前文我们了解了k8s上的Pod资源的生命周期、健康状态和就绪状态探测以及资源限制相关话题，回顾请参考https://www.cnblogs.com/qiuhom-1874/p/14143610.html；今天我们来了解下Pod控制器相关话题；
在k8s上控制器就是k8s的“大脑”，在聊k8s开篇时，我们说过控制器主要负责创建，管理k8s上的资源，如果对应资源不吻合用户定义的资源状态，它就会尝试重启或重建的方式让其状态和用户定义的状态吻合；在k8s上控制器的类型有很多，比如pod控制，service控制器，endpoint控制器等等；不同类型的控制器有着不同的功能和作用；比如pod控制器就是针对pod资源进行管理的控制器；单说pod控制器，它也有很多类型，根据pod里容器跑的应用程序来分类，可以分为有状态应用和无状态应用控制，从应用程序是否运行为守护进程我们可以将控制器分为，守护进程和非守护进程控制器；其中无状态控制器中最常用的有ReplicaSet控制器和Deployment控制；有状态应用控制器常用的有StatefulSet；守护进程控制器最常用的有daemonSet控制器；非守护进程控制器有job控制器，对Job类型的控制器，如果要周期性执行的有Cronjob控制器；
1、ReplicaSet控制器
ReplicaSet控制器的主要作用是确保Pod对象副本数量在任何时刻都能精准满足用户期望的数量；这种控制器启动以后，它首先会查找集群中匹配其标签选择器的Pod资源对象，当活动pod数量与用户期望的pod数量不吻合时，如果多了就删除，少了就创建；它创建新pod是靠我们在配置清单中定义的pod模板来创建新pod；
示例：定义创建ReplicaSet控制器
[root@master01 ~]# cat ReplicaSet-controller-demo.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: replicaset-demo
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: nginx-pod
template:
metadata:
labels:
app: nginx-pod
spec:
containers:
- name: nginx
image: nginx:1.14-alpine
ports:
- name: http
containerPort: 80
[root@master01 ~]#
提示：定义ReplicaSet控制器，apiVersion字段的值为apps/v1，kind为ReplicaSet，这两个字段都是固定的；后面的metadata中主要定义名称和名称空间；spec中主要定义replicas、selector、template；其中replicas这个字段的值为一个整数，表示对应pod的副本数量；selector用于定义标签选择器；其值为一个对象，其中matchLabels字段表示精确匹配标签，这个字段的值为一个字典；除了精确匹配标签选择器这种方式，还有matchExpressions表示使用匹配表达式，其值为一个对象；简单说定义标签选择器，第一种是matchLabels，这种方式就是指定一个或多个标签，每个标签就是一个kvj键值对；后者matchExpressions是指定一个表达式，其值为一个对象，这个对象中主要定义key字段，这个字段定义key的名称；operator定义操作符，values定义值；key和operator字段的值类型都是字符串，其中operator的值有In,NotIn,Exists和DoesNotExist；values是一个字符串列表；其次就是定义pod模板，使用template字段定义，该字段的值为一个对象其中metadata字段用于定义模板的元素据信息，这个元数据信息必须定义标签属性；通常这个标签属性和选择器中的标签相同；spec字段用于定义pod模板的状态，最重要的是定义pod里容器的名字，镜像等等；
应用资源配置清单
[root@master01 ~]# kubectl apply -f ReplicaSet-controller-demo.yaml replicaset.apps/replicaset-demo created [root@master01 ~]# kubectl get rs NAME DESIRED CURRENT READY AGE replicaset-demo 3 3 3 9s [root@master01 ~]# kubectl get rs -o wide NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR replicaset-demo 3 3 3 17s nginx nginx:1.14-alpine app=nginx-pod [root@master01 ~]#
提示：rs就是ReplicaSet的简写；从上面的信息可以看到对应控制器已经创建；并且当前pod副本数量为3，用户期望的数量也为3，有3个准备就绪；
查看pod
[root@master01 ~]# kubectl get pod -L app NAME READY STATUS RESTARTS AGE APP replicaset-demo-rsl7q 1/1 Running 0 2m57s nginx-pod replicaset-demo-twknl 1/1 Running 0 2m57s nginx-pod replicaset-demo-vzdbb 1/1 Running 0 2m57s nginx-pod [root@master01 ~]#
提示：可以看到当前default名称空间中创建了3个pod,其标签为nginx-pod；
测试：更改其中一个pod的标签为ngx,看看对应控制器是否会新建一个标签为nginx-pod的pod呢？
[root@master01 ~]# kubectl get pod -L app NAME READY STATUS RESTARTS AGE APP replicaset-demo-rsl7q 1/1 Running 0 5m48s nginx-pod replicaset-demo-twknl 1/1 Running 0 5m48s nginx-pod replicaset-demo-vzdbb 1/1 Running 0 5m48s nginx-pod [root@master01 ~]# kubectl label pod/replicaset-demo-vzdbb app=ngx --overwrite pod/replicaset-demo-vzdbb labeled [root@master01 ~]# kubectl get pod -L app NAME READY STATUS RESTARTS AGE APP replicaset-demo-qv8tp 1/1 Running 0 4s nginx-pod replicaset-demo-rsl7q 1/1 Running 0 6m2s nginx-pod replicaset-demo-twknl 1/1 Running 0 6m2s nginx-pod replicaset-demo-vzdbb 1/1 Running 0 6m2s ngx [root@master01 ~]#
提示：可以看到当我们把其中一个pod的标签更改为app=ngx后，对应控制器又会根据pod模板创建一个新pod；
测试：更改pod标签为app=nginx-pod，看看对应控制器是否会删除一个pod呢？
