Deployment简介
Deployment 为 Pod 和 ReplicaSet 提供了一个申明式定义 (declarative) 办法，用来代替以前的ReplicationController 来不便的治理利用。典型的利用场景包含；定义 Deployment 来创立 Pod 和 ReplicaSet
- 滚动降级和回滚利用
- 扩容和缩容
- 暂停和持续 Deploymen
Deployment 无状态服务最罕用的Pod管理器
Deployment 理论是治理ReplicaSet Deployment默认会保留10个ReplicaSet历史版本
Deployment 会把ReplicaSet之前个版本的正本数批改为0
Deployment 字段格局
<code class="shell">apiVersion: apps/v1 #API群组及版本
kind: Deployment #资源类型特有标识
metadata:
name <string> #资源名称,在作用域中要惟一
namespace <string> #名称空间;Deployment附属名称空间级别
spec:
minReadySeconds <integer> #Pod就绪后多少秒内任一容器无crash方可视为“就绪”
replicas <integer> #冀望的Pod正本数,默认为1
selector <object> #标签选择器，必须匹配template字段中Pod模板中的标签
template <object> #Pod模板对象
revisionHistoryLimit <integer> #滚动更新历史记录数量，默认为10
strategy <0bject> #滚动更新策略
type <string> #滚动更新类型，可用值有Recreate和Rollingupdate; Recreate 重建更新一次性删除所有Pod;Rollingupdate 滚动更新默认策略
rollingUpdate <0bject> #滚动更新参数，专用于RollingUpdate类型
maxSurge <string> #更新期间可比冀望的Pod数量多出的数量或比例
maxUnavailable <string> #更新期间可比冀望的Pod数量短少的数量或比例
progressDeadlineSeconds <integer> # 滚动更新故障超时时长，默认为600秒
paused <boolean> #是否暂停部暑过程
示例1: 创立Deployment控制器 Pod正本数为4
<code class="shell">[root@k8s-master PodControl]# cat deployment-demo.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment-demo
spec:
replicas: 4 #正本数来4
selector:
matchLabels:
app: demoapp
release: stable
template:
metadata:
labels :
app: demoapp
release: stable
spec:
containers:
- name: demoapp
image: ikubernetes/demoapp:${VERSION}
ports:
- containerPort: 80
name: http
[root@k8s-master PodControl]# kubectl apply -f deployment-demo.yaml
deployment.apps/deployment-demo created
[root@k8s-master PodControl]# VERSION=v1.0 envsubst < deployment-demo.yaml |kubectl apply -f -
deployment.apps/deployment-demo created
[root@k8s-master PodControl]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
deployment-demo 4/4 4 4 54s
#能够看到创立了同名的rs deployment理论治理的是rs而不是Pod
#名称中的 fb544c5d8 是通过配置文的生成的hash值,当查看到配置文件hash值变动就会启到更新
[root@k8s-master PodControl]# kubectl get rs
NAME DESIRED CURRENT READY AGE
deployment-demo-fb544c5d8 4 4 4 56s
[root@k8s-master PodControl]# kubectl get pod
NAME READY STATUS RESTARTS AGE
deployment-demo-fb544c5d8-kz8fn 1/1 Running 0 58s
deployment-demo-fb544c5d8-p6q4v 1/1 Running 0 58s
deployment-demo-fb544c5d8-ttjmt 1/1 Running 0 58s
deployment-demo-fb544c5d8-x2lqw 1/1 Running 0 58s
[root@k8s-master PodControl]# kubectl describe deployment/deployment-demo
Name: deployment-demo
Namespace: default
CreationTimestamp: Mon, 16 Aug 2021 16:17:28 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 1
Selector: app=demoapp,release=stable
Replicas: 4 desired | 4 updated | 4 total | 4 available | 0 unavailable
StrategyType: RollingUpdate #能够看到默认的更新策略
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge #默认的更新比例为 25%
更新deployment rollout命令查看状态
<code class="shell">[root@k8s-master PodControl]# kubectl rollout --help #查看张帮忙选项 Manage the rollout of a resource. Valid resource types include: #能够更新的资源类型 * deployments * daemonsets * statefulsets Examples: # Rollback to the previous deployment kubectl rollout undo deployment/abc # Check the rollout status of a daemonset kubectl rollout status daemonset/foo Available Commands: history View rollout history #历史记录 pause Mark the provided resource as paused #暂停 restart Restart a resource #重启 resume Resume a paused resource #复原临时资源 status Show the status of the rollout #查看资源更新状态 undo Undo a previous rollout #版本回退 [root@k8s-master