kubernetes资源——deployment无状态负载
- 一、deployment无状态负载
- 1、deployment无状态负载
- 二、创建deployment
- 1、创建deployment
- 2、验证副本维护
- 三、deployment滚动更新
- 1、创建pod
- 2、测试滚动更新流程
- 2.1、修改镜像版本、或者副本数
- 2.2、执行更新
- 2.3、查看更新过程
- 2.4、查看更新历史
- 2.5、版本回退
- 2.6、暂停更新
一、deployment无状态负载
1、deployment无状态负载
一种特殊的pod
优势：
1、支持副本自动维护
2、支持滚动更新
应用场景: 频繁更新的业务
deployment创建流程：
deployment -----> RS(副本集) -----> POD
标签选择器：
标签，就是个key:value对的数据
通过标签在RS和POD间建立对应关系
二、创建deployment
1、创建deployment
apiVersion: apps/v1
kind: Deployment
metadata:name: test1-nginx
spec:replicas: 4selector:matchLabels:app: nginx // rs标签 template:metadata:labels:app: nginx // pod标签 spec:containers:- name: test1-nginximage: nginx:1.16imagePullPolicy: IfNotPresent
// 查看无状态负载
[root@k8s-master deployTest]# kubectl get deploy
NAME READY UP-TO-DATE AVAILABLE AGE
test1-nginx 4/4 4 4 52s// 查看rs副本集
[root@k8s-master deployTest]# kubectl get rs
NAME DESIRED CURRENT READY AGE
test1-nginx-5d858b7fc5 4 4 4 101s[root@k8s-master deployTest]# kubectl get pod
NAME READY STATUS RESTARTS AGE
test1-nginx-5d858b7fc5-74mps 1/1 Running 0 2m43s
test1-nginx-5d858b7fc5-kg8f7 1/1 Running 0 2m43s
test1-nginx-5d858b7fc5-ldx8s 1/1 Running 0 2m43s
test1-nginx-5d858b7fc5-x76z2 1/1 Running 0 2m43s// 查看pod的标签
[root@k8s-master deployTest]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test1-nginx-5d858b7fc5-74mps 1/1 Running 0 5m28s app=nginx,pod-template-hash=5d858b7fc5
test1-nginx-5d858b7fc5-kg8f7 1/1 Running 0 5m28s app=nginx,pod-template-hash=5d858b7fc5
test1-nginx-5d858b7fc5-ldx8s 1/1 Running 0 5m28s app=nginx,pod-template-hash=5d858b7fc5
test1-nginx-5d858b7fc5-x76z2 1/1 Running 0 5m28s app=nginx,pod-template-hash=5d858b7fc5
2、验证副本维护
[root@k8s-master deployTest]# kubectl get pod
NAME READY STATUS RESTARTS AGE
test1-nginx-5d858b7fc5-74mps 1/1 Running 0 7m39s
test1-nginx-5d858b7fc5-kg8f7 1/1 Running 0 7m39s
test1-nginx-5d858b7fc5-ldx8s 1/1 Running 0 7m39s
test1-nginx-5d858b7fc5-x76z2 1/1 Running 0 7m39s// 删除任意pod
[root@k8s-master deployTest]# kubectl delete pod test1-nginx-5d858b7fc5-ldx8s
pod "test1-nginx-5d858b7fc5-ldx8s" deleted// 再次查看pod
[root@k8s-master deployTest]# kubectl get pod
NAME READY STATUS RESTARTS AGE
test1-nginx-5d858b7fc5-74mps 1/1 Running 0 7m59s
test1-nginx-5d858b7fc5-kg8f7 1/1 Running 0 7m59s
test1-nginx-5d858b7fc5-wj6g6 1/1 Running 0 5s
test1-nginx-5d858b7fc5-x76z2 1/1 Running 0 7m59s
三、deployment滚动更新
1、创建pod
apiVersion: apps/v1
kind: Deployment
metadata:name: test2-nginx
spec:replicas: 6selector:matchLabels:app: nginx2strategy:type: RollingUpdate // 更新策略为滚动更新rollingUpdate:maxSurge: 2 // 每次更新的数量，可以是绝对数字、百分比数字maxUnavailable: 3 // 最大无效数量，可以是绝对数字、百分比数字template:metadata:labels:app: nginx2spec:containers:- name: test2-nginximage: nginx:1.16imagePullPolicy: IfNotPresent
[root@k8s-master deployTest]# kubectl get rs
NAME DESIRED CURRENT READY AGE
test2-nginx-569d77d6cb 6 6 6 85s[root@k8s-master deployTest]# kubectl get pod
NAME READY STATUS RESTARTS AGE
test2-nginx-569d77d6cb-4xmpw 1/1 Running 0 88s
test2-nginx-569d77d6cb-57xpk 1/1 Running 0 88s
test2-nginx-569d77d6cb-5bs4n 1/1 Running 0 88s
test2-nginx-569d77d6cb-9nsqb 1/1 Running 0 88s
test2-nginx-569d77d6cb-qstqr 1/1 Running 0 88s
test2-nginx-569d77d6cb-tqbkn 1/1 Running 0 88s
2、测试滚动更新流程
2.1、修改镜像版本、或者副本数
2.2、执行更新
[root@k8s-master deployTest]# kubectl apply -f test2-nginx.yaml
