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k3d/docs/usage/multimaster.md
iwilltry42 ec3f10ec57
use server/agent instead of master/worker
2020-07-14 20:29:33 +02:00

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Creating multi-server clusters

!!! info "Important note" For the best results (and less unexpected issues), choose 1, 3, 5, ... server nodes.

Embedded dqlite

Create a cluster with 3 server nodes using k3s' embedded dqlite database. The first server to be created will use the --cluster-init flag and k3d will wait for it to be up and running before creating (and connecting) the other server nodes.

    k3d cluster create multiserver --servers 3

Adding server nodes to a running cluster

In theory (and also in practice in most cases), this is as easy as executing the following command:

    k3d node create newserver --cluster multiserver --role server

!!! important "There's a trap!" If your cluster was initially created with only a single server node, then this will fail. That's because the initial server node was not started with the --cluster-init flag and thus is not using the dqlite backend.