kubernetes云平台管理实战:HPA水平自动伸缩(十一)
一、自动伸缩
1、启动
[root@k8s-master ~]# kubectl autoscale deployment nginx-deployment --max=8 --min=2 --cpu-percent=80
deployment "nginx-deployment" autoscaled
2、查看创建
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
deploy/nginx-deployment 2 2 2 2 13h NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
hpa/nginx-deployment Deployment/nginx-deployment 80% 0% 2 8 17s NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 2d
svc/nginx 10.254.145.15 <nodes> 80:32000/TCP 1d NAME DESIRED CURRENT READY AGE
rs/nginx-deployment-2950479891 0 0 0 13h
rs/nginx-deployment-3113009173 2 2 2 13h NAME READY STATUS RESTARTS AGE
po/nginx-deployment-3113009173-h5plc 1/1 Running 0 17s
po/nginx-deployment-3113009173-vckhg 1/1 Running 1 13h
3、修改副本数为1
[root@k8s-master ~]# kubectl edit deployment nginx-deployment
修改为1
replicas: 1
deployment "nginx-deployment" edited
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
deploy/nginx-deployment 1 1 1 1 13h NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 2d
svc/nginx 10.254.145.15 <nodes> 80:32000/TCP 1d NAME DESIRED CURRENT READY AGE
rs/nginx-deployment-2950479891 0 0 0 13h
rs/nginx-deployment-3113009173 1 1 1 13h NAME READY STATUS RESTARTS AGE
po/nginx-deployment-3113009173-vckhg 1/1 Running 1 13h
二、hpa伸缩
1、编辑horizontalpodautoscaler 文件
[root@k8s-master ~]# kubectl get horizontalpodautoscaler
NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
nginx-deployment Deployment/nginx-deployment 80% 0% 2 8 1m # Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
creationTimestamp: 2019-01-22T01:00:02Z
name: nginx-deployment
namespace: default
resourceVersion: "41194"
selfLink: /apis/autoscaling/v1/namespaces/default/horizontalpodautoscalers/nginx-deployment
uid: 0c897472-1de1-11e9-9773-000c292bd9e1
spec:
maxReplicas: 8
minReplicas: 2
scaleTargetRef:
apiVersion: extensions/v1beta1
kind: Deployment
name: nginx-deployment
targetCPUUtilizationPercentage: 80
status:
currentCPUUtilizationPercentage: 0
currentReplicas: 2
desiredReplicas: 2
lastScaleTime: 2019-01-22T01:00:02Z
2、修改副本为1
[root@k8s-master ~]# kubectl edit deployment nginx-deployment
replicas: 1
deployment "nginx-deployment" edited
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
deploy/nginx-deployment 2 2 2 2 13h NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
hpa/nginx-deployment Deployment/nginx-deployment 80% 0% 2 8 6m NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 2d
svc/nginx 10.254.145.15 <nodes> 80:32000/TCP 1d NAME DESIRED CURRENT READY AGE
rs/nginx-deployment-2950479891 0 0 0 13h
rs/nginx-deployment-3113009173 2 2 2 13h NAME READY STATUS RESTARTS AGE
po/nginx-deployment-3113009173-9hlq1 1/1 Running 0 2s
po/nginx-deployment-3113009173-vckhg 1/1 Running 1 13h
明明修改为1,怎么还有2个?是因为hpa如下配置
spec:
maxReplicas: 8
minReplicas: 2
3、修改副本数为5
[root@k8s-master ~]# kubectl edit hpa nginx-deployment
修改:
spec:
maxReplicas: 8
minReplicas: 5
horizontalpodautoscaler "nginx-deployment" edited
[root@k8s-master ~]# kubectl get all
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
deploy/nginx-deployment 5 5 5 2 13h NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
hpa/nginx-deployment Deployment/nginx-deployment 80% 0% 5 8 8m NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
svc/kubernetes 10.254.0.1 <none> 443/TCP 2d
svc/nginx 10.254.145.15 <nodes> 80:32000/TCP 1d NAME DESIRED CURRENT READY AGE
rs/nginx-deployment-2950479891 0 0 0 13h
rs/nginx-deployment-3113009173 5 5 2 13h NAME READY STATUS RESTARTS AGE
po/nginx-deployment-3113009173-97l9c 0/1 ContainerCreating 0 2s
po/nginx-deployment-3113009173-9hlq1 1/1 Running 0 2m
po/nginx-deployment-3113009173-qq4h8 0/1 ContainerCreating 0 2s
po/nginx-deployment-3113009173-sfp8z 0/1 ContainerCreating 0 2s
po/nginx-deployment-3113009173-vckhg 1/1 Running 1 13h
看到自动伸缩的过程了吧!
