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rabbitmq-cluster.py
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rabbitmq-cluster.py
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#!/usr/bin/env python
import logging
import os
import subprocess
import time
import socket
import requests
LOGGER = logging.getLogger(__name__)
APP_ID = os.getenv('MARATHON_APP_ID')
MESOS_TASK_ID = os.getenv('MESOS_TASK_ID')
MARATHON_URI = os.environ.get('MARATHON_URI', 'http://marathon.mesos:8080')
HOST_IP = os.getenv('HOST', '127.0.0.1')
HOST_NAME = os.getenv('HOSTNAME') # docker container_id
def get_marathon_app(app_id):
response = requests.get('%s/v2/apps%s' % (MARATHON_URI, app_id))
state = response.json()
return state['app']
def get_marathon_tasks(app_id):
response = requests.get('%s/v2/apps%s/tasks' % (MARATHON_URI, app_id))
state = response.json()
return state['tasks']
def get_node_ips():
my_ip = ''
other_ips = []
if MARATHON_URI:
LOGGER.info('Discovering configuration from %s for app %s', MARATHON_URI, APP_ID)
tasks = get_marathon_tasks(APP_ID)
LOGGER.info('Found %d tasks for %s', len(tasks), APP_ID)
for task in tasks:
if task['startedAt']:
node_ip = task['host']
# for private ips like in calico network, use ip per task
# see https://mesosphere.github.io/marathon/docs/ip-per-task.html
if 'ipAddresses' in task:
if len(task['ipAddresses']) > 0:
node_ip = task['ipAddresses'][0]['ipAddress']
LOGGER.info('Task ip is %s, slave ip is %s', node_ip, task['host'])
LOGGER.info('Found started task %s at %s', task['id'], node_ip)
if task['id'] == MESOS_TASK_ID:
my_ip = node_ip
LOGGER.info('My own ip/hostname is %s', my_ip)
else:
other_ips.append(node_ip)
return my_ip, other_ips
def wait_for_nodes_to_start():
while True:
current_app = get_marathon_app(APP_ID)
configured_count = current_app['instances']
running_count = current_app['tasksRunning']
if running_count == configured_count:
break
LOGGER.info('%s is configured to have %d tasks,'
' there are %d running tasks now,'
' waiting for one minute...',
APP_ID, configured_count, running_count)
time.sleep(60)
LOGGER.info('%s has %d running tasks now', APP_ID, running_count)
def is_ip(ip):
try:
socket.inet_aton(ip)
return True
except socket.eror:
return False
def get_node_name(node_ip):
node_name = node_ip
if is_ip(node_ip):
node_name = node_ip.replace('.', '-')
return node_name
def configure_name_resolving(current_node_ip, other_node_ips=None):
LOGGER.info('Adding extra entries to /etc/hosts...')
current_node_hostname = get_node_name(current_node_ip)
with open('/etc/hosts', 'a') as f:
LOGGER.info('Adding current node entries...')
host_name_entry = '127.0.0.1 %s' % HOST_NAME
f.write(host_name_entry + '\n')
LOGGER.info('+' + host_name_entry)
current_host_entry = '127.0.0.1 %s' % current_node_hostname
f.write(current_host_entry + '\n')
LOGGER.info('+' + current_host_entry)
if other_node_ips:
LOGGER.info('Adding other node entries...')
for node_ip in other_node_ips:
if node_ip != current_node_ip:
if not is_ip(node_ip):
# if mesos slaves using hostname instead of ip
# no need to add anything to /etc/hosts
# docker container is expected to resolve
# mesos-slave hostnames already.
LOGGER.info('Skipping %s, not an ip', node_ip)
continue
node_hostname = get_node_name(node_ip)
node_host_entry = '%s %s' % (node_ip, node_hostname)
f.write(node_host_entry + '\n')
LOGGER.info('+' + node_host_entry)
LOGGER.info('Changing hostname as %s...', current_node_hostname)
os.putenv('HOSTNAME', current_node_hostname)
return current_node_hostname
def set_erlang_cookie():
cookie_file = '/var/lib/rabbitmq/.erlang.cookie'
rabbitmq_erlang_cookie = os.getenv('RABBITMQ_ERLANG_COOKIE', None)
existing_rabbitmq_erlang_cookie = None
cookie_file_exists = os.path.isfile(cookie_file)
if cookie_file_exists:
LOGGER.info('Found %s', cookie_file)
with open(cookie_file, 'r') as f:
existing_rabbitmq_erlang_cookie = f.read().strip()
LOGGER.info('Existing erlang cookie is %s', existing_rabbitmq_erlang_cookie)
if not rabbitmq_erlang_cookie and not existing_rabbitmq_erlang_cookie:
raise RuntimeError('No erlang cookie is set!')
