ReplicationController（复制控制器），RS全称为ReplicaSet（复制集）Deployment等方式对pod进行部署、运行、管理，所以这里只对RC和RS进行简单介绍使用RC可以使Pod副本数达到指定数量，确保一个Pod或者一组同类Pod总是可用的
如果存在的Pod大于了设置的数量，那么RC将会终止多余的Pod，相反，如果小于设置的数量，RC则会启动一些Pod以达到设置的数量
和手动创建Pod不同，使用RC维护的Pod在失败、删除、终止时会自动替换，因此就算所需的应用程序只需要一个Pod，也应该使用RC或者其他的方式进行管理
RC类似于进程管理程序，但是RC不是监视单个节点上的各个进程，而是监视多个节点上的多个Pod
定义一个RC的示例：
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx
spec:
replicas: 3
selector:
app: nginx
template:
metadata:
name: nginx
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
RS是支持基于集合的标签选择器的新一代RC，RS主要作用于Deployment协调创建、删除、更新Pod，和RC的区别是，RS支持标签选择器
在实际应用中，RS可以单独使用，但是一般使用Deployment来自动管理RS，除非自定义的Pod不需要更新或者其他编排等
定义一个RS的示例：
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: frontend
labels:
app: test
sepc:
replicas: 3
selector:
matchLabels:
app: test
matchExpressions:
- {key: tier,operator: ln,values: [frontend]}
template:
metadata:
labels:
app: test
sepc:
containers:
- name: redis
images: redis:v1.0
resources:
requests:
cpu: 100m
memory: 100Mi
env:
- name: GET_HOSTS_FROM
value: dns
ports:
- containerPort: 6379
Deployment主要用于部署无状态的服务，是最常用的Pod控制器，一般用于管理公司中无状态的微服务，例如Config-Server注册中心、Zuul网关、SpringBoot微服务框架等，Deployment可以管理多个副本的Pod，实现无缝迁移、自动扩容缩容、自动灾难恢复、一键回滚功能等
注释：有状态服务与无状态服务：
- 有状态服务
1. 服务本身依赖或者存在局部的状态数据，这些数据需要自身持久化或者可以通过其他节点恢复。 2. 一个请求只能被某个节点（或者同等状态下的节点）处理。 3. 存储状态数据，实例的拓展需要整个系统参与状态的迁移。 4. 在一个封闭的系统中，存在多个数据闭环，需要考虑这些闭环的数据一致性问题。 5. 有状态服务通常存在于分布式架构中。
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- 无状态服务
1. 服务不依赖自身的状态，实例的状态数据可以维护在内存中。 2. 任何一个请求都可以被任意一个实例处理。 3. 不存储状态数据，实例可以水平拓展，通过负载均衡将请求分发到各个节点。 4. 在一个封闭的系统中，只存在一个数据闭环。 5.无状态服务通常存在于单体架构的集群中。
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虽然RS可以确保在任何给定时间运行的Pod副本数达到指定数量，但是Deployment是一个更高级的概念，它会管理RS，并且为Pod喝RS提供声明性更新，以及许多其他功能呢，一般实际工作中，会使用Deployment代替RS
如果在Deployment对象中描述了所需要的状态，那么Deployment控制器就会以可控制的速率将实际状态更改为期望状态，也可以在Deployment中创建RS，或者删除现有的Deployment并使用新的Deployment部署所需要的资源
[root@master1 ~]# kubectl create deployment nginx --image=nginx #创建deployment
deployment.apps/nginx created
[root@master1 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-f89759699-fjwr8 0/1 ContainerCreating 0 3s
[root@master1 ~]# kubectl get deployment #查看deployment的pod
NAME READY UP-TO-DATE AVAILABLE AGE
nginx 1/1 1 1 39s
[root@master1 ~]# kubectl get deployment nginx -o yaml > nginx.yaml #导出deployment的yaml文件，用于修改
[root@master1 ~]# ll
total 8
-rw-------. 1 root root 1259 Feb 23 17:13 anaconda-ks.cfg
-rw-r--r-- 1 root root 3703 Jun 22 09:59 nginx.yaml
kubectl replace命令，参数-f指定yaml或json文件，替换资源（类似于重载配置）[root@master1 ~]# kubectl replace -f nginx.yaml
deployment.apps/nginx replaced
kubectl edit命令，可以直接编辑、修改资源，edit命令会打开KUBE_EDITOR、GIT_EDITOR或者EDITOR环境变量定义的编辑器，可以同时编辑多个资源，但是编辑过的资源只会一次性提交，默认是YAML格式，加参数-o json可以以JSON格式编辑[root@master1 ~]# kubectl edit deployment nginx #进入编辑模式后与vim类似，修改完后会直接生效
Edit cancelled, no changes made.
