[FEAT] Implement part3

p3/Makefile

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+SHELL := /bin/bash
+
+CLUSTER_NAME        ?= mycluster
+ARGOCD_HOST_PORT    ?= 8080
+APP_HOST_PORT       ?= 8888
+BOOTSTRAP_SCRIPT    ?= tools/bootstrap_argocd.sh
+
+KUBECTL             ?= kubectl
+K3D                 ?= k3d
+
+.PHONY: all clean fclean re
+
+all:
+	@echo "==> Running bootstrap with CLUSTER_NAME=$(CLUSTER_NAME) ARGOCD_HOST_PORT=$(ARGOCD_HOST_PORT) APP_HOST_PORT=$(APP_HOST_PORT)"
+	@CLUSTER_NAME="$(CLUSTER_NAME)" ARGOCD_HOST_PORT="$(ARGOCD_HOST_PORT)" APP_HOST_PORT="$(APP_HOST_PORT)" "$(BOOTSTRAP_SCRIPT)"
+
+## Remove app + Argo CD namespaces (cluster remains)
+clean:
+	@echo "==> Deleting Argo CD Application (if any) and namespaces (argocd, dev)"
+	-@$(KUBECTL) -n argocd delete application p3-dev 2>/dev/null || true
+	-@$(KUBECTL) delete ns dev argocd 2>/dev/null || true
+	@echo "==> Clean done (cluster '$(CLUSTER_NAME)' still present)"
+
+## Full clean: clean + delete k3d cluster
+fclean: clean
+	@echo "==> Deleting k3d cluster '$(CLUSTER_NAME)'"
+	-@$(K3D) cluster delete "$(CLUSTER_NAME)" 2>/dev/null || true
+	@echo "==> Full clean done"
+
+## Rebuild from scratch
+re: fclean all

p3/manifests/argocd/application-dev.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: p3-dev
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/42-CC-RNCP/Inception-of-Things.git
+    targetRevision: lea/p3
+    path: p3/manifests/dev
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: dev
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true

p3/manifests/dev/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: wil-playground
+  namespace: dev
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: wil-playground
+  template:
+    metadata:
+      labels:
+        app: wil-playground
+    spec:
+      containers:
+        - name: app
+          image: wil42/playground:v1
+          ports:
+            - containerPort: 8888
+          imagePullPolicy: IfNotPresent

p3/manifests/dev/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - deployment.yaml
+  - service.yaml
+images:
+  - name: wil42/playground
+    newTag: v1

p3/manifests/dev/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: playground-svc
+  namespace: dev
+spec:
+  selector:
+    app: wil-playground
+  ports:
+    - port: 8888
+      targetPort: 8888
+      protocol: TCP
+  type: LoadBalancer