if existing_rabbitmq_erlang_cookie\
and existing_rabbitmq_erlang_cookie != rabbitmq_erlang_cookie:
LOGGER.warn('%s file contents [%s] do not match RABBITMQ_ERLANG_COOKIE [%s],'
' keeping existing one.',
cookie_file, existing_rabbitmq_erlang_cookie, rabbitmq_erlang_cookie)
if not existing_rabbitmq_erlang_cookie:
LOGGER.info('Creating erlang cookie file with secret "%s"', rabbitmq_erlang_cookie)
with open(cookie_file, 'w') as f:
f.write(rabbitmq_erlang_cookie)
subprocess.call(['chown', 'rabbitmq', cookie_file])
subprocess.call(['chmod', '600', cookie_file])
def create_rabbitmq_config_file(node_ips=None):
rabbitmq_config_file = '/etc/rabbitmq/rabbitmq.config'
LOGGER.info('Creating %s', rabbitmq_config_file)
default_user = os.getenv('RABBITMQ_DEFAULT_USER', 'guest')
default_pass = os.getenv('RABBITMQ_DEFAULT_PASS', 'guest')
default_vhost = os.getenv('RABBITMQ_DEFAULT_VHOST', '/')
net_ticktime = os.getenv('RABBITMQ_NET_TICKTIME', '60')
cluster_partition_handling = os.getenv('RABBITMQ_CLUSTER_PARTITION_HANDLING', 'ignore')
rabbitmq_management_port = os.getenv('RABBITMQ_MANAGEMENT_PORT', '/')
vm_mem_hw_absolute = os.getenv('RABBITMQ_VM_MEM_HW_ABSOLUTE', '0')
if vm_mem_hw_absolute == '0':
vm_mem_hw_absolute = None
with open(rabbitmq_config_file, 'w') as f:
f.write('[\n')
f.write(' {kernel, [{net_ticktime, %s}]},\n' % net_ticktime)
f.write(' {rabbit,\n')
f.write(' [\n')
f.write(' {loopback_users, []},\n')
f.write(' {heartbeat, 580},\n')
f.write(' {default_user, <<"%s">>},\n' % default_user)
f.write(' {default_pass, <<"%s">>},\n' % default_pass)
f.write(' {default_vhost, <<"%s">>},\n' % default_vhost)
f.write(' {cluster_partition_handling, %s},\n' % cluster_partition_handling)
f.write(' {cluster_nodes, {[\n')
if vm_mem_hw_absolute:
f.write(' {vm_memory_high_watermark, {absolute, "%s"}}\n' % vm_mem_hw_absolute)
if node_ips:
nodes_str = ','.join(["'rabbit@%s'" % get_node_name(n)
for n in node_ips])
f.write(' %s\n' % nodes_str)
f.write(' ], disc}}\n')
f.write(' ]\n')
f.write(' },\n')
f.write(' {rabbitmq_management, [{listener, [{port, %s}]}]}\n'
% rabbitmq_management_port)
f.write('].\n')
def configure_rabbitmq(current_node_hostname, node_ips):
with open('/etc/rabbitmq/rabbitmq-env.conf', 'a') as f:
f.write('NODENAME=rabbit@%s\n' % current_node_hostname)
# other settings are already in environment like port settings, see Dockerfile
subprocess.call(['chown', '-R', 'rabbitmq', '/var/lib/rabbitmq'])
set_erlang_cookie()
create_rabbitmq_config_file(node_ips)
def run():
wait_for_nodes_to_start()
my_ip, other_ips = get_node_ips()
current_node_hostname = configure_name_resolving(my_ip, other_ips)
configure_rabbitmq(current_node_hostname, other_ips)
subprocess.call(['rabbitmq-server'])
if __name__ == '__main__':
logging.basicConfig(
level=logging.INFO,
format='%(asctime)s [%(levelname)s] %(message)s'
)
run()