DevOps

We see a top process that lives in memory. On a server with 100 containers. How to determine which container this process belongs to?

How to check the entry point of an existing container?

The internal Adeloader service checks passwords via LDAP. When a user tries to log in, the logs show an 'Authorization denied' error. What are your diagnostic actions?

What is the kernel.pid_max parameter and how can a low value affect it?

Tell about your experience with databases. Have you worked with Patroni? How to view the cluster composition?

Have you ever had to raise the network layer in Kubernetes?

Our pod in Kubernetes starts and immediately crashes. How can you diagnose the reasons using kubectl?

The developer asks which image is currently installed on the client. How to check using Docker?

Have you ever had to tweak Linux kernel parameters (sysctl)?

By which kernel technologies is container isolation ensured?

What services are available on Kubernetes worker and master nodes, and what are they responsible for?

How many nodes are needed for etcd fault tolerance and why?

Name 3-5 tools from the basic Linux distribution for diagnosing server performance issues.

The Docker container is launched via a Compose file, there is no Dockerfile itself. The container has /bin/bash, it starts and crashes due to a syntax error. How to debug the cause?

What is load average (LA)? What values are critical?

How does a container differ from a virtual machine? What are the advantages?

A 100GB block device mounted at /opt. df shows 100% used, du shows 95KB. Where does this discrepancy come from and how to find the cause?

Have you ever worked with packet analyzers?

Tell us about your experience and what you have worked with?

Have you ever had to limit the number of processes for a specific user in Linux?