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livebook/docs/deployment/clustering.md
Alexandre de Souza d4752ebd52
Add support for DNS clustering (#2578)
2024-04-23 15:40:18 -03:00

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Clustering

If you plan to run several Livebook instances behind a load balancer, you need to enable clustering via the LIVEBOOK_CLUSTER environment variable in your Docker image. LIVEBOOK_DISTRIBUTION is automatically set to name if clustering is enabled.

Depending on the clustering strategy of your choice, you must set additional environment variables, oftentimes, at runtime. When using the Livebook Docker image, you can create a file at /app/user/env.sh that exports the necessary environment variables. This file is invoked right before booting Livebook.

You may set LIVEBOOK_CLUSTER to one of the following values.

fly

It automatically sets up a cluster to run on Fly using DNS configuration. Behind the scenes, it sets the relevant environment variables and enables IPv6 support.

dns:QUERY

Sets up a cluster using DNS for queries for A/AAAA records to discover new nodes. Additionally, you must additionally set the following env vars:

  • LIVEBOOK_NODE=livebook_server@MACHINE_IP, where MACHINE_IP is the machine IP of each deployed node

  • You must set LIVEBOOK_SECRET_KEY_BASE and LIVEBOOK_COOKIE to different random values (use openssl rand -base64 48 to generate said values)

  • If your cloud requires IPv6, also set ERL_AFLAGS="-proto_dist inet6_tcp"