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54 lines
2.6 KiB
Markdown
54 lines
2.6 KiB
Markdown
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# Upgrade your cluster
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Constellation provides an easy way to upgrade all components of your cluster, without disrupting it's availability.
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Specifically, you can upgrade the Kubernetes version, the nodes' image, and the Constellation microservices.
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You configure the desired versions in your local Constellation configuration and trigger upgrades with the `upgrade apply` command.
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To learn about available versions you use the `upgrade check` command.
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Which versions are available depends on the CLI version you are using.
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## Update the CLI
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Each CLI comes with a set of supported microservice and Kubernetes versions.
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Most importantly, a given CLI version can only upgrade a cluster of the previous minor version, but not older ones.
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This means that you have to upgrade your CLI and cluster one minor version at a time.
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For example, if you are currently on CLI version v2.6 and the latest version is v2.8, you should
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* upgrade the CLI to v2.7,
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* upgrade the cluster to v2.7,
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* and only then continue upgrading the CLI (and the cluster) to v2.8 after.
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Also note that if your current Kubernetes version isn't supported by the next CLI version, use your current CLI to upgrade to a newer Kubernetes version first.
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To learn which Kubernetes versions are supported by a particular CLI, run [constellation config kubernetes-versions](../reference/cli.md#constellation-config-kubernetes-versions).
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## Migrate the configuration
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The Constellation configuration file is located in the file `constellation-conf.yaml` in your workspace.
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Refer to the [migration reference](../reference/config-migration.md) to check if you need to update fields in your configuration file.
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## Check for upgrades
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To learn which versions the current CLI can upgrade to and what's installed in your cluster, run:
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```bash
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constellation upgrade check
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```
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You can either enter the reported target versions into your config manually or run the above command with the `--write-config` flag.
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When using this flag, the `kubernetesVersion`, `image`, and `microserviceVersion` fields are overwritten with the smallest available upgrade.
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## Apply the upgrade
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Once you updated your config with the desired versions, you can trigger the upgrade with this command:
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```bash
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constellation upgrade apply
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```
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Microservice upgrades will be finished within a few minutes, depending on the cluster size.
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If you are interested, you can monitor pods restarting in the `kube-system` namespace with your tool of choice.
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Image and Kubernetes upgrades take longer.
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For each node in your cluster, a new node has to be created and joined.
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The process usually takes up to ten minutes per node.
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