|NO.Z.00215|——————————|^^标准^^|——|KuberNetes&高级调度.V18|——|Topology.v02|Topology实现多地多机房部署|

一、拓扑域划分示例

二、使用Topology实现多地多机房部署

### --- 使用Topology实现多机柜部署
~~~ 模拟一下5个节点是属于同一个机房不同机柜的，为其打标签
[root@k8s-master01 ~]# kubectl label node k8s-master01 k8s-node01 jigui=1
node/k8s-master01 labeled
node/k8s-node01 labeled
[root@k8s-master01 ~]# kubectl label node k8s-master02 k8s-node02 jigui=2
node/k8s-master02 labeled
node/k8s-node02 labeled
[root@k8s-master01 ~]# kubectl label node k8s-master03 jigui=3
node/k8s-master03 labeled

### --- 改成机柜的来划分拓扑域
~~~ 是按照机柜来划分的拓扑域，在这个机柜里面，只能部署一个k8s-app=demo-nginx这个应用。
[root@k8s-master01 ~]# kubectl edit deploy demo-nginx
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- demo-nginx
topologyKey: jigui

### --- replace容器，查看pod部署位置
~~~ 之前的2个删除掉之后，pending状态的才可以被部署掉。
~~~ 因为根据刚才打的标签，k8s-master01和k8s-node01；
~~~ k8s-master02和k8s-node02，k8s-master03分别都是一个拓扑域，
~~~ 现在每个拓扑域上都有一个pod了，所以说这个Pending状态的demo-nginx就没有地方去部署了，
~~~ 因为每个拓扑域已经部署了一个
~~~ 在Terminating状态删除掉之后，它就会部署在其它的节点。
~~~ 但是不能是k8s-master02节点，因为k8s-master02已经占据了一个拓扑域，
~~~ 它只能部署在k8s-master02所在拓扑域之外的拓扑域。

[root@k8s-master01 ~]# kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 3 13h 172.25.92.90 k8s-master02
demo-nginx-5cb4fd6867-2c6d8 0/2 Pending 0 24s
demo-nginx-5cb4fd6867-wg4hc 2/2 Running 0 25s 172.25.92.93 k8s-master02
demo-nginx-7c464c79f7-hg4rm 0/2 Terminating 0 12h k8s-master03
demo-nginx-7c464c79f7-v7pmw 2/2 Terminating 0 12h 172.17.125.35 k8s-node01

### --- 查看pod部署位置
~~~ 部署在了k8s-master02和k8s-master03节点上
[root@k8s-master01 ~]# kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 3 13h 172.25.92.90 k8s-master02
demo-nginx-5cb4fd6867-2c6d8 2/2 Running 0 5m14s 172.18.195.43 k8s-master03
demo-nginx-5cb4fd6867-wg4hc 2/2 Running 0 5m15s 172.25.92.93 k8s-master02

三、把容器扩充到4个节点，验证部署结果

### --- 为容器扩容至4个节点，因为我们只有3个拓扑域，
[root@k8s-master01 ~]# kubectl scale deploy demo-nginx --replicas=4
deployment.apps/demo-nginx scaled

### --- 查看效果
~~~ 每个机柜只能跑一个，根据机柜互斥的原则，只能跑一个，所以第四个pending状态了
[root@k8s-master01 ~]# kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 4 13h 172.25.92.90 k8s-master02
demo-nginx-5cb4fd6867-2c6d8 2/2 Running 0 13m 172.18.195.43 k8s-master03
demo-nginx-5cb4fd6867-wg4hc 2/2 Running 0 13m 172.25.92.93 k8s-master02
demo-nginx-5cb4fd6867-wjjzz 0/2 Pending 0 15s
demo-nginx-5cb4fd6867-zbw7w 2/2 Running 0 15s 172.25.244.198 k8s-master01

### --- 把互斥改成软互斥，查看状态
~~~ 因为配置的是软亲和力，不是强一致性的，
~~~ 所以第四个显示pending状态的容器会漂移到其它的节点上面。
~~~ 改写为软亲和力，也就是说一个拓扑域是可以部署2个容器的
[root@k8s-master01 ~]# kubectl edit deploy demo-nginx
spec:
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution: // 将会 required改成preferred软互斥
- weight: 1
podAffinityTerm: // 添加软亲和力参数
labelSelector:
matchExpressions:
- key: app
operator: In
values:
- demo-nginx
topologyKey: jigui

### --- 查看状态
[root@k8s-master01 ~]# kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 4 13h 172.25.92.90 k8s-master02
demo-nginx-5cb4fd6867-2c6d8 2/2 Running 0 34m 172.18.195.43 k8s-master03
demo-nginx-5cb4fd6867-wg4hc 2/2 Running 0 34m 172.25.92.93 k8s-master02
demo-nginx-5cb4fd6867-zbw7w 2/2 Running 0 20m 172.25.244.198 k8s-master01
demo-nginx-6bdcdcc585-d56r8 0/2 Pending 0 3m51s
demo-nginx-6bdcdcc585-mhfhl 0/2 Pending 0 63s

### --- 因为有更新环节，所以有2个Pod显示是pending状态，把节点数量设置为0，重新触发容器
[root@k8s-master01 ~]# kubectl scale deploy demo-nginx --replicas=0
deployment.apps/demo-nginx scaled

### --- 重新设置为4个pod，验证部署结果
[root@k8s-master01 ~]# kubectl scale deploy demo-nginx --replicas=4
deployment.apps/demo-nginx scaled

~~~ # 可以看到k8s-master01部署了2个pod，
~~~ 它尽量的不部署在一块，但是若是条件满足不了，但是还是会部署在一块的。
[root@k8s-master01 ~]# kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 4 13h 172.25.92.90 k8s-master02
demo-nginx-6bdcdcc585-5wrx9 2/2 Running 0 46s 172.25.92.94 k8s-master02
demo-nginx-6bdcdcc585-cjcm2 2/2 Running 0 46s 172.18.195.44 k8s-master03
demo-nginx-6bdcdcc585-mpvfs 2/2 Running 0 45s 172.25.244.201 k8s-master01
demo-nginx-6bdcdcc585-zc4px 2/2 Running 0 46s 172.25.244.199 k8s-master01

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

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