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How do I configure network settings--like identity, IPv4 format (address, netmask, gateway, DNS), security and passwords--in Ubuntu 18.04 through a script?

I couldn't find any gsettings schemas for it. I'd very much appreciate if someone can point me in the right direction.

Eliah Kagan
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frankenstein
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    Hi.. you want to create a new one or edit the existing one? – PRATAP-PANABAKA Oct 22 '19 at 05:31
  • There are command line tools available for network manager. If you are still using network manager would you like to continue using? – mchid Oct 22 '19 at 05:50
  • @PRATAP , firstly add a new profile and later edit it with updates. – frankenstein Oct 22 '19 at 07:29
  • @mchid yes, I'll prefer to continue using the same network manager default with ubuntu 18.04.. but again it's just a preference, if there are better ways to work around it, I'm open to em.. – frankenstein Oct 22 '19 at 07:30
  • @PRATAP , create a new script, if thats what you meant. – frankenstein Oct 22 '19 at 08:29
  • @frankenstein Thanks, the answer is below. If you don't already know, you can list available wireless and ethernet devices by running ifconfig. These examples use enp1s0 for the ethernet device and wlp2s0 for wifi. – mchid Oct 22 '19 at 08:43

1 Answers1

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You can use the nmcli tool to edit connections through NetworkManager.

For example, say you want to create an ethernet connection for device: enp1s0.

  • IP: 192.168.1.10

  • gateway: 192.168.1.1

  • DNS: 8.8.8.8

  • connection name: "net-enp1s0" 

sudo nmcli con add con-name "net-enp1s0" ifname enp1s0 type ethernet ipv4.method manual ip4 192.168.1.10/24 gw4 192.168.1.1 ipv4.dns 8.8.8.8

or as a script (you will need to use sudo to run this script):

#!/bin/bash
nmcli con add \
con-name "net-enp1s0" \
ifname enp1s0 \
type ethernet \
ipv4.method manual \
ip4 192.168.1.10/24 \
gw4 192.168.1.1 \
ipv4.dns 8.8.8.8

These are the options:

  • con = connection

  • add = add

  • con-name "net-enp1s0" = connection id

  • ifname enp1s0 = connection interface-name

  • type ethernet = connection type

  • ipv4.method manual = use static IP

  • ip4 192.168.1.10/24 = local ipv4 address and netmask (24=255.255.255.0)

  • gw4 192.168.1.1 = gateway

  • ipv4.dns 8.8.8.8 = DNS server

You can also edit an existing connection.

Configuration file for our "net-enp1s0" connection is: /etc/NetworkManager/system-connections/net-enp1s0. The file should look like this:

[connection]
id=net-enp1s0
uuid=5099a1ae-1ae0-42d7-acf8-178ef3772f4f
type=ethernet
interface-name=enp1s0
permissions=

[ethernet]
mac-address-blacklist=

[ipv4]
address1=192.168.1.10/24,192.168.1.1
dns=8.8.8.8;
dns-search=
method=manual

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto

If you edit the configuration file for a network, you can run the following command to apply the changes:

sudo nmcli con reload

The following example is for a WPA wireless connection with PSK named "coffee-shop" on a network named "freewifi" using the password "freepassword":

sudo nmcli con add con-name "coffee-shop" type wifi ifname wlp2s0 ssid "freewifi" -- wifi-sec.key-mgmt wpa-psk wifi-sec.psk "freepassword" ipv4.method manual ip4 192.168.1.10/24 gw4 192.168.1.1 ipv4.dns 8.8.8.8

Here it is as a script:

#!/bin/bash
nmcli con add \
con-name "coffee-shop" \
type wifi \
ifname wlp2s0 \
ssid "freewifi" \
-- wifi-sec.key-mgmt wpa-psk \
wifi-sec.psk "freepassword" \
ipv4.method manual \
ip4 192.168.1.10/24 \
gw4 192.168.1.1 \
ipv4.dns 8.8.8.8

Links:

Also, this Arch Linux wiki page has a list of nmcli examples.

The CertDepot tutorial is for RedHat but pretty much all of the nmcli stuff applies to Ubuntu. However, Ubuntu configuration files are in /etc/NetworkManager/system-connections and you can directly edit these files.

mchid
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