Linux Systems Administrator Resume
5.00/5 (Submit Your Rating)
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.