diff --git a/Makefile b/Makefile
index a8c1379..b032e9a 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,8 @@ ENV ?= prod
 COMPOSE_FILE = docker-compose.yml
 ENV_FILE = .env.$(ENV)
 
-PROJECT_NAME = attendancesystem-$(ENV)
+CONTAINER_POSTFIX := $(shell grep '^CONTAINER_POSTFIX=' $(ENV_FILE) 2>/dev/null | cut -d'=' -f2-)
+PROJECT_NAME = attendancesystem-$(ENV)$(if $(CONTAINER_POSTFIX),-$(CONTAINER_POSTFIX),)
 NETWORK_NAME = attendancesystem-network
 
 .PHONY: app install update reset-network nuke nuke-project
diff --git a/attendancesystem b/attendancesystem
new file mode 160000
index 0000000..f8238b9
--- /dev/null
+++ b/attendancesystem
@@ -0,0 +1 @@
+Subproject commit f8238b9ac3dee919ab7a5e5ada54d5f3d8ec6d14
diff --git a/docker-compose.yml b/docker-compose.yml
index b3290be..f4be348 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,6 +2,7 @@ services:
   # ================= BACKEND =================
 
   attendancesystem-api:
+    container_name: attendancesystem-api${CONTAINER_NAME_SUFFIX}
     image: ${DOCKER_REPO}/backend-attendance-system-api:${IMAGEM_RELEASE_1_3}
     profiles: ["app"]
     ports:
@@ -15,6 +16,7 @@ services:
 
   # ================= FRONTEND =================
   config-generator:
+    container_name: config-generator${CONTAINER_NAME_SUFFIX}
     image: alpine:${IMAGEM_LATEST}
     profiles: ["app"]
     environment:
@@ -39,6 +41,7 @@ services:
     restart: "no"
 
   attendancesystem-app:
+    container_name: attendancesystem-app${CONTAINER_NAME_SUFFIX}
     image: ${DOCKER_REPO}/attendancesystem-frontend:${IMAGEM_RELEASE_1_3}
     profiles: ["app"]
     volumes:
diff --git a/install.sh b/install.sh
index 985f2d4..e8cada1 100644
--- a/install.sh
+++ b/install.sh
@@ -91,6 +91,24 @@ ask() {
   eval "$varname=\"$value\""
 }
 
+ask_optional() {
+  # ask_optional <VARNAME> <prompt> [default]
+  local varname="$1"
+  local prompt="$2"
+  local default="$3"
+  local value=""
+
+  if [ -n "$default" ]; then
+    echo -ne "  ${BOLD}${prompt}${NC} ${DIM}[${default}]${NC} ${DIM}(ENTER para nenhum)${NC}: "
+  else
+    echo -ne "  ${BOLD}${prompt}${NC} ${DIM}(ENTER para nenhum)${NC}: "
+  fi
+
+  read -r value
+  value="${value:-$default}"
+  eval "$varname=\"$value\""
+}
+
 confirm() {
   echo -ne "  ${BOLD}$1${NC} ${CYAN}[s/N]${NC}: "
   read -r resp
@@ -233,6 +251,14 @@ collect_external_ports() {
   ask FRONTEND_ATTENDANCESYSTEM_APP_EXTERNAL_PORT "Frontend AttendanceSystem"     "${FRONTEND_ATTENDANCESYSTEM_APP_EXTERNAL_PORT:-$FRONTEND_ATTENDANCESYSTEM_APP_INTERNAL_PORT}"
 }
 
