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153 lines
5.0 KiB
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153 lines
5.0 KiB
Markdown
Basics Of NetworkManager Command Line Tool, Nmcli
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### Introduction ###
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In this tutorial, we will discuss NetworkManager command line tool, aka **nmcli**, in CentOS / RHEL 7. Users who are using **ifconfig** should avoid this command in Centos 7.
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Lets configure some networking settings with nmcli utility.
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#### To get all address information of all interfaces connected with System ####
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[root@localhost ~]# ip addr show
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**Sample Output:**
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1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
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link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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inet 127.0.0.1/8 scope host lo
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valid_lft forever preferred_lft forever
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inet6 ::1/128 scope host
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valid_lft forever preferred_lft forever
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2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
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link/ether 00:0c:29:67:2f:4c brd ff:ff:ff:ff:ff:ff
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inet 192.168.1.51/24 brd 192.168.1.255 scope global eno16777736
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valid_lft forever preferred_lft forever
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inet6 fe80::20c:29ff:fe67:2f4c/64 scope link
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valid_lft forever preferred_lft forever
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#### To retrieve packets statistics related with connected interfaces ####
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[root@localhost ~]# ip -s link show eno16777736
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**Sample Output:**
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#### Get routing configuration ####
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[root@localhost ~]# ip route
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Sample Output:
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default via 192.168.1.1 dev eno16777736 proto static metric 100
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192.168.1.0/24 dev eno16777736 proto kernel scope link src 192.168.1.51 metric 100
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#### Analyze path for some host/website ####
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[root@localhost ~]# tracepath unixmen.com
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Output will be just like traceroute but in more managed form.
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### nmcli utility ###
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**Nmcli** is a very rich and flexible command line utility. some of the terms used in nmcli are:
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- **Device** – A network interface being used.
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- **Connection** – A set of configuration settings, for a single device you can have multiple connections, you can switch between connections.
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#### Find out how many connections are available for how many devices ####
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[root@localhost ~]# nmcli connection show
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#### Get details of a specific connection ####
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[root@localhost ~]# nmcli connection show eno1
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**Sample output:**
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#### Get the Network device status ####
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[root@localhost ~]# nmcli device status
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----------
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DEVICE TYPE STATE CONNECTION
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eno16777736 ethernet connected eno1
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lo loopback unmanaged --
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#### Create a new connection with “dhcp” ####
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[root@localhost ~]# nmcli connection add con-name "dhcp" type ethernet ifname eno16777736
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Where,
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- **Connection add** – To add new connection
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- **con-name** – connection name
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- **type** – type of device
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- **ifname** – interface name
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This command will add connection with dhcp protocol.
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**Sample output:**
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Connection 'dhcp' (163a6822-cd50-4d23-bb42-8b774aeab9cb) successfully added.
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#### Instead of assigning an IP via dhcp, you can add ip address as “static” ####
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[root@localhost ~]# nmcli connection add con-name "static" ifname eno16777736 autoconnect no type ethernet ip4 192.168.1.240 gw4 192.168.1.1
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**Sample Output:**
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Connection 'static' (8e69d847-03d7-47c7-8623-bb112f5cc842) successfully added.
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**Update connection:**
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[root@localhost ~]# nmcli connection up eno1
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Again Check, whether ip address is changed or not.
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[root@localhost ~]# ip addr show
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#### Add DNS settings to Static connections. ####
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[root@localhost ~]# nmcli connection modify "static" ipv4.dns 202.131.124.4
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#### Add additional DNS value. ####
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[root@localhost ~]# nmcli connection modify "static" +ipv4.dns 8.8.8.8
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**Note**: For additional entries **+** symbol will be used and **+ipv4.dns** will be used instead on **ip4.dns**
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Put an additional ip address:
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[root@localhost ~]# nmcli connection modify "static" +ipv4.addresses 192.168.200.1/24
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Refresh settings using command:
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[root@localhost ~]# nmcli connection up eno1
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You will see, setting are effective now.
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That’s it.
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--------------------------------------------------------------------------------
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via: http://www.unixmen.com/basics-networkmanager-command-line-tool-nmcli/
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作者：Rajneesh Upadhyay
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出 |