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)