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Merge pull request #611 from a7i/docs-remove-redundant-strategies

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Update README to remove redundant list of strategies
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Kubernetes Prow Robot
2021-08-02 08:11:22 -07:00
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@@ -121,31 +121,21 @@ See the [user guide](docs/user-guide.md) in the `/docs` directory.
## Policy and Strategies
Descheduler's policy is configurable and includes strategies that can be enabled or disabled.
Nine strategies
1. `RemoveDuplicates`
2. `LowNodeUtilization`
3. `HighNodeUtilization`
4. `RemovePodsViolatingInterPodAntiAffinity`
5. `RemovePodsViolatingNodeAffinity`
6. `RemovePodsViolatingNodeTaints`
7. `RemovePodsViolatingTopologySpreadConstraint`
8. `RemovePodsHavingTooManyRestarts`
9. `PodLifeTime`
are currently implemented. As part of the policy, the
parameters associated with the strategies can be configured too. By default, all strategies are enabled.
Descheduler's policy is configurable and includes strategies that can be enabled or disabled. By default, all strategies are enabled.
The following diagram provides a visualization of most of the strategies to help
categorize how strategies fit together.
The policy includes a common configuration that applies to all the strategies:
| Name | Default Value | Description |
|------|---------------|-------------|
| `nodeSelector` | `nil` | limiting the nodes which are processed |
| `evictLocalStoragePods` | `false` | allows eviction of pods with local storage |
| `evictSystemCriticalPods` | `false` | [Warning: Will evict Kubernetes system pods] allows eviction of pods with any priority, including system pods like kube-dns |
| `ignorePvcPods` | `false` | set whether PVC pods should be evicted or ignored |
| `maxNoOfPodsToEvictPerNode` | `nil` | maximum number of pods evicted from each node (summed through all strategies) |
![Strategies diagram](strategies_diagram.png)
As part of the policy, the parameters associated with each strategy can be configured.
See each strategy for details on available parameters.
The policy also includes common configuration for all the strategies:
- `nodeSelector` - limiting the nodes which are processed
- `evictLocalStoragePods` - allows eviction of pods with local storage
- `evictSystemCriticalPods` - [Warning: Will evict Kubernetes system pods] allows eviction of pods with any priority, including system pods like kube-dns
- `ignorePvcPods` - set whether PVC pods should be evicted or ignored (defaults to `false`)
- `maxNoOfPodsToEvictPerNode` - maximum number of pods evicted from each node (summed through all strategies)
**Policy:**
```yaml
apiVersion: "descheduler/v1alpha1"
@@ -159,6 +149,11 @@ strategies:
...
```
The following diagram provides a visualization of most of the strategies to help
categorize how strategies fit together.
![Strategies diagram](strategies_diagram.png)
### RemoveDuplicates
This strategy makes sure that there is only one pod associated with a ReplicaSet (RS),