Add healthcheck and probes

helmcharts/TestApp/charts/test-app/charts/test-app-api/templates/deployment.yaml

@@ -45,12 +45,23 @@ spec:
               protocol: TCP
           livenessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: http
+            initialDelaySeconds: 0
+            periodSeconds: 10
+            timeoutSeconds: 1
+            failureThreshold: 3
+          startupProbe:
+            httpGet:
+              path: /health/startup
+              port: http
+            failureThreshold: 30
+            periodSeconds: 10
           readinessProbe:
             httpGet:
-              path: /
+              path: /ready
               port: http
+            successThreshold: 3
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
       {{- with .Values.nodeSelector }}

helmcharts/TestApp/src/TestApp.Api/RandomHealthCheck.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+
+namespace TestApp.Api
+{
+    public class RandomHealthCheck : IHealthCheck
+    {
+        private static readonly Random _rnd = new Random();
+
+        public Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
+        {
+            var result = _rnd.Next(5) == 0
+                ? HealthCheckResult.Healthy()
+                : HealthCheckResult.Unhealthy("Failed random");
+
+            return Task.FromResult(result);
+        }
+    }
+}

helmcharts/TestApp/src/TestApp.Api/Startup.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Diagnostics.HealthChecks;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.HttpsPolicy;
 using Microsoft.AspNetCore.Mvc;
@@ -26,6 +27,8 @@ public Startup(IConfiguration configuration)
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddControllers();
+            services.AddHealthChecks()
+                .AddCheck<RandomHealthCheck>("Random check");
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
@@ -44,7 +47,9 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 
             app.UseEndpoints(endpoints =>
             {
-                endpoints.MapGet("/", _ => Task.CompletedTask);
+                endpoints.MapHealthChecks("/health/startup");
+                endpoints.MapHealthChecks("/healthz", new HealthCheckOptions { Predicate = _ => false });
+                endpoints.MapHealthChecks("/ready", new HealthCheckOptions { Predicate = _ => false });
                 endpoints.MapControllers();
             });
         }