PodControl]# VERSION=v1.1 envsubst < deployment-demo.yaml |kubectl apply -f - deployment.apps/deployment-demo configured [root@k8s-master PodControl]# kubectl rollout status deployment/deployment-demo deployment "deployment-demo" successfully rolled out #查看更新状态胜利 [root@k8s-master PodControl]# kubectl get deployment NAME READY UP-TO-DATE AVAILABLE AGE deployment-demo 4/4 4 4 2 [root@k8s-master PodControl]# kubectl get rs NAME DESIRED CURRENT READY AGE deployment-demo-867c7d9d55 4 4 4 6m5s deployment-demo-fb544c5d8 0 0 0 25m #旧版本正本数为0 [root@k8s-master PodControl]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES deployment-demo-867c7d9d55-d6xvt 1/1 Running 0 6m55s 10.244.1.229 k8s-node1 <none> <none> deployment-demo-867c7d9d55-l65z9 1/1 Running 0 6m47s 10.244.2.209 k8s-node2 <none> <none> deployment-demo-867c7d9d55-vhs6t 1/1 Running 0 6m55s 10.244.3.56 k8s-node3 <none> <none> deployment-demo-867c7d9d55-zc8dm 1/1 Running 0 6m43s 10.244.1.230 k8s-node1 <none> <none> [root@k8s-master PodControl]# curl 10.244.1.229 iKubernetes demoapp v1.1 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-867c7d9d55-d6xvt, ServerIP: 10.244.1.229!
-
在次更新应用 kubectl rollout status查看更新状态状
<code class="shell">[root@k8s-master PodControl]# VERSION=v1.2 envsubst < deployment-demo.yaml |kubectl apply -f - && kubectl rollout status deployment/deployment-demo deployment.apps/deployment-demo configured Waiting for deployment spec update to be observed... Waiting for deployment "deployment-demo" rollout to finish: 1 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 1 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 1 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 2 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 2 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 2 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 3 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 3 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 3 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 3 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 3 out of 4 new replicas have been updated... Waiting for deployment "deployment-demo" rollout to finish: 1 old replicas are pending termination... Waiting for deployment "deployment-demo" rollout to finish: 1 old replicas are pending termination... Waiting for deployment "deployment-demo" rollout to finish: 1 old replicas are pending termination... Waiting for deployment "deployment-demo" rollout to finish: 3 of 4 updated replicas are available... deployment "deployment-demo" successfully rolled out [root@k8s-master PodControl]# kubectl get rs #能够看到rs又多了一个版本正本数为0 NAME DESIRED CURRENT READY AGE deployment-demo-77d46c4794 4 4 4 2m25s deployment-demo-867c7d9d55 0 0 0 10m deployment-demo-fb544c5d8 0 0 0 29m #验证 [root@k8s-master PodControl]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES deployment-demo-77d46c4794-fbt5l 1/1 Running 0 2m44s 10.244.2.210 k8s-node2 <none> <none> deployment-demo-77d46c4794-kdvn2 1/1 Running 0 3m20s 10.244.1.231 k8s-node1 <none> <none> deployment-demo-77d46c4794-lcm28 1/1 Running 0 3m20s 10.244.3.57 k8s-node3 <none> <none> deployment-demo-77d46c4794-x52sh 1/1 Running 0 2m40s 10.244.1.232 k8s-node1 <none> <none> [root@k8s-master PodControl]# curl 10.244.2.210 iKubernetes demoapp v1.2 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-77d46c4794-fbt5l, ServerIP: 10.244.2.210!
