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5-资源限制，亲和反亲和，污点和容忍

时间：2022-12-29 11:46:13浏览次数：68  
标签：容忍 name tomcat app2 app magedu selector 反亲 污点

一 Kubernetes Container、Pod、Namespace内存及CPU限制

1.1 限制单位介绍

1 如果运行的容器没有定义资源（memory,cpu）等限制，但是在namesapce定义了LimitRange限制，那么该容器会继承LimitRange中的默认限制
2 如果namespace没有定义LimitRange限制，那么该容器可以只要宿主机的最大可用资源，直到无资源可以而触发主机（OOM killer）.

cpu以核心为单位进行限制，单位可以是整核，浮点核心数或毫核（m/milli）
2=2核心=200%  0.5=500m=50%   1.2=1200m=120%

meemory以字节为单位，单位可以是E,P,T,G,M,K,Ei,Pi,Ti,Gi,Mi,Ki
1536Mi=1.5Gi

request(请求)为kubernetes scheduler执行pod调度时node节点至少需要拥有的资源
limit（限制）为pod运行成功后最多可以使用的资源上限。
两者之间的关系
0 <= request <= limit  0是不限制

1.2 不同应用设置不同的资源限制（参考）

nginx #静态服务器 
        2C/2G
        1C/1G
java #动态服务 
    2C/2G
    2c/4G
    
php  2C/2G

go/python  1C/2G 1C/1G 
job/cronjob 0.3/512Mi
elastisearch  4C/12G 
mysql          4C/8G

1.3 单个pod的cpu和内存的限制

1.3.1 只针对内存限制，内存最多用256M,CPU无限制

cat case1-pod-memory-limit.yml 

apiVersion: apps/v1
kind: Deployment
metadata:
  name: limit-test-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels: #rs or deployment
      app: limit-test-pod
#    matchExpressions:
#      - {key: app, operator: In, values: [ng-deploy-80,ng-rs-81]}
  template:
    metadata:
      labels:
        app: limit-test-pod
    spec:
      containers:
      - name: limit-test-container
        image: lorel/docker-stress-ng   #压测镜像
        resources:
          limits:
            memory: "256Mi"
          requests:
            memory: "100Mi"
        #command: ["stress"]
        args: ["--vm", "2", "--vm-bytes", "256M"]

查看具体使用的资源
image

1.3.2 针对内存和cpu都做上限制,cpu最多用1.3核，内存最多512

cat case2-pod-memory-and-cpu-limit.yml 
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
kind: Deployment
metadata:
  name: limit-test-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels: #rs or deployment
      app: limit-test-pod
#    matchExpressions:
#      - {key: app, operator: In, values: [ng-deploy-80,ng-rs-81]}
  template:
    metadata:
      labels:
        app: limit-test-pod
    spec:
      containers:
      - name: limit-test-container
        image: lorel/docker-stress-ng
        resources:
          limits:
            cpu: "1.3"
            memory: "512Mi"
          requests:
            memory: "100Mi"
            cpu: "500m"
        #command: ["stress"]
        args: ["--vm", "2", "--vm-bytes", "256M"]
      #nodeSelector:
      #  env: group1

查看资源使用情况
image

1.4 limitrange的限制

主要针对指定命名空间内所有的pod生效，内容如下

apiVersion: v1
kind: LimitRange
metadata:
  name: limitrange-magedu
  namespace: magedu
spec:
  limits:
  - type: Container       #限制的资源类型
    max:
      cpu: "2"            #限制单个容器的最大CPU
      memory: "2Gi"       #限制单个容器的最大内存
    min:
      cpu: "500m"         #限制单个容器的最小CPU
      memory: "512Mi"     #限制单个容器的最小内存
    default:
      cpu: "500m"         #默认单个容器的CPU限制
      memory: "512Mi"     #默认单个容器的内存限制
    defaultRequest:
      cpu: "500m"         #默认单个容器的CPU创建请求
      memory: "512Mi"     #默认单个容器的内存创建请求
    maxLimitRequestRatio:
      cpu: 2              #限制CPU limit/request比值最大为2  
      memory: 2         #限制内存limit/request比值最大为1.5
  - type: Pod
    max:
      cpu: "4"            #限制单个Pod的最大CPU
      memory: "4Gi"       #限制单个Pod最大内存
  - type: PersistentVolumeClaim
    max:
      storage: 50Gi        #限制PVC最大的requests.storage
    min:
      storage: 30Gi        #限制PVC最小的requests.storage

