Assistant Manager - IT Operations & Infrastructure

The Linux Administrator (L2 & L3) is responsible for administration, troubleshooting, optimization, and engineering of enterprise Linux systems. The role involves deep OS-level expertise, automation, performance tuning, security hardening, and support of on-prem, virtualized, and cloud-based Linux environments.

L2 Technical Responsibilities

• Administer Linux servers running RHEL, CentOS, Oracle Linux, Ubuntu.

• Perform OS-level troubleshooting for:

  • CPU, memory, disk I/O, file system, and process-related issues

  • Boot issues, service failures, kernel messages, and log analysis

• Manage:

  • Users, groups, sudoers, PAM authentication

  • File systems (ext4, xfs), mounts, NFS

  • LVM (creation, extension, snapshots)

• Handle package management using yum/dnf/apt/rpm.

• Apply OS patching, kernel updates, and security fixes.

• Manage system services using systemctl, chkconfig.

• Configure and troubleshoot:

  • SSH, DNS, NTP, cron, rsyslog, logrotate

• Perform backup and restore operations using enterprise backup tools.

• Monitor systems using tools like Nagios, Zabbix, Prometheus.

• Support virtualization platforms (VMware/KVM) at OS level.

• Work on incidents, service requests, and problem tickets as per SLA.

• Provide detailed logs and diagnostics for escalation to L3.

• Architect, design, and optimize Linux infrastructure for performance, scalability, and availability.

• Perform advanced troubleshooting including:

  • Kernel panics, memory leaks, hung processes

  • Performance bottlenecks and system crashes

• Conduct Root Cause Analysis (RCA) and implement permanent fixes.

• Perform performance tuning for:

  • Kernel parameters (sysctl)

  • CPU scheduling, memory, I/O, networking

• Implement security hardening:

  • SELinux, firewall rules, auditing, CIS benchmarks

• Design and manage:

  • High Availability (HA) and Disaster Recovery (DR) solutions

  • Clustering and load-balancing setups

• Develop automation using:

  • Bash / Shell scripting

  • Configuration management tools (Ansible, Puppet, Chef)

• Support Linux systems on cloud platforms:

  • AWS / Azure / GCP

• Work with containers and orchestration:

  • Docker, Kubernetes (preferred)

• Manage OS-level compliance, vulnerability remediation, and audits.

• Lead OS upgrades, migrations, and major change implementations.

• Mentor L1/L2 teams and act as a technical escalation point.

Mandatory Skills

• Strong hands-on experience with Linux system internals

• Advanced knowledge of:

  • Process management, memory management, file systems

  • Networking (TCP/IP, routing, DNS, firewalls)

• Proficiency in shell scripting (Bash).

• Experience with system monitoring and alerting tools.

• Knowledge of backup, restore, and recovery procedures.

• Understanding of ITIL-based incident and change management.

• Linux kernel tuning and debugging

• Automation and Infrastructure as Code (IaC)

• Cloud-native Linux administration

• HA clustering and DR architecture

• Container and DevOps toolchains Certifications (Preferred)

• RHCSA / RHCE

• Linux+

• Cloud certifications (AWS/Azure/GCP)