三、HAP-deployment-rs-rc-pod调用原理
1、什么是hpa
Horizontal Pod Autoscaling可以根据CPU使用率或应用自定义metrics自动扩展Pod数量(支持replication controller、deployment和replica set)。
- 控制管理器每隔30s(可以通过–horizontal-pod-autoscaler-sync-period修改)查询metrics的资源使用情况
- 支持三种metrics类型
- 预定义metrics(比如Pod的CPU)以利用率的方式计算
- 自定义的Pod metrics,以原始值(raw value)的方式计算
- 自定义的object metrics
- 支持两种metrics查询方式:Heapster和自定义的REST API
- 支持多metrics
客户端;
通过kubectl创建一个horizontalPodAutoscaler对象,并存储到etcd中
服务端:
api server:负责接受创建hpa对象,然后存入etcd
hpa controler和其他的controler类似,每30s同步一次,将已经创建的hpa进行一次管理(从heapster获取监控数据,查看是否需要scale, controler的store中就保存着从始至终创建出来的hpa,当做一个缓存),watch hpa有变化也会运行。从heapster中获取scale数据,和hpa对比,计算cup利用率等信息,然后重新调整scale。根据hpa.Spec.ScaleTargetRef.Kind(例如Deployment,然后deployment控制器在调整pod数量),调整其值,发送到apiserver存储到etcd,然后更新hpa到etcd.
2、示例
# 创建pod和service
$ kubectl run php-apache --image=gcr.io/google_containers/hpa-example --requests=cpu=200m --expose --port=80
service "php-apache" created
deployment "php-apache" created # 创建autoscaler
$ kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10
deployment "php-apache" autoscaled
$ kubectl get hpa
NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
php-apache Deployment/php-apache/scale 50% 0% 1 10 18s # 增加负载
$ kubectl run -i --tty load-generator --image=busybox /bin/sh
Hit enter for command prompt
$ while true; do wget -q -O- http://php-apache.default.svc.cluster.local; done # 过一会就可以看到负载升高了
$ kubectl get hpa
NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
php-apache Deployment/php-apache/scale 50% 305% 1 10 3m # autoscaler将这个deployment扩展为7个pod
$ kubectl get deployment php-apache
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
php-apache 7 7 7 7 19m # 删除刚才创建的负载增加pod后会发现负载降低,并且pod数量也自动降回1个
$ kubectl get hpa
NAME REFERENCE TARGET CURRENT MINPODS MAXPODS AGE
php-apache Deployment/php-apache/scale 50% 0% 1 10 11m $ kubectl get deployment php-apache
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
php-apache 1 1 1 1 27m
3、关系原理图
4、小结
1、首先最底层的资源永远都是pod
2、比pod高级一点的资源叫rc副本控制器
3、在pod上面有一个高级的rs
4、那谁来管理rs呢?是deployment
5、HPA自动管理deployment,deployment设置为1,HPA最低设置为3,deployment这就会被自动设计为3个
kubernetes云平台管理实战:HPA水平自动伸缩(十一)的更多相关文章
- kubernetes云平台管理实战: 自动加载到负载均衡(七)
一.如何实现外界能访问 外界访问不了 1.启动svc [root@k8s-master ~]# cat myweb-svc.yaml apiVersion: v1 kind: Service meta ...
- kubernetes云平台管理实战:deployment通过标签管理pod(十)
一.kubectl run命令拓展 1.RC创建 [root@k8s-master ~]# kubectl run web --generator=run/v1 --image=10.0.128.0: ...
