Tag Archives: Troubleshooting

Mitigating slow container image pulls on Azure Kubernetes Service

It might happen that you experience slow container image pulls on your Azure Kubernetes Service nodes. First thought might be the Azure Container Registry is the root cause. Even when using the ACR without the geo-replication option enabled, image pulls from an ACR in Europe to AKS nodes running in Australia are fast. Therefore, it can be the ACR especially when you do not use the Premium SKU as the Read more [...]

Detecting SNAT port exhaustion on Azure Kubernetes Service

Running applications on an Azure Kubernetes Service cluster which make a lot of outbound calls might led to a SNAT port exhaustion. In today’s blog article I walk you through how to detect and mitigate a SNAT port exhaustion on AKS. What is a SNAT port exhaustion? It is important to know what a SNAT port exhaustion is to apply the correct mitigation. SNAT, Source Network Address Translation, Read more [...]

Troubleshooting Azure Kubernetes Service tunnel component issues

In Azure Kubernetes Service Microsoft manages the AKS control plane (Kubernetes API server, scheduler, etcd, etc.) for you. The AKS control plane interacts with the AKS nodes in your subscription via a secure connection that is established through the tunnelfront / aks-link component. -> https://docs.microsoft.com/en-us/azure/aks/concepts-clusters-workloads#kubernetes-cluster-architecture As Read more [...]

Check cluster manageability with Azure Kubernetes Service Diagnostics

It does not matter if your AKS cluster is running without any issues or you currently experiencing issues, you should run Azure Kubernetes Service Diagnostics on a regular base. But what is Azure Kubernetes Service Diagnostics? Let me give you a quick introduction. AKS Diagnostics is a functionality in the Azure portal which provides you with the capability to run a self-diagnosis against your Read more [...]

SSH access to AKS nodes for troubleshooting purposes

Under normal circumstances you do not need SSH access to your AKS nodes. Even when you create a new AKS cluster you do not have to provide an admin username and a public SSH key. Deployment method admin username required? public SSH key required? Azure portal No, cannot be set No, cannot be set Azure CLI Optional Optional ARM templates Required Required Terraform Required Required Why Read more [...]

Troubleshoot Azure VPN gateways with the Azure Network Watcher

Earlier this year Microsoft has launched a new Azure service for network diagnostics and troubleshooting called Network Watcher. -> https://azure.microsoft.com/en-us/services/network-watcher/ The Network Watcher offers a range of tools like VPN diagnostics and packet capturing to mention two of them. But I would like to talk about the VPN diagnostics capability in this blog post. Before Read more [...]

Windows Azure Pack Update Rollup 1 – MgmtSvc Operators

Vor gut einer Woche ist mir in einer Demo Installation des Windows Azure Packs und anschließender Aktualisierung mit dem Update Rollup 1 eine kleine Änderung aufgefallen. Heimlich und ohne darauf hinzuweisen entfernt Microsoft mit dem UR1 für das WAP die lokale Gruppe “MgmtSvc Operators” von dem Server auf dem die WAP Installation ruht. Bevor jetzt der große Aufschrei kommt, dass die Gruppe Read more [...]

System Center 2012 R2 VMM – KB-Artikel Archiv

Ich habe schon vor einiger Zeit damit angefangen eine gewisse Auswahl an Knowledge Base Artikeln zum Virtual Machine Manager zusammen zu tragen. Das Ergebnis ist jetzt als Seite auf meinem Blog unter dem Titel “SCVMM KB Archive” zu finden. Dieses Archiv enthält eine Auswahl von KB-Artikeln zum System Center 2012 SP1/R2 Virtual Machine Manager. Auch wenn die Artikel teilweise explizit die Versionen Read more [...]

Windows Azure Pack Troubleshooting Guide

Microsoft hat letzte Woche einen umfangreichen Guide zum Windows Azure Pack Troubleshooting veröffentlicht. Dieser umfasst dabei die folgenden Kategorien. Accounts, Subscriptions and Plans Automation and Tools Installation and Networking Security Service Provider Foundation Virtual Machine Clouds Web Site Clouds and other Providers -> http://technet.microsoft.com/en-us/library/dn554311.aspx Read more [...]

SC2012 R2 VMM Preview verwirft Windows Server 2012 R2 Preview NVGRE Gateway NAT Einstellungen

Heute hatte ich schon eine Anleitung für das Windows Server 2012 R2 Preview NVGRE Gateway mit NAT in SC2012 R2 VMM Preview veröffentlicht. -> https://www.danielstechblog.io/windows-server-2012-r2-preview-nvgre-gateway-mit-nat-in-sc2012-r2-vmm-preview/ Bei weiteren Tests ist mir heute aufgefallen, sobald der VMM Server und das NVGRE Gateway heruntergefahren worden sind, verwirft der VMM Server Read more [...]