diff --git a/infrastructure/docker-compose.staging.yml b/infrastructure/docker-compose.staging.yml
index ef28eac..ae40ed2 100644
--- a/infrastructure/docker-compose.staging.yml
+++ b/infrastructure/docker-compose.staging.yml
@@ -74,7 +74,9 @@ services:
     ports:
       - "8081:8080"
     healthcheck:
-      test: ["CMD-SHELL", "curl -f http://localhost:8080/api/v1/health/ready || exit 1"]
+      # 探针用 127.0.0.1 而非 localhost：busybox wget 解析 localhost 时可能优先取 ::1，
+      # 而服务若只绑 IPv4 会导致探针假失败（本地栈的 nginx 已实测踩到）。
+      test: ["CMD-SHELL", "curl -f http://127.0.0.1:8080/api/v1/health/ready || exit 1"]
       interval: 30s
       timeout: 10s
       retries: 3
diff --git a/infrastructure/docker-compose.yml b/infrastructure/docker-compose.yml
index 2e022d1..b832cc9 100644
--- a/infrastructure/docker-compose.yml
+++ b/infrastructure/docker-compose.yml
@@ -85,7 +85,9 @@ services:
     ports:
       - "8085:8080"
     healthcheck:
-      test: ["CMD-SHELL", "wget -qO /dev/null http://localhost:8080/api/v1/health/live || exit 1"]
+      # 与 nginx 同理，用 127.0.0.1 而非 localhost：backend 当前恰好双栈监听（:::8080），
+      # 故 localhost 解析成 ::1 也能通；但探针不应依赖「服务恰好绑了 IPv6」这一偶然事实。
+      test: ["CMD-SHELL", "wget -qO /dev/null http://127.0.0.1:8080/api/v1/health/live || exit 1"]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -112,7 +114,13 @@ services:
     volumes:
       - ./nginx.conf:/etc/nginx/nginx.conf:ro
     healthcheck:
-      test: ["CMD-SHELL", "wget -qO /dev/null http://localhost/nginx-health || exit 1"]
+      # 探针地址必须写 127.0.0.1，不能写 localhost。
+      # 实测：nginx 的 `listen 80` 只绑 IPv4（容器内 netstat = 0.0.0.0:80），
+      # 而 /etc/hosts 中 `::1 localhost` 同样存在，busybox wget 解析 localhost 时优先取 ::1
+      # → 探针连 IPv6 回环被拒（Connection refused）→ 容器被标 unhealthy，
+      # 但服务其实完全正常（宿主 curl http://localhost:6688/nginx-health = 200）。
+      # 这是一类「探针与被探对象脱钩」的假告警，还会连带拖垮 depends_on: service_healthy。
+      test: ["CMD-SHELL", "wget -qO /dev/null http://127.0.0.1/nginx-health || exit 1"]
       interval: 30s
       timeout: 10s
       retries: 3