Tag: Troubleshooting
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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…
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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…
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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 you can run the AKS control plane within a…
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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…
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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…
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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…