Ubuntu20.04 网络配置

Ubuntu20.04 网络配置 Ubuntu20.04 网络配置 设置 ROOT 密码

• 先设置 root 密码，后面直接使用 root 用户 *** 作

it@it:~$ sudo passwd root

[sudo] password for it:

New password:

Retype new password:

passwd: password updated successfully

网络管理工具 netplan

1. 在 Ubuntu20.04 版本中使用 netplan 管理网络
2. 在安装好的 Ubuntu20.04 中没有 networking 和 NetworkManage 服务
3. netplan 配置文件：/etc/netplan/*.yaml ，文件名每个不一样
4. netplan 示例文件: /usr/share/doc/netplan/example/ 目录下，在该目录下有各种示例文件，可以提供帮助

修改网卡配置

1. 编辑网络配置文件

root@it:~# vim /etc/netplan/00-installer-config.yaml

# This is the network config written by 'subiquity'

network:

  ethernets:

    ens32:

      addresses:

      - 192.168.121.25/24

      gateway4: 192.168.121.2

      nameservers:

        addresses:

        - 8.8.8.8

  version: 2

1. 加载刚刚修改的配置文件信息

root@it:~# netplan apply

root@it:~#

• 没有提示报错信息，说明配置成功

root@it:~# ip add

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000

    link/ether 00:0c:29:16:8d:18 brd ff:ff:ff:ff:ff:ff

    inet 192.168.121.25/24 brd 192.168.121.255 scope global ens32

       valid_lft forever preferred_lft forever

    inet6 fe80::20c:29ff:fe16:8d18/64 scope link

       valid_lft forever preferred_lft forever

netplan 帮助信息

root@it:~# netplan help

usage: /usr/sbin/netplan  [-h] [--debug]  ...

Network configuration in YAML        #YAML中的网络配置

optional arguments:

  -h, --help  show this help message and exit        #显示此帮助信息并退出

  --debug     Enable debug messages        #启用调试消息

Available commands:

    help      Show this help message        #显示帮助信息

    apply     Apply current netplan config to running system         #应用当前netplan配置到运行系统

    generate  Generate backend specific configuration files from /etc/netplan/*.yaml       #从/etc/netplan/*.yaml中生成特定后端配置文件

    info      Show current netplan version and available features       #显示当前netplan版本和可用特性

    ip        Retrieve IP information from the system        #从系统中检索IP信息

    try       Try to apply a new netplan config to running system, with automatic rollback        #尝试将新的netplan配置应用到正在运行的系统，并自动回滚

1. 启用调试信息

root@it:~# netplan --debug apply

** (generate:3189): DEBUG: 01:15:27.908: Processing input file /etc/netplan/00-installer-config.yaml..

** (generate:3189): DEBUG: 01:15:27.908: starting new processing pass

** (generate:3189): DEBUG: 01:15:27.908: We have some netdefs, pass them through a final round of validation

** (generate:3189): DEBUG: 01:15:27.908: ens32: setting default backend to 1

** (generate:3189): DEBUG: 01:15:27.908: Configuration is valid

** (generate:3189): DEBUG: 01:15:27.908: Generating output files..

** (generate:3189): DEBUG: 01:15:27.908: NetworkManager: definition ens32 is not for us (backend 1)

(generate:3189): GLib-DEBUG: 01:15:27.908: posix_spawn avoided (fd close requested)

DEBUG:netplan generated networkd configuration changed, restarting networkd

DEBUG:no netplan generated NM configuration exists

DEBUG:ens32 not found in {}

DEBUG:Merged config:

network:

  bonds: {}

  bridges: {}

  ethernets:

    ens32:

      addresses:

      - 192.168.121.25/24

      gateway4: 192.168.121.2

      nameservers:

        addresses:

        - 8.8.8.8

  vlans: {}

  wifis: {}

DEBUG:Skipping non-physical interface: lo

DEBUG:device ens32 operstate is up, not changing

DEBUG:{}

DEBUG:netplan triggering .link rules for lo

DEBUG:netplan triggering .link rules for ens32