docker/dtr join

Estimated reading time: 2 minutes

Add a new replica to an existing DTR cluster

Usage

$ docker run -it --rm docker/dtr \
   join [command options]

Description

This command installs DTR on the Docker Engine that runs the command, and joins the new installation to an existing cluster.

To set up a cluster with high-availability, add 3, 5, or 7 nodes to the cluster.

Options

Option Description
--ucp-url Specify the UCP controller URL including domain and port
--ucp-username Specify the UCP admin username
--ucp-password Specify the UCP admin password
--debug Enable debug mode, provides additional logging
--hub-username Specify the Docker Hub username for pulling images
--hub-password Specify the Docker Hub password for pulling images
--ucp-insecure-tls Disable TLS verification for UCP
--ucp-ca Use a PEM-encoded TLS CA certificate for UCP
--ucp-node Specify the host to install Docker Trusted Registry
--replica-id Specify the replica ID. Must be unique per replica, leave blank for random
--unsafe Enable this flag to skip safety checks when installing or joining
--existing-replica-id ID of an existing replica in a cluster
--replica-http-port Specify the public HTTP port for the DTR replica; 0 means unchanged/default
--replica-https-port Specify the public HTTPS port for the DTR replica; 0 means unchanged/default
--skip-network-test Enable this flag to skip the overlay networking test
--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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