数据库初始化慢导致，微服务docker启动模式，gateway和前端无法访问实例接口(网关轮询nacos就绪再启动、暴露nacos控制台18080、前端nginx动态DNS解析)

docker-compose-cloud.yml

@@ -48,6 +48,7 @@ services:
       context: ./jeecg-boot/jeecg-server-cloud/jeecg-cloud-nacos
     ports:
       - 8848:8848
+      - 18080:18080
     container_name: jeecg-boot-nacos
     depends_on:
       - jeecg-boot-mysql
@@ -93,6 +94,19 @@ services:
       - jeecg-boot-system
     container_name: jeecg-boot-gateway
     hostname: jeecg-boot-gateway
+    # 首次启动关键：主动轮询nacos，直到 jeecg-system 注册为健康实例再启动网关，
+    # 避免网关先于system注册而拿到空路由（swagger空、前端调不到后台，需手动重启网关）
+    # 注意：Nacos 3.x 已移除 v1/v2 open-api，实例查询需使用 v3 admin 接口
+    command:
+      - sh
+      - -c
+      - |
+        echo 'waiting for jeecg-system to register in nacos...';
+        until curl -s 'http://jeecg-boot-nacos:8848/nacos/v3/admin/ns/instance/list?serviceName=jeecg-system&groupName=DEFAULT_GROUP' | grep -q '"healthy":true'; do
+          sleep 5;
+        done;
+        echo 'jeecg-system is registered, starting gateway.';
+        exec java -Djava.security.egd=file:/dev/./urandom -jar jeecg-cloud-gateway-3.9.3.jar
     networks:
       - jeecg-boot
 

jeecgboot-vue3/Dockerfile.cloud

@@ -4,8 +4,12 @@ VOLUME /tmp
 ENV LANG en_US.UTF-8
 RUN echo "server {  \
                       listen       80; \
+                      #使用docker内嵌DNS运行时解析，避免gateway容器重启换IP后nginx缓存旧IP导致502 \
+                      resolver 127.0.0.11 valid=10s ipv6=off; \
                       location   /jeecgboot/ { \
-                      proxy_pass              http://jeecg-boot-gateway:9999/; \
+                      set \$jeecg_gateway jeecg-boot-gateway; \
+                      rewrite ^/jeecgboot/?(.*)\$ /\$1 break; \
+                      proxy_pass              http://\$jeecg_gateway:9999; \
                       proxy_redirect          off; \
                       proxy_set_header        Host jeecg-boot-system; \
                       proxy_set_header        X-Real-IP \$remote_addr; \