vagrant-lab-k8s/provision/example-app.sh

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#!/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