Global view
All dashboards / Global view⟳ 1mSystem information
| Parameter | Value | Details |
|---|---|---|
| Sysadmin is running | Yes | Berkay Güçlü |
| Role | Linux System Administrator | |
| Location | Ankara, Turkey | |
| Number of hosts (enabled/disabled) | 4 | 2 / 2 |
| Number of items | 74 | 11 templates |
| Languages | Turkish — native · English — B2 | |
| Contact | iletisim@berkayguclu.com · linkedin.com/in/berkay-guclu · Personal Blog | |
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.
Host availability
2Available
0Not available
2Completed
4Total
Problems by severity
0Disaster
0High
0Average
0Warning
0Information
0Not classified
Problems
No data found.
Hosts
| Name | Role | Availability | Period | Status |
|---|---|---|---|---|
| Özgür Yazılım A.Ş. | Linux System Administrator · Remote | ZBX | 2022-06 → now (4 yr 4 mo) | Enabled |
| Ege University | Part-Time Technical Staff · İzmir | ZBX | 2021-11 → 2022-06 (7 mo) | Completed |
| Ankara University | Management Information Systems (Distance Education) | ZBX | 2024-09 → now (2 yr 1 mo) | Enabled |
| Ege University | Computer Programming | ZBX | 2020-09 → 2022-06 (1 yr 9 mo) | Completed |
Latest data
| Item | Host | Last value |
|---|---|---|
| Linux System Administrator · Özgür Yazılım A.Ş. · June 2022 – Present | ||
| 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. | Özgür Yazılım A.Ş. | OK |
| Installed, maintained and optimized Red Hat and Debian based Linux servers for clients across various industries and scales. | Özgür Yazılım A.Ş. | OK |
| 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. | Özgür Yazılım A.Ş. | OK |
| Deployed Keycloak in high availability and integrated SSO with GitLab, Zabbix, Nextcloud and Rocket.Chat; provided centralized identity management with OpenLDAP. | Özgür Yazılım A.Ş. | OK |
| Built a HashiCorp Vault cluster backed by Consul; implemented secret injection into Kubernetes pods with Vault Agent and the Zabbix–Vault integration. | Özgür Yazılım A.Ş. | OK |
| Designed and managed virtualization platforms based on KVM/QEMU, VMware and Proxmox, including resource planning and high-availability configurations. | Özgür Yazılım A.Ş. | OK |
| Provided load balancing and high availability with Keepalived + HAProxy clusters and Envoy proxy. | Özgür Yazılım A.Ş. | OK |
| Automated maintenance, monitoring and deployment processes with Bash and Python, and built custom tools to reduce manual operations. | Özgür Yazılım A.Ş. | OK |
| 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. | Özgür Yazılım A.Ş. | OK |
| 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. | Özgür Yazılım A.Ş. | OK |
| 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. | Özgür Yazılım A.Ş. | OK |
| Deployed and managed Kafka and RabbitMQ clusters, and built a disaster recovery setup for Kafka based on cross-cluster replication with MirrorMaker. | Özgür Yazılım A.Ş. | OK |
| Installed and maintained management and monitoring tools such as Zabbix, Graylog/Rsyslog, Bacula and GitLab. | Özgür Yazılım A.Ş. | OK |
| Part-Time Technical Staff · Ege University · November 2021 – June 2022 | ||
| Diagnosed and repaired computer hardware and software issues and provided end-user technical support. | Ege University | OK |
| Installed and configured network devices (routers, switches, access points, firewalls) and built and maintained LAN infrastructure. | Ege University | OK |
| Installed and managed Windows Server 2012 R2 and 2016 environments, thin client and terminal systems. | Ege University | OK |
| Personal infrastructure (homelab) — 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. | ||
| 3-node RKE2 Kubernetes cluster on Proxmox VE 9, with kube-vip API VIP, Longhorn distributed storage and Traefik ingress. | homelab | UP |
| SNI-based routing with HAProxy; automatic certificates with cert-manager and Let's Encrypt DNS-01. | homelab | UP |
| Self-hosted mail server with Stalwart (SPF, DKIM, DMARC, reverse DNS) and webmail. | homelab | UP |
| Metrics with VictoriaMetrics, node-exporter and Grafana; monitoring and alerts with Uptime Kuma and ntfy; image update tracking with Diun. | homelab | UP |
| Local LLM server with llama.cpp and Open WebUI; Python automation that summarizes daily system reports. | homelab | UP |
| DNS-over-TLS with AdGuard Home and encrypted backups with restic. | homelab | UP |
Templates (skills)
| Template | Items |
|---|---|
| Template Linux | DebianRed Hat / RockyUbuntuopenSUSEArchsystemdSELinuxfirewalld |
| Template Containers | DockerKubernetesRKE2OpenShiftRancherTalosk3skubeadmHelmLonghorn |
| Template Virtualization | KVM/QEMUProxmox VEVMwareVirtualBox |
| Template Automation & CI/CD | BashPythonAnsibleJenkinsGitLabSonarQubeNexusDependency-Track |
| Template Monitoring & logging | ZabbixGrafanaGraylogRsyslogVictoriaMetricsLogstashKibanaOpenSearch DashboardsNagios XISentry |
| Template Identity & security | KeycloakHashiCorp VaultOpenLDAPWazuhOSSECNessus |
| Template Databases | PostgreSQLMySQLMongoDBPatronirepmgr |
| Template Search, cache & messaging | OpenSearchElasticsearchRedisValkeyRabbitMQKafka |
| Template Web & application servers | ApacheNginxPHP-FPMTomcatWildFly |
| Template Backup & storage | BaculaBarmanMinIO |
| Template Networking | TCP/IPDNSPowerDNSHAProxyKeepalivedEnvoyWireGuardOpenVPNLet's Encrypt |
Teaching
Özgür Yazılım A.Ş.
- Linux System Administration 101-102-103-104
- Kubernetes 101
- Jenkins Workshop
- Ansible Workshop
- Log Management and Analysis with Graylog
- GNU/Linux System Administration (Level 1)
- Server and Service Monitoring with Zabbix
- Kubernetes and Container Technologies
Events
| Time | Severity | Recovery time | Status | Host | Event |
|---|---|---|---|---|---|
| 2024-09 | Information | ONGOING | Ankara University | Management Information Systems (Distance Education) | |
| 2023 | Information | 2025 | RESOLVED | Mustafa Akgül Free Software Camps | Teaching |
| 2022-06 | Information | ONGOING | Özgür Yazılım A.Ş. | Linux System Administrator | |
| 2021-11 | Information | 2022-06 | RESOLVED | Ege University | Part-Time Technical Staff |
| 2020-09 | Information | 2022-06 | RESOLVED | Ege University | Computer Programming |
Web designs were made with the help of a local LLM.