Docker configuration
All Docker-related variables are mandatory unless otherwise stated and are described in the following table.
| Variable | File | Description |
|---|---|---|
| docker_ee_url | group_vars/all/vault | Note: This is a private link to your Docker EE subscription. The value for docker_ee_url is the URL documented at the following address: https://docs.docker.com/engine/installation/linux/docker-ee/rhel/. |
| docker_ee_reponame | group_vars/all/vars | Specifies the repo to use. For Docker EE 2.1, this variable should be set to the value stable-18.09 |
| docker_ee_version | group_vars/all/vars | Optional. Can be used to download an exact version of Docker EE from the repo specified in docker_ee_reponame |
| rhel_version | group_vars/all/vars | For the Docker installation, this sets the version of your RHEL OS, such as 7.6. The playbooks were tested with RHEL 7.6. |
| dtr_version | group_vars/all/vars | Version of the Docker DTR you wish to install. You can use a numeric version or latest for the most recent one. The playbooks were tested with 2.6.4 |
| ucp_version | group_vars/all/vars | Version of the Docker UCP you wish to install. You can use a numeric version or latest for the most recent one. The playbooks were tested with UCP 3.1.4. |
| images_folder | group_vars/all/vars | Directory in the NFS server that will be mounted in the DTR nodes and that will host your Docker images. |
| license_file | group_vars/all/vars | Full path to your Docker EE license file on your Ansible host. The license file is available from the Docker Store |
| ucp_username | group_vars/all/vars | Username of the administrator user for UCP and DTR, typically admin. |
| ucp_password | group_vars/all/vault | The password for the ucp_username account. |
| docker_storage_driver | group_vars/all/vars | Storage driver for Docker nodes. The only accepted value is overlay2 (Previously, devicemapper was supported but this has been deprecated as it is no longer supported by Docker on RHEL 7.5 and 7.6) |
To see how to use customer-supplied certificates with UCP and DTR, see Appendix B.
Storing DTR images on external NFS server
Using a combination of images_folder and nfs_external_server variables, you can host your DTR images
on an NFS server. If the variable nfs_external_server is unset or commented out, the NFS VM is used by default.
When using an external NFS server such as the one hosted by 3PAR, you need to create the file share matching the name stored in images_folder manually, as
shown in the section Using HPE 3PAR when deploying NFS provisioner for Kubernetes. If you are using the NFS VM, the file share is created automatically by the playbooks.