kazulog@sv1:~$ for f in /etc/netplan/*.yaml /etc/hosts /etc/nsswitch.conf; do echo "===== $f"; sudo cat "$f" 2>/dev/null; done
===== /etc/netplan/50-cloud-init.yaml
network:
  version: 2
  ethernets:
    ens2:
      addresses:
      - "10.19.12.11/16"
      nameservers:
        addresses:
        - 10.1.0.1
        - 10.1.0.2
      dhcp4: false
      routes:
      - to: "default"
        via: "10.19.0.1"
===== /etc/netplan/60-ens3.yaml
network:
  version: 2
  ethernets:
    ens3:
      dhcp4: false
      dhcp6: true
      accept-ra: true
      addresses:
        - 192.168.100.10/24
      routes:
        - to: default
          via: 192.168.100.1
          metric: 200
      nameservers:
        addresses: [192.168.100.1]
        search: [kazulog.example]
===== /etc/hosts
# Your system has configured 'manage_etc_hosts' as True.
# As a result, if you wish for changes to this file to persist
# then you will need to either
# a.) make changes to the master file in /etc/cloud/templates/hosts.debian.tmpl
# b.) change or remove the value of 'manage_etc_hosts' in
#     /etc/cloud/cloud.cfg or cloud-config from user-data
#
127.0.1.1 ubuntu sv1
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

===== /etc/nsswitch.conf
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd:         files systemd
group:          files systemd
shadow:         files systemd
gshadow:        files systemd

hosts:          files dns
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis