如何在Docker容器中配置Nginx代理服务器以支持Web服务的健康检查？

FROM nginx

# 将自定义的配置文件复制到容器中
COPY nginx.conf /etc/nginx/nginx.conf

# 将健康检查脚本复制到容器中
COPY check.sh /etc/nginx/check.sh

# 添加执行权限
RUN chmod +x /etc/nginx/check.sh

# 设置容器启动时执行的命令
CMD /etc/nginx/check.sh && nginx -g "daemon off;"

user  nginx;
worker_processes  1;

events {
    worker_connections  1024;
}

http {
    upstream backend {
        server app1:8080;
        server app2:8080;
    }

    server {
        listen 80;
        server_name localhost;

        location / {
            proxy_pass http://backend;
        }

        location /health {
            return 200;
        }
    }
}

#!/bin/bash

# 要检查的服务器地址
HOST=localhost
# 要检查的服务器端口
PORT=80

# 循环检查服务是否正常，直到服务启动成功或超过最大重试次数
for i in {1..10}
do
    # 请求服务的健康检查路径，并获取返回的HTTP状态码
    STATUS=$(curl -LI "$HOST:$PORT/health" -o /dev/null -w '%{http_code}
' -s)

    # 如果HTTP状态码为200，证明服务正常，退出脚本
    if [ $STATUS -eq 200 ]; then
        echo "Health check passed, Nginx is up and running."
        exit 0
    fi

    echo "Waiting for Nginx to start..."
    sleep 1
done

# 如果超过重试次数，打印错误信息并退出脚本
echo "Health check failed, Nginx failed to start."
exit 1

docker build -t my-nginx .
docker run -d -p 8080:80 --name my-nginx-container my-nginx