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.14-alpine
ports:
- containerPort: 80
#注释：
示例解析：
kind：指定类型为Deployment的控制器
第一个metadata是定义Deployment的名称与标签
第一个sepc定义Deployment的资源
replicas：定义pod的副本数
template定义pod的详细信息
template下的spec定义容器的详细信息
[root@master1 ~]# kubectl create -f nginx.yaml
deployment.apps/nginx-deployment created
[root@master1 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deployment-6b75f4cbdd-8nmlv 1/1 Running 0 42m
nginx-deployment-6b75f4cbdd-f56z8 1/1 Running 0 39m
nginx-deployment-6b75f4cbdd-llhht 1/1 Running 0 42m
[root@master1 ~]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deployment 3/3 3 3 42m
[root@master1 ~]# kubectl get deploy -o wide #查看deployment的信息
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
nginx-deployment 3/3 3 3 43m nginx nginx:1.14-alpine app=nginx
#注释：
name：集群中deployment的名称
ready：pod的状态，已经ready的pod个数
up-to-date：显示已经达到期望状态的副本数
available：显示用户可以使用的应用程序副本数
age：显示应用程序运行的时间
containers：容器的名称
images：镜像名称
selector：管理的pod标签
[root@master1 ~]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-deployment-6b75f4cbdd-8nmlv 1/1 Running 0 50m app=nginx,pod-template-hash=6b75f4cbdd
nginx-deployment-6b75f4cbdd-f56z8 1/1 Running 0 47m app=nginx,pod-template-hash=6b75f4cbdd
nginx-deployment-6b75f4cbdd-llhht 1/1 Running 0 50m app=nginx,pod-template-hash=6b75f4cbdd
#注释
标签中'pod-template-hash=6b75f4cbdd'的这个值，表示RS的hash哈希值
[root@master1 ~]# kubectl get rs
NAME DESIRED CURRENT READY AGE
nginx-deployment-6b75f4cbdd 3 3 3 52m
[root@master1 ~]# kubectl rollout status deployment/nginx-deployment #查看资源状态
deployment "nginx-deployment" successfully rolled out
[root@master1 ~]# kubectl get deploy #查看deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deployment 3/3 3 3 3h12m
[root@master1 ~]# kubectl get rs #查看rs
NAME DESIRED CURRENT READY AGE
nginx-deployment-6b75f4cbdd 3 3 3 3h12m
[root@master1 ~]# kubectl get pods --show-labels #查看deployment创建的pod
NAME READY STATUS RESTARTS AGE LABELS
nginx-deployment-6b75f4cbdd-8nmlv 1/1 Running 0 3h12m app=nginx,pod-template-hash=6b75f4cbdd
nginx-deployment-6b75f4cbdd-f56z8 1/1 Running 0 3h10m app=nginx,pod-template-hash=6b75f4cbdd
nginx-deployment-6b75f4cbdd-llhht 1/1 Running 0 3h12m app=nginx,pod-template-hash=6b75f4cbdd
滚动更新[root@master1 ~]# kubectl get deploy #可以使用缩写进行查看
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deployment 3/3 3 3 23h
[root@master1 ~]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deployment 3/3 3 3 23h
#修改此deployment的镜像
[root@master1 ~]# kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text --record
————————————————————————————————
#除了使用set image进行修改，也可以使用kubectl edit deployment nginx直接对yaml文件进行编辑
————————————————————————————————
deployment.apps/nginx-deployment image updated
[root@master1 ~]# kubectl rollout status deployment.v1.apps/nginx-deployment #查看状态
Waiting for deployment "nginx-deployment" rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for deployment "nginx-deployment" rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for deployment "nginx-deployment" rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for deployment "nginx-deployment" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-deployment" rollout to finish: 1 old replicas are pending termination...
