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Appendix A. Sample Environment File: Creating a Ceph Cluster
The following custom environment file uses many of the options described throughout Chapter 2, Creating an Overcloud with Ceph Storage Nodes. This sample does not include any commented-out options. For an overview on environment files, see Environment Files (from the Advanced Overcloud Customization guide).
/home/stack/templates/storage-environment.yaml
- 1
- The
resource_registrysection defines resources linked to heat templates. The first three entries (CephMon,CephOSD, andCephClient) link the heat templates used to define the different components of the Ceph cluster (MON, OSD, and client). - 2
- The
OS::TripleO::Services::CinderBackupentry calls the heat template required to deploy the Block Storage Backup service. You can set the backup target later on in theparameter_defaultssection. - 3
- The
OS::TripleO::Services::CephRgwentry calls the heat template required to deploy the Ceph Object Gateway, which in turn provides the means for OpenStack to use Ceph Object Storage. The following three lines disable the default Object Storage service (swift), as it will not be needed. See Section 2.8, “Deploy the Ceph Object Gateway” for details. - 4
- The
OS::TripleO::NodeUserData:entry uses a template (/home/stack/templates/firstboot/wipe-disks.yaml) that checks all disks on Ceph Storage node and converts all of them (except the disk containing the root file system) to GPT using a custom script. For more details, see Section 2.10, “Formatting Ceph Storage Node Disks to GPT”. - 5
- The
parameter_defaultssection modifies the default values for parameters in all templates. Most of the entries listed here are described in Section 2.6, “Enabling Ceph Storage in the Overcloud”. - 6
- As you are deploying the Ceph Object Gateway, you can then use Ceph Object Storage as a backup target. To configure this, set
CinderBackupBackendtoswift. See Section 2.8, “Deploy the Ceph Object Gateway” for details. - 7
- The
ceph::profile::params::osds::section defines a custom disk layout, as described in Section 2.7, “Mapping the Ceph Storage Node Disk Layout”. - 8
- The
CephPoolssection sets custom attributes for any Ceph pool. This example sets customsize,pg_num, andpgp_numattributes for thevolumespool. See Section 2.12.1, “Assigning Custom Attributes to Different Ceph Pools” for more details.
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