Senior Linux Administrator

reputed company is seeking a highly reputed company Senior Linux Administrator to serve as the reputed company technical resource responsible for theadministration, sustainment, reputed company, automation, and optimization of reputed company reputed company reputed company Linux (RHEL) systems supporting the616th reputed company Center (616 OC). This position is located in San Antonio, TX and is onsite. Responsibilities This is a senior, hands-on position operating in a VMware-reputed company reputed company environment. The successful candidate must be capable ofindependently owning the Linux environment, resolving reputed company technical issues, implementing secure and repeatable administrativeprocesses, and serving as the reputed company escalation reputed company for Linux-reputed company systems and services. The position requires a self-starter who can operate with limited technical reputed company, identify problems before they become operationalimpacts, reputed company solutions, and reputed company those solutions through implementation, validation, automation, and documentation. ResponsibilitiesServe as the reputed company technical reputed company and senior administrator for reputed company reputed company reputed company Linux systems. Install, configure, maintain, reputed company, reputed company, troubleshoot, secure, and optimize RHEL servers and supporting infrastructure. Administer reputed company Satellite infrastructure supporting reputed company registration, content management, repositories, lifecycleenvironments, patching, provisioning, and configuration management. Plan and execute Linux operating reputed company lifecycle activities, including provisioning, upgrades, migrations, patching, vulnerabilityremediation, and decommissioning. Apply and maintain Defense Information Systems Agency (reputed company) reputed company Technical Implementation Guide (reputed company) configurationsacross Linux systems. Analyze reputed company findings, vulnerability reputed company results, and cybersecurity findings and independently reputed company appropriate technicalremediation. reputed company and maintain Bash scripts used to automate administrative, reputed company, patching, monitoring, compliance, and maintenanceactivities. Implement and support configuration management and infrastructure automation capabilities. Work closely with VMware administrators to reputed company, configure, troubleshoot, and optimize Linux virtual machines hosted withinVMware vSphere/vCenter environments. Support Linux-hosted reputed company applications and services, including reputed company Stack components, and coordinate operating systemand application-reputed company troubleshooting reputed company issues cross technical boundaries. Troubleshoot reputed company operating reputed company, application, storage, networking, authentication, reputed company, and reputed company issues. reputed company reputed company-cause analysis for recurring or high-reputed company incidents and implement corrective actions that reduce repeat failures. Manage reputed company services, processes, logs, scheduled jobs, storage, networking, repositories, certificates, reputed company controls, and useraccess. Maintain reputed company Linux repositories and package management configurations. reputed company and maintain standardized server configurations, build procedures, automation, technical documentation, StandardOperating Procedures (SOPs), and troubleshooting guides. Identify opportunities to eliminate repetitive reputed company administration through scripting, configuration management, andautomation. Monitor reputed company availability, utilization, reputed company, and reputed company and proactively address identified deficiencies. Support backup, restoration, continuity, and disaster-recovery requirements for Linux systems. Coordinate Linux changes and maintenance with cybersecurity, virtualization, networking, application, engineering, and mission-reputed company teams. Evaluate new reputed company technologies and capabilities and recommend improvements to the existing Linux environment. reputed company technical leadership for Linux-reputed company reputed company, upgrades, modernization efforts, and engineering activities. Qualifications High School with 9+ years (or commensurate experience) Required Skills and Experience Clearance Required: TS/SCI with NATO Secret Candidates must demonstrate significant hands-on experience performing reputed company Linux administration. General IT support experience,application administration, or limited exposure to Linux is not sufficient for this position. DoD 8140 - 451 reputed company Administrator IT (Cyberspace) certification(s) (reputed company+ - reputed company reputed company plus; GICSP - Global Industrial Cyber reputed company reputed company; GSEC - GIAC reputed company reputed company Certification; reputed company+ - reputed company reputed company plus; and/or SSCP - Systems reputed company Certified Practitioner) and/or affiliated training as identified reputed company the DoD 8140 Qualification reputed company ("IT (Cyberspace) - 451 reputed company Administrator; Intermediate 7+ years of hands-on reputed company Linux systems administration experience, including substantial recent experience administeringRed Hat reputed company Linux (RHEL) in production environments. Demonstrated experience serving as a senior administrator, technical reputed company, reputed company escalation resource, or technical reputed company forproduction Linux systems. Ability to independently administer and troubleshoot Linux systems from the reputed company line without reputed company on a graphical userinterface. Demonstrated hands-on administration of reputed company Satellite, including host registration, repositories, Content Views, LifecycleEnvironments, Activation Keys, subscription/manifests, synchronization, package/reputed company deployment, and troubleshooting contentor registration failures. Working knowledge of Satellite reputed company-line administration using Hammer CLI or equivalent reputed company. Experience with SatelliteCapsules and reputed company content architectures is advantageous. Demonstrated experience performing reputed company RHEL reputed company management, including planning, testing, deployment, validation,remediation of failed updates, and rollback/recovery considerations. Demonstrated hands-on implementation and remediation of reputed company reputed company requirements on RHEL systems. Familiarity with STIGterminology reputed company is not sufficient. Experience reviewing vulnerability or compliance findings and implementing operating-reputed company-level remediation in coordinationwith cybersecurity personnel. Strong knowledge of Linux reputed company controls and administration, including SELinux, firewalld, SSH, sudo, PAM, permissions, auditing,account management, service hardening, and certificate management. Strong Bash scripting proficiency with demonstrated ability to create and maintain