[root@master01 ~]# kubectl get pod -L app NAME READY STATUS RESTARTS AGE APP replicaset-demo-qv8tp 1/1 Running 0 2m35s nginx-pod replicaset-demo-rsl7q 1/1 Running 0 8m33s nginx-pod replicaset-demo-twknl 1/1 Running 0 8m33s nginx-pod replicaset-demo-vzdbb 1/1 Running 0 8m33s ngx [root@master01 ~]# kubectl label pod/replicaset-demo-vzdbb app=nginx-pod --overwrite pod/replicaset-demo-vzdbb labeled [root@master01 ~]# kubectl get pod -L app NAME READY STATUS RESTARTS AGE APP replicaset-demo-qv8tp 0/1 Terminating 0 2m50s nginx-pod replicaset-demo-rsl7q 1/1 Running 0 8m48s nginx-pod replicaset-demo-twknl 1/1 Running 0 8m48s nginx-pod replicaset-demo-vzdbb 1/1 Running 0 8m48s nginx-pod [root@master01 ~]# kubectl get pod -L app NAME READY STATUS RESTARTS AGE APP replicaset-demo-rsl7q 1/1 Running 0 8m57s nginx-pod replicaset-demo-twknl 1/1 Running 0 8m57s nginx-pod replicaset-demo-vzdbb 1/1 Running 0 8m57s nginx-pod [root@master01 ~]#
提示：可以看到当集群中有多余用户期望数量的pod标签时，对应控制器会把多余的相同标签的pod删除；从上面的测试可以看到ReplicaSet控制器是依靠标签选择器来判断集群中pod的数量是否和用户定义的数量吻合，如果不吻合就尝试删除或新建，让对应pod数量精确满足用户期望pod数量；
查看rs控制器的详细信息
[root@master01 ~]# kubectl describe rs replicaset-demo
Name: replicaset-demo
Namespace: default
Selector: app=nginx-pod
Labels: <none>
Annotations: <none>
Replicas: 3 current / 3 desired
Pods Status: 3 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=nginx-pod
Containers:
nginx:
Image: nginx:1.14-alpine
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 20m replicaset-controller Created pod: replicaset-demo-twknl
Normal SuccessfulCreate 20m replicaset-controller Created pod: replicaset-demo-vzdbb
Normal SuccessfulCreate 20m replicaset-controller Created pod: replicaset-demo-rsl7q
Normal SuccessfulCreate 15m replicaset-controller Created pod: replicaset-demo-qv8tp
Normal SuccessfulDelete 12m replicaset-controller Deleted pod: replicaset-demo-qv8tp
[root@master01 ~]#
扩展/缩减rs控制pod副本数量
[root@master01 ~]# kubectl scale rs replicaset-demo --replicas=6 replicaset.apps/replicaset-demo scaled [root@master01 ~]# kubectl get rs NAME DESIRED CURRENT READY AGE replicaset-demo 6 6 6 32m [root@master01 ~]# kubectl scale rs replicaset-demo --replicas=4 replicaset.apps/replicaset-demo scaled [root@master01 ~]# kubectl get rs NAME DESIRED CURRENT READY AGE replicaset-demo 4 4 4 32m [root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE replicaset-demo-5t9tt 0/1 Terminating 0 33s replicaset-demo-j75hk 1/1 Running 0 33s replicaset-demo-rsl7q 1/1 Running 0 33m replicaset-demo-twknl 1/1 Running 0 33m replicaset-demo-vvqfw 0/1 Terminating 0 33s replicaset-demo-vzdbb 1/1 Running 0 33m [root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE replicaset-demo-j75hk 1/1 Running 0 41s replicaset-demo-rsl7q 1/1 Running 0 33m replicaset-demo-twknl 1/1 Running 0 33m replicaset-demo-vzdbb 1/1 Running 0 33m [root@master01 ~]#
提示：scale也可以对控制器做扩展和缩减pod副本数量，除了以上使用命令的方式来变更对应pod副本数量；也可以直接在配置清单中修改replicas字段，然后使用apply命令执行配置清单进行修改；
修改配置清单中的replicas字段的值来扩展pod副本数量
[root@master01 ~]# cat ReplicaSet-controller-demo.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: replicaset-demo
namespace: default
spec:
replicas: 7
selector:
matchLabels:
app: nginx-pod
template:
metadata:
labels:
app: nginx-pod
spec:
containers:
- name: nginx
image: nginx:1.14-alpine