+collect_container_postfix() {
+  print_section "5. Identificador de instância (postfix dos containers)"
+  echo -e "  ${DIM}Distingue containers de múltiplas instalações na mesma máquina.${NC}"
+  echo -e "  ${DIM}Exemplo: 'cliente1' → 'attendancesystem-api-cliente1', etc.${NC}"
+  echo -e "  ${DIM}Deixe em branco para manter o comportamento padrão.${NC}\n"
+  ask_optional CONTAINER_POSTFIX "Postfix" "${CONTAINER_POSTFIX:-}"
+}
+
 # ══════════════════════════════════════════════════════════════
 # Wizard principal — coleta com navegação
 # ══════════════════════════════════════════════════════════════
@@ -256,6 +282,8 @@ collect_config() {
     FRONTEND_ATTENDANCESYSTEM_APP_EXTERNAL_PORT="$FRONTEND_ATTENDANCESYSTEM_APP_INTERNAL_PORT"
     print_ok "Portas externas definidas iguais às internas."
   fi
+
+  collect_container_postfix
 }
 
 # ══════════════════════════════════════════════════════════════
@@ -285,6 +313,13 @@ show_summary() {
     echo -e "      Backend  Attendance : ${BOLD}${BACKEND_ATTENDANCESYSTEM_API_EXTERNAL_PORT}${NC}"
     echo -e "      Frontend Attendance : ${BOLD}${FRONTEND_ATTENDANCESYSTEM_APP_EXTERNAL_PORT}${NC}"
     echo ""
+    echo -e "  ${BOLD}[5] Identificador de instância${NC}"
+    if [ -n "$CONTAINER_POSTFIX" ]; then
+      echo -e "      Postfix : ${BOLD}${CONTAINER_POSTFIX}${NC}"
+    else
+      echo -e "      Postfix : ${DIM}(nenhum — comportamento padrão)${NC}"
+    fi
+    echo ""
     echo -e "  ──────────────────────────────────────────────────────────────"
     echo -e "  ${GREEN}${BOLD}[C]${NC} Confirmar e continuar   ${RED}${BOLD}[X]${NC} Cancelar instalação"
     echo -e "  ──────────────────────────────────────────────────────────────"
@@ -297,6 +332,7 @@ show_summary() {
       2) collect_system_base ;;
       3) collect_internal_ports ;;
       4) collect_external_ports ;;
+      5) collect_container_postfix ;;
       C) break ;;
       X)
         echo ""
@@ -304,7 +340,7 @@ show_summary() {
         exit 0
         ;;
       *)
-        print_warn "Opção inválida. Digite 1-4, C ou X."
+        print_warn "Opção inválida. Digite 1-5, C ou X."
         ;;
     esac
   done
@@ -321,6 +357,8 @@ generate_envs() {
   local SYSTEM_BASE_CONN="${SYSTEM_BASE_HOST}:${SYSTEM_BASE_PORT}"
   local KEEPALIVE_BACKEND="${EXTERNAL_HOST}:${BACKEND_ATTENDANCESYSTEM_API_EXTERNAL_PORT}"
   local KEEPALIVE_FRONTEND="${EXTERNAL_HOST}:${FRONTEND_ATTENDANCESYSTEM_APP_EXTERNAL_PORT}"
+  local CONTAINER_NAME_SUFFIX=""
+  [ -n "$CONTAINER_POSTFIX" ] && CONTAINER_NAME_SUFFIX="-${CONTAINER_POSTFIX}"
 
   cat > "$BASE_DIR/.env.prod" <<EOF
 ASPNETCORE_ENVIRONMENT=Production
@@ -353,6 +391,10 @@ FRONTEND_ATTENDANCESYSTEM_APP_EXTERNAL_PORT=${FRONTEND_ATTENDANCESYSTEM_APP_EXTE
 # ── Keepalive ─────────────────────────────────────────────
 KEEPALIVE_ATTENDANCE_SYSTEM_BACKEND_HOST=${KEEPALIVE_BACKEND}
 KEEPALIVE_ATTENDANCE_SYSTEM_FRONTEND_HOST=${KEEPALIVE_FRONTEND}
+
+# ── Identificador de instância ────────────────────────────
+CONTAINER_POSTFIX=${CONTAINER_POSTFIX}
+CONTAINER_NAME_SUFFIX=${CONTAINER_NAME_SUFFIX}
 EOF
   print_ok ".env.prod gerado"
 }