Static IP settings in Ubuntu Core

script.txt

% echo "unit b\nprint" | parted pc.img
WARNING: You are not superuser.  Watch out for permissions.
GNU Parted 3.2
Using /home/chihchun/workspace/canonical/snappy/sampleimage/pc.img
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit b                                                           
(parted) print                                                            
Model:  (file)
Disk /home/chihchun/workspace/canonical/snappy/sampleimage/pc.img: 4294967296B
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start      End         Size        File system  Name        Flags
 1      1048576B   2097151B    1048576B                 BIOS Boot   bios_grub
 2      2097152B   54525951B   52428800B   fat32        EFI System  boot, esp
 3      54525952B  785576447B  731050496B  ext4         writable
% sudo mount -o loop,offset=54525952 pc.img /mnt
% sudo mkdir -p /mnt/system-data/etc/netplan
% sudo tee /mnt/system-data/etc/netplan/00-snapd-config.yaml <<EOF
network:
  version: 2
  ethernets:
    eth0:
      addresses: [192.168.0.1/24]
      nameservers:
        addresses: [1.1.1.1]
    eth1:
      addresses: []
      dhcp4: true
EOF
% sudo umount /mnt