Linux之系统进程及其管理

本是古典何须时尚 2022-04-22 15:36 192阅读 0赞

### 1.显示进程 ###

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>ps ax</td> 
   <td>显示当前系统中的所有进程</td> 
  </tr> 
 </tbody> 
</table>

*如下所示*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70]

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>pstree</td> 
   <td>显示当前系统的进程树</td> 
  </tr> 
 </tbody> 
</table>

*如下所示*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 1]

--------------------

### 2.显示进程指定信息 ###

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>ps -o comm</td> 
   <td>进程名称</td> 
  </tr> 
  <tr> 
   <td>ps -o user</td> 
   <td>进程所有人</td> 
  </tr> 
  <tr> 
   <td>ps -o group</td> 
   <td>进程所有组</td> 
  </tr> 
  <tr> 
   <td>ps -o %cpu</td> 
   <td>进程cpu使用率</td> 
  </tr> 
  <tr> 
   <td>ps -o %mem</td> 
   <td>进程内存使用率</td> 
  </tr> 
  <tr> 
   <td>ps -o pid</td> 
   <td>进程id</td> 
  </tr> 
  <tr> 
   <td>ps -o nice</td> 
   <td>进程优先级</td> 
  </tr> 
 </tbody> 
</table>

#### 进程名称 ####

![在这里插入图片描述][20190115213817801.png]

#### 进程所有人 ####

![在这里插入图片描述][20190115213916707.png]

#### 进程所有组 ####

![在这里插入图片描述][2019011521411854.png]

#### 进程CPU使用率 ####

![在这里插入图片描述][20190115214253618.png]

#### 进程内存使用率 ####

![在这里插入图片描述][20190115214259608.png]

#### 进程ID ####

![在这里插入图片描述][20190115214317353.png]

#### 进程优先级 ####

![在这里插入图片描述][20190115214336575.png]

--------------------

### 3.系统进程排序 ###

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td><strong>ps ax --sort=</strong> <strong>+%cpu</strong>/<strong>-%cpu</strong></td> 
   <td>+由小到大，-由大到小;按CPU占用排序</td> 
  </tr> 
  <tr> 
   <td><strong>ps ax --sort=</strong> <strong>+%mem</strong>/<strong>-%mem</strong></td> 
   <td>+由小到大，-由大到小；按内存占用排序</td> 
  </tr> 
 </tbody> 
</table>

*按CPU占用由高到低排序*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 2]

*按CPU占用由低到高排序*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 3]

*按内存占用由高到低排序*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 4]

*按内存占用由低到高排序*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 5]

**stat中显示的信息**

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>S</td> 
   <td>进程状态</td> 
  </tr> 
  <tr> 
   <td>l</td> 
   <td>内存中有锁存空间</td> 
  </tr> 
  <tr> 
   <td>N</td> 
   <td>优先级低</td> 
  </tr> 
  <tr> 
   <td>&lt;</td> 
   <td>优先级高</td> 
  </tr> 
 </tbody> 
</table>

*如下所示*

![在这里插入图片描述][20190115221123133.png]

--------------------

### 4.进程优先级 ###

#### 进程的优先级范围 ####

**-20～19**

#### 优先级查看 ####

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>ps ax -o pid,nice,comm</td> 
   <td>查看优先级</td> 
  </tr> 
 </tbody> 
</table>

*如下所示*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 6]

#### 指定某个优先级开启进程 ####

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>nice -n 优先级数字 进程名称</td> 
   <td>开启某个进程并指定优先级为</td> 
  </tr> 
  <tr> 
   <td>nice -n 5 vim &amp;</td> 
   <td>开启vim并且指定程序优先级为-5</td> 
  </tr> 
 </tbody> 
</table>

*注意：加&为了使打开的软件不占用终端*

*如下所示*

![在这里插入图片描述][20190115221933990.png]

