Questions tagged [kubernetes]

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Initializing Cassandra schema

Recently I have started working on a project in which we are using Cassandra. It's a quite a new project, so we haven't decided how to initialize the schema. We are using Docker and Kubernetes. I've ...
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1answer
42 views

Show a service's status to the user

Some design thoughts on an application that is mostly event driven using kubernetes and docker. The application is a web based application, a single page one. It shows updates from the back-end such ...
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21 views

How to version k8s yaml files and keep them in sync with the cluster in the cloud?

Intro When a developer deploy his code, the ci will execute kubectl set image deployment/gcloud-example gcloud-example=stavalfi/gcloud-example:<new-tag>. But the ci won't change the tag in the ...
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1answer
96 views

Kubernetes Cron Job is expensive?

I have to implement a feature in an existing application, which requires calling an API every minute. My app's microservices runs in Kubernetes environment. To achieve this, my first thought is ...
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8 views

Scale spring-batch instances executed from within a web container

I am re-designing our current ETL for file ingestion where spring-batch containers will be deployed on Kubernetes. Each file type is processed by a different job, which will be triggered on demand via ...
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1answer
23 views

What are the benefits of running Apache Spark on Kubernetes?

When running Apache Spark one submits jobs to a Cluster Manager. The cluster manager is delegated with the task of accepting / declining requests for resources. The cluster manager could either be ...
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13 views

How to manage kubernetes configmap values in version control across environments?

I am looking for a way to automate deployment of configmaps to our dev/qa/prod environments. Right now our applications rely on kubernetes configmap/secrets that we manually apply in the cluster using ...
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26 views

Sending and receiving data from a Kubernetes Job

I'm working on this containerized API where in two steps (one asynchronous and one synchronous) the user can interact with the output generated by the first step trough a front-end service. I wasn't ...
0
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1answer
94 views

What's a good liveness probe for a Hangfire background job server?

We're in the process of moving everything to K8s and one of our applications is a small .NET Core 2.2 console app that runs a Hangfire background job server. At the moment the app runs as a Windows ...
1
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1answer
571 views

Microservices and 3rd party APIs

I recently joined a team who is trying to use "microservice" pattern for their new application. They've already started to implement API's. In the end it should be an API for both mobile and web UI. I ...
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1answer
78 views

How microservices db are updated and sync when scale? [closed]

Scenario: In Case I have MS "MS-1" Orchestration detect high volume Orchestration create additional node with cloned MS "MS-2" "MS-2" get request and update its DB Question : How MS "MS-1" will ...
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1answer
48 views

Containers Across Operating systems

Curious how containers are portable across development/testing/cloud environments with no worry needed about the underlying infrastructure. Does the Docker Engine essentially standardize operating ...
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12 views

Applying velero labels using kubernetes operator based on operator-sdk

I am using velero to take backups of my Kubernetes STS/PVCs/PVs, I have an operator (based on operator-sdk written in go) for my cluster, that I am using to apply labels to my CRD. Something that I ...
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71 views

How do I cheaply run different-sized same-algorithm workloads in EKS?

Problem Statement I am trying to build a game engine where: The game state exists in Postgres (probably AWS RDS for PostressSQL) The simulation / game state is updated asynchronously by back-end ...
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46 views

Can/should multiple application contexts share a common microservice in a single namespace?

My current employer has a single namespace into which all microservices for all projects are deployed. Projects A, B and C all use microservice x in this common namespace: Rather than each design ...
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61 views

Run a job every hour with Lambda or something else?

I am working on a SaaS project that will have a trial when the trial is ending I get a webhook notification when 3 days are remaining. I do some stuff with this and one of the things is I update user....
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89 views

How can I economically scale to 100+ instances of my .Net Core app without using 1 container per instance?

Currently I have a .NET core application, which fires up a new thread to hold each customer account. Each thread instance: Is long running for many months or more Holds open SignalR Websockets and ...
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1answer
41 views

What happens to network connections to the web app running in a pod, when a pod is down in a Kubernetes node?

Each pod represents single instance of the web application in a node of Kubernetes. Lets say 100 users are signed into a web app like Stackoverflow and connected to Pod1 of NodeA. Pod1 is down now. ...
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1answer
103 views

How was industry dealing with containerizations and container orchestration before Docker and Kubernetes? [closed]

Before Kafka, we had RabbitMQ, ActiveMQ etc. Mostly there use to be a something before version, in technology. But What was industry using something similar to Docker and Kubernetes, before they ...
1
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1answer
90 views

About databases in docker containers

I'm trying to understand containerized apps and databases and I'm trying to understand the microservice architecture using kubernetes. One thing that I couldn't get my mind convinced is the database ...
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96 views

What are best practices for deploying different configurations per environment in Kubernetes/OpenShift?

Kubernetes provides a very elegant mechanism for managing configuration for pods using ConfigMaps. What's not clear from the documentation is what the recommended practice is for using ConfigMaps to ...