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Linux Admin - L3 Resume

Eden Prairie, MN

SUMMARY:

  • Overall 6 years’ professional experience as Linux System Administrator, Linux/DevOps Engineer and AWS Cloud Engineer.
  • Experience in provisioning instances, deploying applications and handling resources like EC2, EBS, S3, IAM, AMI, VPC, RDS, ELB, Route 53, security groups, NACLs, Cloud Watch, CloudFormation, AWS Elemental MediaStore etc. through AWS Cloud.
  • 2+ years of experience in system automation with DevOps using CI/CD (Continuous Integration/ Continuous Deployment), Configuration Management, SCM (source Code Management), Build and Containerization tools.
  • Worked in an Agile & DevOps environments with CI/CD, Build, Source Code tools such as Jenkins, GIT/GitHub, ANT, MAVEN and Nexus repository to build, integrate and manage projects (.jar, .war &. ear) for efficient software delivery solutions.
  • Experienced in automating system admin tasks like provisioning, installing, configuring, updating and deploying services using Puppet, Chef and Ansible.
  • Involved in POC (proof of concept) to test and implement applications on Docker, a containerization tool.
  • 3+ years of experience as a Linux Engineer, worked on building, deploying and managing Web, Application and Database servers like APACHE HTTP, TOMCAT, NGINX, WebSphere, JBOSS, MySQL, Mongo DB, PostgreSQL, Oracle DB etc.
  • Extensive working knowledge on system administration tasks like OS installations (Kickstart, PXE), user/group creations, ACLs, Logical Volume Management (LVMs), Package management (RPM, YUM, apt - get, dpkg), patching (RedHat Satellite), troubleshooting network/server/application failures etc.
  • Worked mostly on Red Hat (5.x, 6.x, 7.x), Cent OS (6.x, 7.x), Ubuntu (12.x, 14.x), SUSE Linux 10.x distros and some Windows versions like Windows 2008 R2, 2012 servers on virtualization with VMWare (Vsphere Client, VCenter).
  • Efficient in handling services and/or protocols such as SSH, FTP, NFS, Samba, LDAP, DNS, DHCP, HTTP, HTTPS, SMTP, iSCSI etc.
  • Written and/or modified scripts in Bash, Python to automate day-today activities, worked on Puppet Declarative Language on Puppet, Ruby DSL while updating Chef Recipes, YAML on Ansible playbooks and JSON on CF templates.
  • Experienced in installing, configuring Veritas Clusters (VCS), HA proxy for High Availability of applications, multipathing (DM-Multipath) and performed Backup and Disaster Recovery processes using Commvault, EMC Avamar, Veritas NetBackup & System Recovery.
  • Involved in System Remediation, Migration, Patching and Decommission projects maintaining ITIL industry standards and assisted Senior Engineers in attaining project goals.
  • Experienced in Monitoring servers using Nagios XI, Splunk, Zenoss, Zabbix, ELK, escalating/troubleshooting Hardware, Software, network and Application bottlenecks using “ServiceNow”, “HPSM” and “ITSM” Service managers.
  • Extensively involved in creating documents, providing Root Cause Analysis, and 24X7 On-call support.

TECHNICAL SKILLS:

Operating Systems: Linux (Red Hat, CentOS, Ubuntu, Fedora, OpenSUSE), Windows (2008R2/ 2012).

Hardware and Storage: HPE Blade center C-7000 series, DL 380, DL 580, BL 460c and BL 660c, Dell PowerEdge 6950, M1000e, IBM Blade center HS-series/x-series, Brocade, IBM XIV, IBM ESS (Enterprise Storage Server), EMC VNX (8000, e1600), HITACHI arrays (HNAS 3000).

Networking: Ethernet, IPv4, IPv6, VLAN, TCP/IP, NTP, FTP, HTTP, HTTPS, DNS, DHCP, SSH, SMTP, POP3, IMAP, NFS, Samba, F5 Load Balancer, Cisco Routers, Switches.

Virtualization: VMware VSphere 5.5, 6, (ESXi, VSphere Client, VCenter Server).

WEB Technologies: Tomcat 7.x, 8.x, APACHE server 2.x, Nginx 3.x, WebSphere 7.x.

Database and Backup: MongoDB, MySQL, SQL Server, Oracle DB; Commvault, VERITAS NetBackup, Veritas System Recovery, EMC Avamar.

Programming Languages: Bash, Python, Ruby, JSON and YAML.

