Dhananjay Kumar

– Architected and operated carrier-grade OpenStack telecom infrastructures across 20+ RHOSP clusters, enabling elastic compute, SDN networking, and Ceph-based distributed storage scalability. – Led hardware integrations and lifecycle operations including cluster scale-in/scale-out, hypervisor tuning, and network acceleration using DPDK, SR-IOV, OVS/OVN for high-throughput, low-latency telco workloads. – Managed OpenShift containerized applications for telecom CNFs (Cloud-Native Network Functions), ensuring multi-tenant isolation, orchestration, and lifecycle management. – Directed minor and major RHOSP16/17 upgrades, implementing rolling upgrade strategies, HA clustering, and zero-downtime migrations to maintain SLA compliance. – Implemented DevOps practices (GitOps, CI/CD automation, Infrastructure as Code) to enhance deployment reliability, consistency, and operational agility. – Automated infrastructure provisioning and configuration management using Ansible, Terraform, and Heat templates, reducing manual intervention and accelerating time-to-market. – Designed and maintained CI/CD pipelines for cloud services and internal applications using Git, GitLab CI/CD, and Jenkins, integrating automated testing, security scans, and container image management. – Conducted periodic capacity planning and performance optimization reviews, leveraging Prometheus/Grafana monitoring, resource utilization analytics, and FinOps frameworks to improve cost-efficiency and scalability across customer environments.

– Administered and optimized OpenStack infrastructures for 100+ enterprise customers, covering installation, upgrades, HA clustering, and troubleshooting across multi-tenant environments. – Delivered multi-OS support (RHEL, Ubuntu, CentOS) and Kubernetes orchestration on OpenStack and bare-metal platforms, enabling cloud-native workloads and CNF deployments. – Designed and implemented system automation and cloud management processes to improve operational efficiency and reduce time-to-market for deployments. – Supported critical service requests, incidents, and changes following ITIL practices, ensuring SLA adherence in global customer engagements. – Operated within diverse hardware ecosystems (IBM, HP, Dell) and contributed to cross-functional initiatives involving cloud security, monitoring, and compliance.

– Manage 9 different OpenStack setups (regions) spread across the globe. – Demonstrated expertise in performing Openstack Private Cloud Transition for Global client (BMW). – Handling around 11000+ Linux servers and all their OS lifecycle management, patching, kernel tuning, and performance optimization. – Supported network services (DNS, DHCP, NTP, SMTP/IMAP/POP3) and security hardening (SELinux, App Armor, RBAC) to ensure compliance and resilience. – Provide support across multiple accounts, handling both physical and virtual server provisioning.

– Delivered enterprise UNIX/Linux operations for global clients (Dow Jones, Johnson & Johnson), providing 24x7 L3/L4 support across mission-critical systems. – Administered datacenter operations including Linux server provisioning, OS patching, PCI/SOX compliance, and storage management using LVM, VxVM, HDLM, and multipath SAN technologies. – Built and maintained physical and virtual servers (VMware ESX, KVM), including firmware upgrades, hardware lifecycle management, and performance tuning. – Implemented automation scripts (Shell, Perl, Python) to streamline system administration tasks and reduce manual overhead. – Supported disaster recovery planning, backup strategies, and high-availability clustering to ensure business continuity.

– Linux Mail Server installation (Qmail, Sendmail, Postfix, Exim). – Handle antivirus, antispam, Spam Assassin, ClamAV, SquirrelMail, configuration, administration, VpopMail, MUA, MTA, and mail routing protocols. – Managing backups of various servers with LEGTO. – Used various web-based admin panels like cPanel and Hosting Controller. – Configuring a full server (Web, Mail, DNS, and Database) independently by installing the entire main and supporting software.