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spell errors: misusing a and an
Signed-off-by: tim-zju <21651152@zju.edu.cn>
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@ -123,7 +123,7 @@ Now that your UCP controller is installed, you need to license it.
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## Step 7: Backup the controller CAs
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For an highly available installation, you can add more controller nodes to
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For a highly available installation, you can add more controller nodes to
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the UCP cluster. The controller nodes are replicas of each other.
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For this, you need to make the CAs on each controller node use the same
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@ -149,7 +149,7 @@ To create a backup of the CAs used on the controller node:
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This step is optional.
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For an highly available installation, you can add more controller nodes to
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For a highly available installation, you can add more controller nodes to
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the UCP cluster. For that, use the `docker/ucp join --replica` command.
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[Learn more about the join command](../reference/join.md).
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@ -251,4 +251,4 @@ certificate bundle.
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## Where to go next
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* [Deploy an app from the UI](../applications/deploy-app-ui.md)
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* [Monitor a UCP cluster](../monitor/monitor-ucp.md)
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* [Monitor a UCP cluster](../monitor/monitor-ucp.md)
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