DevOps (CI/CD, CM) & AWS: Jenkins, Git/GitHub, Ant, Maven, Nexus, Docker, Chef, Puppet, AnsibleAmazon Web Services (EC2, EBS, S3, IAM, AMI, VPC, ELB, Route 53security groups, NACLs, Cloud Watch, CloudFormation, AWS Elemental

PROFESSIONAL EXPERIENCE:

Confidential, Eden Prairie, MN

Linux Admin - L3

Roles and Responsibilities:

  • Responsible for Implementing and maintaining enterprise class Linux solutions on VMware Vsphere5 virtual environment with more than 5000 servers including physical.
  • Designed, Build, deployed VMs and hardened enterprise Linux environments (RHEL 5, 6, and 7).
  • Performed Systems Management and Administration activities like applying fixes, loading the OS, resolving system issues, working with vendors to resolve Non-pros, production issues, etc.
  • Plan, install and integrate software packages (OEM, OS, etc.), performed new package installations using (YUM) and Custom RPM builds.
  • Involved in OS Patching using Red Hat Satellite and running customized patch script via Ansible.
  • Manages major platform software and operating system upgrades and maintenance of system resources to assure maximum system performance.
  • Configure and implement features on the Linux platform that improve availability, response time, and monitoring of key system metrics.
  • Support to the user community using incident and problem management tools, email, and voicemail while troubleshooting infrastructure related issues and resolve Linux support incidents, requests or tasks that are logged in CARTS+ (Service Now).
  • Provide access / permissions to specific folders, users, groups, handling NFS Servers - un-mount and re-mount issues, server restart and fix Home directory setup issues, hardware related issues, Setup “Sudo” permissions, firewall setting etc.
  • Decommissioned unutilized and legacy servers in the Non-prod and Prod environments.
  • Written, modify and managed scripts on BASH for performing day-to-day activities, patching, backup and migration work.
  • Scripts development on Puppet Enterprise, Integrating Puppet Forge Modules with roles and profiles configuration model.
  • Configuration management & migration from Open Puppet to Puppet Enterprise.
  • Managed Puppet version control using GIT, maintained separate repositories for Puppet Open Source and Enterprise.
  • Provided KT, training sessions to the offshore teams and supported them in working on Infrastructure related issues.
  • Involved in On-call support on rotational basis, provided documentation for technical processes and RCAs.

Confidential

Linux Admin

Roles and Responsibilities:

  • Performed system remediation process on more than 5000 physical and virtual Ubuntu 12.x servers to Ubuntu 14.x, migrated applications from on premise to AWS cloud and decommissioned 1000+ VMWare virtual servers.
  • Involved in security patching on both Ubuntu 12.x, Red Hat 5.x, 6.x servers and resolved security vulnerabilities.
  • Monitored applications and verified logs on servers which are running “Apache”, “Tomcat”, “Nginx”, “MongoDB”, “MySQL”, “Java”, “PostgreSQL” etc., using Nagios XI, Zenoss and log analysis via ELK stack.
  • Written Bash and Python scripts for migrating on premise applications’ data to AWS cloud (AWS Elemental MediaStore) while doing POC (Proof of Concept).
  • Assisted Senior Engineer in setting up ELK 4.0 and created new Kibana dashboards on ELK 4.0 to analyze logs (around 500MB to 1GB) of applications related to internal clients/products.
  • Worked in Agile & DevOps environments with several teams like Developers, QA, Build & Release Management, Content Distribution teams etc., to faster application/project deployments in a Continuous Delivery Pipeline.
  • Worked on CHEF, a Configuration Management tool to automate system provisioning, installing and configuring packages, services etc. on multiple Linux systems using Chef Recipes and Cookbooks.
  • Managed project builds and releases using CI/CD tools like Jenkins, Git/Git Hub, Ant, Maven and deployed projects on various non-prod and prod environments.
  • Involved in implementing & deploying applications in non-prod and prod environments with Docker containers & orchestrating them using Kubernetes as a part of Proof of Concept test.
  • Assisted Senior Engineer in creating a new infrastructure on Cloud using AWS services like EC2, EBS, S3, IAM, ELB, VPC, Route 53, Cloud Watch, Cloud Front and CloudFormation etc.
  • Created documentations for technical processes, provided RCAs, On-Call support on rotation basis.

Confidential, Macon, GA

Linux System Admin

Roles and Responsibilities:

  • Responsible for installing, configuring and managing 1500+ physical and VMWare virtual servers in Red Hat Enterprise Linux 7 (RHEL), CentOS and Ubuntu 12.x Operating Systems and supported various application stack.
  • Performed package management using RPM, YUM, Apt-get and dpkg for maintaining stability and security of the servers.
  • Installed and Configure Ansible server, managed SSH keys for client nodes and downloaded roles from Ansible galaxy and automated several day-to-day tasks.
  • Hosted several Java (J2EE) based applications on multiple Web & App servers (Nginx, Apache, Tomcat) which are deployed using customized Ansible playbooks.
  • Worked as a Jenkins admin, integrated Jenkins with Git, Ant, Maven & Nexus for Continuous Integration and deployment of projects on various environments.
  • Used Docker to provide a consistent environment for easing the application code throughout development pipeline from development end to production end.
  • Involved in implementing new cloud infrastructure with AWS Stack such as EC2, EBS, S3, ELB, VPC, IAM, RDS, SNS, Route 53, Cloud Watch, Cloud Front and Cloud Formations for designing and deploying multitude applications over cloud environment.
  • Involved in performance tuning on servers with CLI tools and monitored system performance, log management using Splunk Enterprise 6.
  • Written shell scripts with Bash, Python to automate tasks like Backup, Monitoring, verifying disk sizes, users list on server, IPtables, Checking file integrity, installing & configuring packages etc.
  • Managed Open SSL certificates for Server-Client secured communication, maintaining confidentiality, message integrity and bilateral Authentication.
  • Installed, configured and managed Veritas Clusters for various applications and implemented High Availability and Load balancing features.
  • Performed Backup and DR (Disaster Recovery) for virtual and physical servers using Veritas System Recovery.
  • Worked on Incident management tool such as HPSM to resolve/escalate incident tickets, request and change management for issues on Red Hat and Ubuntu Servers.
  • Experienced in creating Root Cause Analysis, procedural documents and 24x7 On-Call Support.

