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21 lines
1.2 KiB
Markdown
21 lines
1.2 KiB
Markdown
# Clustering
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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.
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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.
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You may set `LIVEBOOK_CLUSTER` to one of the following values.
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## `fly`
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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.
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## `dns:QUERY`
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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:
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* `LIVEBOOK_NODE=livebook_server@MACHINE_IP`, where `MACHINE_IP` is the machine IP of each deployed node
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* You must set `LIVEBOOK_SECRET_KEY_BASE` and `LIVEBOOK_COOKIE` to different random values (use `openssl rand -base64 48` to generate said values)
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* If your cloud requires IPv6, also set `ERL_AFLAGS="-proto_dist inet6_tcp"`
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