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How to Manage Network using nmcli Tool in RedHat / CentOS 7.x
================================================================================
A new feature of [**Red Hat Enterprise Linux 7**][1] and **CentOS 7** is that the default networking service is provided by **NetworkManager**, a dynamic network control and configuration daemon that attempts to keep network devices and connections up and active when they are available while still supporting the traditional ifcfg type configuration files. NetworkManager can be used with the following types of connections: Ethernet, VLANs, Bridges, Bonds, Teams, Wi-Fi, mobile broadband (such as cellular 3G), and IP-over-InfiniBand. For these connection types, NetworkManager can configure network aliases, IP addresses, static routes, DNS information, and VPN connections, as well as many connection-specific parameters.
The NetworkManager can be controlled with the command-line tool, **nmcli**.
### General nmcli usage ###
The general syntax for nmcli is:
# nmcli [ OPTIONS ] OBJECT { COMMAND | help }
One cool thing is that you can use the TAB key to complete actions when you write the command so if at any time you forget the syntax you can just press TAB to see a list of available options.
![nmcli tab](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-tab.jpg)
Some examples of general nmcli usage:
# nmcli general status
Will display the overall status of NetworkManager.
# nmcli connection show
Will display all connections.
# nmcli connection show -a
Will display only the active connections.
# nmcli device status
Will display a list of devices recognized by NetworkManager and their current state.
![nmcli general](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-gneral.jpg)
### Starting / stopping network interfaces ###
You can use the nmcli tool to start or stop network interfaces from the command line, this is the equivalent of up/down in ifconfig.
To stop an interface use the following syntax:
# nmcli device disconnect eno16777736
To start it you can use this syntax:
# nmcli device connect eno16777736
### Adding an ethernet connection with static IP ###
To add a new ethernet connection with a static IP address you can use the following command:
# nmcli connection add type ethernet con-name NAME_OF_CONNECTION ifname interface-name ip4 IP_ADDRESS gw4 GW_ADDRESS
replacing the NAME_OF_CONNECTION with the name you wish to apply to the new connection, the IP_ADDRESS with the IP address you wish to use and the GW_ADDRESS with the gateway address you use (if you don't use a gateway you can omit this last part).
# nmcli connection add type ethernet con-name NEW ifname eno16777736 ip4 192.168.1.141 gw4 192.168.1.1
To set the DNS servers for this connection you can use the following command:
# nmcli connection modify NEW ipv4.dns "8.8.8.8 8.8.4.4"
To bring up the new Ethernet connection, issue a command as follows:
# nmcli connection up NEW ifname eno16777736
To view detailed information about the newly configured connection, issue a command as follows:
# nmcli -p connection show NEW
![nmcli add static](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-add-static.jpg)
### Adding a connection that will use DHCP ###
If you wish to add a new connection that will use DHCP to configure the interface IP address, gateway address and dns servers, all you have to do is omit the ip/gw address part of the command and Network Manager will use DHCP to get the configuration details.
For example, to create a DHCP configured connection profile named NEW_DHCP, on device
eno16777736 you can use the following command:
# nmcli connection add type ethernet con-name NEW_DHCP ifname eno16777736
--------------------------------------------------------------------------------
via: http://linoxide.com/linux-command/nmcli-tool-red-hat-centos-7/
作者：[Adrian Dinu][a]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
[a]:http://linoxide.com/author/adriand/
[1]:https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.0_Release_Notes/

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如何在RedHat/CentOS 7.x中使用nmcli管理网络
================================================================================
[**Red Hat Enterprise Linux 7**][1]和**CentOS 7**的一个新特性是默认的网络服务由**NetworkManager**提供，这是一个动态的网络控制和配置守护进程，它在网络设备和连接可用时保持链接正常，同时也提供了典型的ifcfg类型的配置文件。NetworkManager可以用于下面这些连接：Ethernet、 VLANs、桥接、Bonds、Teams、 Wi-Fi、 移动宽带 (比如 3G)和IP-over-InfiniBand(IPoIB)。
NetworkManager可以由命令行工具**nmcli**控制。
### nmcli的通常用法 ###
nmcli的通常语法是：
# nmcli [ OPTIONS ] OBJECT { COMMAND | help }
一件很酷的事情是你可以使用tab键来补全操作，这样你在何时忘记了语法你都可以用tab来看到可用的选项了。
![nmcli tab](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-tab.jpg)
nmcli通常用法的一些例子：
# nmcli general status
会显示NetworkManager的整体状态。
# nmcli connection show
会显示所有的连接
# nmcli connection show -a
仅显示活跃的连接
# nmcli device status
显示NetworkManager识别的设备列表和它们当前的状态。
![nmcli general](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-gneral.jpg)
### 启动/停止网络设备 ###
你可以使用nmcli从命令行启动或者停止网络设备，这等同于ifconfig中的up和down。
停止网络设备使用下面的语法：
# nmcli device disconnect eno16777736
要启动它使用下面的语法：
# nmcli device connect eno16777736
### 使用静态IP添加一个以太网连接 ###
要用静态IP添加一个以太网连接可以使用下面的命令：
# nmcli connection add type ethernet con-name NAME_OF_CONNECTION ifname interface-name ip4 IP_ADDRESS gw4 GW_ADDRESS
将NAME_OF_CONNECTION替换成新的连接名，IP_ADDRESS替换成你要的IP地址，GW_ADDRESS替换成你使用的网关地址（如果你并不使用网关，你可以忽略这部分）。
# nmcli connection add type ethernet con-name NEW ifname eno16777736 ip4 192.168.1.141 gw4 192.168.1.1
=要设置这个连接的DNS服务器使用下面的命令：
# nmcli connection modify NEW ipv4.dns "8.8.8.8 8.8.4.4"
要启用新的以太网连接，使用下面的命令：
# nmcli connection up NEW ifname eno16777736
要查看新配置连接的详细信息，使用下面的命令：
# nmcli -p connection show NEW
![nmcli add static](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-add-static.jpg)
### 添加一个使用DHCP的连接 ###
如果你想要添加一个使用DHCP来配置接口IP地址、网关地址和dns服务器地址的新的连接，你要做的就是忽略命令中的ip/gw部分，NetworkManager会自动使用DHCP来获取配置细节。
比如，要创建一个新的叫NEW_DHCP的DHCP连接，在设备eno16777736上你可以使用下面的命令：
# nmcli connection add type ethernet con-name NEW_DHCP ifname eno16777736
--------------------------------------------------------------------------------
via: http://linoxide.com/linux-command/nmcli-tool-red-hat-centos-7/
作者：[Adrian Dinu][a]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
[a]:http://linoxide.com/author/adriand/
[1]:https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.0_Release_Notes/