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46 lines
1.9 KiB
Markdown
46 lines
1.9 KiB
Markdown
---
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description: Add a new replica to an existing DTR cluster
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keywords: docker, dtr, cli, join
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title: docker/dtr join
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---
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Add a new replica to an existing DTR cluster
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## Usage
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```bash
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docker run -it --rm docker/dtr \
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join [command options]
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```
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## Description
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This command installs DTR on the Docker Engine that runs the command,
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and joins the new installation to an existing cluster.
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To set up a cluster with high-availability, add 3, 5, or 7 nodes to
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the cluster.
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## Options
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| Option | Description |
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|:--------------------------|:---------------------------|
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|`--ucp-url`|Specify the UCP controller URL including domain and port|
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|`--ucp-username`|Specify the UCP admin username|
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|`--ucp-password`|Specify the UCP admin password|
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|`--debug`|Enable debug mode, provides additional logging|
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|`--hub-username`|Specify the Docker Hub username for pulling images|
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|`--hub-password`|Specify the Docker Hub password for pulling images|
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|`--ucp-insecure-tls`|Disable TLS verification for UCP|
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|`--ucp-ca`|Use a PEM-encoded TLS CA certificate for UCP|
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|`--ucp-node`|Specify the host to install Docker Trusted Registry|
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|`--replica-id`|Specify the replica ID. Must be unique per replica, leave blank for random|
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|`--unsafe`|Enable this flag to skip safety checks when installing or joining|
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|`--existing-replica-id`|ID of an existing replica in a cluster|
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|`--replica-http-port`|Specify the public HTTP port for the DTR replica; 0 means unchanged/default|
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|`--replica-https-port`|Specify the public HTTPS port for the DTR replica; 0 means unchanged/default|
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|`--skip-network-test`|Enable this flag to skip the overlay networking test|
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|`--extra-envs`|List of extra environment variables to use for deploying the DTR containers for the replica. This can be used to specify swarm constraints. Separate the environment variables with ampersands (&). You can escape actual ampersands with backslashes (\). Can't be used in combination with --ucp-node|
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