John Kratz
UNITED STATES NAVY RESERVES
Lutz,FL
1
Certification
14
years of professional experience
Dynamic Linux professional with a proven track record in system administration and technical support, specializing in the management and maintenance of robust server infrastructures that prioritize high availability and security. Expertise in troubleshooting complex Linux environments ensures seamless operations and minimal downtime, while a strong focus on system stability, security, and performance optimization drives reliable results. A collaborative team player adept at working with cross-functional groups to adapt to evolving requirements and deliver effective solutions. Proficient in shell scripting, network configuration, and system automation to streamline processes and improve overall efficiency.
Work History
Linux System Administrator
3 Years 3 Months- Administered and maintained 100+ Red Hat Enterprise Linux servers across multiple domains in a highly available VMware virtualized environment.
- Performed system provisioning, hardening, patching, and performance tuning for enterprise grade Linux infrastructure utilizing Ansible AWX playbooks.
- Integrated Linux servers with Active Directory to centralize authentication and access control, implementing group-based access via AD security groups to enhance security management.
- Deployed and managed LDAPS certificates, securing LDAP communications between Linux systems and AD to protect sensitive data during authentication.
- Configured OpenSSL and managed local trust stores, enabling secure LDAPS connections for SSH services to ensure data integrity during remote access.
- Provisioned, cloned, and managed virtual machines using VMware vSphere, ensuring optimal resource allocation and uptime.
Information System Technician | Cyber Incident Handler
8 Years 11 Months- Documented incident timelines, technical findings, and response actions, enhancing post-incident reviews and ensuring compliance
- Performed root cause analysis and lessons learned reviews post-incident, recommending and implementing improvements to strengthen overall security posture
- Analyzed log data from firewalls, IDS/IPS, endpoint protection, and cloud environments, identifying anomalies and indicators of compromise to strengthen security measures
- Conducted proactive network scans and asset discovery using Nmap, feeding results into ELK for enrichment and long-term storage.
Information System Technician | System Administrator
5 Years- Installed applications, troubleshot user issues, and trained users on computer hardware and software use to enhance operational efficiency.
- Enforced security best practices, including user access controls, patch management, and regular system audits.
- Administered user and group accounts within Active Directory, managing account lifecycle and group memberships to meet mission requirements.
- Monitored and maintained system logs, ensuring the accurate tracking of events and activities to support compliance, security monitoring, and proactive issue resolution
- Executed data recovery operations, restoring critical system data from backups to ensure mission readiness following system failures or data loss events.
- Enforced security best practices through user access controls, patch management, and regular system audits to maintain system integrity and compliance.
Education
Bachelor of Cloud Computing - Cloud Computing
Relevant Coursework: IT Infrastructure; Network Management; Operating Systems; Linux Administration; Computer Programming and Coding; Cryptography; Cybersecurity Concepts; Risk Management; Infrastructure as Code; Project Management
Skills
Linux server management
Server administration
Disaster Recovery Planning
Web administration
Bash automation
Secure Communications
Firewall configuration
Patch management
Incident response
Linux administration
Ansible AWX
VMware Management
Certification
- ITILv4
- CompTIA A+
- CompTIA Net+
- CompTIA Sec+
- CompTIA Cloud+
- CompTIA Project+
- AWS Cloud Practitioner
- AWS Cloud Solutions Architect Associate
- AZ-900
- AZ-104
- AZ-204
- Linux LPI Essentials
- Top Secret/SCI Clearance
Timeline
Linux System Administrator
VENATORE
05.2023 - CurrentRead More
Information System Technician | Cyber Incident Handler
UNITED STATES NAVY RESERVES
09.2017 - CurrentRead More
Information System Technician | System Administrator
UNITED STATES NAVY
09.2012 - 09.2017Read More
WESTERN GOVERNORS UNIVERSITY
Bachelor of Cloud Computing from Cloud Computing
Read More