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This article focuses on "how to use the nmcli command to manage the network in the Linux of the RedHat department". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use the nmcli command to manage the network in the Linux of the RedHat department.

The default network service in Red Hat Enterprise Linux 7 and CentOS 7 is provided by NetworkManager, which is a daemon that dynamically controls and configures the network. It is used to keep current network devices and connections working, while also supporting traditional ifcfg type configuration files.

NetworkManager can be used for the following types of connections: Ethernet,VLANS,Bridges,Bonds,Teams,Wi-Fi,mobile boradband (such as Mobile 3G) and IP-over-InfiniBand. For these network types, NetworkManager can configure their network aliases, IP addresses, static routes, DNS,VPN connections, and many other special parameters.

You can use the command line tool nmcli to control NetworkManager.

Nmcli usage

The code is as follows:

# nmcli [OPTIONS] OBJECT {COMMAND | help}

We can complete the command with the TAB key, and when you forget the syntax of this command, just press TAB to see the list of options.

Some examples of using nmcli:

The code is as follows:

# nmcli general status

This command prints out all the states of the NetworkManager.

The code is as follows:

# nmcli connection show

Show all connections.

The code is as follows:

# nmcli connection show-a

Only currently active connections are displayed.

The code is as follows:

# nmcli device status

List the devices identified by NetworkManager and their status.

Start / stop the network interface

Using the nmcli tool to start or stop the network interface is the same as ifconfig's up/down.

Use the following command to stop an interface:

The code is as follows:

# nmcli device disconnect eno16777736

The following command is used to start the interface:

The code is as follows:

# nmcli device connect eno16777736

Add Ethernet connection to static IP

The following command adds an Ethernet connection to a static IP address:

The code is as follows:

# nmcli connection add type ethernet con-name NAME_OF_CONNECTION ifname interface-name ip4 IP_ADDRESS gw4 GW_ADDRESS

Change the NAME_OF_CONNECTION,IP_ADDRESS and GW_ADDRESS parameters according to the configuration you need (omit the last part if you don't need a gateway).

The code is as follows:

# nmcli connection add type ethernet con-name NEW ifname eno16777736 ip4 192.168.1.141 gw4 192.168.1.1

Use the following command to set up the DNS server:

The code is as follows:

# nmcli connection modify NEW ipv4.dns "8.8.8.8 8.8.4.4"

The following command starts a new Ethernet connection:

The code is as follows:

# nmcli connection up NEW ifname eno16777736

View the configuration information for the new connection:

The code is as follows:

# nmcli-p connection show NEW

Add a new connection using DHCP

Add new connections and use DHCP to automatically assign IP addresses, gateways, DNS, etc. All you have to do is remove the ip/gw address after the command line, and DHCP will automatically assign these parameters.

For example, configure a DHCP connection named NEW_DHCP on an eno 16777736 device

The code is as follows:

# nmcli connection add type ethernet con-name NEW_DHCP ifname eno16777736

At this point, I believe you have a deeper understanding of "how to use nmcli commands in RedHat Linux to manage the network". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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