ports:
- name: http
containerPort: 80
[root@master01 ~]# kubectl apply -f ReplicaSet-controller-demo.yaml
replicaset.apps/replicaset-demo configured
[root@master01 ~]# kubectl get rs
NAME DESIRED CURRENT READY AGE
replicaset-demo 7 7 7 35m
[root@master01 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
replicaset-demo-j75hk 1/1 Running 0 3m33s
replicaset-demo-k2n9g 1/1 Running 0 9s
replicaset-demo-n7fmk 1/1 Running 0 9s
replicaset-demo-q4dc6 1/1 Running 0 9s
replicaset-demo-rsl7q 1/1 Running 0 36m
replicaset-demo-twknl 1/1 Running 0 36m
replicaset-demo-vzdbb 1/1 Running 0 36m
[root@master01 ~]#
更新pod版本
方式1修改资源配置清单中pod模板的版本，然后在使用apply命令来执行配置清单
[root@master01 ~]# cat ReplicaSet-controller-demo.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: replicaset-demo
namespace: default
spec:
replicas: 7
selector:
matchLabels:
app: nginx-pod
template:
metadata:
labels:
app: nginx-pod
spec:
containers:
- name: nginx
image: nginx:1.16-alpine
ports:
- name: http
containerPort: 80
[root@master01 ~]# kubectl apply -f ReplicaSet-controller-demo.yaml
replicaset.apps/replicaset-demo configured
[root@master01 ~]# kubectl get rs -o wide
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
replicaset-demo 7 7 7 55m nginx nginx:1.16-alpine app=nginx-pod
[root@master01 ~]#
提示：从上面命令可以看到，它显示的镜像版本是1.16的版本；
验证：查看对应pod，看看对应pod中容器镜像版本是否变成了1.16呢？
[root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE replicaset-demo-j75hk 1/1 Running 0 25m replicaset-demo-k2n9g 1/1 Running 0 21m replicaset-demo-n7fmk 1/1 Running 0 21m replicaset-demo-q4dc6 1/1 Running 0 21m replicaset-demo-rsl7q 1/1 Running 0 57m replicaset-demo-twknl 1/1 Running 0 57m replicaset-demo-vzdbb 1/1 Running 0 57m [root@master01 ~]#
提示：从pod创建的时间来看，pod没有更新；
测试：删除一个pod看看对应pod里容器镜像是否会更新呢？
[root@master01 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
replicaset-demo-j75hk 1/1 Running 0 25m
replicaset-demo-k2n9g 1/1 Running 0 21m
replicaset-demo-n7fmk 1/1 Running 0 21m
replicaset-demo-q4dc6 1/1 Running 0 21m
replicaset-demo-rsl7q 1/1 Running 0 57m
replicaset-demo-twknl 1/1 Running 0 57m
replicaset-demo-vzdbb 1/1 Running 0 57m
[root@master01 ~]# kubectl delete pod/replicaset-demo-vzdbb
pod "replicaset-demo-vzdbb" deleted
[root@master01 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
replicaset-demo-9wqj9 0/1 ContainerCreating 0 10s
replicaset-demo-j75hk 1/1 Running 0 26m
replicaset-demo-k2n9g 1/1 Running 0 23m
replicaset-demo-n7fmk 1/1 Running 0 23m
replicaset-demo-q4dc6 1/1 Running 0 23m
replicaset-demo-rsl7q 1/1 Running 0 58m
replicaset-demo-twknl 1/1 Running 0 58m
[root@master01 ~]# kubectl describe pod/replicaset-demo-9wqj9 |grep Image
Image: nginx:1.16-alpine
Image ID: docker-pullable://nginx@sha256:5057451e461dda671da5e951019ddbff9d96a751fc7d548053523ca1f848c1ad
[root@master01 ~]#
提示：可以看到我们删除了一个pod，对应控制器又新建了一个pod，对应新建的pod镜像版本就成为了新版本的pod；从上面测试情况可以看到，对于rs控制器当pod模板中的镜像版本发生更改，如果k8s集群上对应pod数量和用户定义的数量吻合，此时rs控制器不会更新pod；只有新建后的pod才会拥有新版本；也就说如果我们要rs来对pod版本更新，就得删除原有老的pod后才会更新；
方式2使用命令更新pod版本
