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1.19 Linux进程管理-2

  • 2026-03-27 09:16:18
1.19 Linux进程管理-2

2、uptime查看系统负载-top动态管理进程

2.1 uptime 查看系统负载

[root@localhost ~]# uptime  16:12:37 up  5:35,  2 users,  load average: 0.00, 0.01, 0.05 16:12:37 up          5:35,             2 users,            load average: 0.00, 0.01, 0.05 系统时间              启动后运行时间  用户登录个数   平均队列长度(平均负载):1min、5min、15min

2.2 top 动态管理进程

top - 16:15:10 up  5:38,  2 users,  load average: 0.00, 0.01, 0.05Tasks: 119 total,   1 running, 118 sleeping,   0 stopped,   0 zombie#  进程总数  正在运行进程数 睡眠的进程数  停止的进程数  僵尸进程数%Cpu(s):  0.0 us,  0.1 sy,  0.0 ni, 99.9 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 stKiB Mem :   995924 total,   495296 free,   107040 used,   393588 buff/cache    #物理空间使用情况 总 空闲 已用 缓存/缓冲KiB Swap:   307196 total,   307196 free,        0 used.   689064 avail Mem     #虚拟空间使用情况 总 空闲 已用    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                      17393 root      20   0  162004   2236   1564 R   0.3  0.2   0:00.01 top                                                              1 root      20   0  193556   6516   4136 S   0.0  0.7   0:01.92 systemd                                                          2 root      20   0       0      0      0 S   0.0  0.0   0:00.01 kthreadd                                                   
%CPU  us  系统用户所占百分比  sy  内核所占百分比  ni  改变过优先级进程所占百分比  id  空闲CPU百分比  wa  等待I/O完成的时间总量  hi  硬中断所占百分比  si  软中断所占百分比  st  (steal)偷:虚拟机偷物理内存所占百分比      物理机运行KVM、XEM虚拟机,KVM虚拟机占用物理机所占百分比PR   内核所调整的优先级(用户不能修改)NI   用户所调整的优先级(用户能修改)VIRT  ps中的VSZ,申请的内存RES   ps中的RSS,实际使用的内存SHR   共享内存大小(kb)(函数库)s   进程状态%CPU  CPU所占百分比%MEM  物理空间所占百分比TIME+  进程使用CPU的时间总计(单位 1/100秒)CMD   执行的命令
top快捷键
  默认3s刷新一次,s修改刷新时间  空格  立即刷新  q    退出  P    按CPU排序  M    按物理内存排序  T    按时间排序      top  -p  PID   #指定PID查看进程      top  -u  用户  #指定用户查看进程      top  U  用户  #指定用户查看进程 数字1  显示每个内核CPU使用率

注意:CPU总占用可超过100%,需要结合CPU数量来计算

2.3 lsof

$ lsof  # 查看进程和目录的关系,将文件和进程联系 lsof  [选项]  -p   PID   #指定PID查看  -i   :端口   #指定端口查看练习: 终端1:  vim  yq.txt 终端2:  ps  aux | grep  yq.txt |grep -v grep   #找到yq.txt的PID
[root@localhost ~]# ps aux |grep yq.txt|grep -v greproot      17520  0.1  0.5 151568  5100 pts/0    S+   16:43   0:00 vim yq.txt  
## 通过上诉PID查看[root@localhost ~]# lsof -p 17520COMMAND   PID USER   FD   TYPE DEVICE  SIZE/OFF     NODE NAMEvim     17520 root  cwd    DIR    8,3       184 33574977 /rootvim     17520 root  rtd    DIR    8,3       224       64 /vim     17520 root  txt    REG    8,3   2294208 50771387 /usr/bin/vimvim     17520 root  mem    REG    8,3     61624   249276 /usr/lib64/libnss_files-2.17.sovim     17520 root  mem    REG    8,3 106075056   258004 /usr/lib/locale/locale-archive   
## 查看22端口[root@localhost ~]# lsof -i :22COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAMEsshd     6434 root    3u  IPv4  35246      0t0  TCP *:ssh (LISTEN)sshd     6434 root    4u  IPv6  35257      0t0  TCP *:ssh (LISTEN)sshd     6702 root    3u  IPv4  36587      0t0  TCP localhost.localdomain:ssh->192.168.18.1:10382 (ESTABLISHED)sshd     6769 root    3u  IPv4  37590      0t0  TCP localhost.localdomain:ssh->192.168.18.1:10681 (ESTABLISHED)sshd    17484 root    3u  IPv4  79566      0t0  TCP localhost.localdomain:ssh->192.168.18.1:8799 (ESTABLISHED)sshd    17488  yq1    3u  IPv4  79566      0t0  TCP localhost.localdomain:ssh->192.168.18.1:8799 (ESTABLISHED)

