How to configure Nginx proxy server in Docker container to support health check of web service?

How to configure Nginx proxy server in Docker container to support health check of web service?

When using Docker containers to deploy web services, in order to ensure the high availability and stability of the service, it is usually necessary to configure health checks to detect and handle faults in a timely manner. As a high-performance reverse proxy server, Nginx is very convenient and practical to configure health checks in Docker containers. This article will introduce how to configure the Nginx proxy server in a Docker container to support health checking of web services.

The steps are as follows:

1. Create a Dockerfile

First you need to create a Dockerfile to build the Nginx container. In the file, add the following content:

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;"

2. Create a custom Nginx configuration file

Create a custom Nginx configuration file nginx as needed. conf. This file determines the configuration of Nginx's proxy rules and health checks.

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;
        }
    }
}

In the configuration file, we use a simple upstream that defines two backend services, where app1 and app2 are the container names of the two backend services respectively. In location/health, we define a health check path. When the request returns 200, it proves that the service is normal.

3. Create a health check script

In containers, it is common practice to perform health checks through scripts. Create a file named check.sh in the container and add the following content:

#!/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

4. Build and run the Nginx container

After completing the above steps , use the following command to build and run the Nginx container:

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

With the above command, we built an image named my-nginx and ran a container named my-nginx-container.

Summary

Through the above steps, we successfully configured the Nginx proxy server in the Docker container and added the health check function. By regularly sending HTTP requests to the health check path, we can determine whether the service is working properly. This configuration can greatly improve the availability and stability of web services. If necessary, more configurations and optimizations can be made based on actual needs.

Hope this article is helpful to you in configuring Nginx proxy server in Docker container to support health check of web services!

The above is the detailed content of How to configure Nginx proxy server in Docker container to support health check of web service?. For more information, please follow other related articles on the PHP Chinese website!