linux系统中nmcli命令、查看、添加、删除、编辑⽹络会话
⽹络会话：通俗讲就是不同的⽹络模式模板，nmcli命令可以实现不同模板间的快速切换。
1、如何查看系统中已有的⽹络会话
[root@pc2 network-scripts]# nmcli connection show ## 可见有⼀个⽹络会话
NAME UUID TYPE DEVICE
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
[root@pc2 network-scripts]# nmcli con show
NAME UUID TYPE DEVICE
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
## 以上⽹络会话的名称为eno16777728
## 以上两条命令中的connection 和 con 实现的功能是⼀样的
## 后经过测试以上两条命令等价于nmcli connetion 和 nmcli con，也就是说省略show
2、如何增加⽹络会话
[root@pc2 network-scripts]# nmcli con show ## ⾸先查看当前的⽹络会话
NAME UUID TYPE DEVICE
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
[root@pc2 network-scripts]# nmcli con add con-name net1 ifname eno16777728 type ethernet autoconnect yes ## 增加⼀个⽹络会话，eno16777728为当前系统的⽹卡，可以使⽤ifconfig命令查看## add表⽰添加； con-name指定增加的⽹络会话名称； ifname指定使⽤⽹卡的名称； type指定⽹络类型，这⾥指定为以太⽹； autoconnect yes指定是否⾃动连接，这⾥选择是
Connection 'net1' (378492e9-990e-4cd7-b189-40a9e13c3beb) successfully added.
[root@pc2 network-scripts]# nmcli con show ## 再次列出所有的⽹络会话，已经增加了名称为net1的⽹络会话
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet --
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
再添加⼀个⽹络会话，设定不⾃动连接，⼿动指定IP地址，⼿动指定⽹关
[root@pc2 network-scripts]# nmcli con show ## 查看系统中所有的⽹络会话
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet --
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
[root@pc2 network-scripts]# nmcli con add con-name net2 ifname eno16777728 type ethernet autoconnect no ip4 192.168.5.10/24 gw4 192.168.5.1
Connection 'net2' (da1ee70d-69c3-4243-a3d3-55f990e4d5b2) successfully added.
## 以上增加⽹络会话的命令中设置了不⾃动连接，⼿动指定了IP地址，⼿动指定⽹关
[root@pc2 network-scripts]# nmcli con show ## 查看系统中所有的⽹络会话，已经增加了名称为net2的⽹络会话
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet --
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
net2 da1ee70d-69c3-4243-a3d3-55f990e4d5b2 802-3-ethernet --
3、如何切换⽹络会话
[root@pc2 network-scripts]# nmcli con show ## ⾸先列出系统中已有的⽹络会话，⼀共三个⽹络会话
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet --
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet eno16777728
net2 da1ee70d-69c3-4243-a3d3-55f990e4d5b2 802-3-ethernet --
[root@pc2 network-scripts]# ifconfig | head -n 3 ## 查看系统当前的IP地址
eno16777728: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.20 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::20c:29ff:feaa:2b29 prefixlen 64 scopeid 0x20<link>
[root@pc2 network-scripts]# nmcli con up net1 ## 切换⾄net1⽹络会话
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/23)
[root@pc2 network-scripts]# ifconfig | head -n 3 ## 查看此时的IP地址已经改变，net1设定为⾃动连接
eno16777728: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.61.136 netmask 255.255.255.0 broadcast 192.168.61.255
inet6 fe80::20c:29ff:feaa:2b29 prefixlen 64 scopeid 0x20<link>
[root@pc2 network-scripts]# nmcli con up net2 ## 再次切换⾄net2⽹络会话
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/24)
[root@pc2 network-scripts]# ifconfig | head -n 3 ## 查看此时的IP地址也已经改变，net2为⼿动设定
eno16777728: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.5.10 netmask 255.255.255.0 broadcast 192.168.5.255
inet6 fe80::20c:29ff:feaa:2b29 prefixlen 64 scopeid 0x20<link>
4、如何查询当前使⽤的哪⼀个⽹络会话
[root@pc2 network-scripts]# nmcli con up net2 ## ⾸次使⽤命令切换到net2⽹络会话
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/25)
[root@pc2 network-scripts]# nmcli device status ## 查看此时的⽹络会话，已经为net2
DEVICE TYPE STATE CONNECTION
eno16777728 ethernet connected net2
lo loopback unmanaged --
[root@pc2 network-scripts]# nmcli con up net1 ## 切换到net1⽹络会话
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/26)
[root@pc2 network-scripts]# nmcli device status ## 查看此时的⽹络会话，已经为net1
DEVICE TYPE STATE CONNECTION
eno16777728 ethernet connected net1
lo loopback unmanaged --
5、如何删除⽹络会话
[root@pc2 network-scripts]# nmcli con show ## ⾸先列出系统中所有的⽹络会话
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet eno16777728
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet --
net2 da1ee70d-69c3-4243-a3d3-55f990e4d5b2 802-3-ethernet --
[root@pc2 network-scripts]# nmcli con add con-name net3 ifname eno16777728 type ethernet autoconnect no ip4 192.168.7.10/24 gw4 192.168.7.1 ## 上⾯的命令增加⼀个测试的⽹络会话net3，⼿动指定IP地址和⽹关
Connection 'net3' (8c80ac7f-abb7-48c4-a978-c1fc4d3d4926) successfully added.