2.4 ss

  • 查看套接字,将套接字与进程联系

  • 套接字文件:存储ip和端口的结合

 ss  [选项]  -a   #显示监听和建立连接的套接字  -t   #输出TCP套接字  -u   #输出UDP套接字  -n   #以端口号显示(默认显示服务名称)  -p   #显示使用套接字的进程
[root@localhost ~]# ss -anptState       Recv-Q Send-Q                           Local Address:Port                                          Peer Address:Port              LISTEN      0      128                                          *:22                                                       *:*                   users:(("sshd",pid=6434,fd=3))LISTEN      0      100                                  127.0.0.1:25                                                       *:*                   users:(("master",pid=6585,fd=13))ESTAB       0      0                               192.168.18.134:22                                            192.168.18.1:10681               users:(("sshd",pid=6769,fd=3))ESTAB       0      0                               192.168.18.134:22                                            192.168.18.1:10382               users:(("sshd",pid=6702,fd=3))ESTAB       0      0                               192.168.18.134:22                                            192.168.18.1:8799                users:(("sshd",pid=17488,fd=3),("sshd",pid=17484,fd=3))LISTEN      0      128                                         :::22                                                      :::*                   users:(("sshd",pid=6434,fd=4))LISTEN      0      100                                        ::1:25                                                      :::*                   users:(("master",pid=6585,fd=14))
注意: fd:文件描述符 内核用于管理已被打开的文件创建索引,用来指向被打开的文件

3  前、后台进程切换、nice进程优先级,screen终端复用工具

3.1前后台进程

 前台进程:命令执行中持续占用前台 后台进程:  命令  &  #将命令执行放入后台 依赖终端:进程的控制终端 后台运行并脱离终端:守护进程(Daemon)   单次将命令放入后台运行,并脱离终端    格式:     nohup  命令  &   练:ping  ip 实现脱离终端放入后台运行
[root@localhost ~]# nohup ping 127.0.0.1 &[1] 18628[root@localhost ~]# nohup: 忽略输入并把输出追加到"nohup.out"

3.2 &

  • 用在命令的最后,可以将命令放到后台执行
ctrl + z  #暂停挂起作业jobs    #查看已经挂起的作业
[root@localhost ~]# jobs[1]+  已停止               vim yq.txt#fg  数字  #继续作业#bg  数字  #后台暂停的作业,继续后台执行

3.3 kill、killall、pkill

1)kill -l #列出所有支持的信号

[root@localhost ~]# kill -l 1) SIGHUP  2) SIGINT  3) SIGQUIT  4) SIGILL  5) SIGTRAP 6) SIGABRT  7) SIGBUS  8) SIGFPE  9) SIGKILL 10) SIGUSR111) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM16) SIGSTKFLT 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ26) SIGVTALRM 27) SIGPROF 28) SIGWINCH 29) SIGIO 30) SIGPWR31) SIGSYS 34) SIGRTMIN 35) SIGRTMIN+1 36) SIGRTMIN+2 37) SIGRTMIN+338) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+843) SIGRTMIN+9 44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+1348) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-1253) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-758) SIGRTMAX-6 59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-263) SIGRTMAX-1 64) SIGRTMAX 

kill -2 pid #sigint信号,键盘终端 ctrl+c

终端1:

[root@localhost ~]# ping 127.0.0.1PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.019 ms64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.023 ms64 bytes from 127.0.0.1: icmp_seq=45 ttl=64 time=0.021 ms--- 127.0.0.1 ping statistics ---45 packets transmitted, 45 received, 0% packet loss, time 44002msrtt min/avg/max/mdev = 0.018/0.026/0.068/0.012 ms

终端2:

[root@localhost ~]# ps aux|grep ping |grep -v greproot      17715  0.0  0.1 128440  1272 pts/0    S+   17:44   0:00 ping 127.0.0.1[root@localhost ~]# kill -2 17715

kill -9 PID #sigkill信号 强制终止

#终端1[root@localhost ~]# ping 127.0.0.1PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.029 ms64 bytes from 127.0.0.1: icmp_seq=16 ttl=64 time=0.021 ms64 bytes from 127.0.0.1: icmp_seq=17 ttl=64 time=0.022 ms64 bytes from 127.0.0.1: icmp_seq=18 ttl=64 time=0.022 ms64 bytes from 127.0.0.1: icmp_seq=19 ttl=64 time=0.023 ms已杀死#终端2[root@localhost ~]# ps aux |grep ping |grep -v greproot      17859  0.0  0.1 128440  1272 pts/0    S+   17:54   0:00 ping 127.0.0.1[root@localhost ~]# kill -9 17859