[root@master01 ~]# kubectl set image rs replicaset-demo nginx=nginx:1.18-alpine replicaset.apps/replicaset-demo image updated [root@master01 ~]# kubectl get rs -o wide NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR replicaset-demo 7 7 7 72m nginx nginx:1.18-alpine app=nginx-pod [root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE replicaset-demo-9wqj9 1/1 Running 0 13m replicaset-demo-j75hk 1/1 Running 0 40m replicaset-demo-k2n9g 1/1 Running 0 36m replicaset-demo-n7fmk 1/1 Running 0 36m replicaset-demo-q4dc6 1/1 Running 0 36m replicaset-demo-rsl7q 1/1 Running 0 72m replicaset-demo-twknl 1/1 Running 0 72m [root@master01 ~]#
提示：对于rs控制器，不管用命令还是修改资源配置清单中pod模板中镜像版本，如果有和用户期望数量的pod，它是不会自动更新pod版本的；只有手动删除老版本pod，对应新版本pod才会被创建；
2、deployment控制器
对于deployment控制来说，它的定义方式和rs控制都差不多，但deploy控制器的功能要比rs强大，它可以实现滚动更新，用户手动定义更新策略；其实deploy控制器是在rs控制器的基础上来管理pod；也就说我们在创建deploy控制器时，它自动会创建一个rs控制器；其中使用deployment控制器创建的pod名称是由deploy控制器名称加上“-”pod模板hash名称加上“-”随机字符串；而对应rs控制器的名称恰好就是deploy控制器名称加“-”pod模板hash；即pod名称就为rs控制器名称加“-”随机字符串；
示例：创建deployment控制器
[root@master01 ~]# cat deploy-demo.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy-demo
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: ngx-dep-pod
template:
metadata:
labels:
app: ngx-dep-pod
spec:
containers:
- name: nginx
image: nginx:1.14-alpine
ports:
- name: http
containerPort: 80
[root@master01 ~]#
应用配置清单
[root@master01 ~]# kubectl apply -f deploy-demo.yaml deployment.apps/deploy-demo created [root@master01 ~]# kubectl get deploy -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deploy-demo 3/3 3 3 10s nginx nginx:1.14-alpine app=ngx-dep-pod [root@master01 ~]#
验证：查看是否有rs控制器创建？
[root@master01 ~]# kubectl get rs NAME DESIRED CURRENT READY AGE deploy-demo-6d795f958b 3 3 3 57s replicaset-demo 7 7 7 84m [root@master01 ~]#
提示：可以看到有一个deploy-demo-6d795f958b的rs控制器被创建；
验证：查看pod，看看对应pod名称是否有rs控制器名称加“-”一串随机字符串？
[root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE deploy-demo-6d795f958b-bppjr 1/1 Running 0 2m16s deploy-demo-6d795f958b-mxwkn 1/1 Running 0 2m16s deploy-demo-6d795f958b-sh76g 1/1 Running 0 2m16s replicaset-demo-9wqj9 1/1 Running 0 26m replicaset-demo-j75hk 1/1 Running 0 52m replicaset-demo-k2n9g 1/1 Running 0 49m replicaset-demo-n7fmk 1/1 Running 0 49m replicaset-demo-q4dc6 1/1 Running 0 49m replicaset-demo-rsl7q 1/1 Running 0 85m replicaset-demo-twknl 1/1 Running 0 85m [root@master01 ~]#
提示：可以看到有3个pod的名称是deploy-demo-6d795f958b-加随机字符串；
更新pod版本
[root@master01 ~]# cat deploy-demo.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy-demo
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: ngx-dep-pod
template:
metadata:
labels:
app: ngx-dep-pod
spec:
containers:
- name: nginx
image: nginx:1.16-alpine
ports:
- name: http
containerPort: 80
[root@master01 ~]# kubectl apply -f deploy-demo.yaml
deployment.apps/deploy-demo configured
[root@master01 ~]# kubectl get deploy -o wide
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
deploy-demo 3/3 3 3 5m45s nginx nginx:1.16-alpine app=ngx-dep-pod
[root@master01 ~]# kubectl get pod
NAME READY STATUS RESTARTS AGE
deploy-demo-95cc58f4d-45l5c 1/1 Running 0 43s
deploy-demo-95cc58f4d-6bmb6 1/1 Running 0 45s
deploy-demo-95cc58f4d-7d5r5 1/1 Running 0 29s
replicaset-demo-9wqj9 1/1 Running 0 30m
replicaset-demo-j75hk 1/1 Running 0 56m
replicaset-demo-k2n9g 1/1 Running 0 53m
replicaset-demo-n7fmk 1/1 Running 0 53m
replicaset-demo-q4dc6 1/1 Running 0 53m
replicaset-demo-rsl7q 1/1 Running 0 89m
replicaset-demo-twknl 1/1 Running 0 89m
[root@master01 ~]#
提示：可以看到deploy控制器只要更改了pod模板中镜像版本，对应pod会自动更新；