[root@pc2 network-scripts]# nmcli con show ## 查看当前所有的⽹络会话，已经有了net3
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet eno16777728
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet --
net3 8c80ac7f-abb7-48c4-a978-c1fc4d3d4926 802-3-ethernet --
net2 da1ee70d-69c3-4243-a3d3-55f990e4d5b2 802-3-ethernet --
[root@pc2 network-scripts]# nmcli con delete net3 ## 删除⽹络会话net3
[root@pc2 network-scripts]# nmcli con show ## 查看当前所有的⽹络会话，已经没有net3
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet eno16777728
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet --
net2 da1ee70d-69c3-4243-a3d3-55f990e4d5b2 802-3-ethernet --
6、如何查看⽹络会话的详细信息
[root@pc2 network-scripts]# nmcli con show ## 列出系统中所有的⽹络会话，注意UUID列
NAME UUID TYPE DEVICE
net1 378492e9-990e-4cd7-b189-40a9e13c3beb 802-3-ethernet eno16777728
eno16777728 22ca4bf3-febe-4fc8-9091-2817e2cd6f66 802-3-ethernet --
net2 da1ee70d-69c3-4243-a3d3-55f990e4d5b2 802-3-ethernet --
[root@pc2 network-scripts]# nmcli con show net1 | wc -l ## 统计net1⽹络会话详细信息的⾏数
91
[root@pc2 network-scripts]# nmcli con show net1 | head -n 3 ## 查看net1前三⾏
connection.id: net1
connection.uuid: 378492e9-990e-4cd7-b189-40a9e13c3beb
connection.interface-name: eno16777728
[root@pc2 network-scripts]# nmcli con show net2 | wc -l
47
[root@pc2 network-scripts]# nmcli con show net2 | head -n 3
connection.id: net2
connection.uuid: da1ee70d-69c3-4243-a3d3-55f990e4d5b2
connection.interface-name: eno16777728
[root@pc2 network-scripts]# nmcli con show net2 | head -n 30 ## net2⽹络会话前⽂中设定的⼿动指定IP地址、⽹关，可以在下⾯看到connection.id: net2
connection.uuid: da1ee70d-69c3-4243-a3d3-55f990e4d5b2
connection.interface-name: eno16777728
connection.autoconnect: no
connection.timestamp: 1604556127
connection.permissions:
<: --
connection.master: --
connection.slave-type: --
connection.secondaries:
connection.gateway-ping-timeout: 0
linux系统地址802-3-ethernet.port: --
802-3-ethernet.speed: 0
802-3-ethernet.duplex: --
802-3-ethernet.auto-negotiate: yes
802-3-ethernet.mac-address: --
802-3-ethernet.cloned-mac-address: --
802-3-ethernet.mac-address-blacklist:
802-3-ethernet.s390-subchannels:
802-3-ethernet.s390-nettype: --
802-3-ethernet.s390-options:
ipv4.dns:
ipv4.dns-search:
ipv4.addresses: { ip = 192.168.5.10/24, gw = 192.168.5.1 }
ipv4.ignore-auto-routes: no
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