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Since Ubuntu 16.04 LTS network configuration is done using netplan [1], and source code is available in GitHub since July 20106: https://github.com/CanonicalLtd/netplan/releases/tag/0.1.

Depending on your Bionic (18.04LTS) installation method, your configuration file will be different:[2] 

INSTALL TYPE	RENDERER	FILE
Server ISO	systemd-networkd	/etc/netplan/01-netcfg.yaml
Cloud Image	systemd-networkd	/etc/netplan/50-cloud-init.yaml
Desktop ISO	NetworkManager	/etc/netplan/01-network-manager-all.yaml

Basic Commands

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  • netplan try (you can also verity your YAML file before trying it, for example using yq utility)
  • netplan generate to validate the configuration is correctly parsed by netplan and written to disk so next boot will be available.
  • netplan --debug apply[3]
  • netplan apply

Config Files

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Activities

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Basic

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  1. Read Netplan examples: https://netplan.io/examples
  2. Configure your DNS servers in Ubuntu. https://www.techrepublic.com/article/how-to-set-dns-nameservers-in-ubuntu-server-18-04/

Advanced

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  1. Review netplan source code: https://github.com/CanonicalLtd/netplan

See also

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  1. ↑ https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes#Network_configuration
  2. ↑ https://ubuntu.com/blog/ubuntu-bionic-netplan
  3. ↑ https://www.techrepublic.com/article/how-to-set-dns-nameservers-in-ubuntu-server-18-04/
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