The paper is a study of using cloud technologies to teach the Linux operating system to future computer science teachers. The authors integrated the NDG Linux Essentials MOOC course, Apache Cloudstack and Proxmox VE private cloud platforms into the CL-OS Cloud Lab. A model of such a lab was developed. The paper describes the author's teaching materials such as tests, essays and assignments. They complement the resources of the cloud lab. The specifics of students' activities in the conditions of the real educational process according to the methodology of blended learning were analyzed. To confirm the effectiveness of the Cloud Laboratory methodology, a pedagogical experiment was conducted in the study. Its results were tested using statistical methods such as ANOVA for repeated measures and Spearman's rank correlation coefficient. These methods made it possible to investigate some of the factors that influence the educational performance of future computer science teachers in learning Linux.