更新 kubernetes-MD/kubernetes调度粘性.md
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<h1><center>kubernetes调度粘性</center></h1>
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著作:行癫 <盗版必究>
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------
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## 一:调度粘性
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#### 1.三种调度粘性
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NodeSelector(定向调度)
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NodeAffinity(Node亲和性)
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PodAffinity(Pod亲和性)
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通常情况下,使用的都是k8s默认的调度调度方式,但是在有些情况下,我们需要将pod运行在具有特点的标签的node上才能都运行,这个时候,pod的调度策略就不能使用k8s默认的调度策略了,这个时候,就需要指定调度策略,告诉k8s需要将pod调度到那些node上。
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#### 2.nodeSelector
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常规情况下,会直接使用nodeSelector这种调度策略。labels(标签) 是k8s里面用来编标记资源的一种常用的方式,我们可以给node标记特殊的标签,然后nodeSelector会将pod调度到带有指定labels的node上的;提供简单的pod部署限制,pod选择一个或多个node的label部署
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给node添加label:
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```shell
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kubectl label nodes <node-name> <label-key>=<label-value>
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```
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pod添加nodeSelector机制:
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```shell
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx
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labels:
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env: test
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spec:
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containers:
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- name: nginx
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image: nginx
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imagePullPolicy: IfNotPresent
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nodeSelector:
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disktype: ssd
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```
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部署pod:
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```shell
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[root@master ~]# kubectl create -f test.yaml
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pod/nginx created
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```
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查看结果:
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```shell
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[root@master ~]# kubectl get pod -A -o wide
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NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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default nginx 0/1 ContainerCreating 0 37s <none> node-1 <none>
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```
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从上面的执行结果可以看出,pod 通过默认的 default-scheduler 调度器到了node-1节点上。不过,这种调度方式属于强制性的。如果node02上的资源不足,那么pod的状态将会一直是pending状态。
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#### 3.亲和性和反亲和性调度
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k8s的默认调度流程实际上是经过了两个阶段predicates(判断),priorities(优先选择) 。使用默认的调度流程的话,k8s会将pod调度到资源充裕的节点上,使用nodeselector的调度方法,又会将pod调度具有指定标签的节点上。然后在实际生产环境中,我们需要将pod调度到具有些label的一组node才能满足实际需求,这个时候就需要nodeAffinity、podAffinity以及 podAntiAffinity(pod 反亲和性)
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亲和性可以分为具体可以细分为硬和软两种亲和性:
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软亲和性:如果调度的时候,没有满足要求,也可以继续调度,即能满足最好,不能也无所谓
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硬亲和性:是指调度的时候必须满足特定的要求,如果不满足,那么pod将不会被调度到当前node
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requiredDuringSchedulingIgnoredDuringExecution #硬性强制
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preferredDuringSchedulingIgnoredDuringExecution #软性配置
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#### 4.nodeAffinity 节点亲和性
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节点亲和性主要是用来控制 pod 能部署在哪些节点上,以及不能部署在哪些节点上的;它可以进行一些简单的逻辑组合了,不只是简单的相等匹配(preferredDuringSchedulingIgnoredDuringExecution)
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强调优先满足制定规则,调度器会尝试调度pod到Node上,但并不强求,相当于软限制。多个优先级规则还可以设置权重值,以定义执行的先后顺序
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nodeAffinity控制 pod 的调度:
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```shell
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apiVersion: v1
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kind: Pod
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metadata:
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name: with-node-affinity