使用命令更新pod版本
[root@master01 ~]# kubectl set image deploy deploy-demo nginx=nginx:1.18-alpine deployment.apps/deploy-demo image updated [root@master01 ~]# kubectl get deploy NAME READY UP-TO-DATE AVAILABLE AGE deploy-demo 3/3 1 3 9m5s [root@master01 ~]# kubectl get deploy -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deploy-demo 3/3 1 3 9m11s nginx nginx:1.18-alpine app=ngx-dep-pod [root@master01 ~]# kubectl get deploy -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deploy-demo 3/3 3 3 9m38s nginx nginx:1.18-alpine app=ngx-dep-pod [root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE deploy-demo-567b54cd6-6h97c 1/1 Running 0 28s deploy-demo-567b54cd6-j74t4 1/1 Running 0 27s deploy-demo-567b54cd6-wcccx 1/1 Running 0 49s replicaset-demo-9wqj9 1/1 Running 0 34m replicaset-demo-j75hk 1/1 Running 0 60m replicaset-demo-k2n9g 1/1 Running 0 56m replicaset-demo-n7fmk 1/1 Running 0 56m replicaset-demo-q4dc6 1/1 Running 0 56m replicaset-demo-rsl7q 1/1 Running 0 92m replicaset-demo-twknl 1/1 Running 0 92m [root@master01 ~]#
提示：可以看到deploy控制器，只要修改了pod模板中镜像的版本，对应pod就会随之滚动更新到我们指定的版本；
查看rs历史版本
[root@master01 ~]# kubectl get rs -o wide NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR deploy-demo-567b54cd6 3 3 3 3m50s nginx nginx:1.18-alpine app=ngx-dep-pod,pod-template-hash=567b54cd6 deploy-demo-6d795f958b 0 0 0 12m nginx nginx:1.14-alpine app=ngx-dep-pod,pod-template-hash=6d795f958b deploy-demo-95cc58f4d 0 0 0 7m27s nginx nginx:1.16-alpine app=ngx-dep-pod,pod-template-hash=95cc58f4d replicaset-demo 7 7 7 95m nginx nginx:1.18-alpine app=nginx-pod [root@master01 ~]#
提示：deploy控制器的更新pod版本操作，它会记录rs的所有历史版本；因为只要pod模板的hash值发生变化，对应的rs就会重新被创建一遍，不同于rs控制器，历史版本的rs上没有pod运行，只有当前版本的rs上才会运行pod；
查看更新历史记录
[root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 1 <none> 2 <none> 3 <none> [root@master01 ~]#
提示：这里可以看到有3个版本，没有记录对应的原因；这是因为我们在更新pod版本是没有记录；要想记录器更新原因，可以在对应名后面加--record选项即可；
示例：记录更新操作命令到更新历史记录
[root@master01 ~]# kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record deployment.apps/deploy-demo image updated [root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 2 <none> 3 <none> 4 kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record=true [root@master01 ~]# kubectl apply -f deploy-demo-nginx-1.16.yaml --record deployment.apps/deploy-demo configured [root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 3 <none> 4 kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record=true 5 kubectl apply --filename=deploy-demo-nginx-1.16.yaml --record=true [root@master01 ~]#
提示：可以看到更新操作时加上--record选项后，再次查看更新历史记录，就能显示对应的更新命令；
回滚到上一个版本
[root@master01 ~]# kubectl get deploy -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deploy-demo 3/3 3 3 33m nginx nginx:1.16-alpine app=ngx-dep-pod [root@master01 ~]# kubectl get rs -o wide NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR deploy-demo-567b54cd6 0 0 0 24m nginx nginx:1.18-alpine app=ngx-dep-pod,pod-template-hash=567b54cd6 deploy-demo-6d795f958b 0 0 0 33m nginx nginx:1.14-alpine app=ngx-dep-pod,pod-template-hash=6d795f958b deploy-demo-95cc58f4d 3 3 3 28m nginx nginx:1.16-alpine app=ngx-dep-pod,pod-template-hash=95cc58f4d replicaset-demo 7 7 7 116m nginx nginx:1.18-alpine app=nginx-pod [root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 