Linux System Admin

DMart; Thane, Navi Mumbai, Meerut; On-site; INR 900,000 - 1,500,000; Full time

Job summary

DMart in Thane seeks a skilled Linux Administrator to manage Linux servers across production, DR, and non-production environments, ensuring high availability and security. The role includes OS installation, configuration, patching, and performance tuning, with emphasis on CIS benchmarks and automation.

The ideal candidate will handle backup strategies, monitoring, and incident response, and collaborate with security, backup, and application teams to maintain operational stability.

Qualifications

• 3-8 years of Linux system administration experience.
• Experience in enterprise data centers or cloud environments.
• Knowledge of RHEL, Ubuntu, and SUSE.
• Familiarity with backup and security tools.
• Understanding of patch management and CIS benchmarks.

Responsibilities

• Linux System Administration across production, DR, and non-production environments.
• Install, configure, upgrade, and maintain Linux OS (RHEL, Rocky, Alma, Ubuntu).
• Kernel tuning and OS-level performance optimization.
• User, group, sudo, PAM, and permission management.
• Disk management, LVM, RAID, filesystem expansion.
• Backups and restore testing; DR drills.

Skills

Linux System Administration

Shell scripting

Ansible automation

Troubleshooting

Networking basics

Tools

Ansible

Docker/Podman

Kubernetes (basic)

PXE/Kickstart

Satellite/Spacewalk

Job description

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)