Linux-L3 Professional

Key Responsibilities System Administration

• Install, configure, and maintain Linux systems (e.g., RHEL, CentOS, Ubuntu, Debian).
• Perform regular system updates, patching, and kernel upgrades.
• Manage user accounts, permissions, directories, and system policies.

Server Infrastructure Management

• Monitor system performance and ensure high availability across environments.
• Configure and maintain web servers, DNS, DHCP, NTP, SSH, and other system services.
• Manage storage solutions, RAID configurations, and file systems (ext4, xfs, LVM).

Security Compliance

• Implement and maintain system hardening (firewalls, SELinux/AppArmor, auditing).
• Manage security patches and vulnerability remediation.
• Monitor logs for unusual activity and respond to security incidents.

Networking

• Configure network interfaces, routing, firewalls (iptables/nftables), and load balancers.
• Troubleshoot connectivity issues at OS and network levels.

Automation Scripting

• Develop automation scripts using Bash, Python, or Ansible.
• Create automated tasks for backups, deployments, system checks, and monitoring.

Backup Recovery

• Configure and manage backup solutions, snapshots, and disaster recovery procedures.
• Ensure data integrity and recoverability.

Monitoring Troubleshooting

• Use tools like Nagios, Zabbix, Prometheus, or Grafana for system monitoring.
• Diagnose and resolve hardware, software, and performance issues.

Documentation Collaboration