Some snippits for rapidly configuring Linode nameserver records

linode-dns-autoconfig.py

#!/usr/bin/env python3

import json, subprocess as sp
import yaml

config = yaml.load(open("config.yml"))
ipv4 = config['ipv4']
ipv6 = config['ipv6']
soa_email = config['soa_email']
domain_type = config['domain_type']

ErrorFindingDomainName = Exception('Error finding domain name!')

def linode(*args):
    cmd = ['linode-cli', '--suppress-warnings', '--json']  + list(args)
    print('CMD: ' + ' '.join(cmd))
    spc = sp.run(cmd,  stderr=sp.STDOUT, stdout=sp.PIPE, text=True)
    out = spc.stdout.strip()
    # Remove the garbage 'Request failed: [blah]' line
    # that we get sometimes before the actual json
    if '\n' in out:
        out = out.split('\n')[1]
    if out:
        print('JSON string: %s' % out)
        return json.loads(out)
    else:
        return None

def findDomainInfoByName(domain_name):
    for entry in linode('domains', 'list'):
        if entry['domain'] == domain_name:
            return entry
    raise ErrorFindingDomainName

def configureAllExistingDomains():
    domain_info = getDomainInfo()
    for entry in domain_info:
        configureDomain(entry['id'], entry['domain'])

def configureDomain(domain_id, domain_name):
    domain_id = str(domain_id)
    for ip in (ipv4, ipv6):
        linode('domains', 'records-create', domain_id, '--type', 'A', '--target', ip)
        linode('domains', 'records-create', domain_id, '--type', 'A', '--target', ip, '--name', 'mail')
        linode('domains', 'records-create', domain_id, '--type', 'A', '--target', ip, '--name', 'www')

    linode('domains', 'records-create', domain_id, '--type', 'MX', '--target', 'mail.' + domain_name, '--priority', '10')

def deleteDomainByName(domain_name):
    print('Deleting %s...' % domain_name)
    domain_id = str(findDomainInfoByName(domain_name)['id'])
    linode('domains', 'delete', domain_id)

def createDomain(domain_name):
    print('Attempting to create %s...' % domain_name)
    domain_info = linode('domains', 'create', '--domain', domain_name, '--type', domain_type, '--soa_email', soa_email)
    # in event that domain name already exists, our output json will look like:
    # [{'field': 'domain', 'reason': 'DNS zone already exists.'}]
    if 'reason' in domain_info[0].keys():
        if domain_info[0]['reason'] == 'DNS zone already exists.':
            print('Error! Domain already exists. Deleting and then recreating domain...')
            deleteDomainByName(domain_name)
            # Now we just recursively try again
            return createDomain(domain_name)
    else:
        return domain_info

def initDomains(domain_name_list):
    for domain_name in domain_name_list:
        domain_info = createDomain(domain_name)
        configureDomain(str(domain_info[0]['id']), domain_info[0]['domain'])

domains = open('domains.list').read().split()
initDomains(domains)