Linode

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Installing the linode CLI:

pip3 install linode-cli
linode-cli configure --token
linode-cli --json --pretty domains list

Example Perl code using LWP to update an A record:

# Set up a user agent with our token as default header
$ua = LWP::UserAgent->new();
$ua->default_header(
	'Content-Type'  => "application/json",
	'Authorization' => "Bearer $dnsApiKey"
);

# Find the ID of the domain
$json = $ua->get( 'https://api.linode.com/v4/domains' )->content;
for ( @{ decode_json( $json )->{data} } ) {
	$domain_id = $_->{id} if $_->{domain} eq $domain;
}
die "Domain name not found" unless $domain_id;

# Find the ID of the A record having the host name
$json = $ua->get( "https://api.linode.com/v4/domains/$domain_id/records" )->content;
for ( @{ decode_json( $json )->{data} } ) {
	$record_id = $_->{id} if $_->{name} eq $host;
}
die "Host name not found" unless $record_id;

# Update the A record
$ua->put(
	"https://api.linode.com/v4/domains/$domain_id/records/$record_id",
	'Content' => encode_json({ 'target' => $new_IP })
);