[英]Kubernetes: how to scale my pods
我是 Kubernetes 的新手。 我尝试缩放我的豆荚。 首先,我启动了 3 个 pod:
./cluster/kubectl.sh run my-nginx --image=nginx --replicas=3 --port=80
有开始 3 个豆荚。 首先,我尝试使用复制控制器来扩大/缩小规模,但这并不存在。 现在似乎是一个副本集。
./cluster/kubectl.sh get rs
NAME DESIRED CURRENT AGE
my-nginx-2494149703 3 3 9h
我尝试更改副本集中描述的副本数量:
./cluster/kubectl.sh scale --replicas=5 rs/my-nginx-2494149703
replicaset "my-nginx-2494149703" scaled
但我仍然看到我的 3 个原始豆荚
./cluster/kubectl.sh get pods
NAME READY STATUS RESTARTS AGE
my-nginx-2494149703-04xrd 1/1 Running 0 9h
my-nginx-2494149703-h3krk 1/1 Running 0 9h
my-nginx-2494149703-hnayu 1/1 Running 0 9h
我希望看到 5 个豆荚。
./cluster/kubectl.sh describe rs/my-nginx-2494149703
Name: my-nginx-2494149703
Namespace: default
Image(s): nginx
Selector: pod-template-hash=2494149703,run=my-nginx
Labels: pod-template-hash=2494149703
run=my-nginx
Replicas: 3 current / 3 desired
Pods Status: 3 Running / 0 Waiting / 0 Succeeded / 0 Failed
为什么不扩大规模? 我是否还必须更改部署中的某些内容?
当我在扩展后描述我的 rs 时,我看到了类似的东西:(在这里我尝试从一个正在运行的 pod 扩展到 3 个正在运行的 pod)。 但它仍然是一个正在运行的吊舱。 其他 2 个立即启动并终止
34s 34s 1 {replicaset-controller } Normal SuccessfulCreate Created pod: my-nginx-1908062973-lylsz
34s 34s 1 {replicaset-controller } Normal SuccessfulCreate Created pod: my-nginx-1908062973-5rv8u
34s 34s 1 {replicaset-controller } Normal SuccessfulDelete Deleted pod: my-nginx-1908062973-lylsz
34s 34s 1 {replicaset-controller } Normal SuccessfulDelete Deleted pod: my-nginx-1908062973-5rv8u
这对我有用
kubectl scale --replicas=<expected_replica_num> deployment <deployment_label_name>
示例
# kubectl scale --replicas=3 deployment xyz
TL;DR:您需要扩展部署而不是直接扩展副本集。
如果您尝试扩展副本集,那么它将(在很短的时间内)有一个新的计数为 5。但是部署控制器将看到副本集的当前计数为 5,并且因为它知道它应该是为 3,它会将其重置为 3。通过手动修改为您创建的副本集,您正在与系统控制器作斗争(这是不倦的,并且几乎总是比您更持久)。
将其缩小到零,然后缩小到您需要的 pod 数量(猜它等于 3)
kubectl scale deployment <deployment-name> --replicas=0 -n <namespace>
kubectl scale deployment <deployment-name> --replicas=3 -n <namespace>
下面的例子展示了你应该如何扩大/缩小你的“pods/resource/deployments”。
k8smaster@k8smaster:~/debashish$ more createdeb_deployment1.yaml
---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: debdeploy-webserver
spec:
replicas: 1
selector:
matchLabels:
app: debdeploy1webserver
template:
metadata:
labels:
app: debdeploy1webserver
spec:
containers:
-
image: "docker.io/debu3645/debapachewebserver:v1"
name: deb-deploy1-container
ports:
-
containerPort: 6060
部署已创建-->
**kubectl -n debns1 create -f createdeb_deployment1.yaml**
k8smaster@k8smaster:~/debashish$ `kubectl scale --replicas=5 **deployment**/debdeploy-webserver -n debns1`
(扩展 5 个部署)
k8smaster@k8smaster:~/debashish$ kubectl get pods -n debns1
NAME READY STATUS RESTARTS AGE
debdeploy-webserver-7cf4fb74c5-8wvzx 1/1 Running 0 16s
debdeploy-webserver-7cf4fb74c5-jrf6v 1/1 Running 0 16s
debdeploy-webserver-7cf4fb74c5-m9fpw 1/1 Running 0 16s
debdeploy-webserver-7cf4fb74c5-q9n7r 1/1 Running 0 16s
