9.5.2. Node Health Strategy

Pacemaker assigns a node health score to each node, as the sum of the values of all its node health attributes. This score will be used as a location constraint applied to this node for all resources.

The node-health-strategy cluster option controls how Pacemaker responds to changes in node health attributes, and how it translates red, yellow, and green to scores.

Allowed values are:

Table 9.5. Node Health Strategies

Value	Effect
`none`	Do not track node health attributes at all.
`migrate-on-red`	Assign the value of `-INFINITY` to `red`, and 0 to `yellow` and `green`. This will cause all resources to move off the node if any attribute is `red`.
`only-green`	Assign the value of `-INFINITY` to `red` and `yellow`, and 0 to `green`. This will cause all resources to move off the node if any attribute is `red` or `yellow`.
`progressive`	Assign the value of the `node-health-red` cluster option to `red`, the value of `node-health-yellow` to `yellow`, and the value of `node-health-green` to `green`. Each node is additionally assigned a score of `node-health-base` (this allows resources to start even if some attributes are `yellow`). This strategy gives the administrator finer control over how important each value is.
`custom`	Track node health attributes using the same values as `progressive` for `red`, `yellow`, and `green`, but do not take them into account. The administrator is expected to implement a policy by defining rules (see Chapter 8, Rules) referencing node health attributes.