deployment "nginx-deployment" successfully rolled out
[root@master1 ~]# kubectl get rs #查看rs
NAME DESIRED CURRENT READY AGE
nginx-deployment-5d6b8b588c 3 3 3 3m58s
nginx-deployment-6b75f4cbdd 0 0 0 23h
[root@master1 ~]# kubectl describe deployments.apps nginx-deployment #使用describe查看deployment的详细信息
Name: nginx-deployment
Namespace: default
CreationTimestamp: Thu, 23 Jun 2022 10:31:28 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 2
kubernetes.io/change-cause: kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text --record=true
Selector: app=nginx
Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginxdemos/hello:plain-text
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-5d6b8b588c (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 7m8s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 6m47s (x2 over 23h) deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 6m47s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 6m46s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 6m46s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 3
Normal ScalingReplicaSet 6m45s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 0
#注释：
events的过程可以看到：
1、创建了一个新的deployment为'nginx-deployment-5d6b8b588c'，并且增加了一个RS，现在新的deploymentRS数量为1个
2、旧的deployment ' nginx-deployment-6b75f4cbdd'减少1个RS，现在旧的deploymentRS数量为2两个
3、新的deploymentRS数量再次增加，增加1个，现在新的deploymentRS数量为2两个
4、相应的旧的deploymentRS数量减少一个，数量为1个
5、新的deploymentRS再次增加，增加一个，现在为3个
6、旧的deploymentRS再次减少，减少一个，数量为0，同时也完成滚动更新
kubectl describe命令，可以看到deployment更新后的过程，是滚动更新回滚操作，默认情况下，所有Deployment的rollout（回退）历史都保存在系统中，可以随时进行回滚[root@master1 ~]# kubectl rollout history deployment nginx-deployment #使用kubectl rollout history可以查看修改记录
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
1 <none>
2 kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text --record=true
[root@master1 ~]# kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record #再次修改镜像，加--record可以记录到history中
deployment.apps/nginx-deployment image updated
[root@master1 ~]# kubectl describe deployments.apps nginx-deployment #查看详细信息
Name: nginx-deployment
Namespace: default
CreationTimestamp: Thu, 23 Jun 2022 10:31:28 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 3
kubernetes.io/change-cause: kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record=true
Selector: app=nginx
Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.14-alpine #可以看到镜像已经更换
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-6b75f4cbdd (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 34s deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 28s deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 28s deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 27s (x2 over 28h) deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 3
Normal ScalingReplicaSet 27s deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 25s deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 0
[root@master1 ~]# kubectl rollout history deployment nginx-deployment #查看历史记录，发现增加了一条
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
2 kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text --record=true
3 kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record=true
[root@master1 ~]# kubectl rollout history deployment nginx-deployment --revision=2 #查看编号2记录的详细信息，使用--revision可以指定版本查看详细信息
deployment.apps/nginx-deployment with revision #2
Pod Template:
Labels: app=nginx
pod-template-hash=5d6b8b588c
Annotations: kubernetes.io/change-cause: kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text --record=true
Containers:
nginx:
Image: nginxdemos/hello:plain-text
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
[root@master1 ~]# kubectl rollout undo deployment nginx-deployment #回滚到上一个版本
deployment.apps/nginx-deployment rolled back
[root@master1 ~]# kubectl describe deployments.apps nginx-deployment #再次查看详细信息
Name: nginx-deployment
Namespace: default
CreationTimestamp: Thu, 23 Jun 2022 10:31:28 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 4
kubernetes.io/change-cause: kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text --record=true
Selector: app=nginx
Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginxdemos/hello:plain-text #可以发现镜像已经变成了上一个版本的镜像
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-5d6b8b588c (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 6m7s deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 6m1s deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 6m1s deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 6m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 6m (x2 over 28h) deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 3
Normal ScalingReplicaSet 5m58s deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 0
Normal ScalingReplicaSet 4s (x2 over 5h8m) deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 3s (x2 over 5h8m) deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 3s (x3 over 28h) deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 1s (x3 over 2s) deployment-controller (combined from similar events): Scaled down replica set nginx-deployment-6b75f4cbdd to 0
–to-revision返回到指定版本：[root@master1 ~]# kubectl rollout history deployment nginx-deployment
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
3 kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record=true
4 kubectl scale deployment nginx-deployment --replicas=3 --record=true
[root@master1 ~]# kubectl rollout undo deployment nginx-deployment --to-revision=3 #返回3版本
deployment.apps/nginx-deployment rolled back
[root@master1 ~]# kubectl rollout history deployment nginx-deployment
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
4 kubectl scale deployment nginx-deployment --replicas=3 --record=true
5 kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record=true
Pod的副本数进行修改- 使用kubectl scale 进行修改，--replicas可以指定修改的副本数，--record=true可以使这条命令进行保留
[root@master1 ~]# kubectl scale deployment nginx-deployment --replicas=5 --record=true
deployment.apps/nginx-deployment scaled
[root@master1 ~]# kubectl rollout history deployment nginx-deployment
