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Gérald Croës 2018-10-17 16:24:04 +02:00 • committed by Traefiker Bot
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docs/user-guide/cluster.md
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# Clustering / High Availability (beta)
This guide explains how to use Træfik in high availability mode.
This guide explains how to use Traefik in high availability mode.
In order to deploy and configure multiple Træfik instances, without copying the same configuration file on each instance, we will use a distributed Key-Value store.
In order to deploy and configure multiple Traefik instances, without copying the same configuration file on each instance, we will use a distributed Key-Value store.
## Prerequisites
@ -11,23 +11,23 @@ _(Currently, we recommend [Consul](https://consul.io) .)_
## File configuration to KV store migration
We created a special Træfik command to help configuring your Key Value store from a Træfik TOML configuration file.
We created a special Traefik command to help configuring your Key Value store from a Traefik TOML configuration file.
Please refer to [this section](/user-guide/kv-config/#store-configuration-in-key-value-store) to get more details.
## Deploy a Træfik cluster
## Deploy a Traefik cluster
Once your Træfik configuration is uploaded on your KV store, you can start each Træfik instance.
Once your Traefik configuration is uploaded on your KV store, you can start each Traefik instance.
A Træfik cluster is based on a manager/worker model.
A Traefik cluster is based on a manager/worker model.
When starting, Træfik will elect a manager.
When starting, Traefik will elect a manager.
If this instance fails, another manager will be automatically elected.
## Træfik cluster and Let's Encrypt
## Traefik cluster and Let's Encrypt
**In cluster mode, ACME certificates have to be stored in [a KV Store entry](/configuration/acme/#as-a-key-value-store-entry).**
Thanks to the Træfik cluster mode algorithm (based on [the Raft Consensus Algorithm](https://raft.github.io/)), only one instance will contact Let's encrypt to solve the challenges.
Thanks to the Traefik cluster mode algorithm (based on [the Raft Consensus Algorithm](https://raft.github.io/)), only one instance will contact Let's encrypt to solve the challenges.
The others instances will get ACME certificate from the KV Store entry.