示例2: Deployment版本回滚
- 回滚 回滚时能够指定回滚版本,默认回滚到前一个版本,
- 这里须要留神的是,假如以后版本为A,前一个版本为B,回滚后以后版本A变成前一版本,再次回滚后A从前一版本回滚到最新版本,所以如果不指定版本,回滚只在最初两个版本间滚动
<code class="shell">[root@k8s-master PodControl]# kubectl rollout history deployment/deployment-demo deployment.apps/deployment-demo REVISION CHANGE-CAUSE 1 <none> #更新过3次 3个不同的版本 回滚时能够 2 <none> 3 <none> [root@k8s-master PodControl]# kubectl rollout undo deployment/deployment-demo deployment.apps/deployment-demo rolled back [root@k8s-master PodControl]# kubectl rollout history deployment/deployment-demo deployment.apps/deployment-demo REVISION CHANGE-CAUSE 1 <none> 3 <none> 4 <none> #版本2变成4为最新版本 序列号只会递增 [root@k8s-master PodControl]# kubectl rollout undo --dry-run=server deployment/deployment-demo #不执行测试是否能胜利 deployment.apps/deployment-demo rolled back (server dry run) [root@k8s-master PodControl]# kubectl rollout undo deployment/deployment-demo --to-revision=1 #回滚到指定版本 deployment.apps/deployment-demo rolled back [root@k8s-master PodControl]# kubectl rollout history deployment/deployment-demo deployment.apps/deployment-demo REVISION CHANGE-CAUSE 3 <none> 4 <none> 5 <none> [root@k8s-master PodControl]# kubectl get rs NAME DESIRED CURRENT READY AGE deployment-demo-77d46c4794 0 0 0 17m deployment-demo-867c7d9d55 0 0 0 26m deployment-demo-fb544c5d8 4 4 4 45m #只有最开始的rs正本数为4 其它都为0 [root@k8s-master PodControl]# kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES deployment-demo-867c7d9d55-b65cm 0/1 Terminating 0 4m2s 10.244.1.234 k8s-node1 <none> <none> deployment-demo-867c7d9d55-pv8fp 1/1 Terminating 0 4m10s 10.244.3.58 k8s-node3 <none> <none> deployment-demo-867c7d9d55-tnhsg 1/1 Terminating 0 4m14s 10.244.1.233 k8s-node1 <none> <none> deployment-demo-867c7d9d55-wcvl7 1/1 Terminating 0 4m14s 10.244.2.211 k8s-node2 <none> <none> deployment-demo-fb544c5d8-5f9lp 1/1 Running 0 32s 10.244.1.235 k8s-node1 <none> <none> deployment-demo-fb544c5d8-d5lr9 1/1 Running 0 22s 10.244.1.236 k8s-node1 <none> <none> deployment-demo-fb544c5d8-lj5gt 1/1 Running 0 29s 10.244.3.59 k8s-node3 <none> <none> deployment-demo-fb544c5d8-t9swj 1/1 Running 0 32s 10.244.2.212 k8s-node2 <none> <none> [root@k8s-master PodControl]# curl 10.244.2.212 #测试回滚版本 iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-t9swj, ServerIP: 10.244.2.212!
示例3: 应用 pause 模仿金丝雀公布
<code class="shell"> #指定回滚版本或更新版本后,马上暂停,这样只回滚或更新第一批Pod,模仿金丝雀公布让 用一小部分流量测试服务是否失常 [root@k8s-master PodControl]# kubectl rollout undo deployment/deployment-demo --to-revision=3 && kubectl rollout pause deployment/deployment-demo deployment.apps/deployment-demo rolled back deployment.apps/deployment-demo paused #只更新了第一批就阻塞住了 [root@k8s-master PodControl]# kubectl rollout status deployment/deployment-demo Waiting for deployment "deployment-demo" rollout to finish: 2 out of 4 new replicas have been updated... [root@k8s-master PodControl]# kubectl get rs NAME DESIRED CURRENT READY AGE deployment-demo-58c8475bcc 0 0 0 5m42s deployment-demo-77d46c4794 2 2 1 36m deployment-demo-867c7d9d55 0 0 0 44m deployment-demo-fb544c5d8 3 3 3 63m [root@k8s-master ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE demoapp-deploy ClusterIP 10.107.174.169 <none> 80/TCP 18s #让流量 [root@k8s-master ~]# while true; do curl --connect-timeout 1 10.107.174.169; sleep .2;done #新旧版本同时存在 iKubernetes demoapp v1.2 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-77d46c4794-fhz4l, ServerIP: 10.244.1.238! iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-lj5gt, ServerIP: 10.244.3.59! iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-t9swj, ServerIP: 10.244.2.212! iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-5f9lp, ServerIP: 10.244.1.235! iKubernetes demoapp v1.2 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-77d46c4794-kmrhn, ServerIP: 10.244.3.60! iKubernetes demoapp v1.2 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-77d46c4794-fhz4l, ServerIP: 10.244.1.238! iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-lj5gt, ServerIP: 10.244.3.59! iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-t9swj, ServerIP: 10.244.2.212! iKubernetes demoapp v1.0 !! ClientIP: 10.244.0.0, ServerName: deployment-demo-fb544c5d8-5f9lp, ServerIP: 10.244.1.235!