- kubernetes云平台管理实战: 故障自愈实战(四)
一.创建实验文件 [root@k8s-master ~]# cat myweb-rc.yml apiVersion: v1 kind: ReplicationController metadata: ...
- kubernetes云平台管理实战: 集群部署(一)
一.环境规划 1.架构拓扑图 2.主机规划 3.软件版本 [root@k8s-master ~]# cat /etc/redhat-release CentOS Linux release 7.4.1 ...
- kubernetes云平台管理实战:如何创建deployment更好(九)
一.文件创建带--record 1.文件 [root@k8s-master ~]# cat nginx_deploy.yml apiVersion: extensions/v1beta1 kind: ...
- kubernetes云平台管理实战: 滚动升级秒级回滚(六)
一.nginx保证有两个版本 1.查看当前容器运行nginx版本 [root@k8s-master ~]# kubectl get pod -o wide NAME READY STATUS REST ...
- kubernetes云平台管理实战: 高级资源deployment-滚动升级(八)
一.通过文件创建deployment 1.创建deployment文件 [root@k8s-master ~]# cat nginx_deploy.yml apiVersion: extensions ...
- kubernetes云平台管理实战: 最小的资源pod(二)
一.pod初体验 1.编辑k8s_pod.yml文件 [root@k8s-master ~]# cat k8s_pod.yml apiVersion: v1 kind: Pod metadata: n ...
- kubernetes云平台管理实战: 服务发现和负载均衡(五)
一.rc控制器常用命令 1.rc控制器信息查看 [root@k8s-master ~]# kubectl get replicationcontroller NAME DESIRED CURRENT ...
随机推荐
- Swift JSON字符串和字典以及数组的互转
1.JSONString转换为字典 // JSONString转换为字典 func getDictionaryFromJSONString(jsonString:String) ->NSDict ...
- 【转载】FPGA算法设计随笔
FPGA设计算法依次需要完成MATLAB浮点仿真 MATLAB定点仿真 verilogHDL定点运算以及数据对比的流程.其中浮点到定点的转换尤为重要,需要在数据表示范围和精度之间做出权衡.另外掌握定点 ...
- MySQL从查找数据库表到删除全过程
使用DOS命令进入MySQL:mysql -u root -p 按回车键输入密码显示如下界面成功进入MySQL交互界面. 如果此时不知道MySQL有哪些数据库,使用显示所有数据库名语句:show ...
- 让 Windows7 - 64bit 支持 VC++ 6.0 的解决方法(无法启动此程序,因为计算机中丢失 MSVCRTD.dll。尝试重新安装该程序以解决此问题)
源地址:https://www.cnblogs.com/poissonnotes/p/4372136.html 无法启动此程序,因为计算机中丢失 MSVCRTD.dll.尝试重新安装该程序以解决此问题 ...
- python3 random模块
import random '''随机获取从0-1之间的小数'''print(random.random())print(format(random.random(), ".2f" ...
- Spring Security(三十六):12. Spring MVC Test Integration
Spring Security provides comprehensive integration with Spring MVC Test Spring Security提供与Spring MVC ...
- leetcode 263. Ugly Number 、264. Ugly Number II 、313. Super Ugly Number 、204. Count Primes
263. Ugly Number 注意:1.小于等于0都不属于丑数 2.while循环的判断不是num >= 0, 而是能被2 .3.5整除,即能被整除才去除这些数 class Solution ...
- 由Redis的hGetAll函数所引发的一次服务宕机事件
昨晚通宵生产压测,终于算是将生产服务宕机的原因定位到了,心累.这篇博客,算作一个复盘和记录吧... 先来看看Redis的缓存淘汰算法思维导图: 说明:当实际占用的内存超过Redis配置的maxmemo ...
- odoo11 访问MSQL Server等第三发数据源
odoo框架默认的访问时Postgres数据库,但在实际的应用场景中,不可避免的使用到其他数据库,所以有必要研究如何连接其他第三方数据库,这里分享下OCA的相关模块,具体的源代码在这里. 我将第三方的 ...
- vue 中使用jquery
vue-cli搭建的项目 第一种方式:npm 引包的方式 1.安装jquery npm install jquery --save 2.webpack配置 在项目根目录下的build目录下找到webp ...