kill -15 PID #sigterm信号 终止(正常结束)缺省信号

#终端1[root@localhost ~]# ping 127.0.0.1PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.022 ms64 bytes from 127.0.0.1: icmp_seq=18 ttl=64 time=0.024 ms64 bytes from 127.0.0.1: icmp_seq=19 ttl=64 time=0.022 ms64 bytes from 127.0.0.1: icmp_seq=20 ttl=64 time=0.023 ms已终止#终端2[root@localhost ~]# ps aux |grep ping |grep -v greproot      17863  0.0  0.1 128440  1268 pts/0    S+   17:55   0:00 ping 127.0.0.1[root@localhost ~]# kill -15 17863

2) killall 名称

killall -i 名称 #交互式逐一确认杀死

[root@localhost ~]# killall -i sshd杀死 sshd(17810) ? (y/N) n杀死 sshd(17811) ? (y/N) n

3) pkill 命令

pkill -9 -t 终端号 #按照终端号踢出用户

#终端1执行踢出命令[root@localhost ~]# pkill -9 -t pts/#终端2执行w查看,并在终端1执行踢出后再查看[root@localhost ~]# w |grep wroot     pts/3    192.168.18.1     17:57    0.00s  0.03s  0.01s w[root@localhost ~]# Connection closed by foreign host.Disconnected from remote host(192.168.18.134:22) at 17:58:20.Type `help' to learn how to use Xshell prompt.[c:\~]$ 

3.4 进程优先级管理

优先级取值范围(-20,19),数值越小,优先级越高,默认优先级是0nice  -n  [+-]数字  命令   #修改命令优先级(未在进程中的命令)
#终端1 修改命令优先级[root@localhost ~]# nice -n 5 vim /root/yq.txt ~                                                                                                                                ~#终端2 查看命令优先级修改效果[root@localhost ~]# ps aux | grep yq.txt |grep -v grep root      17989  0.0  0.5 151568  5252 pts/0    SN+  18:08   0:00 vim /root/yq.txt[root@localhost ~]# top -p 17989top - 18:09:23 up  7:32,  4 users,  load average: 0.00, 0.01, 0.05Tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 stKiB Mem :   995924 total,   476164 free,   113360 used,   406400 buff/cacheKiB Swap:   307196 total,   307196 free,        0 used.   681856 avail Mem    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                     17989 root      25   5  151568   5252   2732 S   0.0  0.5   0:00.02 vim

renice -n [+-]数字 PID #修改PID优先级(正在进程中的PID)

[root@localhost ~]# ps aux |grep yq.txt |grep -v greproot      17989  0.0  0.5 151568  5252 pts/0    SN+  18:08   0:00 vim /root/yq.txt[root@localhost ~]# renice  -n -15 1798917989 (进程 ID) 旧优先级为 5,新优先级为 -15[root@localhost ~]# top -p 17989top - 18:14:57 up  7:37,  4 users,  load average: 0.00, 0.01, 0.05Tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 stKiB Mem :   995924 total,   475968 free,   113360 used,   406596 buff/cacheKiB Swap:   307196 total,   307196 free,        0 used.   681668 avail Mem    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                     17989 root       5 -15  151568   5252   2732 S   0.0  0.5   0:00.02 vim

3.5 screen

终端复用工具,可让bash脱离终端,可用于备份(需要yum安装)

## screen  -S  名称   #创建自定义名称的脱离终端[root@localhost ~]# screen -S yq_out
## screen  -ls     #查看[root@localhost ~]# screen -lsThere is a screen on:        18044.yq_out    (Attached)1 Socket in /var/run/screen/S-root
## screen  -r   名称  #连接脱离终端[root@localhost ~]# screen -r yq_out## exit   #退出当前

练习:使用screen实现后台备份

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  1. CONNECT:[ UseTime:0.000925s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001454s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.019268s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001575s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001439s ]
  6. SELECT * FROM `set` [ RunTime:0.000819s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001526s ]
  8. SELECT * FROM `article` WHERE `id` = 481604 LIMIT 1 [ RunTime:0.009013s ]
  9. UPDATE `article` SET `lasttime` = 1774594456 WHERE `id` = 481604 [ RunTime:0.017482s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000609s ]
  11. SELECT * FROM `article` WHERE `id` < 481604 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001190s ]
  12. SELECT * FROM `article` WHERE `id` > 481604 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001248s ]
  13. SELECT * FROM `article` WHERE `id` < 481604 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011434s ]
  14. SELECT * FROM `article` WHERE `id` < 481604 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005035s ]
  15. SELECT * FROM `article` WHERE `id` < 481604 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002968s ]
0.224804s