kubectl scale命令用于程序在負載加重或縮小時進行pod擴容或縮小,我們通過一些實際例子來觀察scale命令到底能達到什么效果。
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命令行創(chuàng)建一個deployment:
kubectl run jerry-nginx --image=nginx:1.12.2

kubectl get deploy查看剛剛創(chuàng)建的deployment:

自動被deployment創(chuàng)建的pod:
kubectl get pod:

使用下列命令查看生成的deployment明細:
kubectl get deployment jerry-nginx -o yaml


apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "1"
creationTimestamp: 2018-11-29T08:29:06Z
generation: 1
labels:
run: jerry-nginx
name: jerry-nginx
namespace: part-0110
resourceVersion: "7203445"
selfLink: /apis/extensions/v1beta1/namespaces/part-0110/deployments/jerry-nginx
uid: d5c64f72-f3b0-11e8-b308-a20cb743f347
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 2
selector:
matchLabels:
run: jerry-nginx
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
run: jerry-nginx
spec:
containers:
- image: nginx:1.12.2
imagePullPolicy: IfNotPresent
name: jerry-nginx
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
DNSPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
status:
availableReplicas: 1
conditions:
lastTransitionTime: 2018-11-29T08:29:07Z
lastUpdateTime: 2018-11-29T08:29:07Z
message: Deployment has minimum availability.
reason: MinimumReplicasAvailable
status: "True"
type: Available
lastTransitionTime: 2018-11-29T08:29:06Z
lastUpdateTime: 2018-11-29T08:29:07Z
message: ReplicaSet "jerry-nginx-69fd9f6c4" has successfully progressed.
reason: NewReplicaSetAvailable
status: "True"
type: Progressing
observedGeneration: 1
readyReplicas: 1
replicas: 1
updatedReplicas: 1
另一個有用的命令:
kubectl describe deployment jerry-nginx

Name: jerry-nginx
Namespace: part-0110
CreationTimestamp: Thu, 29 Nov 2018 16:29:06 +0800
Labels: run=jerry-nginx
Annotations: deployment.kubernetes.io/revision: 1
Selector: run=jerry-nginx
Replicas: 1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: run=jerry-nginx
Containers:
jerry-nginx:
Image: nginx:1.12.2
Port: <none>
Host Port: <none>
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: jerry-nginx-69fd9f6c4 (1/1 replicas created)
Events:
Type Reason Age From Message
Normal ScalingReplicaSet 9m41s deployment-controller Scaled up replica set jerry-nginx-69fd9f6c4 to 1
現(xiàn)在我們使用下面的命令對deployment進行水平擴展:
kubectl scale deployment jerry-nginx --replicas=3

kubectl get pods -l run=jerry-nginx
下圖這個Age為15分鐘之前的是第一次創(chuàng)建deployment時生成的,其他兩個Age為1分鐘之前的是執(zhí)行了scale命令后自動創(chuàng)建的。

選中一個才創(chuàng)建的pod,查看其事件記錄:
kubectl describe pod jerry-nginx-69fd9f6c4-8dpvb

kubectl get replicaset
得到自動創(chuàng)建的replication set:

desired = 3意思就是我們水平擴展時指定的參數(shù)3.
即使手動刪除一個pod實例,replication set又會很快自動創(chuàng)建一個新的:

自動創(chuàng)建的新pod:

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新聞名稱:通過一個實際例子理解Kubernetes里pod的自動scale-水平自動伸縮
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