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README-scale.md

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instack-undercloud scale mode

instack-undercloud offers 2 deployment modes: poc and scale.

In poc mode, a minimal baremtal flavor is automatically created and used as the flavor for all the different role types in an overcloud. Nodes with different hardware characteristics will be used for any role type as long as they meet the requirements of the minimal baremetal flavor. Poc mode is the default, and matches the existing virtual environement setups behavior that currently exists.

In scale mode, no initial flavors are created. Instead, the deployer must create a flavor per hardware profile they intend to use in their deployment. They must also assign each of these flavors to overcloud roles via Heat template parameters.

The following steps can be used to setup an undercloud in scale deployment mode.

  1. On the virt host, make any hardware characteristic changes to the baremetal VM's created as part of instack-virt-setup. You can make changes to CPU, Disk, and Memory.

  2. In the instack.answers file, before running the installation script, set DEPLOYMENT_MODE to scale.

     DEPLOYMENT_MODE=scale

  3. After the completed installation, create the baremetal flavors to correspond to the overcloud roles you intend to deploy. These are example commands.

     nova flavor-create control auto 4096 40 2
 nova flavor-create compute auto 1024 40 1
 nova flavor-create blockstorage auto 1024 40 1
 nova flavor-create swiftstorage auto 1024 40 1
 deploy_kernel_id=$(glance image-show bm-deploy-kernel | awk ' / id / {print $4}')
 deploy_ramdisk_id=$(glance image-show bm-deploy-ramdisk | awk ' / id / {print $4}')
 nova flavor-key control set "cpu_arch"="x86_64" "baremetal:deploy_kernel_id"="$deploy_kernel_id" "baremetal:deploy_ramdisk_id"="$deploy_ramdisk_id"
 nova flavor-key compute set "cpu_arch"="x86_64" "baremetal:deploy_kernel_id"="$deploy_kernel_id" "baremetal:deploy_ramdisk_id"="$deploy_ramdisk_id"
 nova flavor-key blockstorage set "cpu_arch"="x86_64" "baremetal:deploy_kernel_id"="$deploy_kernel_id" "baremetal:deploy_ramdisk_id"="$deploy_ramdisk_id"
 nova flavor-key swiftstorage set "cpu_arch"="x86_64" "baremetal:deploy_kernel_id"="$deploy_kernel_id" "baremetal:deploy_ramdisk_id"="$deploy_ramdisk_id"

  4. Before running instack-deploy-overcloud, edit instackenv.json and update the node hardware characterists to match what edits you made to the actual VM's.

  5. Export the folling environment variables to set Heat Parmeters for the flavors to use for each Overcloud role. Any of the following parameters not set will default to "baremetal".

     export OVERCLOUD_CONTROL_FLAVOR=control
 export OVERCLOUD_COMPUTE_FLAVOR=compute
 export OVERCLOUD_BLOCKSTORAGE_FLAVOR=blockstorage
 export OVERCLOUD_SWIFTSTORAGE_FLAVOR=swiftstorage

  6. Continue deploying an Overcloud as normal by sourceing deploy-overcloudrc and running instack-deploy-overcloud.