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Merge pull request #28055 from ronnielai/doc

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Adding inode availability in eviction policy

Updates the proposal to include inodes as an eviction parameter.
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k8s-merge-robot 2016-07-01 18:04:12 -07:00 committed by GitHub
commit d499d65bef
1 changed files with 11 additions and 5 deletions
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docs/proposals/kubelet-eviction.md
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@ -75,7 +75,9 @@ The `kubelet` will support the ability to trigger eviction decisions on the foll
|------------------|---------------------------------------------------------------------------------|
| memory.available | memory.available := node.status.capacity[memory] - node.stats.memory.workingSet |
| nodefs.available | nodefs.available := node.stats.fs.available |
| nodefs.inodesFree | nodefs.inodesFree := node.fs.inodesFree |
| imagefs.available | imagefs.available := node.stats.runtime.imagefs.available |
| imagefs.inodesFree | imagefs.inodesFree := node.runtime.imageFs.inodesFree |
`kubelet` supports only two filesystem partitions.
@ -166,7 +168,7 @@ The following node conditions are defined that correspond to the specified evict
| Node Condition | Eviction Signal | Description |
|----------------|------------------|------------------------------------------------------------------|
| MemoryPressure | memory.available | Available memory on the node has satisfied an eviction threshold |
| DiskPressure | nodefs.available (or) imagefs.available | Available disk space on either the node's root filesytem or image filesystem has satisfied an eviction threshold |
| DiskPressure | nodefs.available, nodefs.inodesFree, imagefs.available, or imagefs.inodesFree | Available disk space and inodes on either the node's root filesytem or image filesystem has satisfied an eviction threshold |
The `kubelet` will continue to report node status updates at the frequency specified by
`--node-status-update-frequency` which defaults to `10s`.
@ -217,20 +219,24 @@ reclaim the resource that has met its eviction threshold.
Let's assume the operator started the `kubelet` with the following:
```
--eviction-hard="nodefs.available<1Gi,imagefs.available<10Gi"
--eviction-soft="nodefs.available<1.5Gi,imagefs.available<20Gi"
--eviction-hard="nodefs.available<1Gi,nodefs.inodesFree<1,imagefs.available<10Gi,imagefs.inodesFree<10"
--eviction-soft="nodefs.available<1.5Gi,nodefs.inodesFree<10,imagefs.available<20Gi,imagefs.inodesFree<100"
--eviction-soft-grace-period="nodefs.available=1m,imagefs.available=2m"
```
The `kubelet` will run a sync loop that looks at the available disk
on the node's supported partitions as reported from `cAdvisor`.
If available disk space on the node's primary filesystem is observed to drop below 1Gi,
If available disk space on the node's primary filesystem is observed to drop below 1Gi
or the free inodes on the node's primary filesystem is less than 1,
the `kubelet` will immediately initiate eviction.
If available disk space on the node's image filesystem is observed to drop below 10Gi,
If available disk space on the node's image filesystem is observed to drop below 10Gi
or the free inodes on the node's primary image filesystem is less than 10,
the `kubelet` will immediately initiate eviction.
If available disk space on the node's primary filesystem is observed as falling below `1.5Gi`,
or if the free inodes on the node's primary filesystem is less than 10,
or if available disk space on the node's image filesystem is observed as falling below `20Gi`,
or if the free inodes on the node's image filesystem is less than 100,
it will record when that signal was observed internally in a cache. If at the next
sync, that criterion was no longer satisfied, the cache is cleared for that
signal. If that signal is observed as being satisfied for longer than the