improved kubernetes example

kubernetes/README.md

@@ -1,4 +1,4 @@
-# WireGuard cluster example
+# Kubernetes cluster example
 
 This example will create 5 kubernetes nodes using k3s: a master and 4 workers.
 All VMs have public IPs, which can be used to publish ports.
@@ -8,7 +8,44 @@ To create the VMs, run:
 ./create_vms.sh
 ```
 
-And to deploy:
+And to deploy Kubernetes:
 ```
 ./deploy.sh
 ```
+
+After this, you can deploy an nginx service to all nodes:
+```
+./nginx_service.sh
+```
+
+## Succesful output
+
+Assuming everything went fine, at the end you should see something like this:
+```
+daemonset.apps/nginx-daemonset unchanged
+service/nginx-service unchanged
+
+NGINX DEPLOYED! PLEASE FIND DETAILS OF PODS AND SERVICES BELOW:
+
+NAME                        READY   STATUS    RESTARTS   AGE   IP          NODE         NOMINATED NODE   READINESS GATES
+pod/nginx-daemonset-dr84t   1/1     Running   0          3s    10.42.1.4   k3s-node-4   <none>           <none>
+pod/nginx-daemonset-lj4tp   1/1     Running   0          3s    10.42.3.5   k3s-node-2   <none>           <none>
+pod/nginx-daemonset-r4q5n   1/1     Running   0          3s    10.42.4.4   k3s-node-1   <none>           <none>
+pod/nginx-daemonset-t56dd   1/1     Running   0          3s    10.42.0.9   k3s-master   <none>           <none>
+pod/nginx-daemonset-z5tmn   0/1     Pending   0          3s    <none>      k3s-node-3   <none>           <none>
+
+NAME                    TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE   SELECTOR
+service/kubernetes      ClusterIP   10.43.0.1       <none>        443/TCP        2m    <none>
+service/nginx-service   NodePort    10.43.108.125   <none>        80:30080/TCP   3s    app=nginx
+
+TO CHECK IF NGINX IS WORKING, USE THE FOLLOWING COMMANDS:
+   curl http://149.36.48.101:30080
+   curl http://149.36.48.104:30080
+   curl http://149.36.48.105:30080
+   curl http://149.36.48.102:30080
+   curl http://149.36.48.103:30080
+```
+
+## Tutorial
+
+A more elaborate tutorial can be found [in the docs](http://docs.detee.ltd/tutorials/kubernetes).

kubernetes/create_vms.sh

@@ -2,32 +2,32 @@
 set -e
 mkdir -p tmp
 
-detee-cli vm deploy --hostname k3s-master --vcpus 4 \
-  --memory 4000 --disk 20 --location Random --public-ip |
+detee-cli vm deploy --hostname k3s-master --vcpus 2 \
+  --memory 3000 --disk 20 --location Random --public-ip |
   tail -1 > tmp/master_ssh_command &&
   echo "k3s-master successfully created" &
 sleep 1
 
-detee-cli vm deploy --hostname k3s-node-1 --vcpus 4 \
-  --memory 4000 --disk 20 --location Random --public-ip |
+detee-cli vm deploy --hostname k3s-node-1 --vcpus 2 \
+  --memory 3000 --disk 20 --location Random --public-ip |
   tail -1 > tmp/node1_ssh_command &&
   echo "k3s-node-1 successfully created" &
 sleep 1
 
-detee-cli vm deploy --hostname k3s-node-2 --vcpus 4 \
-  --memory 4000 --disk 20 --location Random --public-ip |
+detee-cli vm deploy --hostname k3s-node-2 --vcpus 2 \
+  --memory 3000 --disk 20 --location Random --public-ip |
   tail -1 > tmp/node2_ssh_command &&
   echo "k3s-node-2 successfully created" &
 sleep 1
 
-detee-cli vm deploy --hostname k3s-node-3 --vcpus 4 \
-  --memory 4000 --disk 20 --location Random --public-ip |
+detee-cli vm deploy --hostname k3s-node-3 --vcpus 2 \
+  --memory 3000 --disk 20 --location Random --public-ip |
   tail -1 > tmp/node3_ssh_command &&
   echo "k3s-node-3 successfully created" &
 sleep 1
 
-detee-cli vm deploy --hostname k3s-node-4 --vcpus 4 \
-  --memory 4000 --disk 20 --location Random --public-ip |
+detee-cli vm deploy --hostname k3s-node-4 --vcpus 2 \
+  --memory 3000 --disk 20 --location Random --public-ip |
   tail -1 > tmp/node4_ssh_command &&
   echo "k3s-node-4 successfully created" &
 

kubernetes/k8s_nginx.yml

@@ -0,0 +1,33 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: nginx-daemonset
+  labels:
+    app: nginx
+spec:
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+        - name: nginx
+          image: nginx:latest
+          ports:
+            - containerPort: 80
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+spec:
+  type: NodePort
+  selector:
+    app: nginx
+  ports:
+    - port: 80
+      targetPort: 80
+      nodePort: 30080

kubernetes/nginx_service.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+ssh_master=$(cat tmp/master_ssh_command)
+
+set -e
+
+cat k8s_nginx.yml | $ssh_master kubectl apply -f -
+
+echo
+echo NGINX DEPLOYED! PLEASE FIND DETAILS OF PODS AND SERVICES BELOW:
+echo
+
+$ssh_master kubectl get pods,svc -o wide
+
+echo
+echo TO CHECK IF NGINX IS WORKING, USE THE FOLLOWING COMMANDS:
+grep -r ssh tmp/ | cut -d '@' -f2 |
+  xargs -i echo "   curl http://{}:30080"
+echo
+