3 <none> 4 kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record=true 5 kubectl apply --filename=deploy-demo-nginx-1.16.yaml --record=true [root@master01 ~]# kubectl rollout undo deploy/deploy-demo deployment.apps/deploy-demo rolled back [root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 3 <none> 5 kubectl apply --filename=deploy-demo-nginx-1.16.yaml --record=true 6 kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record=true [root@master01 ~]# kubectl get deploy -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deploy-demo 3/3 3 3 34m nginx nginx:1.14-alpine app=ngx-dep-pod [root@master01 ~]# kubectl get rs -o wide NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR deploy-demo-567b54cd6 0 0 0 26m nginx nginx:1.18-alpine app=ngx-dep-pod,pod-template-hash=567b54cd6 deploy-demo-6d795f958b 3 3 3 35m nginx nginx:1.14-alpine app=ngx-dep-pod,pod-template-hash=6d795f958b deploy-demo-95cc58f4d 0 0 0 29m nginx nginx:1.16-alpine app=ngx-dep-pod,pod-template-hash=95cc58f4d replicaset-demo 7 7 7 118m nginx nginx:1.18-alpine app=nginx-pod [root@master01 ~]#
提示：可以看到执行了kubectl rollout undo deploy/deploy-demo命令后，对应版本从1.16就回滚到1.14的版本了；对应更新历史记录也把1.14版本更新为当前最新记录；
回滚到指定历史记录版本
[root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 3 <none> 5 kubectl apply --filename=deploy-demo-nginx-1.16.yaml --record=true 6 kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record=true [root@master01 ~]# kubectl rollout undo deploy/deploy-demo --to-revision=3 deployment.apps/deploy-demo rolled back [root@master01 ~]# kubectl rollout history deploy/deploy-demo deployment.apps/deploy-demo REVISION CHANGE-CAUSE 5 kubectl apply --filename=deploy-demo-nginx-1.16.yaml --record=true 6 kubectl set image deploy deploy-demo nginx=nginx:1.14-alpine --record=true 7 <none> [root@master01 ~]# kubectl get deploy -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR deploy-demo 3/3 3 3 42m nginx nginx:1.18-alpine app=ngx-dep-pod [root@master01 ~]# kubectl get rs -o wide NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR deploy-demo-567b54cd6 3 3 3 33m nginx nginx:1.18-alpine app=ngx-dep-pod,pod-template-hash=567b54cd6 deploy-demo-6d795f958b 0 0 0 42m nginx nginx:1.14-alpine app=ngx-dep-pod,pod-template-hash=6d795f958b deploy-demo-95cc58f4d 0 0 0 36m nginx nginx:1.16-alpine app=ngx-dep-pod,pod-template-hash=95cc58f4d replicaset-demo 7 7 7 125m nginx nginx:1.18-alpine app=nginx-pod [root@master01 ~]#
提示：指定要回滚到某个历史记录的版本，可以使用--to-revision选项来指定历史记录的编号；
查看deploy控制器的详细信息
[root@master01 ~]# kubectl describe deploy deploy-demo
Name: deploy-demo
Namespace: default
CreationTimestamp: Thu,17 Dec 2020 23:40:11 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 7
Selector: app=ngx-dep-pod
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=ngx-dep-pod
Containers:
nginx:
Image: nginx:1.18-alpine
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: deploy-demo-567b54cd6 (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 58m deployment-controller Scaled down replica set deploy-demo-6d795f958b to 1
Normal ScalingReplicaSet 58m deployment-controller Scaled up replica set deploy-demo-95cc58f4d to 3
Normal ScalingReplicaSet 58m deployment-controller Scaled down replica set deploy-demo-6d795f958b to 0