查看具体限制的详情

kubectl get limitranges -n magedu
kubectl describe limitranges limitrange-magedu -n magedu

image

然后我们尝试在这个命名空间内创建pod，资源使用必须遵循里面的定义，否则无法创建

1.4.1 遵循里面的规则，去创建

[root@k8s-master1 magedu-limit-case]# cat case4-pod-RequestRatio-limit.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-wordpress-deployment-label
  name: magedu-wordpress-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-wordpress-selector
  template:
    metadata:
      labels:
        app: magedu-wordpress-selector
    spec:
      containers:
      - name: magedu-wordpress-nginx-container
        image: nginx:1.16.1
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 1
            memory: 1Gi
          requests:
            cpu: 0.5
            memory: 512Mi

      - name: magedu-wordpress-php-container
        image: php:5.6-fpm-alpine 
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 1
            #cpu: 2
            memory: 1Gi
          requests:
            cpu: 1
            memory: 512Mi

1.4.2 不遵守里面的资源限制去创建pod，不满足里面的Max Limit/Request Ratio的比例限制

[root@k8s-master1 magedu-limit-case]# cat case4-pod-RequestRatio-limit.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-wordpress-deployment-label
  name: magedu-wordpress-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-wordpress-selector
  template:
    metadata:
      labels:
        app: magedu-wordpress-selector
    spec:
      containers:
      - name: magedu-wordpress-nginx-container
        image: nginx:1.16.1
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 1
            memory: 2Gi
          requests:
            cpu: 0.5
            memory: 512Mi

      - name: magedu-wordpress-php-container
        image: php:5.6-fpm-alpine 
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 1
            #cpu: 2
            memory: 2Gi
          requests:
            cpu: 1
            memory: 512Mi

当你apply 的时候，你会发现通过get pod根本看不到这个pod,是因为超出了limitrange的资源限制
如果想查看这个pod具体是什么问题，可以通过下面的命令去查看

 kubectl get deployments.apps  -n magedu
 kubectl get deployments.apps magedu-wordpress-deployment -n magedu -o json

报错如下，内存不满足里面定义的，requests和limit针对内存最大差额为2倍，但是你的已经是4倍了，所以无法创建
image

1.5 针对整个namespace做资源限制-ResourceQuota

https://kubernetes.io/zh/docs/concepts/policy/resource-quotas/
针对一个namespace去做资源限制，这里面的的cpu和内存，就是把所有node节点的cpu和内存加起来的数量

限制设置如下：

[root@k8s-master1 magedu-limit-case]# cat case6-ResourceQuota-magedu.yaml
apiVersion: v1
kind: ResourceQuota
metadata:
  name: quota-magedu
  namespace: magedu
spec:
  hard:
    requests.cpu: "8"
    limits.cpu: "8"
    requests.memory: 4Gi
    limits.memory: 4Gi
    requests.nvidia.com/gpu: 4
    pods: "20"   #限制pod数量
    services: "6" #限制services数量

查看resourcequotas

kubectl get resourcequotas -n magedu

image

kubectl describe resourcequotas quota-magedu -n magedu

image

1.5.1 示例1-满足里面的内存限制

创建3个pod，内存共3g,cpu1.5,满足条件

root@k8s-master1 magedu-limit-case]# cat case8-namespace-cpu-limit-test.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-nginx-deployment-label
  name: magedu-nginx-deployment
  namespace: magedu
spec:
  replicas: 3
  selector:
    matchLabels:
      app: magedu-nginx-selector
  template:
    metadata:
      labels:
        app: magedu-nginx-selector
    spec:
      containers:
      - name: magedu-nginx-container
        image: nginx:1.16.1
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 0.5
            memory: 1Gi
          requests:
            cpu: 0.5
            memory: 512Mi