#### 改变进程优先级 ####

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>renice -n 优先级数字 进程pid</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td>renice -n -5 2685</td> 
   <td>改变2685进程的优先级为-5</td> 
  </tr> 
 </tbody> 
</table>

[root@localhost ~]# renice -n -5 2685
    =====================================
    2685 (process ID) old priority 5, new priority -5
    [root@localhost ~]# ps a -o pid,nice,comm
    =========================================
      PID  NI COMMAND
      591   0 Xorg
     1183   0 agetty
     1594   0 bash
     2685  -5 vim
     2751  -5 vim
     2808   0 ps

*重新指定前*

![在这里插入图片描述][20190115223816855.png]

*指定后*

![在这里插入图片描述][20190115223924948.png]

--------------------

### 5.环境中进程的前后台调用 ###

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>jobs</td> 
   <td>查看被打入环境后台的进程</td> 
  </tr> 
  <tr> 
   <td>ctrl+z</td> 
   <td>把占用终端的进程打入后台</td> 
  </tr> 
  <tr> 
   <td>fg jobsnum</td> 
   <td>把后台进程调回前台</td> 
  </tr> 
  <tr> 
   <td>bg jobsnum</td> 
   <td>把后台暂停的进程运行</td> 
  </tr> 
  <tr> 
   <td>comm &amp;</td> 
   <td>让命令直接在后台运行</td> 
  </tr> 
 </tbody> 
</table>

--------------------

### 6.进程信号 ###

#### 常用信号等级 ####

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1</td> 
   <td>进程重新加载配置</td> 
  </tr> 
  <tr> 
   <td>2</td> 
   <td>删除进程在内存中的数据</td> 
  </tr> 
  <tr> 
   <td>3</td> 
   <td>删除鼠标在内存中的数据</td> 
  </tr> 
  <tr> 
   <td>9</td> 
   <td>强行关闭单个进程（不可能阻塞）</td> 
  </tr> 
  <tr> 
   <td>15</td> 
   <td>正常关闭进程（可能会阻塞）</td> 
  </tr> 
  <tr> 
   <td>18</td> 
   <td>运行暂停的进程</td> 
  </tr> 
  <tr> 
   <td>19</td> 
   <td>暂停某个进程（不能被阻塞）</td> 
  </tr> 
  <tr> 
   <td>20</td> 
   <td>把进程打入后台（可以被阻塞）</td> 
  </tr> 
 </tbody> 
</table>

man 7 signal	##查看信号详细信息
    kill	-信号	进程pid
    killall	-信号	进程名字
    pkill	-u xiaoma -信号

*man 7 signal*

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 7]

--------------------

### 7.进程的动态监控 ###

#### top ####

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1.</td> 
   <td>显示cpu每个核的负载</td> 
  </tr> 
  <tr> 
   <td>s</td> 
   <td>调整刷新频率</td> 
  </tr> 
  <tr> 
   <td>c</td> 
   <td>CPU负载排序</td> 
  </tr> 
  <tr> 
   <td>m</td> 
   <td>内存使用量排序</td> 
  </tr> 
  <tr> 
   <td>h</td> 
   <td>查看帮助</td> 
  </tr> 
  <tr> 
   <td>u</td> 
   <td>查看指定用户进程</td> 
  </tr> 
  <tr> 
   <td>k</td> 
   <td>对指定进程发起信号</td> 
  </tr> 
  <tr> 
   <td>q</td> 
   <td>退出</td> 
  </tr> 
 </tbody> 
</table>

