Developer Tools

Problem: The client experienced issues with Docker Swarm configuration in production. Specifically, when a container restarted, the application failed to recover properly. The client requested a review of the configuration to identify the root cause and potential improvements to enhance the cluster’s functionality. Process: Step 1: Initial Investigation The client provided details of the Docker […]

Problem: The client experienced a problem where one of the images in their Nexus Repository was deleted unexpectedly without any trace. The client needed assistance in answering the following questions: How was the image deleted and is it possible to recover it? How can future abrupt deletions of images be prevented? How can Nexus logging […]

Problem: The client’s production environment includes Rancher installed on two clusters: a Rancher cluster and an application cluster. During the cluster setup, the kubelet certificate was generated with a validity of one year, which recently expired. According to the Rancher RKE documentation, additional configuration is needed to manage certificate validity. The client observed inconsistencies: Some […]

Problem: The client faced issues with frequent re-elections in a Docker Swarm cluster whenever there were brief server-level disruptions. They sought guidance on modifying the swarm election timeout to stabilize the cluster and prevent unnecessary re-elections. Additionally, they wanted to understand the relationship between election timeout, heartbeat, and dispatcher-heartbeat settings. Process: Step 1: Initial Investigation […]

Problem: The client reported two main issues: One of the Kubernetes master nodes was in a “not ready” state. They needed to upgrade their Kubernetes version from 1.26 to 1.29. The client requested support to address these concerns. The client had already shut down the master node and was awaiting further instructions for troubleshooting. Process: […]

Problem: The customer is facing frequent Docker Swarm re-elections, triggered even by brief server issues lasting just a few seconds. They are seeking guidance on how to modify the Swarm election timeout and whether adjusting this value will have any impact on the system. Process: Step 1: Initial Investigation The customer reported frequent leader re-elections […]

Problem: The client reported an issue with the hard limit of 1MB for ConfigMap storage in Helm, which was causing problems with their deployment process. This limitation hindered their ability to store large configurations, necessitating a solution that could accommodate their growing data needs. Solution: To address the issue, the expert initiated an in-depth investigation. […]

Problem: The client is using kube-prometheus-stack version 44.2.1 as their monitoring solution, and Twistlock scans have identified vulnerabilities in various packages including github.com/docker/distribution (CVE-2023-2253), golang.org/x/net (CVE-2022-41723), github.com/emicklei/go-restful/v3, and Go language with CVEs such as CVE-2021-29923, CVE-2021-38297, CVE-2021-39293, CVE-2021-41771, CVE-2021-41772, CVE-2021-44716, CVE-2022-23772, CVE-2022-23773, CVE-2022-23806, CVE-2022-24675, CVE-2022-24921, CVE-2022-27664, CVE-2022-28131, CVE-2022-28327, CVE-2022-2879, CVE-2022-2880, CVE-2022-30580, CVE-2022-30630, CVE-2022-30631, CVE-2022-30632, CVE-2022-30633, […]

Problem: The client requested a solution to automate the update process for the Helm/Kubernetes compatibility matrix. It’s crucial to address this issue because relying on manual updates causes delays in the adoption of Helm and results in the use of outdated Helm versions. The lack of automation results in incomplete release notes and repeated postponements, […]