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spec:
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affinity:
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nodeAffinity:
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requiredDuringSchedulingIgnoredDuringExecution:
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nodeSelectorTerms:
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- matchExpressions:
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- key: beta.kubernetes.io/arch
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operator: In
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values:
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- amd64
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preferredDuringSchedulingIgnoredDuringExecution:
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- weight: 1
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preference:
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matchExpressions:
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- key: disk-type
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operator: In
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values:
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- ssd
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containers:
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- name: with-node-affinity
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image: nginx
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```
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设置label:
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```shell
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[root@master ~]# kubectl label nodes node-2 disk-type=ssd
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node/node-2 labeled
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```
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创建pod并查看运行结果:
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```shell
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[root@master yaml]# kubectl get pod -o wide
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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with-node-affinity 0/1 ContainerCreating 0 4m <none> node-2 <none> <none>
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```
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NodeAffinity规则设置的注意事项如下:
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如果同时定义了nodeSelector和nodeAffinity,name必须两个条件都得到满足,pod才能最终运行在指定的node上
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如果nodeAffinity指定了多个nodeSelectorTerms,那么其中一个能够匹配成功即可
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如果在nodeSelectorTerms中有多个matchExpressions,则一个节点必须满足所有matchExpressions才能运行该pod
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matchExpressions : 匹配表达式,这个标签可以指定一段,例如pod中定义的key为zone,operator为In(包含那些),values为 foo和bar;就是在node节点中包含foo和bar的标签中调度
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kubernetes提供的操作符有下面的几种:
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In:label 的值在某个标签中
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NotIn:label 的值不在某个标签中
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Gt:label 的值大于某个值
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Lt:label 的值小于某个值
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Exists:某个 label 存在
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DoesNotExist:某个 label 不存在
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#### 5.podAffinity pod亲和性
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Pod的亲和性主要用来解决pod可以和哪些pod部署在同一个集群里面,即拓扑域(由node组成的集群)里面;而pod的反亲和性是为了解决pod不能和哪些pod部署在一起的问题,二者都是为了解决pod之间部署问题。需要注意的是,Pod 间亲和与反亲和需要大量的处理,这可能会显著减慢大规模集群中的调度,不建议在具有几百个节点的集群中使用,而且Pod 反亲和需要对节点进行一致的标记,即集群中的每个节点必须具有适当的标签能够匹配topologyKey。如果某些或所有节点缺少指定的topologyKey标签,可能会导致意外行为
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Pod亲和性场景,我们的k8s集群的节点分布在不同的区域或者不同的机房,当服务A和服务B要求部署在同一个区域或者同一机房的时候,我们就需要亲和性调度了
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labelSelector : 选择跟那组Pod亲和
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namespaces : 选择哪个命名空间
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topologyKey : 指定节点上的哪个键
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pod亲和性调度需要各个相关的pod对象运行于"同一位置", 而反亲和性调度则要求他们不能运行于"同一位置"
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这里指定“同一位置” 是通过 topologyKey 来定义的,topologyKey 对应的值是 node 上的一个标签名称,比如各别节点zone=A标签,各别节点有zone=B标签,pod affinity topologyKey定义为zone,那么调度pod的时候就会围绕着A拓扑,B拓扑来调度,而相同拓扑下的node就为“同一位置”;如果基于各个节点kubernetes.io/hostname标签作为评判标准,那么很明显“同一位置”意味着同一节点,不同节点既为不同位置
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pod亲和性:
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```shell
