DevOps

 Core Linux System Administration

• Install, configure, and maintain Linux servers (Oracle Linux, RHEL, CentOS, Ubuntu, etc.).
• Manage users, groups, filesystems, partitions, LVM, and permissions.
• Apply system patches and kernel upgrades.
• Maintain services like SSH, DNS, NTP, DHCP, FTP, NFS, etc.

 Package & Service Management

• Use package managers (yum, dnf, apt) to install and manage software.
• Configure and maintain application and database servers (Apache, NGINX, MySQL, PostgreSQL, etc.).

 Security & Compliance

• Secure servers via firewalls (iptables, firewalld, nftables).
• Perform system hardening and vulnerability mitigation.
• Configure SELinux, audit logs, and security tools.
• Enforce compliance with security policies and best practices.
• Support Security Tools installation and troubleshooting like EDR, Antivirus and Malware.

Backup, Recovery, and DR

• Implement and monitor backup strategies using rsync, tar, Bacula, or enterprise tools.
• Perform disaster recovery testing and scripting.

Monitoring & Performance

• Monitor systems using tools like Nagios, Zabbix, Prometheus, or Grafana.
• Tune Linux performance parameters (CPU, memory, disk I/O).
• Analyze logs using journalctl, syslog, ELK Stack, or Graylog.

 Automation & DevOps

• Write Bash/Python scripts for routine tasks and automation.
• Implement configuration management via Ansible, Puppet, or Chef.
• Support CI/CD processes with Jenkins, GitLab CI/CD, etc.

 Kubernetes (K8s) Responsibilities

• Deploy and maintain Kubernetes clusters (using kubeadm, K3s, RKE, or managed services like EKS/AKS/GKE).
• Manage containerized applications using Docker and Kubernetes.
• Monitor Kubernetes clusters with Prometheus, Grafana, and Kube-state-metrics.
• Implement Helm charts for application deployment.
• Configure networking (CNI plugins like Calico/Flannel), ingress controllers (NGINX, Traefik), and service discovery.
• Manage secrets and config maps, RBAC, namespaces, and quotas.
• Handle persistent storage (using NFS, Ceph, or CSI drivers).
• Troubleshoot pods, nodes, and deployments using kubectl, logs, and metrics.
• Automate deployments via GitOps tools (ArgoCD, Flux).
• Enforce policies using tools like OPA/Gatekeeper.
• Participate in cluster scaling, upgrades, and capacity planning.

 Documentation & Support

• Document Linux and Kubernetes system architecture, procedures, and changes.
• Provide L2/L3 support for production systems and container workloads.
• Mentor junior admins and participate in on-call rotations.