# 使用轻量级的 Nginx 镜像
FROM nginx:alpine

ARG NGINX_CONF=nginx.conf

RUN rm -f /etc/nginx/conf.d/default.conf
COPY ${NGINX_CONF} /etc/nginx/conf.d/default.conf

COPY dist /usr/share/nginx/html

EXPOSE 8088

# 安装 getent 依赖（Alpine 自带）
# 创建启动脚本：轮询等待后端 DNS 解析成功后再启动 nginx
RUN printf "#!/bin/sh\n\
echo \"Waiting for upstream besure-server-inner to resolve...\"\n\
while ! getent hosts besure-server-inner > /dev/null 2>&1; do\n\
  sleep 2\n\
done\n\
echo \"Upstream resolved! Starting nginx...\"\n\
nginx -g \"daemon off;\"\n" > /start.sh && \
    chmod +x /start.sh

CMD ["/start.sh"]