Merge pull request #48911 from vaibhav2107/inherit-eviction

Document MergeDefaultEvictionSettings Kubelet Config

Author: k8s-ci-robot

content/en/docs/concepts/scheduling-eviction/node-pressure-eviction.md

@@ -227,7 +227,10 @@ These default values of hard eviction thresholds will only be set if none
 of the parameters is changed. If you change the value of any parameter,
 then the values of other parameters will not be inherited as the default
 values and will be set to zero. In order to provide custom values, you
-should provide all the thresholds respectively.
+should provide all the thresholds respectively. You can also set the kubelet config
+MergeDefaultEvictionSettings to true in the kubelet configuration file.
+If set to true and any paramater is changed, then the other parameters will
+inherit their default values instead of 0.
 
 The `containerfs.available` and `containerfs.inodesFree` (Linux nodes) default
 eviction thresholds will be set as follows:

content/en/docs/tasks/administer-cluster/kubelet-config-file.md

@@ -70,6 +70,9 @@ In the example, by changing the default value of only one parameter for
 evictionHard, the default values of other parameters will not be inherited and
 will be set to zero. In order to provide custom values, you should provide all
 the threshold values respectively.
+Alternatively, you can set the MergeDefaultEvictionSettings to true in the kubelet
+configuration file, if any parameter is changed then the other parameters will inherit
+their default values instead of 0.
 {{< /note >}}
 
 The `imagefs` is an optional filesystem that container runtimes use to store container
@@ -248,6 +251,7 @@ they can follow these steps to inspect the kubelet configuration:
          "imagefs.inodesFree": "5%"
        },
        "evictionPressureTransitionPeriod": "1m0s",
+       "mergeDefaultEvictionSettings": false,
        "enableControllerAttachDetach": true,
        "makeIPTablesUtilChains": true,
        "iptablesMasqueradeBit": 14,