Context:career
Cluster:Berkay Güçlü
User:Linux System Administrator
Location:Ankara, Turkey
<d>Describe<l>Logs<s>Shell<y>YAML<?>Help<ctrl-d>Delete
Describe(experience/linux-system-administrator-ozgur-yazilim-a-s)Name:Linux System Administrator
Namespace:experience
Node:Özgür Yazılım A.Ş. / Remote
Start Time:June 2022 – Present
Status:Running
Events:
TypeReasonMessage
NormalDoneDesigned, deployed and managed highly available and scalable Kubernetes (RKE2, OpenShift, Talos Linux) cluster architectures; deployed and operated services such as GitLab, Jenkins, SonarQube, Nexus, Keycloak, Rocket.Chat, Jitsi, Nextcloud and OpenSearch on Rancher, and configured Longhorn backups.
NormalDoneInstalled, maintained and optimized Red Hat and Debian based Linux servers for clients across various industries and scales.
NormalDoneImplemented server security, user authorization and system update policies; set up intrusion detection with Wazuh and OSSEC and vulnerability scanning with Nessus, and defined server hardening and firewall standards.
NormalDoneDeployed Keycloak in high availability and integrated SSO with GitLab, Zabbix, Nextcloud and Rocket.Chat; provided centralized identity management with OpenLDAP.
NormalDoneBuilt a HashiCorp Vault cluster backed by Consul; implemented secret injection into Kubernetes pods with Vault Agent and the Zabbix–Vault integration.
NormalDoneDesigned and managed virtualization platforms based on KVM/QEMU, VMware and Proxmox, including resource planning and high-availability configurations.
NormalDoneProvided load balancing and high availability with Keepalived + HAProxy clusters and Envoy proxy.
NormalDoneAutomated maintenance, monitoring and deployment processes with Bash and Python, and built custom tools to reduce manual operations.
NormalDoneBuilt fully automated CI/CD pipelines integrating Jenkins, SonarQube and Nexus, using Jenkins Configuration as Code and containerized jobs, and added code quality and security analysis with Fortify SCA and Dependency-Track.
NormalDoneSet up PostgreSQL automatic failover with Patroni and Consul and disaster recovery with repmgr and Barman; managed Valkey Sentinel, Redis Cluster and MongoDB replica sets, and ran backup and migration work for databases including MySQL.
NormalDoneMigrated from Elasticsearch to OpenSearch with cross-cluster replication (CCR) for disaster recovery; upgraded Graylog clusters from 2.x to 7.x and built log collection with Logstash, Nxlog and Graylog Sidecar.
NormalDoneDeployed and managed Kafka and RabbitMQ clusters, and built a disaster recovery setup for Kafka based on cross-cluster replication with MirrorMaker.
NormalDoneInstalled and maintained management and monitoring tools such as Zabbix, Graylog/Rsyslog, Bacula and GitLab.
Describe(experience/part-time-technical-staff-ege-university)Name:Part-Time Technical Staff
Namespace:experience
Node:Ege University / İzmir
Start Time:November 2021 – June 2022
Status:Completed
Events:
TypeReasonMessage
NormalDoneDiagnosed and repaired computer hardware and software issues and provided end-user technical support.
NormalDoneInstalled and configured network devices (routers, switches, access points, firewalls) and built and maintained LAN infrastructure.
NormalDoneInstalled and managed Windows Server 2012 R2 and 2016 environments, thin client and terminal systems.
Describe(projects/homelab-personal)Name:Personal infrastructure (homelab)
Description:Infrastructure I built from scratch and keep evolving on a single Proxmox VE host to run my own services. This site runs on it too.
Containers:
- 3-node RKE2 Kubernetes cluster on Proxmox VE 9, with kube-vip API VIP, Longhorn distributed storage and Traefik ingress.
- SNI-based routing with HAProxy; automatic certificates with cert-manager and Let's Encrypt DNS-01.
- Self-hosted mail server with Stalwart (SPF, DKIM, DMARC, reverse DNS) and webmail.
- Metrics with VictoriaMetrics, node-exporter and Grafana; monitoring and alerts with Uptime Kuma and ntfy; image update tracking with Diun.
- Local LLM server with llama.cpp and Open WebUI; Python automation that summarizes daily system reports.
- DNS-over-TLS with AdGuard Home and encrypted backups with restic.
Describe(teaching/ozgur-yazilim-a-s)Name:Özgür Yazılım A.Ş.
Schedule:—
Jobs:
- Linux System Administration 101-102-103-104
- Kubernetes 101
- Jenkins Workshop
- Ansible Workshop
Describe(teaching/mustafa-akgul-free-software-camps)Name:Mustafa Akgül Free Software Camps
Schedule:2023 – 2025
Jobs:
- Log Management and Analysis with Graylog
- GNU/Linux System Administration (Level 1)
- Server and Service Monitoring with Zabbix
- Kubernetes and Container Technologies
Describe(education/computer-programming)Name:Computer Programming
Node:Ege University
Start Time:2020 – 2022
ConfigMap(kube-system/skills)Data
linux:Debian, Red Hat / Rocky, Ubuntu, openSUSE, Arch, systemd, SELinux, firewalld
containers:Docker, Kubernetes, RKE2, OpenShift, Rancher, Talos, k3s, kubeadm, Helm, Longhorn
virtualization:KVM/QEMU, Proxmox VE, VMware, VirtualBox
automation-ci-cd:Bash, Python, Ansible, Jenkins, GitLab, SonarQube, Nexus, Dependency-Track
monitoring-logging:Zabbix, Grafana, Graylog, Rsyslog, VictoriaMetrics, Logstash, Kibana, OpenSearch Dashboards, Nagios XI, Sentry
identity-security:Keycloak, HashiCorp Vault, OpenLDAP, Wazuh, OSSEC, Nessus
databases:PostgreSQL, MySQL, MongoDB, Patroni, repmgr
search-cache-messaging:OpenSearch, Elasticsearch, Redis, Valkey, RabbitMQ, Kafka
web-application-servers:Apache, Nginx, PHP-FPM, Tomcat, WildFly
backup-storage:Bacula, Barman, MinIO
networking:TCP/IP, DNS, PowerDNS, HAProxy, Keepalived, Envoy, WireGuard, OpenVPN, Let's Encrypt
languages:Turkish — native · English — B2
# System Administrator specializing in Linux and Kubernetes-based infrastructures, with a strong focus on automation and observability. Experienced in designing and managing reliable, scalable and sustainable systems for customer environments of every scale. Continuously improving my technical skills by closely following industry developments.
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