Simple Cassandra database migration program
Simple Cassandra schema migration tool.
Runpip install cassandra-migrate, or python ./setup.py
Unlike other available tools, this one: - Written in Python for easy installation - Does not require cqlsh, just the Python driver - Supports baselining existing database to given versions - Supports partial advancement - Supports locking for concurrent instances using Lightweight Transactions - Verifies stored migrations against configured migrations - Stores content, checksum, date and state of every migration - Supports deploying with different keyspace configurations for different environments
Databases are configured through YAML files. For example:
keyspace: herbie profiles: prod: replication: class: SimpleStrategy replication_factor: 3 migrations_path: ./migrations
Where the migrations folder (relative to the config file). contains .cql files.
The files are loaded in lexical order. The default convention is name them in the form: v001_my_migration.cql.
Profiles can be defined in the configuration file. They can configure the replication and durable_writes parameters for CREATE KEYSPACE. A default dev profile is implicitly defined using a replication factor of 1.
-H HOSTS, --hosts HOSTS Comma-separated list of contact points -p PORT, --port PORT Connection port -u USER, --user USER Connection username -P PASSWORD, --password PASSWORD Connection password -c CONFIG_FILE, --config-file CONFIG_FILE Path to configuration file -m PROFILE, --profile PROFILE Name of keyspace profile to use
Advances a database to the latest (or chosen) version of migrations. Creates the keyspace and migrations table if necessary.
Migrate will refuse to run if a previous attempt failed. To override that after cleaning up any leftovers (as Cassandra has no DDL transactions), use the --force option.
# Migrate to the latest database version using the default configuration file, # connecting to Cassandra in the local machine. cassandra-migrate -H 127.0.0.1 migrate # Migrate to version 2 using a specific config file. cassandra-migrate -c mydb.yml migrate 2 # Migrate to a version by name. cassandra-migrate migrate v005_my_changes.cql # Force migration after a failure cassandra-migrate migrate 2 --force
Reset the database by dropping an existing keyspace, then running a migration.
# Reset the database to the latest version cassandra-migrate reset # Reset the database to a specifis version cassandra-migrate reset 3
Advance an existing database version without actually running the migrations.
Useful for starting to manage a pre-existing database without recreating it from scratch.
# Baseline the existing database to the latest version cassandra-migrate baseline # Baseline the existing database to a specific version cassandra-migrate baseline 5
Print the current status of the database.
Generate a new empty migration file with an incremented version, with a file named using the basic convention (vNNN_description.cql) in the configured migrations_path.
cassandra-migrate generate "My migration description"
- Implement status
- Ask for confirmation before applying dangerous commands
- Support Python migrations (instead of just CQL)
Copyright (C) 2017 Cobli Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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