49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
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# Node
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## Node维护模式
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```
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kubectl drain NODE [Options]
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```
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- 它会删除该NODE上由ReplicationController, ReplicaSet, DaemonSet, StatefulSet or Job创建的Pod
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- 不删除mirror pods（因为不可通过API删除mirror pods）
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- 如果还有其它类型的Pod（比如不通过RC而直接通过kubectl create的Pod）并且没有--force选项，该命令会直接失败
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- 如果命令中增加了--force选项，则会强制删除这些不是通过ReplicationController, Job或者DaemonSet创建的Pod
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有的时候不需要evict pod，只需要标记Node不可调用，可以用`kubectl cordon`命令。
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恢复的话只需要运行`kubectl uncordon NODE`将NODE重新改成可调度状态。
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## Taint tolerant
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// taint节点，阻止新的pod上来
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kubectl taint nodes node08 dedicated=maintaining:NoSchedule
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// label节点，只允许指定的pod上来
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kubectl label nodes node08 hyper/nodetype=maintaining
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// 然后在Pod定义中加入如下annotation：
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```
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annotations:
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scheduler.alpha.kubernetes.io/tolerations: '[{"key":"dedicated", "value":"maintaining"}]'
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scheduler.alpha.kubernetes.io/affinity: >
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{
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"nodeAffinity": {
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"requiredDuringSchedulingIgnoredDuringExecution": {
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"nodeSelectorTerms": [
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{
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"matchExpressions": [
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{
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"key": "hyper/nodetype",
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"operator": "In",
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"values": ["maintaining"]
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}
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]
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}
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]
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}
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}
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}
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```
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