debdeploy-webserver-7cf4fb74c5-ttw6p 1/1 Running 1 19h
resourcepod-deb1 1/1 Running 5 6d18h
k8smaster@k8smaster:~/debashish$ **kubectl get ep -n debns1**
NAME ENDPOINTS AGE
frontend-svc-deb 192.168.1.10:80,192.168.1.11:80,192.168.1.12:80 + 2 more... 18h
frontend-svc1-deb 192.168.1.8:80 14d
frontend-svc2-deb 192.168.1.8:80 5d19h
k8smaster@k8smaster:~/debashish$ **kubectl scale --replicas=2** deployment/debdeploy-webserver -n debns1
(从 5 缩小到 2 )
deployment.extensions/debdeploy-webserver 缩放
k8smaster@k8smaster:~/debashish$ **kubectl get pods -n debns1**
NAME READY STATUS RESTARTS AGE
debdeploy-webserver-7cf4fb74c5-8wvzx 1/1 Terminating 0 35m
debdeploy-webserver-7cf4fb74c5-jrf6v 1/1 Terminating 0 35m
debdeploy-webserver-7cf4fb74c5-m9fpw 1/1 Terminating 0 35m
debdeploy-webserver-7cf4fb74c5-q9n7r 1/1 Running 0 35m
debdeploy-webserver-7cf4fb74c5-ttw6p 1/1 Running 1 19h
resourcepod-deb1 1/1 Running 5 6d19h
k8smaster@k8smaster:~/debashish$ **kubectl get pods -n debns1**
NAME READY STATUS RESTARTS AGE
debdeploy-webserver-7cf4fb74c5-q9n7r 1/1 Running 0 37m
debdeploy-webserver-7cf4fb74c5-ttw6p 1/1 Running 1 19h
resourcepod-deb1 1/1 Running 5 6d19h
k8smaster@k8smaster:~/debashish$ kubectl **scale --current-replicas=4 --replicas=2** deployment/debdeploy-webserver -n debns1 (Check the current no. of deployments. If current replication is 4, then bring it down to 2, else dont do anything)
error: Expected replicas to be 4, was 2
k8smaster@k8smaster:~/debashish$ **kubectl scale --current-replicas=3 --replicas=10 deployment/debdeploy-webserver -n debns1**
error: Expected replicas to be 3, was 2
k8smaster@k8smaster:~/debashish$ **kubectl scale --current-replicas=2 --replicas=10 deployment/debdeploy-webserver -n debns1**
deployment.extensions/debdeploy-webserver 缩放
k8smaster@k8smaster:~/debashish$ **kubectl get pods -n debns1**
NAME READY STATUS RESTARTS AGE
debdeploy-webserver-7cf4fb74c5-46bxg 1/1 Running 0 6s
debdeploy-webserver-7cf4fb74c5-d6qsx 0/1 ContainerCreating 0 6s
debdeploy-webserver-7cf4fb74c5-fdq6v 1/1 Running 0 6s
debdeploy-webserver-7cf4fb74c5-gd87t 1/1 Running 0 6s
debdeploy-webserver-7cf4fb74c5-kqdbj 0/1 ContainerCreating 0 6s
debdeploy-webserver-7cf4fb74c5-q9n7r 1/1 Running 0 47m
debdeploy-webserver-7cf4fb74c5-qjvm6 1/1 Running 0 6s
debdeploy-webserver-7cf4fb74c5-skxq4 0/1 ContainerCreating 0 6s
debdeploy-webserver-7cf4fb74c5-ttw6p 1/1 Running 1 19h
debdeploy-webserver-7cf4fb74c5-wlc7q 0/1 ContainerCreating 0 6s
resourcepod-deb1 1/1 Running 5 6d19h
不确定这是否是我开始使用 kubernetes 的最佳方式,但我通过更新我的 yaml 文件来做到这一点
# app.yaml
apiVersion: apps/v1
...
spec:
replicas: <new value>
并运行$ kubectl scale -f app.yaml --replicas=<new value>
你可以通过运行$ kubectl get pods
来验证你的新副本数量
就我而言,我也有兴趣在谷歌云上缩减我的虚拟机。 我这样做了$ gcloud container clusters resize appName --size=1 --zone "my-zone"
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