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Berkay Güçlü
Linux System Administrator · Ankara, Turkey
up 4 yr 11 mo
74 tools · 11 groups
Linux8Debian, Red Hat / Rocky, Ubuntu, openSUSE, Arch, systemd, SELinux, firewalld
Containers10Docker, Kubernetes, RKE2, OpenShift, Rancher, Talos, k3s, kubeadm, Helm, Longhorn
Virtualization4KVM/QEMU, Proxmox VE, VMware, VirtualBox
Automation & CI/CD8Bash, Python, Ansible, Jenkins, GitLab, SonarQube, Nexus, Dependency-Track
Monitoring & logging10Zabbix, Grafana, Graylog, Rsyslog, VictoriaMetrics, Logstash, Kibana, OpenSearch Dashboards, Nagios XI, Sentry
Identity & security6Keycloak, HashiCorp Vault, OpenLDAP, Wazuh, OSSEC, Nessus
Databases5PostgreSQL, MySQL, MongoDB, Patroni, repmgr
Search, cache & messaging6OpenSearch, Elasticsearch, Redis, Valkey, RabbitMQ, Kafka
Web & application servers5Apache, Nginx, PHP-FPM, Tomcat, WildFly
Backup & storage3Bacula, Barman, MinIO
Networking9TCP/IP, DNS, PowerDNS, HAProxy, Keepalived, Envoy, WireGuard, OpenVPN, Let's Encrypt
²mem · languages
Turkishnative
EnglishB2
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.
³net · contact
↑iletisim@berkayguclu.com
↓linkedin.com/in/berkay-guclu
⇄Personal Blog
Education:
Management Information Systems (Distance Education) · Ankara University · 2024 – Present
Computer Programming · Ege University · 2020 – 2022
⁴proctree · cpu lazy
PidProgramCommandUserTimeState
1000ozgurLinux System Administrator --org="Özgür Yazılım A.Ş."berkay4y4mR
  • Designed, 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.
  • Installed, maintained and optimized Red Hat and Debian based Linux servers for clients across various industries and scales.
  • Implemented 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.
  • Deployed Keycloak in high availability and integrated SSO with GitLab, Zabbix, Nextcloud and Rocket.Chat; provided centralized identity management with OpenLDAP.
  • Built a HashiCorp Vault cluster backed by Consul; implemented secret injection into Kubernetes pods with Vault Agent and the Zabbix–Vault integration.
  • Designed and managed virtualization platforms based on KVM/QEMU, VMware and Proxmox, including resource planning and high-availability configurations.
  • Provided load balancing and high availability with Keepalived + HAProxy clusters and Envoy proxy.
  • Automated maintenance, monitoring and deployment processes with Bash and Python, and built custom tools to reduce manual operations.
  • Built 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.
  • Set 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.
  • Migrated 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.
  • Deployed and managed Kafka and RabbitMQ clusters, and built a disaster recovery setup for Kafka based on cross-cluster replication with MirrorMaker.
  • Installed and maintained management and monitoring tools such as Zabbix, Graylog/Rsyslog, Bacula and GitLab.
1037egePart-Time Technical Staff --org="Ege University"berkay7mS
  • Diagnosed and repaired computer hardware and software issues and provided end-user technical support.
  • Installed and configured network devices (routers, switches, access points, firewalls) and built and maintained LAN infrastructure.
  • Installed and managed Windows Server 2012 R2 and 2016 environments, thin client and terminal systems.
1074homelabPersonal infrastructure (homelab)berkay—R
  • 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.
1111trainerTeaching --org="Özgür Yazılım A.Ş."berkay—R
  • Linux System Administration 101-102-103-104
  • Kubernetes 101
  • Jenkins Workshop
  • Ansible Workshop
1148trainerTeaching --org="Mustafa Akgül Free Software Camps"berkay2y0mS
  • Log Management and Analysis with Graylog
  • GNU/Linux System Administration (Level 1)
  • Server and Service Monitoring with Zabbix
  • Kubernetes and Container Technologies
Web designs were made with the help of a local LLM.