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docs are good :)

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David M Noriega 2017-09-29 14:06:30 -07:00
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@ -36,6 +36,29 @@ Docker Compose installation options.
(Used only for RedHat/CentOS.) You can enable the Edge or Test repo by setting the respective vars to `1`. (Used only for RedHat/CentOS.) You can enable the Edge or Test repo by setting the respective vars to `1`.
### devicemapper
Out of the box this role deploys docker with the overlay driver, but the only
officially supported configuration of Docker on RedHat/CentOS is to use device
mapper as the storage driver (Not to be confused with `docker volume`). Docker
can configure the lvm thin provisioning when provided a raw block device (such
as a second disk). To deploy this configuration, set the following variables in
your deploy:
docker_devicemapper_raw_device: /dev/sdb # Or /dev/vdb or ...
docker_configure_daemon: true
For more information, see the [device mapper driver][devicemapper] documentation.
### Docker daemon configuration
To configure devicemapper as the storage driver, this role has to configure the
docker daemon via `daemon.json`, but you can also use this to configure the
daemon as you wish by overriding `docker_daemon_config`. This yaml hash is then
converted to json. Making changes to `daemon.json` then require a restart of the
service, but this role does not default to restarting the service. To trigger a
restart when reconfiguring the daemon, set `docker_restart` to `true`.
## Use with Ansible (and `docker` Python library) ## Use with Ansible (and `docker` Python library)
Many users of this role wish to also use Ansible to then _build_ Docker images and manage Docker containers on the server where Docker is installed. In this case, you can easily add in the `docker` Python library using the `geerlingguy.pip` role: Many users of this role wish to also use Ansible to then _build_ Docker images and manage Docker containers on the server where Docker is installed. In this case, you can easily add in the `docker` Python library using the `geerlingguy.pip` role:
@ -71,3 +94,5 @@ MIT / BSD
## Author Information ## Author Information
This role was created in 2017 by [Jeff Geerling](https://www.jeffgeerling.com/), author of [Ansible for DevOps](https://www.ansiblefordevops.com/). This role was created in 2017 by [Jeff Geerling](https://www.jeffgeerling.com/), author of [Ansible for DevOps](https://www.ansiblefordevops.com/).
[devicemapper]: https://docs.docker.com/engine/userguide/storagedriver/device-mapper-driver/