Process management, service management, remote

1. What is a process

Process is what the system is doing

2. Process status

Run

Dormancy

Stop it

Go on

End

Zombie Process

3. How to view processes in a drawing

Gnome-system-monitor

4. How to view processes with commands

PS Process Viewing tool

-a process running in shell

-X does not process the shell re-run

-U View Process user

-L Display Process details

-F Full info abbreviation

-e Displays all processes in the system

Ps-aux |grep Process keyword

PS Ax-o%cpu,%mem,user,pid,comm # #查看进程某项信息

PS aux--sort +|-%cpu|%mem ... # #进程按指定方式排序

5. How to control the front and back calls of the shell heavy process

Command & # #进程在shell后台运行

CTRL +z # #把占用shell的进程打入后台停止

Jobs # #查看被打入后台的进程信息

FG Job Number # #把指定进程调回前台

BG Job number # #运行后台停止进程

CTRL +c # #关闭占用shell进程

6. How to control processes with commands

1) Signal

Signal 1 # #reload进程

Signal 2 # #ctrl +c Delete the information in memory of the process

Signal 3 # #内存中的鼠标信息清除

Signal 9 # #强行关闭进程

Signal # #正常关闭进程

Signal # #开启停止的进程

Signal # #停止正在运行的进程

Signal # #ctrl +z

2) Signal Initiation

Kill Signal PID

Killall Signal Process Name

Pkill-u Username # #结束某个用户的所有进程

7. User Login Monitoring

W # #查看当前使用系统的用户

W-f # #查看当前使用系统的用户并显示使用地点

Last # #查看登陆过系统的用户

LASTB # #查看试图登陆但没有成功的用户

8.top command

U username

K Signal

H

S

M

C

1. What is a service?

Service

Service is the software running in the system, this software is mainly to provide a function, then we call this kind of software service

2. Service Management, Systemctl command

Systemctl Start Service Name # # #开启服务

Stop .... # # #关闭服务

Restart .... # # #重启服务

Reload .... # # #重新加在服务配置

Status .... # # #查看服务状态

Enable .... # # #设定服务开机启动

Disable .... # # #禁止服务开机启动

List-dependencies # # #查看服务依赖关系

List-units # # #查看当前运行的所有服务

List-unit-files # # #查看服务的开机启动情况

Set-defaultmulti-user.target # # #开机不启动图形

Set-defaultgraphical.target # # #开机启动图形

1. What is OpenSSH

is a software that provides remote access control

2. How to implement remote access

SSH remote host user @ remote host IP address

SSH [email protected]

The authenticity of host ' 172.25.254.1 (172.25.254.1) ' can ' t be established.

ECDSA key fingerprint is 55:dd:43:ce:bf:94:dd:91:49:e7:97:29:63:3d:02:02.

Is you sure want to continue connecting (yes/no)? Yes # #建立安全传输key

[email protected] ' s password: # #密码输入没有回显

Last failed Login:sun Oct one 16:56:29 CST from172.25.254.206 on Ssh:notty

There was 1 failed login attempt since the lastsuccessful login.

Last Login:sun Oct 16:55:46 from172.25.254.206

[Email protected] ~]# # # #登陆成功

CTRL +d |logout # # #退出

[Email protected] ~]# Logout

Connection to 172.25.254.1 closed.

[Email protected] ~]# VIM/ETC/MOTD # # #设定登陆显示字符

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Process management, service management, remote