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掌握Linux后台进程管理:提升服务器稳定性的实战技巧

  • 2026-03-25 02:41:08
掌握Linux后台进程管理:提升服务器稳定性的实战技巧

链接:https://www.cnblogs.com/huangSir-devops/p/18839251

概念

当我们在终端或控制台工作时,可能不希望由于运行一个作业而占住了屏幕,因为可能还有更重要的事情要做,比如阅读电子邮件。对于密集访问磁盘的进程,我们更希望它能够在每天的非负荷高峰时间段运行(例如凌晨)。为了使这些进程能够在后台运行,也就是说不在终端屏幕上运行,有几种选择方法可供使用。

&方法

使用[shell] &可以使进程在后台运行,但是用户终端退出时,进程结束,也就是当你连接的终端断开时,你后台运行的服务、命令等自动停止例如:

||     || --- | --- ||| # ping www.baidu.com的返回信息会输出到ping.log日志文件中,最后输出的jobnumber和PID ||| root@master-01:~#  ping www.baidu.com &>> ping.log  & ||| [11254658 ||     |||| # 查看运行进程 ||| root@master-01:~# jobs ||| [1]+  Running                 ping www.baidu.com &>> ping.log & ||     | root@master-01:~# ps -aux \| grep ping ||     | root     1254658  0.0  0.0   9048  1344 pts/0    S    19:10   0:00 ping www.baidu.com |||     ||     |||| # 结束job,使用kill %jobid方式杀死job ||| root@master-01:~# kill %1 |

nohup方法,推荐使用!!!

使用&命令后,作业被提交到后台运行,当前控制台没有被占用,但是当前控制台关闭后,作业就会停止运行。nohup命令可以在你退出帐户之后继续运行相应的进程。nohup就是不挂起的意思( no hang up / ignoring hangup signals) 即 忽略挂起信号一直在后台执行。

语法:

|     |     || --- | --- ||     | nohup Command [ Arg … ][& ] |

示例:

||     || --- | --- ||| # 后台运行ping 作业,作业会将信息默认输出到当前目前下的nohup.out文件中 ||| root@master-01:~# nohup ping www.baidu.com & ||| [11266070 ||     | root@master-01:~# nohup: ignoring input and appending output to 'nohup.out' ||| # 这里要按一下回车 |||     ||     |||| # 查看作业 ||| root@master-01:~# jobs ||| [1]+  Running                 nohup ping www.baidu.com & ||     |||| # 查看nohup.out文件 ||| root@master-01:~# ll nohup.out ||| -rw------- 1 root root 1745Apr2119:23 nohup.out ||     |||| # 杀死作业 ||| root@master-01:~# kill %1 |||     ||     | # 查看作业是否退出 ||| root@master-01:~# jobs ||| [1]+  Terminated              nohup ping www.baidu.com ||     ||

nohup将信息输出到指定文件

语法:

|     |     || --- | --- ||     | nohupcommand >> myout.file 2>&1 & |

解析:

  • • command>>out.file是将command的输出重定向到out.file文件,即输出内容不打印到屏幕上,而是追加输出到out.file文件中。
  • • 2>&1 是将标准出错 重定向到标准输出,这里的标准输出已经重定向到了out.file文件,即将标准出错也输出到out.file文件中。最后一个&, 是让该命令在后台执行。

示例:

|     |     || --- | --- ||     | # ping命令输出到ping.log日志文件中 ||     | root@master-01:~# nohup ping www.baidu.com  >> ping.log  2>&1 & ||     | [11270295 ||     |     ||     | # 查看ping.log文件 ||     | root@master-01:~# tail -f ping.log ||     | 64 bytes from 182.61.200.110 (182.61.200.110): icmp_seq=1 ttl=48time=6.03 ms ||     | 64 bytes from 182.61.200.110 (182.61.200.110): icmp_seq=2 ttl=48time=5.99 ms ||     | 64 bytes from 182.61.200.110 (182.61.200.110): icmp_seq=3 ttl=48time=6.01 ms ||     | 64 bytes from 182.61.200.110 (182.61.200.110): icmp_seq=4 ttl=48time=6.01 ms ||     | 64 bytes from 182.61.200.110 (182.61.200.110): icmp_seq=5 ttl=48time=6.00 ms ||     |     ||     | # 杀掉作业进程 ||     | root@master-01:~# jobs ||     | [1]+  Running                 nohup ping www.baidu.com >> ping.log 2>&1 & ||     | root@master-01:~# kill %1 ||     | root@master-01:~# jobs ||     | [1]+  Terminated              nohup ping www.baidu.com >> ping.log 2>&1 |

前后台进程的切换和控制

CTRL+Z
键盘组合键可以使一个正在前台执行的命令放到后台,并且处于暂停状态bg可以将一个后台运行的命令变成在后台运行,如果后台有多个命令,可以用bg %jobnumber将选中的命令调出运行fg可以将后台的命令调至前台继续运行,如果后台有多个命令,可以用fg %jobnumber将选中的命令调出
image

screen方式

Screen是一个全屏窗口管理器,它在多个进程(通常是交互式shell)之间多路传输物理终端。

安装screen

|     ||| --- | --- ||     |# centos安装screen ||     | yum install -y screen |||     ||     |# 在Ubuntu上安装并使用screen ||     | sudo apt update -y  # 更新包列表 ||     | sudo apt install screen -y # 安装screen工具 |

使用方式

|     |     || --- | --- ||     | # 创建一个新的窗口 ||     | screen -S test ||     |     ||     | # 进入窗口后 执行文件 ||     | python test.py ||     |     ||     | # 退出当前窗口 ||     | ctrl+a+d   (方法1:保留当前窗口) ||     | screen -d  (方法2:保留当前窗口) ||     | exit       (方法3:退出程序,并关闭窗口) ||     |     ||     | # 查看窗口 ||     | screen -ls ||     |     ||     | # 重新连接窗口 ||     | screen -r id或窗口名称 |

相关快捷键

|     |     || --- | --- ||     | Ctrl+a c :创建窗口 ||     | Ctrl+a w :窗口列表 ||     |     ||     | Ctrl+a n :下一个窗口 ||     | Ctrl+ap :上一个窗口 ||     |     ||     | Ctrl+a0-9 :在第0个窗口和第9个窗口之间切换 ||     |     ||     | Ctrl+a K(大写) :关闭当前窗口,并且切换到下一个窗口 ||     | (当退出最后一个窗口时,该终端自动终止,并且退回到原始shell状态) ||     |     ||     | exit :关闭当前窗口,并且切换到下一个窗口 ||     | (当退出最后一个窗口时,该终端自动终止,并且退回到原始shell状态) ||     |     ||     | Ctrl+a d :退出当前终端,返回加载screen前的shell命令状态 |

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  1. CONNECT:[ UseTime:0.000544s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000801s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000277s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000476s ]
  8. SELECT * FROM `article` WHERE `id` = 482243 LIMIT 1 [ RunTime:0.001552s ]
  9. UPDATE `article` SET `lasttime` = 1774594456 WHERE `id` = 482243 [ RunTime:0.001435s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 482243 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000490s ]
  12. SELECT * FROM `article` WHERE `id` > 482243 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000418s ]
  13. SELECT * FROM `article` WHERE `id` < 482243 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003668s ]
  14. SELECT * FROM `article` WHERE `id` < 482243 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005479s ]
  15. SELECT * FROM `article` WHERE `id` < 482243 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009467s ]
0.089659s