Horizontal scaling of Web applications

V diplomski nalogi je predstavljeno okolje za avtomatsko horizontalno skaliranje, ki se glede na metrike, ki jih okolje izvaža v podatkovno bazo, odzove z ustvarjanjem ali brisanjem kontejnerjev ali navideznih računalnikov. Okolje poleg skaliranja tudi izriše grafe o porabi posameznih virov v našem sistemu (poraba pomnilnika, poraba procesorja, število poslanih paketov preko omrežja ...), na katerih lahko spremljamo delovanje sistema. Ustvarjeno okolje temelji na odprtokodnih orodjih OpenStack, Docker, Grafana, Prometheus, Alertmanager, cAdvisor, Node exporter, Vagrant in Ansible.This thesis is devoted to design environment for automatic horizontal scaling, which will, based on the metrics, that are provided by our environment and saved into database, respond with creation or removal of virtual machines. Environment also has graphs representing resource usages (memory usage, processor usage, numbers of network packets sent, ...), on which we can monitor our system. Environment is built with the help of open source tools OpenStack, Docker, Grafana, Prometheus, Alertmanager, cAdvisor, Node exporter, Vagrant and Ansible