# 2. 实施步骤
# 步骤1：部署Java应用
# 步骤2：优化JVM参数
# 步骤3：优化Tomcat配置
# 步骤4：优化代码
# 步骤5：验证性能改进

# 3. 应用效果
# 提高了应用的性能
# 减少了响应时间
# 提高了系统的可靠性

# 部署Java应用
dnf install -y java-11-openjdk-devel maven

# 构建应用
mvn clean package

# 优化JVM参数
cat > /etc/systemd/system/myapp.service << 'EOF' [Unit] Description=My Spring Boot Application After=network.target [Service] Type=simple User=myapp ExecStart=/usr/bin/java -Xms4G -Xmx8G -XX:+UseG1GC -XX:MaxGCPauseMillis=200 -XX:ParallelGCThreads=8 -XX:ConcGCThreads=2 -XX:InitiatingHeapOccupancyPercent=70 -jar /opt/myapp/myapp.jar Restart=on-failure [Install] WantedBy=multi-user.target EOF # 启动应用服务 systemctl daemon-reload systemctl start myapp systemctl enable myapp # 优化Tomcat配置（如果使用Tomcat） cat > /etc/tomcat/server.xml << 'EOF'

EOF

# 重启Tomcat服务
systemctl restart tomcat

# 优化代码
# 示例：使用缓存减少数据库访问
@RestController
@RequestMapping(“/users”)
public class UserController {

@Autowired
private UserService userService;

@Autowired
private CacheManager cacheManager;

@GetMapping(“/{id}”)
public User getUser(@PathVariable Long id) {
Cache cache = cacheManager.getCache(“users”);
User user = cache.get(id, User.class);
if (user == null) {
user = userService.findById(id);
cache.put(id, user);
}
return user;
}
}

# 验证性能改进
# 测试响应时间
ab -n 1000 -c 100 http://localhost:8080/users/1

# 查看JVM状态
jstat -gc $(pgrep -f myapp.jar) 1000 10

# 查看应用日志
tail -f /var/log/myapp.log

# 2. 实施步骤
# 步骤1：部署Python应用
# 步骤2：优化Gunicorn配置
# 步骤3：优化代码
# 步骤4：使用缓存
# 步骤5：验证性能改进

# 3. 应用效果
# 提高了应用的性能
# 减少了响应时间
# 提高了系统的可靠性

# 部署Python应用
dnf install -y python3 python3-pip

# 安装依赖
pip3 install fastapi gunicorn uvicorn redis

# 创建应用
cat > app.py << 'EOF' from fastapi import FastAPI import redis app = FastAPI() r = redis.Redis(host='localhost', port=6379, db=0) @app.get("/users/{id}") async def get_user(id: int): # 尝试从缓存获取 user = r.get(f"user:{id}") if user: return {"id": id, "name": user.decode()} # 从数据库获取（模拟） user_name = f"User {id}" # 存入缓存 r.set(f"user:{id}", user_name, ex=3600) return {"id": id, "name": user_name} EOF # 优化Gunicorn配置 cat > gunicorn.conf.py << 'EOF' bind = "0.0.0.0:8000" workers = 4 worker_class = "uvicorn.workers.UvicornWorker" threads = 2 timeout = 30 keepalive = 2 max_requests = 10000 max_requests_jitter = 1000 EOF # 启动应用 gunicorn -c gunicorn.conf.py app:app # 优化代码 # 示例：使用异步处理提高并发能力 @app.get("/users/{id}") async def get_user(id: int): # 尝试从缓存获取 user = await r.get(f"user:{id}") if user: return {"id": id, "name": user.decode()} # 从数据库获取（模拟） user_name = f"User {id}" # 存入缓存 await r.set(f"user:{id}", user_name, ex=3600) return {"id": id, "name": user_name} # 验证性能改进 # 测试响应时间 ab -n 1000 -c 100 http://localhost:8000/users/1 # 查看Gunicorn状态 ps aux | grep gunicorn # 查看应用日志 tail -f gunicorn.log

# 2. 实施步骤
# 步骤1：部署Node.js应用
# 步骤2：优化PM2配置
# 步骤3：优化代码
# 步骤4：使用缓存
# 步骤5：验证性能改进

# 3. 应用效果
# 提高了应用的性能
# 减少了响应时间
# 提高了系统的可靠性

# 部署Node.js应用
dnf install -y nodejs npm

# 安装依赖
npm install express pm2 redis

# 创建应用
cat > app.js << 'EOF' const express = require('express'); const redis = require('redis'); const app = express(); const client = redis.createClient(); app.get('/users/:id', async (req, res) => {
const id = req.params.id;
// 尝试从缓存获取
client.get(`user:${id}`, (err, user) => {
if (user) {
return res.json({ id, name: user });
}
// 从数据库获取（模拟）
const user_name = `User ${id}`;
// 存入缓存
client.set(`user:${id}`, user_name, ‘EX’, 3600);
res.json({ id, name: user_name });
});
});

app.listen(3000, () => {
console.log(‘Server is running on port 3000’);
});
EOF

# 优化PM2配置
cat > ecosystem.config.js << 'EOF' module.exports = { apps : [ { name: 'myapp', script: 'app.js', instances: 'max', exec_mode: 'cluster', max_memory_restart: '1G', env: { NODE_ENV: 'production' } } ] }; EOF # 启动应用 pm install -g pm2 pm run build pm start # 优化代码 # 示例：使用异步处理提高并发能力 app.get('/users/:id', async (req, res) => {
const id = req.params.id;
try {
// 尝试从缓存获取
const user = await new Promise((resolve, reject) => {
client.get(`user:${id}`, (err, user) => {
if (err) reject(err);
else resolve(user);
});
});
if (user) {
return res.json({ id, name: user });
}
// 从数据库获取（模拟）
const user_name = `User ${id}`;
// 存入缓存
await new Promise((resolve, reject) => {
client.set(`user:${id}`, user_name, ‘EX’, 3600, (err) => {
if (err) reject(err);
else resolve();
});
});
res.json({ id, name: user_name });
} catch (err) {
res.status(500).json({ error: err.message });
}
});

# 验证性能改进
# 测试响应时间
ab -n 1000 -c 100 http://localhost:3000/users/1

# 查看PM2状态
pm status

# 查看应用日志
pm logs