Finally got time to migrate the RTFM.CO.UA blog to a new server with Debian 10. This time manually, without any automation will set up a LEMP stack Wrote a similar at 2016 – Debian: установка LEMP — NGINX + PHP-FPM + MariaDB (Rus), but in time the post is more complete of the process and… Read More »
The task is to create a Jenkins job to deploy Redis to Dev/Stage/Prod Kubernetes clusters. In the Redis: running Master-Slave replication in Kubernetes we did it manually to see how it’s working, now it’s time to automate it. The main question is how to pass parameters for different environments during the deployment? I’d like to… Read More »
We have a project running in Kubernetes that needs to run SQL migrations during deployment. To run migrations need to clone a Github repository and run actually migrations stored in it. Currently, this is done with Kubernetes initContainers , and there are two of them – the first one with git clones the repository with… Read More »
We have a Docker image with Git client installed. The task is to automatically clone a repository when running a container from this image. git clone – fatal: unable to fork When running the git clone command in a container from this Docker image it fails with the “unable to fork” error: [simterm] / #… Read More »
Our project is growing, and more and more applications are started on the AWS Elastic Kubernetes Service. Finally, we’ve faced with the question already mentioned in the Helm: пошаговое создание чарта и деплоймента из Jenkins (Rus) – what to do with Kubernetes manifests and Helm templates when using a lot of similar applications? Especially now,… Read More »
We have an application – an old version, and a new one, and two domains for them. The application is working on AWS Elastic Kubernetes Service, behind an AWS LoadBalancer created with AWS ALB Ingress Controller. The task is to create a redirect from the old domain’s Ingress to a new LoadBalancer: old URL: dev.api.old-example.com… Read More »
The task is to spin up a Redis instance in a Kubernetes cluster. Will use the Master-Slave replication setup with Sentinels for monitoring and failover operations. Check the Redis: replication, part 2 – Master-Slave replication, and Redis Sentinel post for more details. Redis cluster vs Redis replication See Redis: replication, part 1 – an overview.… Read More »
Actually, this post was planned as a short note about using NodeAffinity for Kubernetes Pod: But then, as often happens, after starting writing about one thing, I faced another, and then another one, and as a result – I made this long-read post about Kubernetes load-testing. So, I’ve started about NodeAffinity, but then wondered how… Read More »
Continuing with the Kubernetes: monitoring with Prometheus – exporters, a Service Discovery, and its roles, where we configured Prometheus manually to see how it’s working – now, let’s try to use Prometheus Operator installed via Helm chart. So, the task is spin up a Prometheus server and all necessary exporter in an AWS Elastic Kubernetes… Read More »
Kubernetes HorizontalPodAutoscaler automatically scales Kubernetes Pods under ReplicationController, Deployment, or ReplicaSet controllers basing on its CPU, memory, or other metrics. It was shortly discussed in the Kubernetes: running metrics-server in AWS EKS for a Kubernetes Pod AutoScaler post, now let’s go deeper to check all options available for scaling. For HPA you can use three… Read More »