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- 2021-03-16
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mongo_lag
Name
mongo_lag - MongoDB Replication Lag
Connects to a single mongo instance and retrieve replication lag for all connected members.
Applicable Systems
MongoDB 3.X and 4.X with pymongo installed.
Configuration
Default for host is 127.0.0.1 and port 27017 and will work without being defined:
[mongo_lag]
env.host 127.0.0.1
env.port 27017
env.username user
env.password P@55w0rd
or
[mongo_lag]
env.MONGO_DB_URI mongodb://user:passwd@127.0.0.1:27017
Author
Stefan Andersen stefan@stefanandersen.dk
Updated by Alban Espie-Guillon alban.espie@alterway.fr
License
The Beer Ware License (Revision 42) alban.espie@alterway.fr wrote this file. As long as you retain this notice you can do whatever you want with this stuff. If we meet some day, and you think this stuff is worth it, you can buy me a beer in return.
SPDX-License-Identifier: Beerware
#!/usr/bin/env python3
"""
=head1 NAME
mongo_lag - MongoDB Replication Lag
Connects to a single mongo instance and retrieve replication lag for all connected members.
=head1 APPLICABLE SYSTEMS
MongoDB 3.X and 4.X with pymongo installed.
=head1 CONFIGURATION
Default for host is 127.0.0.1 and port 27017 and will work without being defined:
[mongo_lag]
env.host 127.0.0.1
env.port 27017
env.username user
env.password P@55w0rd
or
[mongo_lag]
env.MONGO_DB_URI mongodb://user:passwd@127.0.0.1:27017
=head1 AUTHOR
Stefan Andersen <stefan@stefanandersen.dk>
Updated by Alban Espie-Guillon <alban.espie@alterway.fr>
=head1 LICENSE
The Beer Ware License (Revision 42)
<alban.espie@alterway.fr> wrote this file. As long
as you retain this notice you can do whatever you want
with this stuff. If we meet some day, and you think
this stuff is worth it, you can buy me a beer in return.
SPDX-License-Identifier: Beerware
=cut
"""
import os
import sys
import pymongo
def _get_members():
if 'MONGO_DB_URI' in os.environ:
conn = pymongo.MongoClient(os.environ['MONGO_DB_URI'])
else:
host = os.environ.get('host', '127.0.0.1')
port = os.environ.get('port', 27017)
username = os.environ.get('username', '')
password = os.environ.get('password', '')
conn = pymongo.MongoClient(host, int(port))
if username:
connAuth = conn['admin']
connAuth.authenticate(username, password)
repl_status = conn.admin.command("replSetGetStatus")
members = {}
for member in repl_status['members']:
if member['stateStr'] != 'ARBITER' :
name = member['name'].split('.')[0]
members[name] = {'state': member['state'], 'optimeDate': member['optimeDate']}
return members
def run():
members = _get_members();
for member in members:
if members[member]['state'] == 1:
primary_optime = members[member]['optimeDate']
for member in members:
lag = (primary_optime - members[member]['optimeDate']).seconds
print("{0}.value {1}".format(member, lag))
def config():
print("""graph_title MongoDB replication lag
graph_args --base 1000
graph_vlabel Replication lag (seconds)
graph_category %s
""" % os.getenv('graph_category', 'db'))
for member in _get_members():
print("{0}.label {0}".format(member))
if __name__ == "__main__":
if len(sys.argv) > 1 and sys.argv[1] == "config":
config()
else:
run()