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Creating multi-server clusters
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Creating multi-server clusters
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< h1 id = "creating-multi-server-clusters" > Creating multi-server clusters< a class = "headerlink" href = "#creating-multi-server-clusters" title = "Permanent link" > ¶ < / a > < / h1 >
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< p > For the best results (and less unexpected issues), choose 1, 3, 5, … server nodes.< / p >
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< h2 id = "embedded-dqlite" > Embedded dqlite< a class = "headerlink" href = "#embedded-dqlite" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Create a cluster with 3 server nodes using k3s’ embedded dqlite database.
The first server to be created will use the < code > --cluster-init< / code > flag and k3d will wait for it to be up and running before creating (and connecting) the other server nodes.< / p >
< div class = "highlight" > < pre > < span > < / span > < code > k3d cluster create multiserver --servers < span class = "m" > 3< / span >
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< h2 id = "adding-server-nodes-to-a-running-cluster" > Adding server nodes to a running cluster< a class = "headerlink" href = "#adding-server-nodes-to-a-running-cluster" title = "Permanent link" > ¶ < / a > < / h2 >
< p > In theory (and also in practice in most cases), this is as easy as executing the following command:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > k3d node create newserver --cluster multiserver --role server
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< p class = "admonition-title" > There’ s a trap!< / p >
< p > 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 < code > --cluster-init< / code > flag and thus is not using the dqlite backend.< / p >
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