- Betriebssysteme
- Diverse Linux-Distributionen: Debian, Red Hat, SLES
- SINIX, ReliantUnix, Solaris
- Automatisierung
- Linux Lifecycle Management mit Ansible
- Hardening
- SELinux
- Virtualisierungen
- Proxmox
- Proxmox Backup Server
- Proxmox Datacenter Manager
- ProxLB
- Nutanix AHV
- Red Hat Virtualization
- VMware
- Proxmox
- Storage, File-Server
- Ceph, CIFS, DRBD, FibreChannel, iSCSI, NFS, ZFS
- NetApp
- Samba
- Networking, Firewalling, Security-Scanner
- Bind/Named
- BIRD (Routing)
- Firewall-Daemon
- Infoblox
- iptables / nftables
- Tenable (Nessus)
- Netzwerk-Protokolle
- IPv4 bis auf Bitebene
- BGP, EIGRP, HSRP, QoS, (R)STP, VLAN, VRF, VSS
- VPN
- IPsec/StrongSwan
- OpenVPN
- Wireguard
- Identity Management
- (Free)IPA
- Monitoring
- CheckMK
- Container
- Docker, Podman
- Kubernetes (Grundkenntnisse)
- Datensicherung
- REAR
- Rubrik
- High Availability
- Pacemaker
- Keepalived
- Web-Server, (Reverse-)Proxy, Load-Balancer
- Apache HTTPD
- HAproxy
- Nginx
- Squid
- E-Mail
- Amavis
- Dovecot
- Postfix
- SpamAssassin
- Datenbanken
- Informix
- MySQL/MariaDB
- Oracle
- PostgreSQL
- Message Broker
- RabbitMQ
- Versionierung
- Git / GitLab
- Dokumentation, Planung
- Wiki
- Wekan
- Telefonie
- Asterisk
- Programmiersprachen
- C (System- und Netzprogrammierung)
- Skriptsprachen
- Ansible (Ansible Tower, AAP, AWX)
- Bash
- Perl