Normal ScalingReplicaSet 55m deployment-controller Scaled up replica set deploy-demo-567b54cd6 to 1
Normal ScalingReplicaSet 54m deployment-controller Scaled down replica set deploy-demo-95cc58f4d to 2
Normal ScalingReplicaSet 38m deployment-controller Scaled up replica set deploy-demo-6d795f958b to 1
Normal ScalingReplicaSet 38m deployment-controller Scaled down replica set deploy-demo-567b54cd6 to 2
Normal ScalingReplicaSet 38m deployment-controller Scaled up replica set deploy-demo-6d795f958b to 2
Normal ScalingReplicaSet 37m deployment-controller Scaled down replica set deploy-demo-567b54cd6 to 1
Normal ScalingReplicaSet 37m deployment-controller Scaled down replica set deploy-demo-567b54cd6 to 0
Normal ScalingReplicaSet 33m (x2 over 58m) deployment-controller Scaled up replica set deploy-demo-95cc58f4d to 1
Normal ScalingReplicaSet 33m (x2 over 58m) deployment-controller Scaled up replica set deploy-demo-95cc58f4d to 2
Normal ScalingReplicaSet 33m (x2 over 58m) deployment-controller Scaled down replica set deploy-demo-6d795f958b to 2
Normal ScalingReplicaSet 29m (x3 over 64m) deployment-controller Scaled up replica set deploy-demo-6d795f958b to 3
Normal ScalingReplicaSet 22m (x14 over 54m) deployment-controller (combined from similar events): Scaled down replica set deploy-demo-6d795f958b to 2
[root@master01 ~]#
提示：查看deploy控制器的详细信息，可以看到对应pod模板，回滚的过程，以及默认更新策略等等信息；
自定义滚动更新策略
[root@master01 ~]# cat deploy-demo-nginx-1.14.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: deploy-demo
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: ngx-dep-pod
template:
metadata:
labels:
app: ngx-dep-pod
spec:
containers:
- name: nginx
image: nginx:1.14-alpine
ports:
- name: http
containerPort: 80
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 2
maxUnavailable: 1
minReadySeconds: 5
[root@master01 ~]#
提示：定义滚动更新策略需要使用strategy这个字段，这个字段的值是一个对象，其中type是指定更新策略，其策略有两种，第一种是Recreate，这种策略更新方式是新建一个新版pod，然后再删除一个旧版pod以这种方式滚动更新；第二种是RollingUpdate，这种策略是用于我们手动指定的策略；其中maxSurge表示最大允许超出用户期望的pod数量（即更新时允许新建超出用户期望的pod数量），maxUnavailable表示最大允许少于用于期望的pod数量（即更新时可以一次删除几个旧版pod）；最后minReadySeconds字段不是定义更新策略的，它是spec中的一个字段，用于限定pod最小就绪时长；以上更新策略表示，使用RollingUpdate类型策略，并指定最大新建pod超出用户期望pod数量为2个，最大允许少于用户期望pod数量为1个；pod最小就绪时间为5秒；
应用配置清单
[root@master01 ~]# kubectl apply -f deploy-demo-nginx-1.14.yaml
deployment.apps/deploy-demo configured
[root@master01 ~]# kubectl describe deploy/deploy-demo
Name: deploy-demo
Namespace: default
CreationTimestamp: Thu,17 Dec 2020 23:40:11 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 8
Selector: app=ngx-dep-pod
Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 5
RollingUpdateStrategy: 1 max unavailable,2 max surge
Pod Template:
Labels: app=ngx-dep-pod
Containers:
nginx:
Image: nginx:1.14-alpine
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: deploy-demo-6d795f958b (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 47m deployment-controller Scaled up replica set deploy-demo-6d795f958b to 1
Normal ScalingReplicaSet 47m deployment-controller Scaled down replica set deploy-demo-567b54cd6 to 1
Normal ScalingReplicaSet 42m (x2 over 68m) deployment-controller Scaled up replica set deploy-demo-95cc58f4d to 1
Normal ScalingReplicaSet 42m (x2 over 68m) deployment-controller Scaled up replica set deploy-demo-95cc58f4d to 2