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apiVersion: v1
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kind: Pod
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metadata:
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name: pod-first
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labels:
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app: myapp
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tier: frontend
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spec:
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containers:
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- name: myapp
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image: daocloud.io/library/nginx:latest
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: pod-second
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labels:
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app: db
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tier: db
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spec:
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containers:
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- name: busybox
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image: daocloud.io/library/busybox
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imagePullPolicy: IfNotPresent
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command: ["sh","-c","sleep 3600"]
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affinity:
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podAffinity:
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requiredDuringSchedulingIgnoredDuringExecution:
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- labelSelector:
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matchExpressions:
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- {key: app, operator: In, values: ["myapp"]}
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topologyKey: kubernetes.io/hostname
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```
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查看结果:
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```shell
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[root@master yaml]# kubectl get pod -o wide
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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pod-first 1/1 Running 0 10m 10.244.1.6 node-1 <none> <none>
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pod-second 1/1 Running 0 10m 10.244.1.7 node-1 <none> <none>
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```
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pod反亲和性:
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Pod反亲和性场景,当应用服务A和数据库服务B要求尽量不要在同一台节点上的时候
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```shell
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apiVersion: v1
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kind: Pod
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metadata:
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name: pod-first-1
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labels:
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app: myapp
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tier: frontend
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spec:
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containers:
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- name: myapp
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image: daocloud.io/library/nginx:latest
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: pod-second-2
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labels:
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app: backend
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tier: db
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spec:
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containers:
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- name: busybox
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image: daocloud.io/library/busybox:latest
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imagePullPolicy: IfNotPresent
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command: ["sh","-c","sleep 3600"]
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affinity:
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podAntiAffinity:
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requiredDuringSchedulingIgnoredDuringExecution:
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- labelSelector:
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matchExpressions:
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- {key: app, operator: In, values: ["myapp"]}
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topologyKey: kubernetes.io/hostname
