## Support to AutoScaling

updated: 2020-10-17 18:54

# Support to AutoScaling

The senlin service provides a rich set of facilities for building an auto-scaling solution:

- Operations: The `CLUSTER_SCALE_OUT`, `CLUSTER_SCALE_IN` operations are the simplest form of commands to scale a cluster. The `CLUSTER_RESIZE` operation, on the other hand, provides more options for controlling the detailed cluster scaling behavior. These operations can be performed with and without policies attached to a cluster.

- Policies:

  The `senlin.policy.scaling` (link) policy can be applied to fine tune the cluster scaling operations.

  The `senlin.policy.deletion` (link) policy can be attached to a cluster to control how nodes are removed from a cluster.

  The `senlin.policy.affinity` (link) policy can be used to control how node affinity or anti-affinity can be enforced.

  The `senlin.policy.region_placement` (link) can be applied to scale a cluster across multiple regions.

  The `senlin.policy.zone_placement` (link) can be enforced to achieve a cross-availability-zone node distribution.

- Receivers: The receiver (link) concept provides a channel to which you can send signals or alarms from an external monitoring software or service so that scaling operations can be automated.

This section provides some guides on integrating senlin with other services so that cluster scaling can be automated.

updated: 2020-10-17 18:54

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