Senior Linux System Administrator

DDC IT Services is actively seeking a Senior Linux System Administrator to perform the following responsibilities:

P erform Linux technical support for Linux server systems. Manage and maintain most current version and two previous versions of Linux OS including SuSE, SuSE Linux Enterprise Server (SLES), Red Hat and Oracle Linux on physical and virtual operating environments. Provide technical oversight and consultation as required. Install, configure, maintain, manage, and troubleshoot Linux OS and associated components.

The contractor shall provide the following general system administration tasks:

• Ensure operating environments are properly configured and functioning with specified network and storage components and tool suites.
• Create and modify user accounts.
• Perform file system permissions management.
• Perform patch management and installation.
• Apply baseline security settings as defined by the DoD Operating SRG.
• Perform backups in accordance with applicable regulations, policies, and guidance and ensure backup failures are properly addressed.

• Analyze, monitor, troubleshoot, and diagnose to ensure system optimization, integrity, availability, and functionality are within prescribed parameters.
• Provide TCP/IP network management. Must understand common ports and protocols used for TCP/IP communication between servers (HTTP, SSH, SMTP, etc). Must also understand TCP/IP classless subnets using CIDR notation and establish default routes.
• Utilize industry standard tools for system management with emphasis on SSH/SCP/SFTP, BMC Bladelogic, Symantec Netbackup Enterprise or Datacenter edition.
• Shall have a basic understanding of current UNIX shells, Korn, Bourn and Cshell.

Provide the following senior system administration tasks:

• Perform volume system management utilizing LVM, Veritas Volume Manager. Perform file system tuning for UFS, Third Extended File System (EXT3), Fourth Extended File System (EXT4), Veritas File System (VxFS) and Extended File System (XFS).
• Perform network configuration and troubleshooting using TCPDump or similar tools to capture packet data for analysis. Configure host-based and network based routes. Perform NIC bonding as required. Provide support of communication protocols between IBM; Linux; Hewlett Packard equipment; web servers; various switches and routers; and the NIPRNET.
• Perform audit log configuration and analysis and rotation/retention. Perform Syslog configuration and aggregation and rotation/retention.
• Perform hardware/kernel troubleshooting and problem identification. Perform kernel tuning using configuration files and system tools. Troubleshoot the UNIX boot process for SAN booting using x86 BIOS, GRUB, and UEFI. Perform system initialization utilizing advanced Initialization systems on modern UNIX (upstart, systemd).
• Monitor security logs for errors and make corrections to improve efficiency. Responsible for loading patches and modifications to systems to enhance performance, operations and security.
• Conduct risk and vulnerability assessments of planned and installed information systems to identify vulnerabilities, risk, and protection needs. Conducts systems security evaluations, audits, and reviews.
• Perform Linux BASH and or PERL shell scripting to automate tasks as required.
• Perform disaster recovery (real or simulated) actions as required. Document detailed system recovery actions for Enterprise-wide disaster recovery documentation repository.
• Provide support for clustered environments (Oracle RAC, OCFS2, GCFS, VCS).
• Install, configure, administer and support secure remote access utilities and applications including, but not limited to, SSH, Secure Web Access, VSphere, and Remote X server access.

Qualifications:
Active Secret/IT-1 clearance.

Certifications Required:
Security +CE

Education Requirements:
Security+ CE required

Certifications Preferred:
none