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```
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查看结果:
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```shell
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[root@master yaml]# kubectl get pod -o wide
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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pod-first-1 1/1 Running 0 7m28s 10.244.1.8 node-1 <none> <none>
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pod-second-2 1/1 Running 0 7m28s 10.244.2.6 node-2 <none> <none>
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```
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<h1><center>kubernetes调度粘性</center></h1>
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------
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## 一:调度粘性
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#### 1.三种调度粘性
|
||||
|
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NodeSelector(定向调度)
|
||||
|
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NodeAffinity(Node亲和性)
|
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|
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PodAffinity(Pod亲和性)
|
||||
|
||||
通常情况下,使用的都是k8s默认的调度调度方式,但是在有些情况下,我们需要将pod运行在具有特点的标签的node上才能都运行,这个时候,pod的调度策略就不能使用k8s默认的调度策略了,这个时候,就需要指定调度策略,告诉k8s需要将pod调度到那些node上。
|
||||
|
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#### 2.nodeSelector
|
||||
|
||||
常规情况下,会直接使用nodeSelector这种调度策略。labels(标签) 是k8s里面用来编标记资源的一种常用的方式,我们可以给node标记特殊的标签,然后nodeSelector会将pod调度到带有指定labels的node上的;提供简单的pod部署限制,pod选择一个或多个node的label部署
|
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|
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给node添加label:
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```shell
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kubectl label nodes <node-name> <label-key>=<label-value>
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```
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pod添加nodeSelector机制:
|
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|
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```shell
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx
|
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labels:
|
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env: test
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spec:
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containers:
|
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- name: nginx
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image: nginx
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imagePullPolicy: IfNotPresent
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nodeSelector:
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disktype: ssd
|
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```
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部署pod:
|
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|
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```shell
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[root@master ~]# kubectl create -f test.yaml
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pod/nginx created
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```
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查看结果:
|
||||
|
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```shell
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[root@master ~]# kubectl get pod -A -o wide
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NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
|
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default nginx 0/1 ContainerCreating 0 37s <none> node-1 <none>
|
||||
```
|
||||
|
||||
从上面的执行结果可以看出,pod 通过默认的 default-scheduler 调度器到了node-1节点上。不过,这种调度方式属于强制性的。如果node02上的资源不足,那么pod的状态将会一直是pending状态。
|
||||
|
||||
#### 3.亲和性和反亲和性调度
|
||||
|
||||
k8s的默认调度流程实际上是经过了两个阶段predicates(判断),priorities(优先选择) 。使用默认的调度流程的话,k8s会将pod调度到资源充裕的节点上,使用nodeselector的调度方法,又会将pod调度具有指定标签的节点上。然后在实际生产环境中,我们需要将pod调度到具有些label的一组node才能满足实际需求,这个时候就需要nodeAffinity、podAffinity以及 podAntiAffinity(pod 反亲和性)
|
||||
|
||||
亲和性可以分为具体可以细分为硬和软两种亲和性:
|
||||
|
||||
软亲和性:如果调度的时候,没有满足要求,也可以继续调度,即能满足最好,不能也无所谓
|
||||
|
||||
硬亲和性:是指调度的时候必须满足特定的要求,如果不满足,那么pod将不会被调度到当前node
|
||||
|
||||
requiredDuringSchedulingIgnoredDuringExecution #硬性强制
|
||||
|
||||
preferredDuringSchedulingIgnoredDuringExecution #软性配置
|
||||
|
||||
#### 4.nodeAffinity 节点亲和性
|
||||
|
||||
节点亲和性主要是用来控制 pod 能部署在哪些节点上,以及不能部署在哪些节点上的;它可以进行一些简单的逻辑组合了,不只是简单的相等匹配(preferredDuringSchedulingIgnoredDuringExecution)
|
||||
|
||||
强调优先满足制定规则,调度器会尝试调度pod到Node上,但并不强求,相当于软限制。多个优先级规则还可以设置权重值,以定义执行的先后顺序
|
||||
|
||||
nodeAffinity控制 pod 的调度:
|
||||
|
||||
```shell
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: with-node-affinity
