Linux System Admin

Role Summary

The Linux Administrator will be responsible for installation, configuration, maintenance, security, backup, and performance of Linux servers across production, DR, and non-production environments. The role ensures high availability, system security, compliance, and operational stability.

Key Responsibilities

• Linux System Administration
• Install, configure, upgrade, and maintain Linux OS (RHEL, Rocky, Alma, Ubuntu)
• Manage server lifecycle: build, patching, decommissioning
• Kernel tuning and OS-level performance optimization
• User, group, sudo, PAM, and permission management
• Disk management: LVM, RAID, filesystem expansion
• Boot issues troubleshooting, GRUB recovery

• Security & Vulnerability Management
• Apply OS security hardening (CIS benchmarks, STIGs)
• Patch OS vulnerabilities (YUM/DNF/APT, live patching)
• Handle VAPT findings and remediation
• SELinux configuration and troubleshooting
• Firewall configuration (firewalld, iptables)
• SSH hardening, MFA integration where applicable
• Log monitoring and audit (auditd, rsyslog)

• Backup & Recovery
• Configure and manage backups using:
• Veeam / NetBackup / Commvault / Bacula / scripts
• Monitor backup success/failure
• Perform restore testing and DR drills
• Snapshot-based backups (VMware / Storage level)
• Documentation of backup & restore procedures

• Monitoring & Performance
• Configure monitoring tools (Nagios, Zabbix, Prometheus, Grafana)
• Analyze CPU, memory, disk, I/O, and network issues
• Capacity planning and trend analysis
• Proactive alert handling

• Networking & Services
• Network configuration (bonding, VLANs, routing)
• DNS, NTP, chrony, time sync with AD
• Manage services:
• Apache / Nginx
• Postfix / Sendmail
• NFS, SMB
• FTP/SFTP
• Proxy servers (Squid)

• Virtualization & Cloud (if applicable)
• VMware / KVM administration
• VM provisioning, snapshots, cloning
• Cloud Linux instances (AWS / Azure basics)
• Cloud-init and automation

• Automation & Scripting
• Shell scripting (bash)
• Automation using Ansible (preferred)
• Cron job management
• Configuration management

• Documentation & Compliance
• Maintain SOPs, build documents, and runbooks
• Support audits (ISO, SOC, internal audits)
• Change management and incident response
• Coordination with security, backup, and application teams

• Operations & Support
• L2/L3 support for Linux-related issues
• RCA for incidents and outages
• On-call support (if required)
• Coordination with vendors and OEM support

Technical Skills

• Linux OS: RHEL 7/8/9, Ubuntu, SUSE
• Filesystems: ext4, xfs
• Backup tools (any enterprise-grade)
• Security tools & concepts
• Networking fundamentals
• VMware/Linux integration
• Troubleshooting production issues

Preferred Skills

• Ansible automation
• iDRAC / iLO / IPMI
• Container basics (Docker, Podman)
• Kubernetes (basic awareness)
• PXE / Kickstart
• Patch management tools (Satellite, Spacewalk)

Experience

• 3-8 years of Linux system administration experience
• Enterprise data center or cloud environment exposure

Certifications (Good to Have)

• RHCSA / RHCE
• Linux Foundation Certified Engineer
• ITIL (basic)