AKS Page not Found for SwaggerUI - asp.net-core

Question

I have a .net core 6 web api service which I have deployed on AKS(Azure Kubernetes Services). The Program.cs looks like so;
var builder = WebApplication.CreateBuilder(args);
var swaggerConfig = builder.Configuration.GetSection(nameof(SwaggerConfig)).Get<SwaggerConfig>();
builder.Services.AddSwaggerGen(opts =>
{
opts.SchemaFilter<ExampleNashSchemaFilter>();
opts.SwaggerDoc(swaggerConfig.ApiVersion, new Microsoft.OpenApi.Models.OpenApiInfo { Title = swaggerConfig.ApiName, Version = swaggerConfig.ApiVersion });
});
builder.Services.Configure<ForwardedHeadersOptions>(options =>
{
options.ForwardedHeaders = ForwardedHeaders.XForwardedFor |
ForwardedHeaders.XForwardedProto;
// Only loopback proxies are allowed by default.
// Clear that restriction because forwarders are enabled by explicit
// configuration.
options.KnownNetworks.Clear();
options.KnownProxies.Clear();
});
builder.Services.AddCors(p => p.AddPolicy("devcors", builder =>
{
builder.WithOrigins("*").AllowAnyMethod().AllowAnyHeader();
}));
var app = builder.Build();
app.UseCors("devcors");
app.UseSwagger();
app.UseSwaggerUI(c =>
{
c.SwaggerEndpoint($"/swagger/v1/swagger.json", swaggerConfig.ApiName);
c.RoutePrefix = "swagger";
});
app.UseAuthorization();
app.MapControllers();
app.UseDefaultFiles();
app.UseStaticFiles();
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
app.Run();
Here is the swagger settings on appsettings.json
"SwaggerConfig": {
"ApiName": "Some Services",
"ApiVersion": "v1"
}
Here is my deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: servicetest
spec:
replicas: 1
selector:
matchLabels:
app: servicetest
template:
metadata:
labels:
app: servicetest
spec:
containers:
- name: servicetest
image: myprivatehub/servicetest:latest
imagePullPolicy: Always
ports:
- containerPort: 80
imagePullSecrets:
- name: regcred
---
apiVersion: v1
kind: Service
metadata:
name: servicetest
spec:
selector:
app: servicetest
ports:
- port: 80
protocol: TCP
targetPort: 80
type: LoadBalancer
For some weird reasons I can access the APIs running from my service on AKS but I can't access the swagger/index.html I get an error page can't be found. I replicated this deployment on my minikube and it works well. I'm curious to know why i can't access swaggerUI from AKS

Answer 1

Seems that you do not have an Ingress Controller deployed on your AKS. You will need that in order to get ingress to work and to expose the swagger-ui.
To access the swagger-ui for testing purposes you can do this:
kubectl port-forward service/servicetest 80:8080
Afterwards just access http://localhost:8080
But you should def. install an ingress-controller: Here is a Workflow from MS to install ingress-nginx as Ingress Controller on your Cluster.
To avoid that every service spawns a LoadBalancer and a PublicIP in Azure (to keep an eye on your costs), you will then only expose the ingress-controller to the internet and could also specify the loadBalancerIP statically if you created the PublicIP in advance:
apiVersion: v1
kind: Service
metadata:
annotations:
service.beta.kubernetes.io/azure-load-balancer-resource-group: myResourceGroup # only needed if the LB is in another RG
name: ingress-nginx-controller
spec:
loadBalancerIP: <YOUR_STATIC_IP>
type: LoadBalancer
The Ingress Controller then will route incoming traffic to your application with an Ingress resource:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: minimal-ingress
spec:
ingressClassName: nginx # ingress-nginx specifix
rules:
- http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: servicetest
port:
number: 80