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健康检查

2024年07月18日
柏拉文
越努力，越幸运

一、认识​

基于 HEALTHCHECK 指令来实现 Docker 容器的健康检查

二、语法​

2.1 HEALTHCHECK --interval=30s CMD xxx​

HEALTHCHECK --interval=30s CMD xxx

  1. HEALTHCHECK --interval=30s CMD curl -f http://localhost:3000 || exit 1

2.2 HEALTHCHECK --interval=30s --timeout=3s CMD xxx​

HEALTHCHECK --interval=30s --timeout=3s CMD xxx

  1. HEALTHCHECK --interval=30s --timeout=3s CMD curl -f http://localhost:3000 || exit 1

2.3 HEALTHCHECK --interval=30s --timeout=3s --retries=N CMD xxx​

HEALTHCHECK --interval=30s --timeout=3s --retries=N CMD xxx

三、测试​

3.1 测试 Node​

index.js

const http = require("http");
const PORT = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader("Content-Type", "text/plain");
  res.end(`Hello from Node.js`);
});

server.listen(PORT, () => {
  console.log(`Server running at port ${PORT}`);
});

Dockerfile

FROM node:latest
WORKDIR /app
COPY . /app 
EXPOSE 3000
HEALTHCHECK --interval=5s --timeout=3s --retries=3 CMD curl -f http://localhost:3000 || exit 1
CMD ["node","index.js"]

通过 docker inspect node 或者 docker ps 来查看健康状态