Senior Linux System Administrator

Irving, TX - USA

Monthly Salary: Not Disclosed

Posted on: 3 hours ago

Vacancies: 1 Vacancy

Job Summary

ob Title: Senior Linux System Administrator (L3)

Role Summary

Seeking a hands-on L3 Linux Administrator to own stability availability and performance across large-scale Linux environments. The role demands deep troubleshooting skills strong exposure to Veritas Clustering (VCS) SAN/NAS storage and close coordination with data center teams for hardware incidents. The ideal candidate will work independently lead incident resolution and improve BAU operations through automation and best practices.

Key Responsibilities

Linux Administration (L3)

Administer and troubleshoot RHEL Oracle Linux CentOS SUSE in production.

Diagnose complex OS issues: kernel panics boot/GRUB failures filesystem corruption resource contention (CPU/RAM/I/O/Network) SELinux/AppArmor denials.

Patch and upgrade OS at scale; manage package repositories and kernel updates with rollback strategies.

Implement and audit security hardening (firewalld/iptables CIS benchmarks PAM sudo SSH auditd).

Manage system services (systemd) cron/timers users/groups sudoers and system-wide configuration.

Veritas Cluster Server (VCS/InfoScale)

Install configure and administer VCS for HA/DR across multi-node clusters.

Create/maintain service groups resources dependency trees; configure LLT/GAB I/O fencing and quorum.

Integrate VxVM/VxFS (disk groups volumes file systems) with application failover.

Conduct DR drills failover testing and root cause analysis for cluster events.

Storage: SAN & NAS

Liaise with storage teams for LUN provisioning zoning masking; validate multipathing (DM Multipath/PowerPath).

Build and maintain filesystems (ext4/xfs/VxFS) mount policies fstab and autofs.

Manage NFS/CIFS/SMB exports/mounts permissions quotas and locking issues.

Troubleshoot pathing latency and I/O bottlenecks using OS HBA and array-side telemetry.

Data Center & Hardware Coordination

Coordinate with DC teams for racking/stacking cabling console access and physical triage.

Diagnose hardware faults (CPU memory NIC/HBA disks/RAID/SSD backplane PSU fans) and firmware/BIOS alignment.

Raise and track OEM tickets (Dell/HP/IBM/Cisco) manage RMA and oversee replacements and post-fix validation.

BAU Operations & Incident Management

Act as L3 escalation for P1/P2 incidents; drive bridge calls and lead technical recovery.

Perform deep-dive log analysis (journald syslog dmesg audit logs application logs).

Create/run SOPs/runbooks maintain KB articles and implement problem management (RCA corrective actions).

Support on-call rotation and scheduled maintenance windows (change management CAB MOPs).

Networking (Host-Level)

Troubleshoot TCP/IP routing VLANs/bonding/teaming MTU host firewalls DNS/DHCP NTP/Chrony.

Collaborate with network teams on L2/L3 connectivity load balancers and firewall rules.

Required Experience & Skills

8 12 years in enterprise Linux system administration with proven L3 ownership.

Strong hands-on with VCS (Veritas Cluster Server) VxVM VxFS and HA/DR patterns.

Solid SAN/NAS experience: LUNs zoning multipath NFS/SMB.

Demonstrated success working independently and leading during critical incidents.

Advanced troubleshooting: kernel performance storage and cluster-level failures.

Scripting proficiency (Bash; Python preferred). Familiar with Ansible.

Familiarity with VMware/KVM and basic cloud (AWS/Azure/Linux in cloud) concepts.

Strong documentation discipline (SOPs MOPs RCAs) and ITIL-aligned processes.

Salary Range- $90000-$110000 a year

ob Title: Senior Linux System Administrator (L3) Role Summary Seeking a hands-on L3 Linux Administrator to own stability availability and performance across large-scale Linux environments. The role demands deep troubleshooting skills strong exposure to Veritas Clustering (VCS) SAN/NAS storage and c...