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7.2. Including Environment Files in Overcloud Creation

The -e includes an environment file to customize your Overcloud. You can include as many environment files as necessary. However, the order of the environment files is important as the parameters and resources defined in subsequent environment files take precedence. Use the following list as an example of the environment file order:
  • Any network isolation files, including the initialization file (environments/network-isolation.yaml) from the heat template collection and then your custom NIC configuration file. See Section 6.2, “Isolating Networks” for more information on network isolation.
  • Any external load balancing environment files.
  • Any storage environment files such as Ceph Storage, NFS, iSCSI, etc.
  • Any environment files for Red Hat CDN or Satellite registration.
  • Any other custom environment files.
Any environment files added to the Overcloud using the -e option become part of your Overcloud's stack definition. The director requires these environment files for re-deployment and post-deployment functions in Chapter 8, Performing Tasks after Overcloud Creation. Failure to include these files can result in damage to your Overcloud.
If you aim to later modify the Overcloud configuration, you should:
  1. Modify parameters in the custom environment files and Heat templates
  2. Run the openstack overcloud deploy command again with the same environment files
Do not edit the Overcloud configuration directly as such manual configuration gets overridden by the director's configuration when updating the Overcloud stack with the director.

Important

Save the original deployment command for later use and modification. For example, save your deployment command in a script file called deploy-overcloud.sh: 
#!/bin/bash
openstack overcloud deploy --templates \
  -e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml \
  -e ~/templates/network-environment.yaml \
  -e ~/templates/storage-environment.yaml \
  -t 150 \
  --control-scale 3 \
  --compute-scale 3 \
  --ceph-storage-scale 3 \
  --swift-storage-scale 0 \
  --block-storage-scale 0 \
  --compute-flavor compute \
  --control-flavor control \
  --ceph-storage-flavor ceph-storage \
  --swift-storage-flavor swift-storage \
  --block-storage-flavor block-storage \
  --ntp-server pool.ntp.org \
  --libvirt-type qemu
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This retains the Overcloud deployment command's parameters and environment files for future use, such as Overcloud modifications and scaling. You can then edit and rerun this script to suit future customizations to the Overcloud.
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