90 lines
3.0 KiB
Markdown
90 lines
3.0 KiB
Markdown
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<!-- Space: qifu -->
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<!-- Parent: 后端技术&知识&规范 -->
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<!-- Parent: 技术方案 -->
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<!-- Parent: 基建 -->
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<!-- Parent: 02-技术方案 -->
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<!-- Title: 20250110-K8s健康检查技术方案 -->
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<!-- Include: 杂项/声明文件.md -->
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<!-- :toc: -->
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# K8s健康检查技术方案
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## K8s 探针
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- [K8s配置存活、就绪和启动探针](https://kubernetes.io/zh-cn/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/)
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- 使用 httpGet 方式，请求 `/actuator/health` 做服务就绪检查
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## 后端健康检查接口
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- 使用 `Filter` 实现健康检查接口处理
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- 代码集成在 `web-core` 中
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- 代码示例：
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```java
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package com.yuanmeng.engine.web.core.config;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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import org.springframework.boot.web.servlet.FilterRegistrationBean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.core.Ordered;
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import org.springframework.http.HttpStatus;
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import javax.servlet.*;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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@Configuration
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@ConditionalOnProperty(prefix = "yuanmeng.web-core", name = "enable-health-check", matchIfMissing = true)
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public class HealthCheckFilterConfig {
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@Bean
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public FilterRegistrationBean<HealthCheckFilter> healthCheckFilter() {
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FilterRegistrationBean<HealthCheckFilter> registrationBean = new FilterRegistrationBean<>();
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registrationBean.setFilter(new HealthCheckFilter());
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registrationBean.addUrlPatterns("/actuator/health");
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registrationBean.setOrder(Ordered.HIGHEST_PRECEDENCE);
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return registrationBean;
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}
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@Slf4j
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public static class HealthCheckFilter implements Filter {
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@Override
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public void init(FilterConfig filterConfig) {
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log.info("[web-core]: HealthCheckFilter init");
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
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throws IOException, ServletException {
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HttpServletRequest httpRequest = (HttpServletRequest) request;
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HttpServletResponse httpResponse = (HttpServletResponse) response;
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if (httpRequest.getRequestURI().contains("/actuator/health")) {
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log.info("[web-core]: receive health check");
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httpResponse.setStatus(HttpStatus.OK.value());
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httpResponse.getWriter().write("{\"status\":\"UP\"}");
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} else {
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chain.doFilter(request, response);
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}
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}
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}
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}
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```
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