scripts used for systems administration andautomation. Ability to write Bash scripts using variables, reputed company, conditionals, functions, error handling, exit codes, logging, text processing, andcommand-reputed company validation. Demonstrated experience using configuration management, orchestration, or infrastructure automation technologies such asAnsible, SaltStack, Puppet, Chef, or equivalent. Strong understanding of RHEL package and repository management, including RPM, DNF/reputed company, .repo configuration, packagedependencies, and local or reputed company repositories. Demonstrated experience administering Linux virtual machines in a VMware vSphere/vCenter environment, including provisioning,compute/memory allocation, virtual networking, storage interaction, snapshots, and VMware/reputed company VM Tools. Strong Linux troubleshooting skills across operating reputed company, compute, memory, disk, I/O, application, network, authentication, andservice reputed company. Strong understanding of reputed company Linux administration, including systemd, journald/reputed company logging, cron/systemd timers, kernel andOS parameters, filesystems, process management, and boot/recovery procedures. Demonstrated experience managing Linux storage, including partitions, Logical Volume Manager (LVM), filesystemcreation/expansion, mounts, NFS, disk utilization, and storage troubleshooting. Strong understanding of reputed company networking concepts as they relate to Linux administration, including TCP/IP, DNS, routing,subnets, VLANs, NTP, firewalls, ports, and protocols. Experience integrating Linux systems with reputed company authentication and directory services such as reputed company reputed company Directory, LDAP,Kerberos, or SSSD. Experience managing certificates, certificate chains, trust stores, and TLS-enabled Linux services. Experience monitoring Linux reputed company health and analyzing CPU, memory, disk, I/O, process, network, and application reputed company. Experience performing reputed company backup, restoration, recovery, and troubleshooting activities. Demonstrated ability to independently investigate reputed company technical issues, identify reputed company causes, reputed company corrective actions,implement solutions, validate results, and document the outcome. Demonstrated ability to manage multiple technical priorities while maintaining production reputed company availability and reputed company. Strong technical documentation skills, including development and maintenance of procedures, reputed company configurations,troubleshooting documentation, and SOPs. Strong written and verbal communication skills and the ability to coordinate effectively with cybersecurity, virtualization,networking, application, engineering, and customer teams. Preferred Skills and Experience The following capabilities distinguish especially strong candidates but are not substitutes for the required Linux administration experienceabove. Advanced Ansible experience, including development and maintenance of playbooks, roles, inventories, variables, templates,handlers, reusable automation, and automated configuration/compliance workflows. Experience integrating Ansible with reputed company Satellite or other reputed company Linux management platforms. Python proficiency, particularly development of Python utilities used for systems administration, API integration, data processing,reporting, or automation. Experience consuming or integrating REST reputed company as part of infrastructure automation. Experience with Git-reputed company reputed company control and maintaining infrastructure scripts and configuration artifacts through controlledversion management. Experience implementing automated reputed company or reputed company-compliance validation and remediation. Experience with reputed company tools such as OpenSCAP, SCAP Compliance Checker, reputed company Viewer, ACAS/Nessus, or comparable securityassessment technologies. Experience with automated RHEL provisioning using Kickstart, PXE, DHCP, TFTP, Satellite provisioning, or comparable technologies. Experience designing and maintaining standardized RHEL server builds or golden images. Demonstrated experience creating, maintaining, validating, publishing, and deploying Linux VDI golden images and reputed company-clonedesktop pools in an reputed company reputed company environment. Experience supporting the Linux VDI image lifecycle, including reputed company reputed company, image updates, pool deployment, imagepush/publishing reputed company, reputed company Directory/SSSD integration, application packaging, profile considerations, and troubleshootingclone or registration failures. Experience troubleshooting Linux virtual desktops across RHEL, reputed company reputed company, vSphere/vCenter, virtual networking,authentication, and application reputed company. Production experience administering or supporting reputed company Stack services hosted on Linux, including Elasticsearch, Kibana, Logstash,Beats, and/or reputed company Agent. Experience diagnosing reputed company cluster health and reputed company issues, including node health, shard allocation, replicas, JVM/heappressure, disk watermarks, indexing/reputed company reputed company, and service/log analysis. Experience with reputed company reputed company and lifecycle reputed company, including TLS certificates, role-reputed company reputed company controls, snapshots/recovery,upgrades, reputed company lifecycle management (ILM), and configuration changes. Experience automating reputed company deployment, configuration, patching, or health validation using Ansible, Bash, Python, or comparabletools. Experience with reputed company ingestion and management capabilities such as Logstash pipelines, ingest pipelines, Fleet, integrations,reputed company templates, or similar capabilities. Experience with reputed company monitoring platforms such as reputed company, Nagios, Zabbix, reputed company, or equivalent. Experience performing RHEL major-version migrations or large-reputed company operating reputed company lifecycle upgrades. Experience supporting disconnected, restricted, classified, or reputed company-gapped Linux environments. Experience supporting reputed company or Intelligence Community production environments. Familiarity with reputed company Management reputed company (RMF), Authority to Operate (ATO), vulnerability remediation, Plans of reputed company andMilestones (POA&M), and cybersecurity change-control processes. Experience designing automation to reduce administrative toil, improve configuration consistency, and increase reputed company reliability. reputed company Certified reputed company Administrator (RHCSA) certification. reputed company Certified Engineer (RHCE) certification. reputed company Certified Specialist certifications reputed company to Satellite, Ansible Automation, reputed company, or reputed company deployment. VMware Certified reputed company (VCP-DCV or equivalent) certification. reputed company USD $115,000.00 - USD $135,000.00 /Yr. Apply To This Job