Cloud Computing: GCP, AWS, Azure, IONOS, Aliyun, OTC, Hetzner
Linux/UNIX administration: RHEL/CentOS/Rocky Linux, Debian, Ubuntu, OpenSUSE, OpenBSD, FreeBSD
Orchestration: GKE, EKS, Vanilla Kubernetes, K3s, OpenShift, Rancher
Configuration management: Ansible, Chef, Puppet
CI/CD: Jenkins, Gitlab CI, Bitbucket CI, Github Actions
Observability: Prometheus, Grafana, Loki, Tempo, Thanos, Fluentd, FluentBit, Elasticsearch, Logstash, Kibana, Zabbix, Nagios
Service mesh: Linkerd, Istio, Cilium
Vulnerability assessment: OpenVAS, Trivy, Nessus
Policy management: Kyverno
Virtualization: KVM, ESXi
Containerization: Docker, containerd, LXC
Provisioning: Vagrant, Packer, Karpenter
Package Management: HELM, dep, rpm
DNS: BIND, CoreDNS, KubeDNS, Cloudflare API
Proxy: HAProxy, Squid, Envoy
Web: NGINX, Kong, OpenResty, Apache, lighttpd
Caching: Varnish, Redis, Memcached
Database: PostgreSQL, CNPG, MySQL, Clickhouse, SQLite, MongoDB, Tarantool
Messaging: Kafka, Zookeeper, VerneMQ
SMTP: Exim, Postfix, Mailu
Source version control: Git, GitHub, GitLab, gitolite, SVN
Scripting: Bash, Go, Perl
Infrastructure architecture