Purpose of the article: to increase fault tolerance, security level and simplify the process of updating systems using a micro service architecture using virtualization tools. Method: Using microkernel virtualization tools called Unikernel images. Unikernel are virtual machine images containing a single application. Each micro service of the system runs in the Unikernel image, the processes and services used are not contained in the image. The result: a definition of Unikernel is given; a comparison is made with existing virtualization systems. The mechanisms that implement the Unikernel technology are listed. The definitions of the library operating system and microkernel are given. The definition of Unikernel is given as a technology that combines library operating systems and microkernels. The main advantages of using Unikernel are listed: ensuring the security of information systems and ease of updates. A developed software tool for testing Unikernel images for the possibility of penetrating an information system in the event of a vulnerability of the “remote execution of arbitrary code” type in the software tool. The image was tested. In conclusion, the assessment of the effectiveness of the use of Unikernel technology for building systems with a micro service architecture, in particular for building SIEM systems.