py-mongo-sync

An oplog based realtime sync tool written in Python that could sync data from MongoDB to MongoDB and Elasticsearch.

Features

• initial sync and oplog based incremental sync
• sync the specified databases
• sync the specified collections
• sync the sepcified fileds in collections to Elasticsearch
• rename the destination index name for Elasticsearch

Requirements

• gevent

• mmh3

• toml

• pymongo 3.0 or later

  Use pymongo 3.5.1 if your source MongoDB is version 2.4.
  pymongo 3.6 adds support for MongoDB 3.6, drops support for CPython 3.3 (PyPy3 is still supported), and drops support for MongoDB versions older than 2.6.
  Refer to https://api.mongodb.com/python/3.6.0/changelog.html.

• elasticsearch (required when sync to ES)

Notice

• source is a replica set of MongoDB v2.4 or later
• the following databases is ignored
  • admin
  • local
• the following collections is ignored
  • system.users
  • system.profile
• create users for destination manually if necessary
• authenticate with superuser if source authentication is enabled
• sync sharded-cluster by running a process for each shard, first of all, guarantee that balancer is off
• not support geospatial index

Usage

sync

usage: sync.py [-h] [-f [CONFIG]] [--src [SRC]] [--src-authdb [SRC_AUTHDB]]
               [--src-username [SRC_USERNAME]] [--src-password [SRC_PASSWORD]]
               [--dst [DST]] [--dst-authdb [DST_AUTHDB]]
               [--dst-username [DST_USERNAME]] [--dst-password [DST_PASSWORD]]
               [--start-optime [START_OPTIME]]
               [--optime-logfile [OPTIME_LOGFILE]] [--logfile [LOGFILE]]

Sync data from a replica-set to another MongoDB/Elasticsearch.

optional arguments:
  -h, --help            show this help message and exit
  -f [CONFIG], --config [CONFIG]
                        configuration file, note that command options will
                        override items in config file
  --src [SRC]           source should be hostportstr of a replica-set member
  --src-authdb [SRC_AUTHDB]
                        src authentication database, default is 'admin'
  --src-username [SRC_USERNAME]
                        src username
  --src-password [SRC_PASSWORD]
                        src password
  --dst [DST]           destination should be hostportstr of a mongos or
                        mongod instance
  --dst-authdb [DST_AUTHDB]
                        dst authentication database, default is 'admin', for
                        MongoDB
  --dst-username [DST_USERNAME]
                        dst username, for MongoDB
  --dst-password [DST_PASSWORD]
                        dst password, for MongoDB
  --start-optime [START_OPTIME]
                        timestamp in second, indicates oplog based increment
                        sync
  --optime-logfile [OPTIME_LOGFILE]
                        optime log file path, use this as start optime if
                        without '--start-optime'
  --logfile [LOGFILE]   log file path

Configurations

Use TOML as configuration file format.

src

Source config items.

• src.hosts - hostportstr of a member of replica set
• src.authdb - authentiction database
• src.username - username
• src.password - password

dst

Destination config items.

• MongoDB refer to mongo_conf.toml

  • dst.mongo.hosts
  • dst.mongo.authdb
  • dst.mongo.username
  • dst.mongo.password

• Elasticsearch refer to es_conf.toml

  • dst.type
  • dst.hosts

sync

Custom sync options.

sync.dbs specfies the databases to sync. sync.dbs.colls specifies the collections to sync.

• sync.dbs - databases to sync, sync all databases if not specify
  • sync.dbs.db - source database name
  • sync.dbs.rename_db - destination database name, stay the same if not specify
  • sync.dbs.colls - collectons to sync, sync all collections if not specify

coll in sync.dbs.colls element specifies the collection to sync. fileds in sync.dbs.colls element specifies the fields of current collection to sync.

log

• log.filepath - log file path, write to stdout if empty or not set