
  

Required Skills & Experience

• 8–12 years of enterprise Linux administration with proven L3-level ownership.
• Strong hands-on expertise with Veritas Cluster Server (VCS), VxVM, VxFS, and HA/DR architectures.
• Solid SAN/NAS experience: LUNs, zoning, multipathing, NFS/SMB.
• Advanced troubleshooting skills in OS, storage, performance, and clustering.
• Scripting skills in Bash (Python preferred) and familiarity with Ansible.
• Knowledge of VMware/KVM and basic cloud concepts (AWS/Azure).
• Strong documentation habits for SOPs, MOPs, RCAs, and ITIL-aligned processes.
• Ability to work independently, lead incidents, and collaborate with cross-functional teams including DC, network, and storage units.
  
  

By providing your phone number, you consent to: (1) receive automated text messages and calls from the Judge Group, Inc. and its affiliates (collectively "Judge") to such phone number regarding job opportunities, your job application, and for other related purposes. Message & data rates apply and message frequency may vary. Consistent with Judge's Privacy Policy, information obtained from your consent will not be shared with third parties for marketing/promotional purposes. Reply STOP to opt out of receiving telephone calls and text messages from Judge and HELP for help.

Contact: ssharma17@judge.com

This job and many more are available through The Judge Group. Find us on the web at www.judge.com