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Linux Systems Administrator Resume

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Montvale, NJ

PROFESSIONAL EXPERIENCE

Confidential, Montvale, NJ

Linux Systems Administrator

Responsibilities:

  • Daily maintenance of infrastructure and fast - paced cloud-based environment
  • Daily support and maintenance of Linux infrastructure on Redhat 5/6/7 and windows 2008 and 2012
  • Some use of Python Scripting, Html, and fluency in bash shell scripting
  • Full design and migration of OMD monitoring tool Administration building manual checks with bash scripting to replace legacy Nagios and enhance monitoring checks
  • Member of Tools Team whose priority is to engineer and automate solutions for enhanced efficiency for operations 1st line
  • Research and design bash build Shell scripts, process, tracking, prepare presentation and documentation with Training to junior members
  • Collaborating with Developers playing a devops role for projects
  • Patch Management across all environments
  • Collaboration With DBA adminstrators to ensure successful deployments and adequate infrastructural/ server provisioning/configurations
  • User administration following process to ensure secure access
  • Coordination/Troubleshooting Calls/daily work with ISP Centurylink
  • Plan, Design, Document and train employees on new methods/tools in a leadership role wearing many hats
  • Exposure/Support of AWS, EC2, CloudFormation, VPC, EFS, EBS, S3, Gateway, ElasticLoadBalancer, Route53, CloudWatch
  • Some use of Python Scripting, Html, and fluency in bash shell scripting
  • Promoting code through Jenkins Automation Tool
  • Exposure to Docker, Squid, and other tools
  • High Level knowledge of ASA Firewall (working with Centurylink-ISP)
  • Kernel Tuning/Performance Tuning for database/application needs
  • Root Cause Analysis
  • Collaborating with Services teams to provide tutorial videos for client portal
  • Setting up and maintaining Qualys Tool
  • Writing Vanilla Build Scripts for supported Applications/Database
  • Powerpoint Presentations to Address Concerns and Amend current SLAS
  • Bash Scripting to create server build scripts following quality checklists and training employees on conceptual and security guidelines of builds
  • On-site technical support for clients during go live migration
  • User and group management
  • .NET GUI Configuration
  • Autosys Installations and administration for client
  • Disaster Recovery Failover/Failback
  • Geneos installation and administration for client
  • Networking configuration and troubleshooting with internet service provider
  • Firewall maintenance with internet service provider
  • Maintenance of adequate documentation
  • Installation Of Oracle Database (version 12)
  • Interface Setup
  • Use of Git to create and push projects
  • Documentation/Establishment of procedures to address existing concerns
  • Member of Tools and Build Team working on implementation of tools for improved scalability and automation of manual tasks
  • Providing weekend support when needed (i.e. migrations)
  • Assistance on Monthly Service Reports and other data analytics
  • Daily maintenance of Linux servers and troubleshooting
  • Basic Windows Administration
  • Active Directory use- creating group and adding users, establish policies
  • Creating Procedure for Windows Build and installation of applications
  • Publishing Applications and maintaining Citrix Studio for in-house applications (Xenapp 6.5 & 7.12)
  • Package Management/Patching
  • Managing Linux Infrastructure involving day-to-day maintenance of servers and troubleshooting.
  • Provisioning Red Hat Enterprise Linux Server using PXE Boot according to requirements.
  • Installing Linux (RHEL 5/6/7, CentOS and Ubuntu 12, 14) on HP blade, Dell R series servers and VMware ESXI 5.5/6.0 using PXE with kickstart
  • Red Hat Satellite Environment for Patching, Subscription Management, Configuration, Software management, Storage Management,
  • Utilizing OpenSCAP application auditing tool as a standardized compliance scan for Linux-infrastructure, expressing checklist content for examining system for security compromises based on rule based specifications
  • Vulnerability Management with openSCAP scans analyzing qualys report
  • Bash Scripting skills for creating menus, automating daily tasks, monitoring CPU usage, user management, creating backups
  • Installing/Upgrading Puppet Enterprise Automation tool
  • Use puppet for managing the infrastructure, configuration, user management, file system management, monitoring, server provisioning with manifests
  • Exposure to Ansible
  • Utilizing Vmware with creating virtual machines, cloning virtual machines using Vcenter, snapshots, Vsphere as well as Vmotion
  • Responsible for upgrading the Virtual Machines, VMware ESXi hosts and vCenter servers in the organization.
  • Server migration from Physical to Virtual (P2V) and Virtual to Physical (V2P) using Vmware Vcenter Converter Standalone
  • Automating all aspects of VMware VSphere infrastructure with VMware VRealize Orchestrator
  • Experience with channel bonding utilizing multiple interfaces for increased redundancy
  • Utilizing KVM virtualization
  • Researching and recommending innovative, and where possible, automating approaches for system administration tasks.
  • Performing Red Hat Linux Kernel Tuning, memory upgrades.
  • Setting up users and groups, network configuration, password, resolving permissions issues, user and group sudo access management.
  • Performing daily administrative tasks, including log reviews, account, group, system accessibility issues, and server software maintenance.
  • Building the host using the Kick start and configuration of LVM and maintaining them.
  • Creating and managing Logical Volume using LVM to create volumes on the volume groups, and file systems, extending/reducing logical volumes and file systems.
  • Package management using RPM and YUM.