|
||||
spec:
|
||||
affinity:
|
||||
nodeAffinity:
|
||||
requiredDuringSchedulingIgnoredDuringExecution:
|
||||
nodeSelectorTerms:
|
||||
- matchExpressions:
|
||||
- key: beta.kubernetes.io/arch
|
||||
operator: In
|
||||
values:
|
||||
- amd64
|
||||
preferredDuringSchedulingIgnoredDuringExecution:
|
||||
- weight: 1
|
||||
preference:
|
||||
matchExpressions:
|
||||
- key: disk-type
|
||||
operator: In
|
||||
values:
|
||||
- ssd
|
||||
containers:
|
||||
- name: with-node-affinity
|
||||
image: nginx
|
||||
```
|
||||
|
||||
设置label:
|
||||
|
||||
```shell
|
||||
[root@master ~]# kubectl label nodes node-2 disk-type=ssd
|
||||
node/node-2 labeled
|
||||
```
|
||||
|
||||
创建pod并查看运行结果:
|
||||
|
||||
```shell
|
||||
[root@master yaml]# kubectl get pod -o wide
|
||||
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
|
||||
with-node-affinity 0/1 ContainerCreating 0 4m <none> node-2 <none> <none>
|
||||
```
|
||||
|
||||
NodeAffinity规则设置的注意事项如下:
|
||||
|
||||
如果同时定义了nodeSelector和nodeAffinity,name必须两个条件都得到满足,pod才能最终运行在指定的node上
|
||||
|
||||
如果nodeAffinity指定了多个nodeSelectorTerms,那么其中一个能够匹配成功即可
|
||||
|
||||
如果在nodeSelectorTerms中有多个matchExpressions,则一个节点必须满足所有matchExpressions才能运行该pod
|
||||
|
||||
matchExpressions : 匹配表达式,这个标签可以指定一段,例如pod中定义的key为zone,operator为In(包含那些),values为 foo和bar;就是在node节点中包含foo和bar的标签中调度
|
||||
|
||||
kubernetes提供的操作符有下面的几种:
|
||||
|
||||
In:label 的值在某个标签中
|
||||
|
||||
NotIn:label 的值不在某个标签中
|
||||
|
||||
Gt:label 的值大于某个值
|
||||
|
||||
Lt:label 的值小于某个值
|
||||
|
||||
Exists:某个 label 存在
|
||||
|
||||
DoesNotExist:某个 label 不存在
|
||||
|
||||
#### 5.podAffinity pod亲和性
|
||||
|
||||
Pod的亲和性主要用来解决pod可以和哪些pod部署在同一个集群里面,即拓扑域(由node组成的集群)里面;而pod的反亲和性是为了解决pod不能和哪些pod部署在一起的问题,二者都是为了解决pod之间部署问题。需要注意的是,Pod 间亲和与反亲和需要大量的处理,这可能会显著减慢大规模集群中的调度,不建议在具有几百个节点的集群中使用,而且Pod 反亲和需要对节点进行一致的标记,即集群中的每个节点必须具有适当的标签能够匹配topologyKey。如果某些或所有节点缺少指定的topologyKey标签,可能会导致意外行为
|
||||
|
||||
Pod亲和性场景,我们的k8s集群的节点分布在不同的区域或者不同的机房,当服务A和服务B要求部署在同一个区域或者同一机房的时候,我们就需要亲和性调度了
|
||||
|
||||
labelSelector : 选择跟那组Pod亲和
|
||||
|
||||
namespaces : 选择哪个命名空间
|
||||
|
||||
topologyKey : 指定节点上的哪个键
|
||||
|
||||
pod亲和性调度需要各个相关的pod对象运行于"同一位置", 而反亲和性调度则要求他们不能运行于"同一位置"
|
||||
|
||||
这里指定“同一位置” 是通过 topologyKey 来定义的,topologyKey 对应的值是 node 上的一个标签名称,比如各别节点zone=A标签,各别节点有zone=B标签,pod affinity topologyKey定义为zone,那么调度pod的时候就会围绕着A拓扑,B拓扑来调度,而相同拓扑下的node就为“同一位置”;如果基于各个节点kubernetes.io/hostname标签作为评判标准,那么很明显“同一位置”意味着同一节点,不同节点既为不同位置
|
||||
|
||||
pod亲和性:
|
||||
|
||||
```shell
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: pod-first
|
||||
labels:
|
||||
app: myapp
|
||||
tier: frontend
|
||||
spec:
|
||||
containers:
|
||||
- name: myapp
|
||||
image: daocloud.io/library/nginx:latest
|
||||
---
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: pod-second
|
||||
labels:
|
||||
app: db
|
||||
tier: db
|
||||
spec:
|
||||
containers:
|
||||
- name: busybox
|
||||
image: daocloud.io/library/busybox
|
||||
imagePullPolicy: IfNotPresent
|
||||
command: ["sh","-c","sleep 3600"]
|
||||
affinity:
|
||||
podAffinity:
|
||||
requiredDuringSchedulingIgnoredDuringExecution:
|
||||
- labelSelector:
|
||||
matchExpressions:
|
||||
- {key: app, operator: In, values: ["myapp"]}
|
||||
topologyKey: kubernetes.io/hostname
|
||||
```
|
||||
|
||||
查看结果:
|
||||
|
||||
```shell
|
||||
[root@master yaml]# kubectl get pod -o wide
|
||||
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
|
||||
pod-first 1/1 Running 0 10m 10.244.1.6 node-1 <none> <none>
|
||||
pod-second 1/1 Running 0 10m 10.244.1.7 node-1 <none> <none>
|
||||
```
|
||||
|
||||
pod反亲和性:
|
||||
|
||||
Pod反亲和性场景,当应用服务A和数据库服务B要求尽量不要在同一台节点上的时候
|
||||
|
||||
```shell
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: pod-first-1
|
||||
labels:
|
||||
app: myapp
|
||||
tier: frontend
|
||||
spec:
|
||||
containers:
|
||||
- name: myapp
|
||||
image: daocloud.io/library/nginx:latest
|
||||
---
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: pod-second-2
|
||||
labels:
|
||||
app: backend
|
||||
tier: db
|
||||
spec:
|
||||
containers:
|
||||
- name: busybox
|
||||
image: daocloud.io/library/busybox:latest
|
||||
imagePullPolicy: IfNotPresent
|
||||
command: ["sh","-c","sleep 3600"]
|
||||
affinity:
|
||||
podAntiAffinity:
|
||||
requiredDuringSchedulingIgnoredDuringExecution:
|
||||
- labelSelector:
|
||||
matchExpressions:
|
||||
- {key: app, operator: In, values: ["myapp"]}
|
||||
topologyKey: kubernetes.io/hostname
|
||||
```
|
||||
|
||||
查看结果:
|
||||
|
||||
```shell
|
||||
[root@master yaml]# kubectl get pod -o wide
|
||||
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
|
||||
pod-first-1 1/1 Running 0 7m28s 10.244.1.8 node-1 <none> <none>
|
||||
pod-second-2 1/1 Running 0 7m28s 10.244.2.6 node-2 <none> <none>
|
||||
```
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
|
Loading…
Reference in New Issue