VARUN KUMAR

System Administrator

• Job Details:Experience in installing, upgrading, configuring, maintaining troubleshooting Red Hat Enterprise Linux, CentOS, Debian, Ubuntu servers on AWS, virtual (VMware), physical (IBM, HP, and Cisco hardware) environments. Administrating the user access using Free IPA and granting file permission, ACL. Experience in monitoring system resources, reporting file system, disk usage, swap and memory usage, process monitoring, performance tuning, reporting network and log management, modifying kernel parameter and kernel upgrade to avoid performance issues. Manage systems routine backup, sudo users, scheduling jobs, enabling cron jobs, enabling system logging and network logging of servers for maintenance. Experience in all kind of operational work in Linux environment and configure & manage SSH, LVM, FTP, SFTP, NTP, NFS, HTTP, Samba, TCP/IP in Linux. Managing DNS via CSC domain controller and AWS Route 53. Troubleshooting the server failures & crashes and carrying out failure recovery. Patching, upgrading and installing software packages on servers using RedHat Satellite Server and local repository servers using RPM and YUM. Hardening of servers has been done based on client requirements. Wrote shell scripts for various system tasks such as back-ups, collecting and sorting logs, installation and monitoring. Written the script to clean up the disk based on the file aging. Configuring network bonding and troubleshooting network issues. Worked on deployment & decommission VMs in cloud environments. Installation and configuration MySQL on Linux servers.

Senior Consultant

• Job Details:Management and administration of AWS services (EC2, Auto Scaling, ELB, S3, EFS, EBS, VPC, Glacier, CloudTrail, CloudWatch, Route 53, RDS, Dynamo DB, SNS, SQS, IAM, AMI). Increasing EBS backed volume storage capacity when the root volume is full using AWS EBS volume feature. Experienced in monitoring metrics on EC2, EBS, Elastic Load Balancer, RDS using CloudWatch. Experience in backup services like EBS snapshots, S3 backups and Amazon Glacier. Used Gzip with AWS CloudFront to forward compressed files to destination node/instances. Implemented and managed multi-container applications using Docker Compose, enhancing development and testing workflows. Containerized various legacy applications using Docker, ensuring consistent environments across development, testing, and production, reducing deployment time by 50%. Knowledge on Docker images, volume, networking, swarm, and resource allocation. Deployed and managed microservices architecture on Kubernetes, improving scalability and resilience. Install, creating, configure and working native Kubernetes, pods and containers, network policy providers, Kubernetes scheduler, Kubernetes storage. Utilized Helm charts for Kubernetes application management. Implemented monitoring and logging for Kubernetes clusters using Prometheus and Grafana, enhancing observability and performance tuning. Deployed and managed applications on Kubernetes clusters, improving system reliability and uptime. Experience in setting up monitoring and alerting, perform troubleshooting the Linux server on AWS based on the alerts in Zabbix, Nagios XI, Manage Engine IT 360. Reduced Service Now backlog tickets by resolving efficiently and also appreciated for my work. Provide technical support by troubleshooting day-to-day issues with various servers on different platforms.

Technology Analyst

• Job Details:Experienced in managing EC2, EBS, ELB, Route53, AMI, snapshot, IAM, RDS, CloudWatch. Working on hardening EC2 instances with security patches after launching. Experience in managing and maintaining IAM policies for organizations in AWS to define groups, create users, assign roles and define rules for role based access to AWS resources and multi-factor authentication. Initiating alarms in CloudWatch service for monitoring the server's performance, CPU utilization, disk usage etc. to take recommended actions for better performance. Enabling VPC peering between 2 VPC's in AWS and worked on AWS security of VPC’s using NACL’s and security group’s as per the compliance policies. Configured the storage on S3 buckets and S3 backups using versioning enable and moved objects to Amazon Glacier for archiving purpose. Utilized Amazon Route53 to manage DNS zones and also assign public DNS names to ELB IP's. Managed version control and collaboration through Git, resolving conflicts and maintaining code integrity. Experience in Git commit, push/pull, fetch, stash, log, branch, merge & reset. Led version control practices using Git, improving team collaboration and code quality. Wrote and maintained Ansible playbooks for configuration management, monitoring, automating tasks, logging and patching across hundreds of servers. Automated routine task and deployment processes with Ansible to reducing manual errors and deployment times, resulting in a 40% reduction in manual intervention.