k-space/bind-sidecar
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Add replica support
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This commit is contained in:
Lauri Võsandi 2022-09-24 08:43:25 +03:00
parent 061916c1d5
commit e13ef93836
1 changed files with 27 additions and 19 deletions
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34
bind-sidecar.py
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@ -1,13 +1,19 @@
#!/usr/bin/env python3
import argparse
import asyncio
import ecs_logging
import logging
import os
import sys
import signal
import socket
from kubernetes_asyncio.client.api_client import ApiClient
from kubernetes_asyncio import client, config, watch
from time import time
parser = argparse.ArgumentParser()
parser.add_argument("--replica", action="store_true")
args = parser.parse_args()
# Get the Logger
logger = logging.getLogger()
logger.setLevel(logging.INFO)
@ -17,14 +23,6 @@ handler = logging.StreamHandler()
handler.setFormatter(ecs_logging.StdlibFormatter())
logger.addHandler(handler)
ZONEFILE_TEMPLATE = """
@ IN SOA ns1.%(zone)s. hostmaster.%(zone)s. (2022060820 300 300 300 300)
NS ns1.%(zone)s.
ns1 A %(ip)s
"""
_, ip = sys.argv
PATH_CONFIG = "/var/bind/bind.conf"
PATH_ZONEFILE = "/var/bind/db.%s"
@ -32,11 +30,21 @@ active_zones = set()
def update_config():
master = socket.gethostbyname("bind-primary")
with open(PATH_CONFIG + ".part", "w") as fh:
for zone in active_zones:
path = PATH_ZONEFILE % zone
if args.replica:
fh.write("zone \"%s\" { type slave; masters { %s key zone-transfer; }; };\n" % (zone, master))
else:
fh.write("zone \"%s\" { type master; file \"%s\"; };\n" % (zone, path))
os.rename(PATH_CONFIG + ".part", PATH_CONFIG)
logger.debug("File %s updated", PATH_CONFIG)
try:
with open("/var/bind/named.pid") as fh:
os.kill(int(fh.read()), signal.SIGHUP)
except FileNotFoundError:
logger.warn("File /var/bind/named.pid not found, assuming Bind not running yet")
async def update_loop(v1, apps_api, api_instance, revision):
@ -50,14 +58,14 @@ async def update_loop(v1, apps_api, api_instance, revision):
if event["type"] == "ADDED":
zone = event["object"]["metadata"]["name"]
active_zones.add(zone)
if not args.replica:
path = PATH_ZONEFILE % zone
logger.info("Adding zone: %s", zone)
if not os.path.exists(path):
with open(path + ".part", "w") as fh:
fh.write(ZONEFILE_TEMPLATE % {
"ip": ip,
"zone": zone
})
fh.write("@ IN SOA ns1.%(zone)s. hostmaster.%(zone)s. (1 300 300 300 300)\n" % locals())
fh.write(" NS ns1.%(zone)s.\n" % locals())
fh.write("ns1 A 127.0.0.1\n")
os.rename(path + ".part", path)
update_config()
elif event["type"] == "DELETED":