CentOS 8 常用操作
网络配置
nmcli命令
1、显示当前网卡信息
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| [root@centos8-1 network-scripts]# nmcli connection
NAME UUID TYPE DEVICE
Wired connection 1 d05ff1cb-7c01-3651-9cfd-01ee4b118bc8 ethernet eth1
eth0 10edd6e5-1de5-4dc3-8058-1ece613acc56 ethernet eth0
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2、创建两个不同网络环境的配置文件
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| # 这种方法虽然说指定了IP地址 但是实际是不生效的
[root@centos8-1 network-scripts]# nmcli connection add con-name eth0-09 ifname eth0 type ethernet ipv4.addresses 172.20.7.80/24
Connection 'eth0-09' (7f8b7a58-5ba1-4774-9b69-143707792d30) successfully added.
[root@centos8-1 network-scripts]# nmcli connection
NAME UUID TYPE DEVICE
eth0 10edd6e5-1de5-4dc3-8058-1ece613acc56 ethernet eth0
eth0-09 7f8b7a58-5ba1-4774-9b69-143707792d30 ethernet --
# 查看网卡配置文件，其中看到BOOTPROTO=dhcp
[root@centos8-1 network-scripts]# cat ifcfg-eth0-09
BOOTPROTO=dhcp
# 修改网卡配置不让它自动获取IP
[root@centos8-1 network-scripts]# nmcli connection modify eth0-09 ipv4.method manual
[root@centos8-1 network-scripts]# cat ifcfg-eth0-09
BOOTPROTO=none
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3、网卡创建好之后查看详细信息
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| [root@centos8-1 network-scripts]# nmcli connection show eth0-office
connection.id: eth0-office
connection.uuid: 08589320-088c-45b3-9f63-878285a1d24f
connection.stable-id: --
connection.type: 802-3-ethernet
connection.interface-name: eth0
connection.autoconnect: yes
connection.autoconnect-priority: 0
connection.autoconnect-retries: -1 (default)
connection.multi-connect: 0 (default)
connection.auth-retries: -1
connection.timestamp: 0
connection.read-only: no
connection.permissions: --
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4、新创建好的网卡是没有被启用的需要手动启用
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| [root@centos8-1 network-scripts]# nmcli connection up eth0-09
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然后生效后当前终端是断了，通过虚拟机的控制端通过ip a 可以看到IP已经变了，然后再使用nmcli connection 可以看到新创建的eth0-09已经挂在到eth0上了
5、修改已经创建好的网卡名称
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| [root@centos8-1 ~]# nmcli connection modify eth0-office con-name eth0-test
[root@centos8-1 ~]# nmcli connection
NAME UUID TYPE DEVICE
Wired connection 1 d05ff1cb-7c01-3651-9cfd-01ee4b118bc8 ethernet eth1
eth0 10edd6e5-1de5-4dc3-8058-1ece613acc56 ethernet eth0
eth0-09 7f8b7a58-5ba1-4774-9b69-143707792d30 ethernet --
eth0-test 08589320-088c-45b3-9f63-878285a1d24f ethernet --
# 这里要注意，修改的是eth0-office里面的NAME名称，/etc/sysconfig/network-scripts/
# 目录下的名称不变
[root@centos8-1 network-scripts]# ls
ifcfg-eth0 ifcfg-eth0-09 ifcfg-eth0-office
[root@centos8-1 network-scripts]# cat ifcfg-eth0-office
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eth0-test
UUID=08589320-088c-45b3-9f63-878285a1d24f
DEVICE=eth0
ONBOOT=yes
# 修改网卡配置文件中的ONBOOT为no
[root@centos8-1 ~]#nmcli connection modify eth0-09 connection.autoconnect no
[root@centos8-1 ~]#nmcli connection reload
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