2.3、查看更新过程
[root@k8s-master deployTest]# kubectl get pod
NAME READY STATUS RESTARTS AGE
test2-nginx-569d77d6cb-46tjl 0/1 Terminating 0 6m48s
test2-nginx-569d77d6cb-88qwt 0/1 Terminating 0 6m46s
test2-nginx-569d77d6cb-8s8r9 1/1 Running 0 6m48s
test2-nginx-569d77d6cb-f7pdw 1/1 Running 0 6m48s
test2-nginx-569d77d6cb-jgtcx 0/1 Terminating 0 6m48s
test2-nginx-569d77d6cb-ttm7s 0/1 Terminating 0 6m45s
test2-nginx-569d77d6cb-vh7xh 1/1 Terminating 0 6m45s
test2-nginx-57c7d85bfd-5k87b 1/1 Running 0 4s
test2-nginx-57c7d85bfd-64vdn 1/1 Running 0 4s
test2-nginx-57c7d85bfd-9h7wv 0/1 ContainerCreating 0 2s
test2-nginx-57c7d85bfd-c9bbg 0/1 ContainerCreating 0 2s
test2-nginx-57c7d85bfd-df8nx 1/1 Running 0 4s
test2-nginx-57c7d85bfd-k7db6 0/1 ContainerCreating 0 2s
test2-nginx-57c7d85bfd-q5x2f 1/1 Running 0 4s
test2-nginx-57c7d85bfd-sbbkw 1/1 Running 0 4s
test2-nginx-57c7d85bfd-t8f5z 0/1 ContainerCreating 0 1s
test2-nginx-57c7d85bfd-x58dd 0/1 ContainerCreating 0 2s
[root@k8s-master deployTest]# kubectl describe deploy test2-nginx
Name: test2-nginx
Namespace: default
CreationTimestamp: Thu, 25 Jul 2024 16:34:04 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 4
Selector: app=nginx2
Replicas: 10 desired | 10 updated | 10 total | 10 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 3 max unavailable, 2 max surge
Pod Template:Labels: app=nginx2Containers:test2-nginx:Image: nginx:1.18Port: <none>Host Port: <none>Environment: <none>Mounts: <none>Volumes: <none>
Conditions:Type Status Reason---- ------ ------Available True MinimumReplicasAvailableProgressing True NewReplicaSetAvailable
OldReplicaSets: test2-nginx-569d77d6cb (0/0 replicas created)
NewReplicaSet: test2-nginx-57c7d85bfd (10/10 replicas created)
Events:Type Reason Age From Message---- ------ ---- ---- -------Normal ScalingReplicaSet 13m deployment-controller Scaled up replica set test2-nginx-569d77d6cb to 6Normal ScalingReplicaSet 9m51s deployment-controller Scaled up replica set test2-nginx-57c7d85bfd to 2Normal ScalingReplicaSet 9m51s deployment-controller Scaled down replica set test2-nginx-569d77d6cb to 3 from 6Normal ScalingReplicaSet 9m51s deployment-controller Scaled up replica set test2-nginx-57c7d85bfd to 5 from 2Normal ScalingReplicaSet 9m49s deployment-controller Scaled down replica set test2-nginx-569d77d6cb to 2 from 3Normal ScalingReplicaSet 9m49s deployment-controller Scaled up replica set test2-nginx-57c7d85bfd to 6 from 5Normal ScalingReplicaSet 9m48s deployment-controller Scaled down replica set test2-nginx-569d77d6cb to 1 from 2Normal ScalingReplicaSet 9m48s deployment-controller Scaled down replica set test2-nginx-569d77d6cb to 0 from 1Normal ScalingReplicaSet 9m1s deployment-controller Scaled up replica set test2-nginx-57c7d85bfd to 10 from 6Normal ScalingReplicaSet 2m17s (x18 over 9m1s) deployment-controller (combined from similar events): Scaled up replica set test2-nginx-57c7d85bfd to 5 from 2
2.4、查看更新历史
[root@k8s-master deployTest]# kubectl rollout history deploy test2-nginx
deployment.apps/test2-nginx
REVISION CHANGE-CAUSE
2 <none>
3 <none>
2.5、版本回退
[root@k8s-master deployTest]# kubectl rollout undo deployment test2-nginx --to-revision=2
deployment.apps/test2-nginx rolled back
2.6、暂停更新
[root@k8s-master deployTest]# kubectl rollout pause deployment test2-nginx
