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Linux30天入门计划|Day12:网络配置与SSH远程连接,玩转服务器远程运维

  • 2026-08-21 12:11:43
Linux30天入门计划|Day12:网络配置与SSH远程连接,玩转服务器远程运维

前面11天,我们掌握了命令、权限、用户、日志、定时任务、软件安装、服务管理。

今天 Day12 我们打通Linux网络底层!

所有服务器操作、远程连接、跳板机、免密登录、服务器互通、固定IP

全部基于今天的内容。

不会网络,就不算会运维!

零基础带你搞定:网卡配置、IP修改、DNS设置、SSH原理、免密登录、故障排查。

一、今日学习目标

✅ 看懂Linux网卡、IP、网关、DNS网络结构

✅ 掌握临时/永久修改服务器IP地址

✅ 理解SSH远程连接原理

✅ 实现SSH免密登录(企业运维标配)

✅ 排查远程连接失败、端口不通、掉线问题

二、查看服务器网络信息(必学命令)

1、查看网卡与IP地址

bash  

ip addr

核心识别:

- lo:本地回环网卡 127.0.0.1

- eth0 / ens33:真实外网/内网网卡

2、查看网关路由

bash  

ip route

记住:default via 后面的IP就是服务器网关

3、测试网络连通性

bash  

ping www.baidu.com

三、手动配置IP、网关、DNS

1、临时修改IP(重启失效)

适合临时调试网络

bash  

ip addr add 192.168.1.100/24 dev ens33

2、永久网卡配置(企业核心)

Ubuntu 修改网卡配置文件:

 /etc/netplan/00-installer-config.yaml 

CentOS 修改网卡配置文件:

 /etc/sysconfig/network-scripts/ifcfg-eth0 

3、常用DNS服务器

plaintext  

阿里云DNS:223.5.5.5

腾讯DNS:119.29.29.29

公共DNS:8.8.8.8

4、重启网络服务

bash  

# Ubuntu

netplan apply

# CentOS

systemctl restart network

四、SSH远程连接原理

SSH 是 Linux 安全远程协议,默认端口 22

替代了老旧、不安全的Telnet明文传输。

两大核心优势:

1. 全程加密,防抓包、防窃听

2. 支持密码登录 + 密钥免密登录

五、SSH基础操作

1、远程连接服务器

bash  

ssh 用户名@IP

# 示例

ssh root@192.168.1.100

2、指定端口连接(企业修改22端口必备)

bash  

ssh -p 2222 root@192.168.1.100

3、退出服务器

bash  

exit

六、企业最重要技能:SSH免密登录

运维每天必用!批量部署、自动化、跳板机全部依赖免密。

1、本机生成密钥(一路回车)

bash  

ssh-keygen

2、将公钥发送到目标服务器

bash  

ssh-copy-id 用户名@服务器IP

3、实现效果

以后连接服务器无需输入密码,直接登录!

免密原理通俗解释

- 本机:生成 私钥(钥匙)+公钥(锁)

- 服务器:存放你的公钥

- 钥匙对得上 → 自动登录

七、文件上传与下载(scp命令)

不用FTP、不用软件,Linux原生传输文件!

1、本地上传文件到服务器

bash  

scp 本地文件 用户名@IP:/服务器路径

scp test.txt root@192.168.1.100:/home

2、服务器文件下载到本地

bash  

scp root@192.168.1.100:/home/test.txt ./

八、常见网络故障排查(工作高频)

1. ping不通外网 → 检查DNS、网关配置

2. 能pingIP不能ping域名 → DNS故障

3. SSH连接超时 → 防火墙、端口不通

4. 密码正确登录失败 → 检查ssh配置、是否禁止root登录

九、今日实操作业(必敲)

bash  

# 1. 查看网卡IP

ip addr

# 2. 查看网关

ip route

# 3. 测试网络

ping www.baidu.com

# 4. 生成密钥

ssh-keygen

# 5. 免密发送公钥

ssh-copy-id root@本机IP

# 6. 测试免密登录

ssh root@本机IP

十、今日总结

1. ip addr 查看网卡IP,ip route 查看网关

2. 服务器网络三要素:IP、网关、DNS

3. SSH默认22端口,加密安全远程连接

4. ssh-keygen + ssh-copy-id 实现企业免密登录

5. scp 实现跨服务器文件传输

6. 掌握网络排查能力,解决90%服务器连接问题

✅ 至此,你已经完全具备专业Linux运维上岗基础能力!

一起学习,一起成长,加关注不迷路

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  1. CONNECT:[ UseTime:0.001001s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001545s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000696s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000609s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001227s ]
  6. SELECT * FROM `set` [ RunTime:0.000506s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001471s ]
  8. SELECT * FROM `article` WHERE `id` = 507863 LIMIT 1 [ RunTime:0.003669s ]
  9. UPDATE `article` SET `lasttime` = 1787324032 WHERE `id` = 507863 [ RunTime:0.025772s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000687s ]
  11. SELECT * FROM `article` WHERE `id` < 507863 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001385s ]
  12. SELECT * FROM `article` WHERE `id` > 507863 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.026308s ]
  13. SELECT * FROM `article` WHERE `id` < 507863 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.034927s ]
  14. SELECT * FROM `article` WHERE `id` < 507863 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002404s ]
  15. SELECT * FROM `article` WHERE `id` < 507863 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.109984s ]
0.379949s