aula-04: Adicionar setup.sh para NGINX Ingress com Lua snippets

Automatiza a instalação do NGINX Ingress Controller com configuração
necessária para suportar server-snippet com Lua (Keep Request pattern).

aula-04/setup.sh

@@ -0,0 +1,176 @@
+#!/bin/bash
+# =============================================================================
+# Setup da Aula 04 - NGINX Ingress com Keep Request (Lua)
+# =============================================================================
+#
+# Este script instala e configura:
+#   1. NGINX Ingress Controller
+#   2. Aplicacao node-bugado com Ingress usando padrao Keep Request
+#
+# Pre-requisitos:
+#   - Kubernetes cluster rodando (OrbStack, Docker Desktop, minikube, etc)
+#   - kubectl configurado
+#   - Helm 3.x instalado
+#
+# Uso:
+#   chmod +x setup.sh
+#   ./setup.sh
+#
+# =============================================================================
+
+set -e  # Para na primeira falha
+
+# Cores para output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+# Funcoes de log
+log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
+log_success() { echo -e "${GREEN}[OK]${NC} $1"; }
+log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
+log_error() { echo -e "${RED}[ERRO]${NC} $1"; }
+
+# Diretorio do script
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# =============================================================================
+# VERIFICACOES INICIAIS
+# =============================================================================
+
+log_info "Verificando pre-requisitos..."
+
+# Verificar kubectl
+if ! command -v kubectl &> /dev/null; then
+    log_error "kubectl nao encontrado. Instale o kubectl primeiro."
+    exit 1
+fi
+log_success "kubectl encontrado"
+
+# Verificar conexao com cluster
+if ! kubectl cluster-info &> /dev/null; then
+    log_error "Nao foi possivel conectar ao cluster Kubernetes."
+    exit 1
+fi
+log_success "Conectado ao cluster Kubernetes"
+
+# Verificar helm
+if ! command -v helm &> /dev/null; then
+    log_error "Helm nao encontrado. Instale o Helm >= 3.14 primeiro."
+    log_info "Instalacao: https://helm.sh/docs/intro/install/"
+    exit 1
+fi
+log_success "Helm $(helm version --short) encontrado"
+
+echo ""
+
+# =============================================================================
+# 1. INSTALAR NGINX INGRESS (se nao existir)
+# =============================================================================
+
+log_info "=== Verificando NGINX Ingress ==="
+
+if kubectl get ingressclass nginx &> /dev/null; then
+    log_success "NGINX Ingress ja esta instalado"
+else
+    log_info "Instalando NGINX Ingress Controller..."
+    helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx 2>/dev/null || true
+    helm repo update
+
+    helm install nginx-ingress ingress-nginx/ingress-nginx \
+        --namespace ingress-nginx \
+        --create-namespace \
+        --set controller.allowSnippetAnnotations=true \
+        --set controller.config.annotations-risk-level=Critical \
+        --wait
+
+    log_success "NGINX Ingress instalado"
+fi
+
+# Aguardar controller ficar pronto
+log_info "Aguardando NGINX Ingress Controller ficar pronto..."
+kubectl wait --for=condition=ready pod \
+    -l app.kubernetes.io/component=controller \
+    -n ingress-nginx \
+    --timeout=120s 2>/dev/null || log_warn "Timeout aguardando controller"
+
+log_success "NGINX Ingress Controller esta rodando"
+echo ""
+
+# =============================================================================
+# 2. APLICAR MANIFESTOS DA APLICACAO
+# =============================================================================
+
+log_info "=== Aplicando manifestos da aplicacao ==="
+
+log_info "Aplicando ConfigMap..."
+kubectl apply -f "$SCRIPT_DIR/configmap.yaml"
+
+log_info "Aplicando Deployment..."
+kubectl apply -f "$SCRIPT_DIR/deployment.yaml"
+
+log_info "Aplicando Service..."
+kubectl apply -f "$SCRIPT_DIR/service.yaml"
+
+log_info "Aplicando Ingress..."
+kubectl apply -f "$SCRIPT_DIR/ingress-nginx.yaml"
+
+log_success "Todos os manifestos aplicados!"
+echo ""
+
+# =============================================================================
+# 3. AGUARDAR PODS FICAREM PRONTOS
+# =============================================================================
+
+log_info "=== Aguardando aplicacao ficar pronta ==="
+
+log_info "Aguardando pods da aplicacao..."
+kubectl wait --for=condition=ready pod \
+    -l app=node-bugado \
+    --timeout=120s
+
+log_success "Aplicacao esta rodando!"
+echo ""
+
+# =============================================================================
+# RESUMO FINAL
+# =============================================================================
+
+echo "=============================================="
+echo -e "${GREEN}  Setup Completo!${NC}"
+echo "=============================================="
+echo ""
+echo "Componentes instalados:"
+echo "  - NGINX Ingress Controller (namespace: ingress-nginx)"
+echo "  - Aplicacao node-bugado (namespace: default)"
+echo "    - 5 replicas com readiness/liveness probes"
+echo "    - Ingress com padrao Keep Request (Lua)"
+echo ""
+echo "Acesso:"
+echo "  URL: http://localhost"
+echo ""
+echo "Comandos uteis:"
+echo "  # Ver pods da aplicacao"
+echo "  kubectl get pods -l app=node-bugado"
+echo ""
+echo "  # Ver ingress"
+echo "  kubectl get ingress"
+echo ""
+echo "  # Teste de stress (100 requisicoes)"
+echo "  ./teste-stress.sh http://localhost 100"
+echo ""
+echo "  # Monitorar pods em tempo real"
+echo "  watch kubectl get pods -l app=node-bugado"
+echo ""
+echo "=============================================="
+echo ""
+
+# Mostrar status atual
+log_info "Status atual:"
+echo ""
+kubectl get pods -l app=node-bugado
+echo ""
+kubectl get ingress
+echo ""