示例4: 批改Deployment滚动更新策略
- 更新策略须要依据本人的理论状况配置 比方流量较大,要保障肯定的Pod数量,那就要保障更新时Pod的数量不能少
- 如果系统资源比拟缓和,那更新时Pod的数量要放弃不变,免得增大对系统资源的累赘
<code class="shell">[root@k8s-master PodControl]# cat deployment-demo-with-strategy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment-demo-with-strategy
spec:
replicas: 4
selector:
matchLabels:
app: demoapp
release: stable
strategy: ture
template:
metadata:
labels :
app: demoapp
release: stable
strategy: ture
spec:
containers:
- name: demoapp
image: ikubernetes/demoapp:${VERSION}
ports:
- containerPort: 80
name: http
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 0 #总的Pod数量不能多
maxUnavailable: 1 #总的数量能够缩小1个 先减在加 在系统资源紧缺的时候应用
[root@k8s-master PodControl]# VERSION=v1.0 envsubst < deployment-demo-with-strategy.yaml |kubectl apply -f -
deployment.apps/deployment-demo-with-strategy created
[root@k8s-master PodControl]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
deployment-demo 5/4 2 5 90m
deployment-demo-with-strategy 4/4 4 4 49s
[root@k8s-master PodControl]# kubectl describe deployment/deployment-demo-with-strategy
Name: deployment-demo-with-strategy
Namespace: default
CreationTimestamp: Mon, 16 Aug 2021 17:46:52 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 1
Selector: app=demoapp,release=stable,strategy=ture
Replicas: 4 desired | 4 updated | 4 total | 4 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 1 max unavailable, 0 max surge #更新策略失效
[root@k8s-master PodControl]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
deployment-demo 5/4 2 5 93m
deployment-demo-with-strategy 4/4 4 4 3m58s
[root@k8s-master PodControl]# kubectl get pod
NAME READY STATUS RESTARTS AGE
deployment-demo-77d46c4794-fhz4l 1/1 Running 0 26m
deployment-demo-77d46c4794-kmrhn 1/1 Running 0 26m
deployment-demo-fb544c5d8-5f9lp 1/1 Running 0 46m
deployment-demo-fb544c5d8-lj5gt 1/1 Running 0 46m
deployment-demo-fb544c5d8-t9swj 1/1 Running 0 46m
deployment-demo-with-strategy-57b96bdc87-8mjzw 1/1 Running 0 39s
deployment-demo-with-strategy-57b96bdc87-k6rxx 1/1 Running 0 38s
deployment-demo-with-strategy-57b96bdc87-v4tdj 1/1 Running 0 38s
deployment-demo-with-strategy-57b96bdc87-zdvcp 1/1 Running 0 38s
#查看更新状态 先减后增
[root@k8s-master PodControl]# VERSION=v1.1 envsubst < deployment-demo-with-strategy.yaml |kubectl apply -f - && kubectl rollout status deployment/deployment-demo-with-strategy
deployment.apps/deployment-demo-with-strategy configured
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 0 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 0 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 1 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 1 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 1 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 2 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 2 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 2 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 3 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 3 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 3 out of 4 new replicas have been updated...
Waiting for deployment "deployment-demo-with-strategy" rollout to finish: 3 of 4 updated replicas are available...
deployment "deployment-demo-with-strategy" successfully rolled out
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转载请注明原文链接：03kubernetes笔记-Pod控制器二-Deployment
转载请注明原文链接：03kubernetes笔记-Pod控制器二-Deployment
