RTFM: Linux, DevOps, and system administration

GitLab: Helm chart of values, dependencies, and deployment in Kubernetes with AWS S3
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4 February 2023

We continue our engagement with GitLab and its deployment in Kubernetes. The first part – GitLab: Components, Architecture, Infrastructure, and Launching from the Helm Chart in Minikube, and now let’s get ready to deploy to AWS Elastic Kubernetes Service. What will we do and where: deploy to AWS from the Helm-chart, with some test env Kubernetes –… Read More »

GitLab: Components, Architecture, Infrastructure, and Launching from the Helm Chart in Minikube
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2 February 2023

As GitLab recently changed the policy of providing free access, and now only 5 users will be available for the Free subscription, we decided to move to the self-hosted version. In general, they have interesting terms with the license: the price depends on the number of users, you can buy it for at least one… Read More »

Kubernetes: Cluster Cost Monitoring – Kubernetes Resource Report and Kubecost
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29 January 2023

The very useful thing is to monitor how efficiently the cluster is being used, especially if applications are deployed by developers who do not delve into requests much and set inflated values ”in reserve”. A reserve, of course, is needed – but simply requesting resources is a bad idea. For example, you have a WorkerNode… Read More »

Kustomize: managing Kubernetes manifests – an overview, and examples
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15 January 2023

Kustomize is a configuration management tool for Kubernetes that allows you to use common sets of manifests that can be changed for each specific environment/cluster, and can be an alternative to (or complement) Helm templates. The general concept of Kustomize is “where, what, and how”: “where” is a base manifest, for example deployment.yaml “what” –… Read More »

BASH: using functions, with examples
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15 January 2023

This a translation of a post from 2013 with some edits, but still relevant for learning BASH. In fact, a function in bash is a regular variable, but with more features. The main use is when the same code needs to be used several times and/or in different related scripts. Declaring and calling a function The… Read More »

BASH: using loops – for, while, until, with examples
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15 January 2023

This a translation of a post from 2013 with some edits, but still relevant for learning BASH. Brief description of the difference in the Bash loop types: for– will perform an action as long as there are objects to perform (for example, reading a stream from a stdin, file, or function); while– will perform an… Read More »

Grafana Loki: alerts from Ruler and labels from logs
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7 January 2023

For general information about Grafana Loki, see the Grafana Loki: architecture and running in Kubernetes with AWS S3 storage and boltdb-shipper post. Among other components of the Loki, there is a separate service called ruler that is responsible for working with alerts that can be generated directly from logs. The idea is very simple: create… Read More »

Grafana Loki: architecture and running in Kubernetes with AWS S3 storage and boltdb-shipper
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7 January 2023

The last time I worked with Loki when it was still in Beta, and it looked much simpler then than it does now. In the new project, there is no logging system at all, and since we all love the Grafana stack, we also decided to use Loki for logging. Although to be honest, I… Read More »

Prometheus: Kubernetes endpoints monitoring with blackbox-exporter
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11 December 2022

The blackbox-exporter is an exporter that can monitor various endpoints – URLs on the Internet, your LoadBalancers in AWS, or Services in a Kubernetes cluster, such as MySQL or PostgreSQL databases. Blackbox Exporter can give you HTTP response time statistics, response codes, information on SSL certificates, etc. What are we going to do in this… Read More »

Terraform: modules, Outputs, and Variables
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11 December 2022

Eventually, I got to the modules in Terraform. Namely, I had to figure out how to transfer the values of the variables between two modules. So in this post, the most basic and simple examples of working with modules and their values && outputs. See more in the documentation – Modules. The Root module First, let’s… Read More »

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