career

What is DevOps?

I'm a DevOps engineer, and that is how others see my role in the team. But, often nobody in the organization doesn't really know what that means or how to proceed with DevOps. DevOps is often confused with a modern sysadmin, the person who "deploys" the software and helps developers to create environments. DevOps is a methodology on how modern software organizations should do software development. The DevOps team works on automating things by using different tools and ...

kubernetes, kube tips

Kubernetes Tips - Part 2

This post is about writing Kubernetes configuration files with syntax checking and how to run a private Docker images on Kubernetes. Check other Kubernetes tips articles on my blog by using this tag kube-tips. Writing Kubernetes Configuration Files Kubernetes configuration files are pretty complex to write and mostly you will just copy/paste some existing resource and try to manage it to work for a new one. This approach is fine unless you need to add some new configuration options ...

kubernetes, show me

Kubernetes Environment Variables

When building your application stack to work on Kubernetes, the basic pod configuration is usually done by setting different environment variables. Sometimes you want to configure just a few of them for a particular pod or to define a set of environment variables that can be shared by multiple pods. Later is usually done by creating a ConfigMap as a shared resource. Instead of specifying each environment variable individually we can reference the whole config map. Set Environment Variables To ...

kubernetes, show me

Stateful Applications on Kubernetes

Kubernetes and stateless applications work just out of the box. You can create a replicated application fast. The stateless application doesn't store any data, and simple load balancing does the job when it comes to scaling it. However, if you want to run any application that stores the data somewhere, you care about the order how the application starts or you want a stable hostname and network ID, then we are talking about the stateful applications and in Kubernetes world ...

kubernetes, kube tips

Kubernetes Tips - Part 1

Working with Kubernetes can be hard at the beginning. It is a complex orchestrator and you will probably spend a lot of time dealing with or finding a solution for a particular problem. I do the same, and I decided to write a series of posts which will cover different Kubernetes features. I will try to post at least two tips in each post. You will be able to find all tips using the tag kube-tips. Expose External Service Migrating ...

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Terraform and AWS Spot Instances

Terraform is my tool of choice for cloud provisioning. The difference compared to the similar tools for cloud provisioning is that Terraform saves the state. Terraform supports AWS and can provision spot instances also. Spot instances are great to save some money in the cloud. They could be used for any service, but it is really hard to manage stateful services like databases. If you have a stateless service spot instances are a great choice. You need to automate spot ...

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A Fresh Start

This is not the first time that I created a personal website, but it is the first time I know what to do with it. I mostly wrote how-to guides, but less about what is the DevOps and why we need it as a process in software development. On this blog, I will write about Infrastructure as a Code, modern DevOps tools, and container technologies, and some other interesting tech related stuff. Why DevOps? DevOps is a process of moving ...