Define reserve nodes when creating deployment
This article describes how to define reserve nodes when creating an Exasol 8 deployment.
Prerequisites
This procedure is part of the installation procedure when deploying Exasol as an application on Linux hosts. For information about the full installation procedure, see Install Exasol - step by step.
Procedure
This procedure is part of the Installation stage.
To define reserve nodes when you create a deployment, add the parameter CCC_PLAY_RESERVE_NODES to the deployment configuration.
| Parameter | Description | Data type | Default value |
|---|---|---|---|
CCC_PLAY_RESERVE_NODES
|
The number of hosts to use as reserve nodes. |
integer | [empty] |
The reserve nodes are part of the total number of nodes. For example, deploying with 4 nodes and CCC_PLAY_RESERVE_NODES=1 results in a database with 3 active nodes and one reserve node.
The number of reserve nodes must be less than the total number of nodes.
Example configuration
CCC_HOST_ADDRS="10.0.0.11 10.0.0.12 10.0.0.13 10.0.0.14" CCC_HOST_DATADISK=/dev/mapper/exasol_disk_1,/dev/mapper/exasol_disk_2 CCC_HOST_IMAGE_USER=exasol CCC_HOST_IMAGE_PASSWORD=exasol123 CCC_HOST_KEY_PAIR_FILE=id_rsa CCC_PLAY_WORKING_COPY=@exasol-8.32.0 CCC_PLAY_DB_PASSWORD=exasol456 CCC_PLAY_RESERVE_NODES=1
