Percona Link for MongoDB startup configuration¶ When starting the plm process, you can use the following options: --port: The port on which the server will listen (default: 2242) --source: The MongoDB connection string for the source cluster --target: The MongoDB connection string for the target cluster --log-level: The log level (default: “info”) --log-json: Output log in JSON format with disabled color --no-color: Disable log ASCI color Example: $ plm \ --source <source-mongodb-uri> \ --target <target-mongodb-uri> \ --port 2242 \ --log-level debug \ --log-json Environment variables¶ Alternatively, you can define the following environment variables: Variable Description Default PLM_SOURCE_URI MongoDB connection string for the source cluster - PLM_TARGET_URI MongoDB connection string for the target cluster - PLM_PORT Server port number 2242 PLM_CLONE_NUM_PARALLEL_COLLECTIONS Number of collections cloned in parallel 2 PLM_CLONE_NUM_READ_WORKERS Number of read workers for cloning NumCPU / 4 PLM_CLONE_NUM_INSERT_WORKERS Number of insert workers for cloning NumCPU * 4 Last update: December 23, 2025 Created: December 23, 2025 Was this page helpful? Thanks for your feedback! Thanks for your feedback! Want to improve this page? Click Edit this page on GitHub above to submit a pull request..