##### top调用监控 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 8]

##### 显示CPU每个核的负载 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 9]

##### 调整刷新频率 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 10]

##### CPU负载排序 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 11]

##### 内存使用量排序 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 12]

##### 查看帮助 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 13]

##### 查看用户指定进程 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 14]

##### 对指定进程发起信号 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 15]

##### 退出 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 16]

--------------------

### 8.控制服务 ###

#### 什么是服务 ####

cs模型  
c表示client  
s表示server  
vnc为例  
c-TigerVNC  
s-VNCserver

定义：系统中运行的对于系统本身没有意义，但是对客户主机有重大意义的程序叫做服务性软件简称服务。

#### 用什么控制服务 ####

系统初始化进程可以对服务进行相应的控制

#### 当前系统初始化进程是什么 ####

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>systemd</td> 
   <td>系统初始化进程</td> 
  </tr> 
  <tr> 
   <td>pstree</td> 
   <td>显示系统中的进程树</td> 
  </tr> 
 </tbody> 
</table>

#### 进程控制命令 ####

ssh------>sshd
    client	 server
     进程	  进程指向的服务

<table> 
 <thead> 
  <tr> 
   <th>命令</th> 
   <th>用法</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>systemctl status sshd</td> 
   <td>查看服务状态，inactive（不可用），active（可用）</td> 
  </tr> 
  <tr> 
   <td>systemctl start sshd</td> 
   <td>开启服务</td> 
  </tr> 
  <tr> 
   <td>systemctl stop sshd</td> 
   <td>关闭服务</td> 
  </tr> 
  <tr> 
   <td>systemctl restart sshd</td> 
   <td>重启服务</td> 
  </tr> 
  <tr> 
   <td>systemctl reload sshd</td> 
   <td>重新加载服务配置</td> 
  </tr> 
  <tr> 
   <td>systemctl enable sshd</td> 
   <td>设定服务开机启动</td> 
  </tr> 
  <tr> 
   <td>systemctl disable sshd</td> 
   <td>设定服务开机不启动</td> 
  </tr> 
  <tr> 
   <td>systemctl list-units sshd</td> 
   <td>列出已经开启服务当前状态</td> 
  </tr> 
  <tr> 
   <td>systemctl list-units-files</td> 
   <td>列出所有服务开机启动的状态 disabled，enable，static</td> 
  </tr> 
  <tr> 
   <td>systemctl set-default multi-user.target</td> 
   <td>设定系统启动级别为多用户模式（无图形）</td> 
  </tr> 
  <tr> 
   <td>systemctl set-default graphical.target</td> 
   <td>设定系统启动级别为图形模式</td> 
  </tr> 
 </tbody> 
</table>

##### 查看服务状态 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 17]

##### 开启服务 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 18]

##### 关闭服务 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 19]

##### 设定服务开机启动 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 20]

##### 设定服务开机不启动 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 21]

##### 列出已经开启服务当前状态 #####

![在这里插入图片描述][20190116100324641.png]

##### 列出所有服务开机启动的状态 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 22]

关于Linux系统进程以及它的管理操作就是这些。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70]: /images/20220327/8603ded1c1424c70bfb79bbab270421d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 1]: /images/20220327/cdd06b80ff8b417f898fd41f5eb8d0e4.png
[20190115213817801.png]: /images/20220327/c9355907acd343f79857b2c420781a66.png
[20190115213916707.png]: /images/20220327/fbefe5497a844cf4bbefea178097df8a.png
[2019011521411854.png]: /images/20220327/8d019631596f4bb0b809ce8adb5c4360.png
[20190115214253618.png]: /images/20220327/826e668699764a89bd586b5c445881ed.png
[20190115214259608.png]: /images/20220327/f52158190c8b4f15851dada4eef58018.png
[20190115214317353.png]: /images/20220327/8bfcd171f69c4b09ae3b1a84cc875179.png
[20190115214336575.png]: /images/20220327/d2d2a9c6fe8d48d69aca1582a9886b71.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 2]: /images/20220327/d9e780002b52412b862ae42852a58f76.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 3]: /images/20220327/af023abe41a14d83be9ce4d3c3195abf.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 4]: /images/20220327/639cbd0eb87b46d0b939f86f9b7680b7.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTcwMzY5_size_16_color_FFFFFF_t_70 5]: /images/20220327/705e800531b64347ad96f2dae9b6f6ee.png
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