p3/tools/bootstrap_argocd.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# =========================
+# Helpers
+# =========================
+log()  { echo -e "👉 \e[1m$*\e[0m"; }
+ok()   { echo -e "✅ $*"; }
+warn() { echo -e "⚠️  $*"; }
+die()  { echo -e "❌ $*" >&2; exit 1; }
+
+# =========================
+# Config
+# =========================
+CLUSTER_NAME="${CLUSTER_NAME:-mycluster}"
+ARGOCD_INSTALL_URL=${ARGOCD_INSTALL_URL:-"https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml"}
+ARGOCD_HOST_PORT="${ARGOCD_HOST_PORT:-8080}"   # maps to cluster LB :8443
+APP_HOST_PORT="${APP_HOST_PORT:-8888}"         # maps to cluster LB :8888
+ARGOCD_MANIFESTS_DIR="${ARGOCD_MANIFESTS_DIR:-manifests/argocd}"
+
+# =========================
+# Pre-flight
+# =========================
+need() { command -v "$1" >/dev/null 2>&1 || die "Missing command: $1"; }
+
+ensure_docker_ready() {
+  need docker
+  if ! systemctl is-active --quiet docker; then
+    log "Starting Docker service..."
+    sudo systemctl enable --now docker
+  fi
+  if ! id -nG "$USER" | grep -qw docker; then
+    die "Current user is not in the 'docker' group. Run: sudo usermod -aG docker $USER && re-login (or run 'newgrp docker')."
+  fi
+  docker ps >/dev/null 2>&1 || die "Cannot connect to Docker daemon. Check /var/run/docker.sock permissions."
+}
+
+ensure_k3d_cluster_with_ports() {
+  need k3d
+  if k3d cluster list | awk 'NR>1 {print $1}' | grep -qx "${CLUSTER_NAME}"; then
+    warn "Detected existing k3d cluster: ${CLUSTER_NAME}"
+    local lb_name="k3d-${CLUSTER_NAME}-serverlb"
+    local lb_id; lb_id=$(docker ps -q -f "name=^/${lb_name}$" || true)
+    if [[ -z "${lb_id}" ]]; then
+      warn "Server LB container '${lb_name}' not found; possibly old k3d or custom setup."
+    else
+      local ports; ports=$(docker port "${lb_id}" || true)
+      echo "${ports}"
+      if ! grep -q "${ARGOCD_HOST_PORT}.*->" <<<"${ports}" || ! grep -q "${APP_HOST_PORT}.*->" <<<"${ports}"; then
+        warn "Existing cluster lacks required host port mappings:"
+        warn "  Need host ${ARGOCD_HOST_PORT} → LB:8443 and host ${APP_HOST_PORT} → LB:8888"
+        warn "Consider recreating the cluster:"
+        warn "  k3d cluster delete ${CLUSTER_NAME} && \\"
+        warn "  k3d cluster create ${CLUSTER_NAME} --wait \\"
+        warn "    --port \"${ARGOCD_HOST_PORT}:8443@loadbalancer\" \\"
+        warn "    --port \"${APP_HOST_PORT}:8888@loadbalancer\""
+      else
+        ok "Existing cluster has required host port mappings."
+      fi
+    fi
+    return
+  fi
+
+  log "Creating k3d cluster '${CLUSTER_NAME}' with host port mappings..."
+  k3d cluster create "${CLUSTER_NAME}" --wait \
+    --port "${ARGOCD_HOST_PORT}:8443@loadbalancer" \
+    --port "${APP_HOST_PORT}:8888@loadbalancer"
+  ok "k3d cluster created."
+}
+
+# =========================
+# Waiters (ServiceLB: svclb-*)
+# =========================
+wait_svclb_ready() {
+  local ns="$1"; local svc="$2"; local timeout="${3:-300}"
+  log "Waiting for ServiceLB helper pod 'svclb-${svc}-*' in namespace '${ns}' (timeout ${timeout}s)..."
+  local end=$((SECONDS+timeout))
+  while (( SECONDS <= end )); do
+    local lines
+    lines="$(kubectl -n "${ns}" get pods --no-headers 2>/dev/null | awk '/^svclb-'"${svc}"'-/ {print $1, $2, $3}')"
+    if [[ -n "${lines}" ]]; then
+      local notready
+      notready="$(awk '$2!="1/1" || $3!="Running" {print $0}' <<<"${lines}" || true)"
+      if [[ -z "${notready}" ]]; then
+        ok "ServiceLB helper for '${svc}' is Running."
+        return 0
+      fi
+    fi
+    sleep 3
+  done
+  die "ServiceLB helper for '${svc}' not ready within ${timeout}s"
+}
+
+# =========================
+# Argo CD
+# =========================
+bootstrap_argocd() {
+  log "Creating namespaces (argocd, dev)..."
+  kubectl create ns argocd --dry-run=client -o yaml | kubectl apply -f -
+  kubectl create ns dev     --dry-run=client -o yaml | kubectl apply -f -
+  ok "Namespaces ready."
+
+  log "Installing Argo CD (in-cluster)..."
+  kubectl apply -n argocd -f "${ARGOCD_INSTALL_URL}"
+
+  log "Waiting for argocd-server to be ready (up to 5 minutes)..."
+  kubectl rollout status deploy/argocd-server -n argocd --timeout=300s || true
+
+  # Make argocd-server Service type=LoadBalancer and add port 8443
+  log "Exposing argocd-server as LoadBalancer and adding 8443 port..."
+  kubectl -n argocd patch svc argocd-server -p '{"spec":{"type":"LoadBalancer"}}' >/dev/null
+  kubectl -n argocd patch svc argocd-server --type merge -p '{
+    "spec": {
+      "type": "LoadBalancer",
+      "ports": [
+        {"name":"https-alt","port":8443,"targetPort":8080}
+      ]
+    }
+  }' >/dev/null
+
+
+  # wait svclb_ready or it will get connection refused
+  wait_svclb_ready kube-system argocd-server 300
+
+  log "Retrieving Argo CD initial admin password..."
+  ARGOCD_ADMIN_PASSWORD=$(kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d)
+  ok "Argo CD UI: https://localhost:${ARGOCD_HOST_PORT}   (user: admin, password: ${ARGOCD_ADMIN_PASSWORD})"
+
+  # apply Application
+  log "Applying Argo CD Application (dev/playground)..."
+  kubectl apply -f "${ARGOCD_MANIFESTS_DIR}/application-dev.yaml"
+  ok "Application applied."
+
+  if kubectl -n dev get deploy playground >/dev/null 2>&1; then
+    log "Waiting for Deployment 'playground' Available..."
+    kubectl -n dev wait --for=condition=available deploy/playground --timeout=300s || true
+  else
+    warn "Deployment 'playground' not found yet; will continue and rely on Argo CD sync."
+  fi
+
+  # wait svclb_ready or it will get connection refused
+  wait_svclb_ready kube-system playground-svc 300
+
+  ok "Playground app: http://localhost:${APP_HOST_PORT}"
+}
+
+# =========================
+# Main
+# =========================
+need kubectl
+ensure_docker_ready
+ensure_k3d_cluster_with_ports
+bootstrap_argocd
+ok "All done 🎉  Open: https://localhost:${ARGOCD_HOST_PORT} and http://localhost:${APP_HOST_PORT}"