Linux

目录

• 用户管理
• 查看端口情况

用户管理

新增

adduser kgl
Adding user `kgl' ...
Adding new group `kgl' (1001) ...
Adding new user `kgl' (1001) with group `kgl' ...
Creating home directory `/home/kgl' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: <== 输入密码
Retype new UNIX password: <== 确认密码 
passwd: password updated successfully
Changing the user information for kgl
Enter the new value, or press ENTER for the default
    Full Name []: <== 回车
    Room Number []: <== 回车
    Work Phone []: <== 回车
    Home Phone []: <== 回车
    Other []: <== 回车
Is the information correct? [Y/n] y

添加sudo权限

usermod -aG sudo kgl

密钥登录

• 生成密钥对

ssh-keygen<== 生成
Generating public/private rsa key pair.
Enter file in which to save the key (/home/kgl/.ssh/id_rsa): <== 回车
Created directory '/home/kgl/.ssh'.
Enter passphrase (empty for no passphrase): <== 回车
Enter same passphrase again: <== 回车
Your identification has been saved in /home/kgl/.ssh/id_rsa.
Your public key has been saved in /home/kgl/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:xd2DSlXACa1YI2rqEz2HyqlGHLFY9UKFW7qdxtDavkA kgl@iZwz92qfb6ao9koavdyhcfZ
The key's randomart image is:

• 配置公钥到服务器

sudo vi authorized_keys<== 在.ssh文件夹下生成authorized_keys文件，并把id_rsa.pub的内容复制进去
sudo: unable to resolve host iZwz92qfb6ao9koavdyhcfZ
[sudo] password for kgl: <== 输入登录密码

• 使用私钥登录
  1. 将id_rsa下载到本地

  2. 将私钥导入客户端（这里用的是Xshell），就能够登录了

     
     

查看端口情况

查看某个端口是否被占用

lsof -i:端口号
COMMAND     PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 21024 root    4u  IPv6  72930      0t0  TCP *:mysql (LISTEN)