init commit

provision/example-app.sh

@@ -0,0 +1,100 @@
+#!/bin/bash
+set -euo pipefail
+
+#
+# Helper functions
+#
+declare -i term_width=80
+
+h1() {
+    declare border padding text
+    border='\e[1;34m'"$(printf '=%.0s' $(seq 1 "$term_width"))"'\e[0m'
+    padding="$(printf ' %.0s' $(seq 1 $(((term_width - $(wc -m <<<"$*")) / 2))))"
+    text="\\e[1m$*\\e[0m"
+    echo -e "$border"
+    echo -e "${padding}${text}${padding}"
+    echo -e "$border"
+}
+
+h2() {
+    printf '\e[1;33m==>\e[37;1m %s\e[0m\n' "$*"
+}
+
+
+domain="$(hostname --domain)"
+
+
+h1 "Deploy example app"
+# deploy.
+kubectl apply -f - <<EOF
+---
+# see https://kubernetes.io/docs/concepts/services-networking/ingress/
+# see https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#ingress-v1-networking-k8s-io
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: example-app
+spec:
+  rules:
+    - host: example-app.$domain
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: example-app
+                port:
+                  name: web
+---
+# see https://kubernetes.io/docs/concepts/services-networking/service/
+# see https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#service-v1-core
+apiVersion: v1
+kind: Service
+metadata:
+  name: example-app
+spec:
+  selector:
+    app: example-app
+  type: ClusterIP
+  ports:
+    - name: web
+      protocol: TCP
+      port: 80
+      targetPort: web
+---
+# see https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
+# see https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#daemonset-v1-apps
+# see https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#podtemplatespec-v1-core
+# see https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#container-v1-core
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: example-app
+spec:
+  selector:
+    matchLabels:
+      app: example-app
+  template:
+    metadata:
+      labels:
+        app: example-app
+    spec:
+      nodeSelector:
+        kubernetes.io/os: linux
+      containers:
+        - name: example-app
+          image: ruilopes/example-docker-buildx-go:v1.2.0
+          args:
+            - -listen=:8000
+          ports:
+            - name: web
+              containerPort: 8000
+          resources:
+            requests:
+              memory: 20Mi
+              cpu: "0.1"
+            limits:
+              memory: 20Mi
+              cpu: "0.1"
+EOF