1.5.2 示例2 -演示副本数为5，总内存超出限制，只能创建4个pod

[root@k8s-master1 magedu-limit-case]# cat case8-namespace-cpu-limit-test.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-nginx-deployment-label
  name: magedu-nginx-deployment
  namespace: magedu
spec:
  replicas: 5
  selector:
    matchLabels:
      app: magedu-nginx-selector
  template:
    metadata:
      labels:
        app: magedu-nginx-selector
    spec:
      containers:
      - name: magedu-nginx-container
        image: nginx:1.16.1
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 0.2
            memory: 1Gi
          requests:
            cpu: 0.2
            memory: 512Mi

image

提示信息如下：

kubectl get deployments magedu-nginx-deployment  -n magedu -o json

image

二 nodeSelector、nodeName、node亲和与反亲和、pod亲和与反亲和、污点与容忍、驱逐

2.1 关于标签设置

# 打标签
kubectl  label  node  172.31.7.112 disktype=ssd
kubectl  label  node  172.31.7.112  project=magedu
#删除标签
kubectl  label  node  172.31.7.112 disktype-  
#查看标签
kubectl  get nodes --show-labels=true
kubectl  get pod --show-labels
kubectl describe node 172.31.7.110

2.2 nodeselector-节点标签

下面这个pod，必须选择disktype=hdd类型的，否则会不调度，如果不匹配，会有如下提示
image

[root@k8s-master1 Affinit-case]# cat case1-nodeSelector.yaml 
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine 
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 1
            memory: "512Mi"
          requests:
            cpu: 500m
            memory: "512Mi"
      nodeSelector:
        project: magedu
        disktype: hdd

2.3 nodename-节点名字

这个相对来说用的比较少,下面这个pod必须要调度到 nodeName: 172.31.7.122这个节点

[root@k8s-master1 Affinit-case]# cat case2-nodename.yaml 
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      nodeName: 172.31.7.122
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine 
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 1
            memory: "512Mi"
          requests:
            cpu: 500m
            memory: "512Mi"

2.4 node节点亲和和反亲和

image

2.4.1 硬亲和

多个matchexpressions 只满足其中一个key 就可以，
image

2.4.1.1 多个matchexpressions演示

[root@k8s-master1 Affinit-case]# cat case3-1.1-nodeAffinity-requiredDuring-matchExpressions.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions: #匹配条件1,多个values可以调度
              - key: disktype
                operator: In
                values:
                - hdd # 只有一个value是匹配成功也可以调度
                - xxx
            - matchExpressions: #匹配条件2,多个matchExpressions加上以及每个matchExpressions values只有其中一个value匹配成功就可以调度
              - key: project
                operator: In
                values:
                - mmm #即使这俩条件2的都匹配不上也可以调度
                - nnn

2.4.1.2 一个matchExpresions 多个key ,必须两个key 都要满足才可以

如下所示
image
下面这个实例是一个matchExpresions 多个key，两个key必须都要满足，才可以调度

[root@k8s-master1 Affinit-case]# cat case3-1.2-nodeAffinity-requiredDuring-matchExpressions.yaml 
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions: #硬亲和匹配条件1
              - key: disktype
                operator: In
                values:
                - ssd
                - xxx #同个key的多个value只有有一个匹配成功就行
              - key: project #硬亲和条件1和条件2必须同时满足,否则不调度
                operator: In
                values:
                - magedu

