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Senior Linux System Administrator Resume

WORK EXPERIENCE:

Confidential

Senior Linux System Administrator

Responsibilities:

  • Responsible for planning, configuring, and deploying Linux hosts across multiple environments and data centers.
  • Serve as POC for on - boarding software/hardware projects into existing data centers
  • Develop strategies to improve existing infrastructure
  • Support over 2000 virtual Linux servers and workstations in a 24x7 operational environment
  • Troubleshoot and resolve tickets generated by both phone calls and emails
  • Mitigate security vulnerabilities by patching and updating servers on a set schedule
  • Keep servers consistent across deployments with puppet
  • Provide support for AWIPS II systems
  • Support the testing of CAC authentication on both the VPN, and Linux workstations

Confidential

Senior Linux System Administrator

Responsibilities:

  • Support all Linux environments across all datacenters
  • Responsible for maintaining patch level and security on all Linux hosts
  • Work with application owners and middle tier to migrate development applications into a production environment
  • Deploy, setup and configure new Linux servers as needed
  • Plan, configure, test and implement centralized patch and configuration management server for all Linux environments
  • Setup, configure, test and maintain centralized shared jailed sftp access server
  • Mitigate all security vulnerabilities on Linux hosts
  • Tested and configured PIV(smart card auth) access over ssh for all production Linux hosts

Confidential

Senior Linux System Administrator

Responsibilities:

  • Plan and architect methodology to migrate existing infrastructure from RHEL to CentOS where needed
  • Create baseline security for CentOS deployments
  • Research and develop a plan to deploy servers in multiple datacenters as well the AWS environment

Confidential

Senior Linux System Administrator

Responsibilities:

  • Support all Linux servers (physical and virtual) and workstations in a 24x7 operational environment
  • Maintain all non-operational servers and workstations; including hardware and software
  • Responsible for AWIPS II testbed system (NTBN) as well as both operational systems, OPCN and HPCN
  • Create software repositories of baseline packages merged with branch-created content
  • Maintain and support key baseline software (ie Satellite server, Kickstart installs, puppet)
  • Resolved customer support requests from either customer emails or monitoring software
  • Architect/Design server hardware and storage solutions per the customer’s needs
  • Perform security scans of newly created images to test for integrity
  • Support for several different services including but not limited to; dns, httpd, listsrv(mailing lists), ldap

Confidential

Senior Linux System Administrator

Responsibilities:

  • Support all Linux servers, including NFS mounted storage, development/creation (hudson/trac/svn), and Mag development software
  • Responsible for AWIPS II testbed system (NTBN) as well as both operational systems, OPCN and HPCN
  • Create software repositories of baseline packages merged with branch-created content
  • Maintain, test, configure, and install branch-created software on the testbed system
  • Configure, test, and deploy workstations for the production AWIPS II systems
  • Convey needs of the programmers to NCO staff regarding local workstation needs
  • Key team member that planned, organized, and eventually moved all three AWIPS II systems to the new facility

Confidential

Senior Linux System Administrator

Responsibilities:

  • Provided system administrator support for all NHGRI Linux servers and workstations
  • Provided HPC system administrator support for the larger Beowulf cluster and the newer SGE cluster
  • Configured and maintained all web servers
  • Configured, tested, and managed software installs (typical and custom)
  • Served as communication conduit between programmers and network operations central staff
  • Planned, tested, and introduced new systems into the infrastructure
  • Worked with other administrators to strategize and improve systems/productivity
  • Maintained security and mitigated threats as new ones were identified

Confidential

Linux System Administrator

Responsibilities:

  • Administered and supported all production and non-production workstations and servers on a daily basis
  • Resolved customer support requests from either customer emails or monitoring software
  • Responsible for installing, configuring, and securing deployed machines throughout the enterprise
  • Communicated with end users and management regarding status and current state of the maintained systems
  • Served as lead system administrator for the Redhat Satellite server
  • Created and supported all kickstarts and post-installation scripts that were components of the initial deployment package
  • Created custom RPMs and scripts to perform tasks at regular intervals, via cron, or at system startup
  • Member of the team that set up, tested, configured, and eventually implemented into operations a Vmware virtual computing environment
  • Assisted in maintaining the Linux portion of the AWIPS workstations/networking/SAN and DHCP servers
  • Familiar with supporting multiple hardware vendors including Confidential, HP, IBM, and NetApp

Confidential

Linux/Windows/Macintosh System Administrator

Responsibilities:

  • Supported 200 scientists in both desktop and server side environments
  • Oversaw purchasing and procurement with all new desktops and server class hardware
  • Key team member that built a 200-node Beowulf cluster from scratch
  • Supported most hardware, ranging from machines built from parts to high-end Confidential Poweredge servers
  • Maintained high availability systems for both web and email servers
  • Provided support for IDL, MATLAB, ENVI and multiple compilers
  • Installed and supported email and web packages, including; Apache, PHP, sendmail, MySQL, spamassassin, clamav, squirrelmail, and mailscanner
  • Experienced with NFS, autofs, iSCSI, and basic DNS (bind) configurations and implementations
  • Responsible for most card installs and network configurations
  • Performed scheduled security scans and patched machines as needed. Also maintained system compliance with NASA/NIST guidelines
  • Supported smaller group of 30 Macintosh users, which included desktop troubleshooting and resolving hardware and operating system issues

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