  • Maintaining the YUM repository server for patch management as well as securing Linux systems using local repository and installing, upgrading applications on Linux Systems.
  • Monitoring Netbackup queue for failed backup jobs and taking actions to fix them.
  • Managing file systems utilization using script scheduling as cron job
  • Researching and recommending innovative, and where possible, automating approaches for system administration tasks.
  • Configuring network adapters for IP addresses and resolving routing related issues
  • Resolving TCP/IP, UDP related networking issues on RHEL systems
  • Working on iLO and iDRAC setup and configuration
  • Configuring and managing VSFTP servers
  • Installing and configuring Apache and supporting them on Linux production servers.
  • Configuring multiple websites on one Apache http server using VirtualHost containers and use of basic html code for website creation on virtualhost
  • Maintaining security channels such as implementation and update of iptables rules on host-based firewall and SELinux modes
  • Setting up network environments using TCP/IP, NIS, NFS, DNS, SNMP agents and DHCP.
  • Upgrading servers (DNS, DHCP, NIS, HTTPD) and general-purpose servers using PXE-boot with kickstart
  • Providing troubleshoot of TCP/IP, Apache HTTP/s. SMTP, and DNS
  • Configuring NFS server and mount exported NFS resources at the client side. NFS Administration, exporting file systems, mounting exported file systems, working NFS daemons and fixing any mounting issues.
  • Installing and managing new servers which includes racking, stacking, cabling, running fiber and LAN patch.
  • Mounting user home directories through auto mount and setting up quota system.
  • Regular disk management like adding/replacing hot swappable drives on existing servers/workstations, partitioning according to requirements, creating new file systems or growing existing one over the hard drives and managing file systems.
  • Experience in Migrations using different software's like scripts, LVM, and rsync.
  • Installing and configuring Nagios/NRPE to monitor Linux servers.
  • Extensively used LVM - created VGs, LVs & File systems.
  • Patching linux systems using HP Server Automation tool.
  • Provisioning and configuration management for all Linux servers.
  • Server hardening, checking I/O and Memory performance.
  • Responsible for start-up and shutdown of the boxes and services.
  • Adding and configuring disks and creating new file systems.
  • Setup, install and configure samba
  • Performance monitoring with sar, iostat, iotop, vmstat, and Other Tools.
  • Installing openSSL certificates
  • Interacting with the active directory environment creating users, groups, assigning group policies to organizational units
  • Assisting with network troubleshooting including the use of the tcpdump tool and wireshark
  • Maintaining inventory of all incoming and outgoing equipment
  • Working directly with Vendor to decommission thousands of servers and networking equipment following Company rules and regulations
  • Working with vendors to replace server parts and ordering new hardware.
  • Ensuring data destructions before decommissioning assets
  • Scanning vulnerable hosts on the subnets and fixing vulnerabilities resulting in improved and secure networks using Vulnerability Management System
  • Attaching NAS, DAS storage to Linux and ESXI servers, creating standard partitions, creating physical volumes, volume groups, logical volumes and extending/reducing logical volumes
  • Solid understanding and working knowledge of storage technologies such as SAN, NAS and ISCSI
  • Providing direct user support for level 2 and level 3 issues via email and ticket system
  • Ticket assessment/prioritization on daily basis on RT platform
  • Working with different storage containers, creating RAID levels (0, 1, 5, 6, 10) to achieve redundancy and performance.
  • Working with different file systems such as ext3, ext4, xfs and NFS, partitioning using fdisk, parted to create different partitions, creating and fixing file systems.
  • Performing filesystem checks and repairing when needed
  • Monitoring and controlling system processes using top, renice, kill, etc
  • Created and managed templates in vCenter
  • Installing and configuring Linux virtual machines on VMware infrastructure.
  • Performing critical system administration tasks from Single user mode
  • Troubleshooting Linux network, security related issues, capturing packets using tools such as IPtables, firewall, TCP wrappers, NMAP.
  • Monitoring the infrastructure health using Nagios and proprietary data center monitoring tools
  • Responding to the alerts generated by Nagios such as network connectivity issues, critical system services, application availability, high CPU spikes and systems resources being maxed out.
  • Use of Nagios Network Analyzer for network analysis and potential security threats
  • Actively monitoring Systems health using Nagios products and responding to tickets generated by Nagios and users on RT platform

Confidential

Linux Technician/Operator

Responsibilities:

  • Responsible for user management.
  • Responsible for group management. Adding removing users to requested groups on UNIX platform.
  • Installing Linux and Windows OS on desktops and servers.
  • Working with LVM logical volumes, extending file systems.
  • Attaching storage to VMS.
  • Installing Oracle Database servers on CentOS
  • Building Linux and ESXI servers for application team.
  • Adding/replacing server parts working directly with Dell and HP.
  • Responsible for inventory of all the Confidential assets.
  • Decommissioning servers following corporate procedures, ensuring data destruction.
  • Installing NRP and Backup clients on all the hosts.
  • Monitoring the health of systems and escalating issues to senior team members.
  • Assisting senior team members in various Linux related projects.
  • Responsible for keeping internal Wiki pages up to date.

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