2.4.2 软亲和

image
实例演示
优先匹配权重为80的条件，就是project是magedu的，即使两个条件都不满足，pod最终也会调度到其他节点上，这是软亲和的特点。

[root@k8s-master1 Affinit-case]# cat case3-2.1-nodeAffinity-preferredDuring.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 80 
            preference: 
              matchExpressions: 
              - key: project 
                operator: In 
                values: 
                  - mageduxx
          - weight: 60 
            preference: 
              matchExpressions: 
              - key: disktype
                operator: In 
                values: 
                  - hddxx

2.4.3 软亲和和硬亲和结合使用

image

实例演示

[root@k8s-master1 Affinit-case]# cat case3-2.2-nodeAffinity-requiredDuring-preferredDuring.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution: #硬亲和
            nodeSelectorTerms:
            - matchExpressions: #硬匹配条件1
              - key: "kubernetes.io/role" 
                operator: NotIn
                values:
                - "master" #硬性匹配key 的值kubernetes.io/role不包含master的节点,即绝对不会调度到master节点(node反亲和)
          preferredDuringSchedulingIgnoredDuringExecution: #软亲和
          - weight: 80 
            preference: 
              matchExpressions: 
              - key: project 
                operator: In 
                values: 
                  - magedu
          - weight: 60 
            preference: 
              matchExpressions: 
              - key: disktype
                operator: In 
                values: 
                  - ssd

2.4.4 反亲和

image
实例演示

[root@k8s-master1 Affinit-case]# cat case3-3.1-nodeantiaffinity.yaml 
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions: #匹配条件1
              - key: disktype
                operator: NotIn #调度的目的节点没有key为disktype且值为hdd的标签
                values:
                - hdd #绝对不会调度到含有label的key为disktype且值为hdd的hdd的节点,即会调度到没有key为disktype且值为hdd的hdd的节点

2.5 pod的亲和和反亲和-pod Affinity antiaffinity

image

2.5.1 软亲和

实例演示-我想让nginx和tomcat调度到同一台node节点
nginx.yaml

[root@k8s-master1 Affinit-case]# cat case4-4.1-nginx.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: python-nginx-deployment-label
  name: python-nginx-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: python-nginx-selector
  template:
    metadata:
      labels:
        app: python-nginx-selector
        project: python
    spec:
      containers:
      - name: python-nginx-container
        image: nginx:1.20.2-alpine
        #command: ["/apps/tomcat/bin/run_tomcat.sh"]
        #imagePullPolicy: IfNotPresent
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        - containerPort: 443
          protocol: TCP
          name: https
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
#        resources:
#          limits:
#            cpu: 2
#            memory: 2Gi
#          requests:
#            cpu: 500m
#            memory: 1Gi


---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: python-nginx-service-label
  name: python-nginx-service
  namespace: magedu
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30014
  - name: https
    port: 443
    protocol: TCP
    targetPort: 443
    nodePort: 30453
  selector:
    app: python-nginx-selector
    project: python #一个或多个selector，至少能匹配目标pod的一个标签

tomcal.yaml

[root@k8s-master1 Affinit-case]# cat case4-4.2-podaffinity-preferredDuring.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        podAffinity:
          #requiredDuringSchedulingIgnoredDuringExecution:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: project 
                  operator: In
                  values:
                    - python
              topologyKey: kubernetes.io/hostname 
              namespaces: 
                - magedu

验证pod调度结果

kubectl get pod -n magedu -o wide

image

2.5.2 硬亲和

image

实例
nginx.yaml见上一个

[root@k8s-master1 Affinit-case]# cat case4-4.3-podaffinity-requiredDuring.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 3
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        podAffinity: #pod亲和
          requiredDuringSchedulingIgnoredDuringExecution: 
          - labelSelector:
              matchExpressions:
              - key: project
                operator: In
                values:
                  - python
            topologyKey: "kubernetes.io/hostname"
            namespaces:
              - magedu

2.5.3 反亲和

2.5.3.1 硬反亲和

image

[root@k8s-master1 Affinit-case]# cat  case4-4.4-podAntiAffinity-requiredDuring.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        podAntiAffinity: #pod反亲和
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: project
                operator: In
                values:
                  - python
            topologyKey: "kubernetes.io/hostname"
            namespaces:
              - magedu

