Improve DB health check, logging, and Docker security

BlazorBlog/Health/DatabaseHealthCheck.cs

@@ -20,11 +20,10 @@ public async Task<HealthCheckResult> CheckHealthAsync(
             try
             {
                 await using var db = await _contextFactory.CreateDbContextAsync(cancellationToken);
-                var canConnect = await db.Database.CanConnectAsync(cancellationToken);
+                await db.Database.OpenConnectionAsync(cancellationToken);
+                await db.Database.CloseConnectionAsync();
 
-                return canConnect
-                    ? HealthCheckResult.Healthy("Database connection is available.")
-                    : HealthCheckResult.Unhealthy("Database connection is not available.");
+                return HealthCheckResult.Healthy("Database connection is available.");
             }
             catch (Exception ex)
             {

BlazorBlog/Program.cs

@@ -151,6 +151,16 @@ static Task WriteHealthCheckResponseAsync(HttpContext context, HealthReport repo
                     report.Status,
                     report.TotalDuration.TotalMilliseconds);
 
+                foreach (var (name, entry) in report.Entries.Where(entry => entry.Value.Status != HealthStatus.Healthy))
+                {
+                    logger.LogWarning(
+                        entry.Exception,
+                        "Readiness check '{Name}' failed with status {Status}: {Description}",
+                        name,
+                        entry.Status,
+                        entry.Description);
+                }
+
                 context.Response.ContentType = "application/json";
 
                 var response = new

docker-compose.yml

@@ -7,7 +7,7 @@ services:
       - POSTGRES_USER=${POSTGRES_USER:-postgres}
       - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD in your environment or .env file}
     ports:
-      - "${POSTGRES_PORT:-15432}:5432"
+      - "127.0.0.1:${POSTGRES_PORT:-15432}:5432"
     volumes:
       - postgres-data:/var/lib/postgresql/data
     healthcheck: