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How to Manage Network using nmcli Tool in RedHat / CentOS 7.x
下回文件名前面的日期不要去掉哦~
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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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在 RedHat/CentOS 7.x 中使用 cmcli 命令管理网络
===============
[**Red Hat Enterprise Linux 7** 与 **CentOS 7**][1] 中默认的网络服务由 **NetworkManager** 提供，这是动态控制及配置网络的守护进程，它用于保持当前网络设备及连接处于工作状态，同时也支持传统的 ifcfg 类型的配置文件。
NetworkManager 可以用于以下类型的连接：
Ethernet，VLANS，Bridges，Bonds，Teams，Wi-Fi，mobile boradband（如移动3G）以及 IP-over-InfiniBand。针对与这些网络类型，NetworkManager 可以配置他们的网络别名，IP 地址，静态路由，DNS，VPN连接以及很多其它的特殊参数。
可以用命令行工具 nmcli 来控制 NetworkManager。
###nmcli 用法###
# nmcli [ OPTIONS ] OBJECT { COMMAND | help }
我们可以通过 TAB 键补全命令，当你忘记这个命令的语法时只需要按下 TAB 就可以看到选项列表。
![nmcli tab](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-tab.jpg)
使用 nmcli 的一些例子：
# nmcli general status
这条命令将 NetworkManager 的所有状态都打印出来。
# nmcli connection show
显示所有连接。
# nmcli connection show -a
仅显示当前活动的连接。
# nmcli device status
列出通过 NetworkManager 验证的设备列表及他们的状态。
![nmcli general](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-gneral.jpg)
### 启动/停止 网络接口###
使用 nmcli 工具启动或停止网络接口，与 ifconfig 的 up/down 是一样的。使用下列命令停止某个接口：
# nmcli device disconnect eno16777736
下列命令用来启动接口：
# nmcli device connect eno16777736
###添加静态IP的以太网连接
以下命令可以添加一个静态IP地址的以太网连接：
# nmcli connection add type ethernet con-name NAME_OF_CONNECTION ifname interface-name ip4 IP_ADDRESS gw4 GW_ADDRESS
根据你需要的配置更改 NAME_OF_CONNECTION,IP_ADDRESS, GW_ADDRESS参数（如果不需要网关的话可以省略最后一部分）。
# nmcli connection add type ethernet con-name NEW ifname eno16777736 ip4 192.168.1.141 gw4 192.168.1.1
使用下列命令设置DNS服务器：
# nmcli connection modify NEW ipv4.dns "8.8.8.8 8.8.4.4"
下列命令启动新的 Ethernet 连接：
# nmcli connection up NEW ifname eno16777736
查看新连接的配置信息：
# nmcli -p connection show NEW
![nmcli add static](http://blog.linoxide.com/wp-content/uploads/2014/12/nmcli-add-static.jpg)
增加新的连接，使用DHCP自动分配IP地址，网关，DNS等，你要做的就是将命令行后 ip/gw 地址部分去掉就行了，DHCP会自动分配这些参数。
例，在 eno 16777736 设备上配置一个 名为 NEW_DHCP 的 DHCP 连接
# 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：[SPccman](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/