2.5.3.2 软反亲和

image

[root@k8s-master1 Affinit-case]# cat case4-4.5-podAntiAffinity-preferredDuring.yaml
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app2-deployment-label
  name: magedu-tomcat-app2-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-tomcat-app2-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app2-selector
    spec:
      containers:
      - name: magedu-tomcat-app2-container
        image: tomcat:7.0.94-alpine
        imagePullPolicy: IfNotPresent
        #imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
      affinity:
        podAntiAffinity: #反亲和
          preferredDuringSchedulingIgnoredDuringExecution: #软反亲和
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: project 
                  operator: In
                  values:
                    - python
              topologyKey: kubernetes.io/hostname 
              namespaces: 
                - magedu

2.6 亲和和反亲和总结

硬亲和-绝对会在一起
硬反亲和-绝对不会在一起
软亲和-能在一起一起就在一起
软反亲和-能不在一起就不在一起，如果匹配失败也会在一起

2.7 污点和容忍

https://kubernetes.io/zh/docs/concepts/scheduling-eviction/taint-and-toleration/
污点就是不参与调度，容忍就是即使有污点了，也会调度
污点和容忍：通过污点拒绝大部分，通过容忍允许小部分pod

image

2.7.1 设置污点

kubectl taint nodes 172.31.7.111  key1=value1:NoExecute #不会打标签但是会配置污点，并立即驱逐pod
kubectl taint nodes 172.31.7.122  key1=value1:NoSchedule #不参与调度，默认master都有这个污点类型

2.7.2 设置容忍

image

[root@k8s-master1 Affinit-case]# cat case5.1-taint-tolerations.yaml 
kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-tomcat-app1-deployment-label
  name: magedu-tomcat-app1-deployment
  namespace: magedu
spec:
  replicas: 3
  selector:
    matchLabels:
      app: magedu-tomcat-app1-selector
  template:
    metadata:
      labels:
        app: magedu-tomcat-app1-selector
    spec:
      containers:
      - name: magedu-tomcat-app1-container
        #image: harbor.magedu.local/magedu/tomcat-app1:v7
        image: tomcat:7.0.93-alpine 
        #command: ["/apps/tomcat/bin/run_tomcat.sh"]
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
#        env:
#        - name: "password"
#          value: "123456"
#        - name: "age"
#          value: "18"
#        resources:
#          limits:
#            cpu: 1
#            memory: "512Mi"
#          requests:
#            cpu: 500m
#            memory: "512Mi"

      tolerations: 
      - key: "key1"
        operator: "Equal"
        value: "value1"
        effect: "NoSchedule"

---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: magedu-tomcat-app1-service-label
  name: magedu-tomcat-app1-service
  namespace: magedu
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8080
    #nodePort: 40003
  selector:
    app: magedu-tomcat-app1-selector

2.7.3 取消污点

kubectl taint nodes 172.31.7.122 key1:NoSchedule-

2.8 驱逐pod

2.8.1 手动驱逐pod


# 第一种
kubectl taint nodes 172.31.7.111  key1=value1:NoExecute  #不会打标签，但是会立即驱逐pod

# 第二种
kubectl  drain  172.31.7.111  --ignore-daemonsets #驱逐pod并打SchedulingDisabled标签

然后delete node
关机
下线

2.8.2 k8s节点压力驱逐

https://kubernetes.io/zh/docs/concepts/scheduling-eviction/node-pressure-eviction/
这个配置是默认就有的，不需要人为配置。
image

image
node节点可用内存小于100M就会驱逐
这些是在kubelet下面配置的 /var/lib/kubelet/config.yaml

2.8.2.1 驱逐等级：

image

2.8.2.2 驱逐条件：

image

2.8.2.3 软驱逐

image

2.8.2.4 硬驱逐

image

标签：容忍,name,tomcat,app2,app,magedu,selector,反亲,污点
From： https://www.cnblogs.com/huningfei/p/17012088.html

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