Helm: reusable chart – named templates, and a generic chart for multiple applications
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20 October 2020

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 »

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Kubernetes: AWS ALB Ingress Controller – add redirect to another domain
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9 October 2020

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 »

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Kubernetes: Evicted pods and Pods Quality of Service
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3 October 2020

We have a Kubernetes cluster running on AWS Elastic Kubernetes Service. In this cluster, we have an application which is usually working fine but sometimes our monitoring system notifies about unhealthy pods: Check pods: [simterm] $ kk -n eks-prod-1-web-projectname-admin-backend-ns get pod NAME READY STATUS RESTARTS AGE bttrm-web-projectname-admin-backend-64648597fc-9j29n 1/1 Running 0 43m bttrm-web-projectname-admin-backend-64648597fc-kptjj 1/1 Running 0… Read More »

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Redis: running Master-Slave replication in Kubernetes
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29 September 2020

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 »

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Slack: Cannot read property ‘appTeams’ of undefined
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23 September 2020

I have Slack desktop running on Arch Linux. It was installed from AUR and usually works fine. But today after rebooting my laptop Slack won’t start again sying it has the ‘appTeams’ property error: [simterm] $ slack Initializing local storage instance at path: /home/setevoy/.config/Slack/local-settings.json Failed to get path for key, this may be expected: /home/setevoy/.config/autostart… Read More »

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AWS Elastic Kubernetes Service: load-testing and high-load tuning – problems and solutions
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4 September 2020

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 »

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Kubernetes: a cluster’s monitoring with the Prometheus Operator
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13 August 2020

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 »

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Kubernetes: HorizontalPodAutoscaler – an overview with examples
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12 August 2020

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 »

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Kubernetes: PersistentVolume and PersistentVolumeClaim – an overview with examples
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5 August 2020

For the persistent data Kubernetes provides two main types of objects – the PersistentVolume and PersistentVolumeClaim. PersistentVolume – is a storage device and a filesystem volume on it, for example, it could be AWS EBS, which is attached to an AWS EC2, and from the cluster’s perspective of view, a PersistentVolume is a similar resource… Read More »

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