I run Coder (a development environment platform) in my homelab Kubernetes cluster, with the PostgreSQL database hosted in Azure. The networking setup uses Tailscale to connect my homelab to Azure resources through a subnet router VM. Everything was working fine until I migrated to a new Azure subnet router—then Coder went down hard.
Coder was crash-looping with 693 restarts over 22 days. The logs showed:
2026-01-06 06:15:03.939 [warn] ping postgres: retrying
Before making changes:
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="//d3js.org/d3.v5.min.js"></script> | |
| <script src="https://unpkg.com/@hpcc-js/wasm@0.3.11/dist/index.min.js"></script> | |
| <script src="https://unpkg.com/d3-graphviz@3.0.5/build/d3-graphviz.js"></script> | |
| <div id="graph" style="text-align: center;"></div> | |
| <script> | |
| var dotIndex = 0; |
| <Project Sdk="Microsoft.NET.Sdk"> | |
| <PropertyGroup> | |
| <OutputType>Exe</OutputType> | |
| <TargetFramework>net6.0</TargetFramework> | |
| </PropertyGroup> | |
| <ItemGroup> | |
| <PackageReference Include="Microsoft.Diagnostics.NETCore.Client" Version="0.2.217401" /> | |
| <PackageReference Include="Microsoft.Diagnostics.Tracing.TraceEvent" Version="2.0.66" /> |
| using System; | |
| using System.Threading; | |
| namespace ConsoleApp | |
| { | |
| public class Program | |
| { | |
| const int interations = 100; | |
| const int spinWaitIterations = 1000000; | |
| private static Random random = new(); |
| // Licensed to the .NET Foundation under one or more agreements. | |
| // The .NET Foundation licenses this file to you under the MIT license. | |
| // See the LICENSE file in the project root for more information. | |
| using System; | |
| using System.Collections.Generic; | |
| namespace Microsoft.Diagnostics.Tools.Counters | |
| { | |
| public interface ICounterPayload |
| # This Deployment manifest defines: | |
| # - single-replica deployment of the container image, with label "app: dotnet-hello-world" | |
| # - Pod exposes port 8080 | |
| # - specify PORT environment variable to the container process | |
| # Syntax reference https://kubernetes.io/docs/concepts/configuration/overview/ | |
| apiVersion: apps/v1 | |
| kind: Deployment | |
| metadata: | |
| name: dotnet-hello-world | |
| spec: |
| kind: ConfigMap | |
| apiVersion: v1 | |
| data: | |
| schema-version: | |
| #string.used by agent to parse config. supported versions are {v1}. Configs with other schema versions will be rejected by the agent. | |
| v1 | |
| config-version: | |
| #string.used by customer to keep track of this config file's version in their source control/repository (max allowed 10 chars, other chars will be truncated) | |
| ver1 | |
| log-data-collection-settings: |- |
| <Project Sdk="Microsoft.NET.Sdk"> | |
| <PropertyGroup> | |
| <OutputType>Exe</OutputType> | |
| <TargetFramework>net5.0</TargetFramework> | |
| <Nullable>enable</Nullable> | |
| </PropertyGroup> | |
| <ItemGroup> | |
| <PackageReference Include="Microsoft.Extensions.Logging.EventSource" Version="5.0.0-preview.4.20251.6" /> |
| using Microsoft.Web.Administration; | |
| namespace MWASample | |
| { | |
| public class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| var serverManager = new ServerManager(); | |
| var config = serverManager.GetApplicationHostConfiguration(); |