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Update upgrade.md

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Add upgrade path using yaml
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Here we cover how to upgrade to Longhorn v0.3.1 from all previous releases. Here we cover how to upgrade to Longhorn v0.3.1 from all previous releases.
## Upgrading from v0.3.x ## From v0.3.x
### From Longhorn deployment yaml
If you didn't change any configuration during Longhorn v0.3.0 installation, follow [the official Longhorn Deployment instructions](../README.md#deployment) to upgrade.
Otherwise you will need to download the yaml file from [the official Longhorn Deployment instructions](../README.md#deployment), modify it to your need (e.g. choosing different storage driver), then use `kubectl apply -f` to upgrade.
### From Longhorn App (Rancher Catalog App)
On Rancher UI, navigate to the `Catalog Apps` screen and click the On Rancher UI, navigate to the `Catalog Apps` screen and click the
`Upgrade available` button. Do not change any of the settings. *Do not change `Upgrade available` button. Do not change any of the settings. *Do not change
any of the settings right now.* Click `Upgrade`. any of the settings right now.* Click `Upgrade`.
@ -13,7 +20,7 @@ bottom left corner of the screen changes. Wait until websocket indicators in
bottom right corner of the screen turn solid green. Navigate to bottom right corner of the screen turn solid green. Navigate to
`Setting> Engine Image` and wait until the new Engine Image is `Ready`. `Setting> Engine Image` and wait until the new Engine Image is `Ready`.
## Upgrading from v0.2 and older ## From v0.2 and older
The upgrade procedure for Longhorn v0.2 and v0.1 deployments is more involved. The upgrade procedure for Longhorn v0.2 and v0.1 deployments is more involved.