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Linux系统后台运行应用三板斧

  • 2026-01-31 19:11:19
Linux系统后台运行应用三板斧

第一板斧:& 符号(直接后台运行)

在命令末尾添加 &,将进程放入后台运行:

python app.py &

特点:

立即返回终端控制权

输出仍会显示在当前终端

关闭终端或退出登录可能导致进程终止(除非配合 nohup)

查看后台任务

jobs -l

将后台任务调回前台

fg %任务号

第二板斧:nohup(脱离终端运行)

使用 nohup 使进程忽略挂断信号,搭配 & 实现完全后台运行:

nohup python app.py > output.log 2>&1 &

参数解释:

nohup:忽略挂断信号(SIGHUP)

> output.log:将标准输出重定向到文件

2>&1:将标准错误合并到标准输出

&:放入后台运行

查看进程

ps aux | grep app.py

终止进程

pkill -f app.py   # 或 kill PID

**第三板斧:screen / tmux(终端复用器)

创建虚拟终端会话,即使断开 SSH 连接进程仍继续运行:

screen 用法

screen -S session_name  # 创建新会话
python app.py           # 在会话中运行程序
Ctrl + A, D             # 分离会话(程序在后台运行)
screen -ls# 查看所有会话
screen -r session_name  # 恢复会话

tmux 用法(更现代)

tmux new -s session_name  # 创建会话
python app.py             # 运行程序
Ctrl + B, D               # 分离会话
tmux ls# 查看会话
tmux attach -t session_name  # 恢复会话

进阶选择:systemd(生产环境推荐)

对于需要持续运行的服务,建议使用 systemd 管理:

sudovim /etc/systemd/system/myapp.service

配置文件示例:

[Unit]
Description=My Application

[Service]
Type=simple
User=www-data
WorkingDirectory=/opt/myapp
ExecStart=/usr/bin/python app.py
Restart=always  # 崩溃时自动重启

[Install]
WantedBy=multi-user.target

常用命令

sudo systemctl start myapp    # 启动
sudo systemctl status myapp   # 查看状态
sudo systemctl enable myapp   # 设置开机自启

场景选择指南

  1. 临时测试:使用 & 或 nohup

  2. 交互式长任务:使用 screen/tmux

  3. 生产环境服务:使用 systemd 或 supervisor

  4. 容器环境:使用 Docker 等容器编排工具

注意事项

  • 使用 & 时,建议重定向输出避免干扰

  • 长时间运行的任务务必搭配 nohup 或终端复用器

  • 生产环境优先考虑进程监控和自动重启机制

  • 注意日志管理和磁盘空间监控

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  1. CONNECT:[ UseTime:0.000643s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000767s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003648s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004386s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000801s ]
  6. SELECT * FROM `set` [ RunTime:0.001421s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000704s ]
  8. SELECT * FROM `article` WHERE `id` = 470229 LIMIT 1 [ RunTime:0.009585s ]
  9. UPDATE `article` SET `lasttime` = 1770442362 WHERE `id` = 470229 [ RunTime:0.033373s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.005294s ]
  11. SELECT * FROM `article` WHERE `id` < 470229 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.036260s ]
  12. SELECT * FROM `article` WHERE `id` > 470229 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007786s ]
  13. SELECT * FROM `article` WHERE `id` < 470229 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018116s ]
  14. SELECT * FROM `article` WHERE `id` < 470229 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023441s ]
  15. SELECT * FROM `article` WHERE `id` < 470229 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.021580s ]
0.241241s