Confidential, Dodgeville, WI

System Admin

Roles and Responsibilities:

  • Responsible for managing more than 1000 physical and virtual servers in a Data center environment.
  • Installed, configured and managed Red Hat operating system on physical (HP, Dell and IBM servers), virtual (VMware EXSi, Vsphere, VCenter) environments.
  • Building Linux servers using “Kickstart”, PXE boot methods, installed & updated packages using RPM, YUM and performed Security Patching.
  • Involved in Green Field deployment, decommission of servers and implemented automation (Provisioning & deployment) using Puppet, a configuration management tool.
  • Implemented LVM, software RAID solutions (RAID-0, RAID-1, RAID-5) on volume management and enabled security with the help of IPTables, firewalld, SeLinux and TCP wrappers.
  • Configured several Linux based services such as TCP, UDP, SMTP, DHCP, BIND, LDAP, NFS, SMTP, HTTP, HTTPS, SSH, FTP, Samba and etc., on virtual machines.
  • Monitored the network and system performance and log management using Splunk Enterprise 6.
  • Extensively worked on Performance tuning with command line tools to maintain stability of servers.
  • Experienced in implementing “Multi-pathing” between HBA nodes and Storage Arrays connecting in FC-SAN, iSCSI environments which uses EMC VNX and Hitachi Storage Arrays.
  • Performed backup management, Disaster recovery using EMC Avamar tool.
  • Installed, configured and deployed web applications using APACHE, Tomcat servers and installed MySQL Database server, implemented High availability, Load balancing, Backup and Disaster recovery features.
  • Installed, configured ELK stack (Elasticsearch, Logstash and Kibana) for searching and analyzing logs on APACHE TOMCAT application server.
  • Handled or escalated tickets/issues related to servers or applications using HPSM tool and also performed change management.
  • Experienced in creating Root Cause Analysis, creating run books, and providing 24x7 On-Call Support.

Confidential

Linux System Admin

Roles and Responsibilities:

  • Responsible for managing 100+ Linux/Unix Systems in both Physical and Virtual environment and implemented virtualization with VMware ESX 4.x, Linux (Red Hat 5/6), few SUSE Enterprise Linux (SLES) 10.x servers on HP hardware attached to EMC storage box.
  • Performed storage Provisioning, Volume and Filesystem Management using LVM, and implemented RAID concepts.
  • Installed, configured packages using RPM, YUM, zypper and performed upgradation, patching works on Linux Servers.
  • Configuring and maintaining virtual server environment using VMWARE ESX, VCenter and VSphere, performed VM cloning, Templating, and VMotion activities on ESXi Clusters.
  • Experience in monitoring infrastructure with Zabbix and used CLI tools for performance Analysis.
  • Involved in storage migrations at host level using “pvmove”, “rsync”, “vgimport” and “vgexport” commands, set up migration of data centers and network renewals operations.
  • Performed Backup management and Disaster recovery operations using Veritas NetBackup tool.
  • Experienced in setting up multipathing using Redhat native Device Mapper multipath software to maintain data accessibility between Linux Servers and Storage.
  • Implemented clustering solutions for High Availability using tools such as Veritas Cluster Server (VCS).
  • Involved in setting up the environment with multiple WebSphere 7.0 application servers to deploy several Java based applications, configuring High Availability, load balancing features with HA Proxy, F5 load balancer.
  • Provided documentation, RCAs, 24x7 production support and On Call rotations.

Confidential

Junior System Engineer

Roles and Responsibilities:

  • Installed RHEL 5.x Operating System on multiple server with Kickstart, PXE boot methods. Performed Disk partitioning, LVMs, RAID implementations and Package management using Red Hat repositories i.e. RPM.
  • Installed, Configured and managed several services with protocols like DHCP, DNS, FTP, NFS, SAMBA, SMTP, SEND MAIL, LDAP and SSH etc. and worked on configuring TCP/IP network interfaces.
  • Performed Monitoring & troubleshooting using Top, VMstat, netstat, lsof, iostat, dig, route etc., backup & disaster recovery operations using tar, scp and rsync commands.
  • Installed, configured Apache, Tomcat webservers with Oracle DB servers as back end to deploy “java” based applications and implemented high availability solutions.
  • Assisted senior admins in monitored applications hosted on JBOSS with Zenoss and created shell scripts with Bash to automate daily tasks, created several Cronjobs.
  • Resolved/escalated issues with ITSM incident management tool and documented technical processes.

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