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
4 kubectl scale deployment nginx-deployment --replicas=3 --record=true
5 kubectl scale deployment nginx-deployment --replicas=5 --record=true
[root@master1 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deployment-6b75f4cbdd-7kn6x 1/1 Running 0 16s
nginx-deployment-6b75f4cbdd-7m72m 1/1 Running 0 3m2s
nginx-deployment-6b75f4cbdd-nh4rb 1/1 Running 0 2m58s
nginx-deployment-6b75f4cbdd-ntqw4 1/1 Running 0 3m
nginx-deployment-6b75f4cbdd-tvnxs 1/1 Running 0 16s
暂停更新，期间可以对Deployment进行多次修改[root@master1 ~]# kubectl rollout pause deployment nginx-deployment #kubectl rollout pause暂停
deployment.apps/nginx-deployment paused
#然后进行更新操作
[root@master1 ~]# kubectl set image deployment nginx-deployment nginx=nginxdemos/hello:plain-text
deployment.apps/nginx-deployment image updated
[root@master1 ~]# kubectl describe deployments.apps nginx-deployment #查看详细信息
Name: nginx-deployment
Namespace: default
CreationTimestamp: Thu, 23 Jun 2022 10:31:28 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 6
kubernetes.io/change-cause: kubectl scale deployment nginx-deployment --replicas=5 --record=true
Selector: app=nginx
Replicas: 5 desired | 0 updated | 5 total | 5 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginxdemos/hello:plain-text #成功更新
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing Unknown DeploymentPaused
OldReplicaSets: nginx-deployment-6b75f4cbdd (5/5 replicas created)
NewReplicaSet: nginx-deployment-5d6b8b588c (0/0 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 87m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 87m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 87m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 87m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 87m (x2 over 29h) deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 3
Normal ScalingReplicaSet 87m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 0
Normal ScalingReplicaSet 81m (x2 over 6h29m) deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 81m (x2 over 6h29m) deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 81m (x3 over 29h) deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 81m (x3 over 81m) deployment-controller (combined from similar events): Scaled down replica set nginx-deployment-6b75f4cbdd to 0
Normal ScalingReplicaSet 63m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 3
Normal ScalingReplicaSet 62m (x2 over 64m) deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 4
Normal ScalingReplicaSet 36m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 3
Normal ScalingReplicaSet 28m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 28m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 28m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 28m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 28m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 3
Normal ScalingReplicaSet 28m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 0
Normal ScalingReplicaSet 25m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 5
kubectl rollout resume可以恢复Deployment更新[root@master1 ~]# kubectl rollout pause deployment nginx-deployment
deployment.apps/nginx-deployment paused
[root@master1 ~]# kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record=true
deployment.apps/nginx-deployment image updated
[root@master1 ~]# kubectl rollout resume deployment nginx-deployment
[root@master1 ~]# kubectl describe deployments.apps nginx-deployment
Name: nginx-deployment
Namespace: default
CreationTimestamp: Thu, 23 Jun 2022 10:31:28 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 7
kubernetes.io/change-cause: kubectl set image deployment nginx-deployment nginx=nginx:1.14-alpine --record=true
Selector: app=nginx
Replicas: 5 desired | 5 updated | 5 total | 5 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.14-alpine #镜像已经更换
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-6b75f4cbdd (5/5 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 57m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 3
Normal ScalingReplicaSet 49m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 49m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 49m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 49m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 1
Normal ScalingReplicaSet 49m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 3
Normal ScalingReplicaSet 49m deployment-controller Scaled down replica set nginx-deployment-5d6b8b588c to 0
Normal ScalingReplicaSet 46m deployment-controller Scaled up replica set nginx-deployment-6b75f4cbdd to 5
Normal ScalingReplicaSet 2m49s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 3
Normal ScalingReplicaSet 2m49s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 2
Normal ScalingReplicaSet 2m49s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 4
Normal ScalingReplicaSet 2m48s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 3
Normal ScalingReplicaSet 2m48s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 4
Normal ScalingReplicaSet 2m47s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 2
Normal ScalingReplicaSet 2m47s deployment-controller Scaled up replica set nginx-deployment-5d6b8b588c to 5
Normal ScalingReplicaSet 2m47s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 1
Normal ScalingReplicaSet 2m46s deployment-controller Scaled down replica set nginx-deployment-6b75f4cbdd to 0
Normal ScalingReplicaSet 55s (x9 over 58s) deployment-controller (combined from similar events): Scaled down replica set nginx-deployment-5d6b8b588c to 0
rollout版本保留策略：
在默认情况下，revision保留
10个版本（RS），其余的将在后台进行垃圾回收，可以在spec.revisionHistoryLimit设置保留版本（RS）的个数。当设置为0时，不保留历史记录
deployment更新策略：
spec.strategy.type==Recreate：表示重建，先删掉旧的Pod再创建新的Podspec.strategy.type==RollingUpdate：表示滚动更新，可以指定下面的``maxUnavailable和maxSurge`来控制滚动更新过程spec.strategy.rollingUpdate.maxUnavailable：指定在回滚更新时最大不可用的Pod数量，可选字段，默认为25%，可以设置为数字或百分比，如果maxSurge设置为0，则这个值也不能为0spec.strategy.rollingUpdate.maxSurge：可以超过期望值的最大Pod数，可选字段，默认为25%，可以设置成数字或百分比，如果maxUnavailable为0，则该值不能为0maxSurge: 25%：指定一次可以添加多少个PodmaxUnavailable: 25%：指定滚动更新期间最多有多少个Pod不可用