The Certified Kubernetes Security Specialist (CKS) exam is the most challenging in the lineup of practical Kubernetes exams from CNCF.  I won't delve deep into its specifics here, as the Internet is full of relevant information.  It's worth saying that only those candidates who have passed the Certified Kubernetes Administrator (CKA) exam successfully  are eligible for the CKS exam. The topics required for the exam can be found . Additionally, proficiency with tools like falco, sysdig, and trivy is essential. You need to keep in mind that the Kubernetes cluster version used in the exam is updated following the release of each new Kubernetes version, and the delay between the release of a new Kubernetes version and the exam's version update usually does not exceed two months. here Preparation: Initial Steps and Unexpected Hurdles My preparation began two years ago with a course on . However, after two months, I had to interrupt my studies due to family circumstances. When I returned to my preparation some time later, I was faced with the necessity to move to another country. Due to it I had very little time for my studies, and I decided to take the exam without proper preparation. As expected, my first attempt was unsuccessful. kodekloud.com Next, I turned to the course offered by , but I found its content too sparse for independent preparation. Following the community's advice, I purchased a course from , which eventually proved to be the most beneficial, especially in the practical aspect. linuxfoundation.org killer.sh Nevertheless, a number of questions in the simulator were limited, and most of them did not provide a full picture of the possible exam tasks. This prompted me to create my own exam emulator based on AWS EC2 spot instances, using Terraform and Terragrunt. killer.sh CKS Simulator: Birth and Growth While developing the simulator, I managed to prepare for the exam and passed it. It happened on the second attempt due to technical problems from the examination center. After having passed it, I decided to share my experience and tools. It  led to the creation of the CKS Simulator project. Since then, 9 other professionals have joined the project. At present some of them are helping to update the database with exam questions, while others are assisting with documentation and the release of new versions. We are actively gathering feedback from those who've taken the exam to improve our simulator continuously. Mastering the CKS Exam: Insights and Tips For the examination, candidates connect through a secure browser to a virtual machine's desktop (similar to VNC). You won't have access to your browser bookmarks. Within this virtual machine you can launch as many terminals as you like and access the allowed documentation. However, remember that you can only have one page open at a time. It’s common to have problems with exam infrastructure. They include slow terminal responses or connection issues. If you encounter any such difficulties, immediately contact the support, and they'll reschedule your attempt. Having connected to this virtual machine, you'll find connections pre-configured for approximately 16 Kubernetes clusters. As a rule, each exam question utilizes its cluster. Questions vary in their point values, usually ranging from 1 to 12 points. Time management is crucial in this exam. As experience shows each point corresponds to roughly 1.1 minute. So, if a question is worth 4 points, try not to spend more than 5 minutes on it. If it takes longer, mark the question and move on to others, returning to it after you've seen all the remaining questions. Aim to use imperative commands as much as possible, such as for creating pods, deployments, secrets. Save manifests from these commands, edit the obtained manifests, and apply them to the cluster. The virtual machine's terminal has the alias set up. Make use of it, and also use the auto-completion feature (Tab key). Prioritize using the 'help' feature of console utilities whenever possible, as searching through the browser can be time-consuming. k=kubectl How the Simulator Works: The simulator sets up a VPC (Virtual Private Cloud), subnets, 10 Kubernetes (k8s) clusters with prepared resources, and a work-PC with tests for validation. To create exam infrastructure we use Terraform modules as templates. Terragrunt manifests consist of some modules and their parameters. Terragrunt executes these manifests and creates all the necessary exam infrastructure. The module handles network creation. vpc The module manages the creation of SSH keys. ssh-keys sets up a k8s cluster with specific parameters, such as the k8s version, EC2 node type, the number of worker nodes, their labels within the k8s cluster, and runtime ( , , ). k8s_self_management containerd cri-o containerd_gvisor The module is responsible for creating the work-PC. work_pc For convenience, all launch scripts have been added to a Makefile. To set up a new mock exam, you just need to execute the command , and to remove it . TASK=01 make run_cks_mock TASK=01 make delete_cks_mock Once the exam is set up, the script's output will provide you with the IP address of the work-PC. You log into it and complete the assignments. To check the remaining time for the exam, use the command, and to evaluate the assignments, use . time_left check_result For a detailed guide you can refer to the or watch the . documentation video tutorial Resources and Future Plans Currently, we have ready-made Terraform modules for scenario creation, lab works, and simulators for CKS and CKA exams, as well as video materials. We are planning to develop the simulator for the CKAD exam and lab works for AWS EKS in a very short time. : The Most Effective Path to Passing the CKS Exam Purchase the exam during discount periods. For example, during Cyber Monday, discounts can exceed 50%. I recommend buying and going through Kim Wüstkamp's course. Dive into all the theoretical materials and complete the practical assignments provided in the course. Upon purchasing the course, you'll gain access to a Slack channel. Here, you can pose questions to the course author and interact with other participants who are also preparing for the exam or have recently passed it. It's an excellent opportunity to learn about new exam questions and add them to your simulator. Regularly take the mock exam on our simulator until your final score consistently reaches 90% or above. Complete the mock exam on the platform. Its user interface closely mirrors the real exam, which will help you get accustomed to the format and prepare better . killer.sh After going through all these preparatory steps, you'll be ready to tackle the actual CKS exam. Conclusion If our project draws your interest, join us on or our . We always welcome new members and their feedback. We hope our platform will assist many engineers in passing the CKS and other IT-related exams successfully. GitHub YouTube channel If you have any changes or additions to share, please let me know!

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