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# Calico (Master)
Configure Calico components for the Master host.
## Requirements
* Ansible 2.2
## Warning: This Calico Integration is in Alpha
Calico shares the etcd instance used by OpenShift, and distributes client etcd certificates to each node.
For this reason, **we do not (yet) recommend running Calico on any production-like
cluster, or using it for any purpose besides early access testing.**
## Installation
To install, set the following inventory configuration parameters:
* `openshift_use_calico=True`
* `openshift_use_openshift_sdn=False`
* `os_sdn_network_plugin_name='cni'`
## Additional Calico/Node and Felix Configuration Options
Additional parameters that can be defined in the inventory are:
| Environment | Description | Schema | Default |
|---------|----------------------|---------|---------|
|CALICO_IPV4POOL_CIDR| The IPv4 Pool to create if none exists at start up. It is invalid to define this variable and NO_DEFAULT_POOLS. |IPv4 CIDR | 192.168.0.0/16 |
| CALICO_IPV4POOL_IPIP | IPIP Mode to use for the IPv4 POOL created at start up. | off, always, cross-subnet | always |
| CALICO_LOG_DIR | Directory on the host machine where Calico Logs are written.| String | /var/log/calico |
### Contact Information
Author: Dan Osborne <dan@projectcalico.org>
For support, join the `#openshift` channel on the [calico users slack](calicousers.slack.com).
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