Manager

Tata Communications; Chennai District; On-site; INR 1,500,000 - 2,100,000; Full time

Job summary

Tata Communications is seeking a seasoned Linux and Kubernetes Administrator to join our production operations team in Chennai. You will manage Kubernetes clusters, handle escalations, run upgrades and maintenance, and ensure high availability, security, and performance across our cloud-native platforms.

The role covers troubleshooting L3 issues, incident response, and collaboration with security, networking, and storage teams to sustain 24x7 services.

Qualifications

• CKA certification preferred
• Strong knowledge of Linux administration and troubleshooting
• Kubernetes administration and L3 troubleshooting
• Virtualization like vSphere/OpenStack/Ovirt/KVM
• Production Kubernetes cluster operations and incident management
• Knowledge of Kubernetes architecture, control plane, nodes, networking, storage
• Handle P1/P2/P3 incidents within SLA
• Kubernetes upgrades, patching and maintenance
• Understanding container runtimes: CRI-O, Docker, CRI
• Experience with container registries, Harbor
• Monitoring with Prometheus, Alertmanager, Grafana
• ELK/EFK and Fluentd
• CI/CD with Jenkins and Git
• Container image build and deployment

Responsibilities

• L3 troubleshooting of Kubernetes issues
• Kubernetes upgrade and patching activities
• Cluster health checks and node/pod troubleshooting
• Control-plane and worker-node troubleshooting
• Kubernetes networking troubleshooting
• Resource and performance analysis
• Incident/problem management and RCA
• Vulnerability remediation and production change implementation
• Security and vulnerability management practices
• Customer escalations and on-call support

Skills

Linux administration

Kubernetes administration

L3 troubleshooting

Container runtimes

Harbor

Prometheus

Grafana

Jenkins

Git

CI/CD

Tools

Kubernetes

Harbor

NGINX

Kong

Redis

Kafka

Keycloak

Prometheus

Grafana

Elasticsearch

Fluentd

Alertmanager

Gatekeeper

Job description

Primary Focus: Linux Administration, Kubernetes Administration, Production Operations, SRE, Monitoring, Security, Upgrades and Customer Escalation

Mandatory Skills

• CKA certification (Preferred)
• Strong/deep knowledge of Linux administration and troubleshooting
• Strong hands-on experience in Kubernetes administration and L3 troubleshooting
• Knowledge on virtualization like vSphere, OpenStack, Ovirt , KVM
• Production experience in Kubernetes cluster operations, incident management and troubleshooting
• Strong knowledge of Kubernetes architecture, control plane, worker nodes, networking, storage and workloads
• Ability to handle P1/P2/P3 incidents and customer escalations within SLA
• Hands-on experience with Kubernetes upgrades, patching and maintenance
• Strong understanding of container runtime technologies:
• CRI-O
• Docker
• CRI
• Experience with container registries, preferably Harbor

Monitoring & Observability

• Configure and administer Prometheus
• Configure and manage Alert manager
• Grafana dashboard creation and monitoring
• Alert investigation and resolution within SLA
• Alert tuning and noise reduction
• Identify duplicate/repeated alerts and optimize alert rules
• Experience with ELK/EFK and Fluentd
• Log collection, analysis and troubleshooting

CI/CD & DevOps

Hands-on experience with:

• Jenkins
• Git
• Container image build and deployment

Responsible for:

• L3 troubleshooting of Kubernetes issues
• Kubernetes upgrade and patching activities
• Cluster health checks
• Node and pod troubleshooting
• Control-plane and worker-node troubleshooting
• Kubernetes networking troubleshooting
• Resource and performance analysis
• Incident/problem management
• Root Cause Analysis (RCA)
• Vulnerability remediation
• Production change implementation

Security & Vulnerability Management

• Kubernetes security best practices
• Vulnerability identification and remediation
• Container image vulnerability management
• Registry security
• Network/security policy concepts
• SSL/TLS certificate management
• Experience with security tools such as Gatekeeper
• Ability to coordinate vulnerability fixes across OS, Kubernetes and container layers

Networking

Strong understanding of:

• DNS
• TCP/IP and L3 networking
• Load Balancers
• SSL/TLS termination
• Ingress
• Ingress Controllers
• Service Mesh concepts
• NGINX
• Kong API Gateway

Storage

Good understanding of Kubernetes storage and underlying infrastructure:

• NFS / File storage
• Block storage
• Object storage
• PV/PVC
• Storage Class
• CSI
• Mount and I/O issues
• Storage performance concepts

Working knowledge of:

Component Required Knowledge

Service Mesh, Gateway, traffic management

NGINX

Ingress / reverse proxy

Kong

API Gateway

Redis

Database fundamentals & troubleshooting

Kafka

Messaging / event streaming

Message broker

Keycloak

Harbor

Container registry

Monitoring

Grafana

Alertmanager

Alert management

ELK

Fluentd

Customer & Operations Responsibilities

• Provide 24×7/on-call customer support as required
• Handle customer escalations at OS and Kubernetes levels
• Understand and resolve customer production issues
• Participate in incident bridges and technical discussions
• Perform RCA for critical incidents
• Track and resolve tickets within defined SLA
• Coordinate with development, compute, network, storage, security and application teams
• Ensure production changes follow the approved change-management process
• Prepare technical documentation and operational procedures