Normal ScalingReplicaSet 42m (x2 over 68m) deployment-controller Scaled down replica set deploy-demo-6d795f958b to 2
Normal ScalingReplicaSet 31m (x14 over 64m) deployment-controller (combined from similar events): Scaled down replica set deploy-demo-6d795f958b to 2
Normal ScalingReplicaSet 41s (x4 over 73m) deployment-controller Scaled up replica set deploy-demo-6d795f958b to 3
Normal ScalingReplicaSet 41s (x2 over 47m) deployment-controller Scaled down replica set deploy-demo-567b54cd6 to 2
Normal ScalingReplicaSet 41s (x2 over 47m) deployment-controller Scaled up replica set deploy-demo-6d795f958b to 2
Normal ScalingReplicaSet 34s (x2 over 47m) deployment-controller Scaled down replica set deploy-demo-567b54cd6 to 0
[root@master01 ~]#
提示：可以看到对应deploy控制器的更新策略已经更改为我们定义的策略；为了能够看出更新的效果，我们这里先手动把pod数量调整为10个；
扩展pod副本数量
[root@master01 ~]# kubectl scale deploy/deploy-demo --replicas=10 deployment.apps/deploy-demo scaled [root@master01 ~]# kubectl get pods NAME READY STATUS RESTARTS AGE deploy-demo-6d795f958b-5bdfw 1/1 Running 0 3m33s deploy-demo-6d795f958b-5zr7r 1/1 Running 0 8s deploy-demo-6d795f958b-9mc7k 1/1 Running 0 8s deploy-demo-6d795f958b-czwdp 1/1 Running 0 3m33s deploy-demo-6d795f958b-jfrnc 1/1 Running 0 8s deploy-demo-6d795f958b-jw9n8 1/1 Running 0 3m33s deploy-demo-6d795f958b-mbrlw 1/1 Running 0 8s deploy-demo-6d795f958b-ph99t 1/1 Running 0 8s deploy-demo-6d795f958b-wzscg 1/1 Running 0 8s deploy-demo-6d795f958b-z5mnf 1/1 Running 0 8s replicaset-demo-9wqj9 1/1 Running 0 100m replicaset-demo-j75hk 1/1 Running 0 126m replicaset-demo-k2n9g 1/1 Running 0 123m replicaset-demo-n7fmk 1/1 Running 0 123m replicaset-demo-q4dc6 1/1 Running 0 123m replicaset-demo-rsl7q 1/1 Running 0 159m replicaset-demo-twknl 1/1 Running 0 159m [root@master01 ~]#
查看更新过程
[root@master01 ~]# kubectl get pod -w NAME READY STATUS RESTARTS AGE deploy-demo-6d795f958b-5bdfw 1/1 Running 0 5m18s deploy-demo-6d795f958b-5zr7r 1/1 Running 0 113s deploy-demo-6d795f958b-9mc7k 1/1 Running 0 113s deploy-demo-6d795f958b-czwdp 1/1 Running 0 5m18s deploy-demo-6d795f958b-jfrnc 1/1 Running 0 113s deploy-demo-6d795f958b-jw9n8 1/1 Running 0 5m18s deploy-demo-6d795f958b-mbrlw 1/1 Running 0 113s deploy-demo-6d795f958b-ph99t 1/1 Running 0 113s deploy-demo-6d795f958b-wzscg 1/1 Running 0 113s deploy-demo-6d795f958b-z5mnf 1/1 Running 0 113s replicaset-demo-9wqj9 1/1 Running 0 102m replicaset-demo-j75hk 1/1 Running 0 128m replicaset-demo-k2n9g 1/1 Running 0 125m replicaset-demo-n7fmk 1/1 Running 0 125m replicaset-demo-q4dc6 1/1 Running 0 125m replicaset-demo-rsl7q 1/1 Running 0 161m replicaset-demo-twknl 1/1 Running 0 161m deploy-demo-578d6b6f94-qhc9j 0/1 Pending 0 0s deploy-demo-578d6b6f94-qhc9j 0/1 Pending 0 0s deploy-demo-578d6b6f94-95srs 0/1 Pending 0 0s deploy-demo-6d795f958b-mbrlw 1/1 Terminating 0 4m16s deploy-demo-578d6b6f94-95srs 0/1 Pending 0 0s deploy-demo-578d6b6f94-qhc9j 0/1 ContainerCreating 0 0s deploy-demo-578d6b6f94-95srs 0/1 ContainerCreating 0 0s deploy-demo-578d6b6f94-bht84 0/1 Pending 0 0s deploy-demo-578d6b6f94-bht84 0/1 Pending 0 0s deploy-demo-578d6b6f94-bht84 0/1 ContainerCreating 0 0s deploy-demo-6d795f958b-mbrlw 0/1 Terminating 0 4m17s deploy-demo-6d795f958b-mbrlw 0/1 Terminating 0 4m24s deploy-demo-6d795f958b-mbrlw 0/1 Terminating 0 4m24s deploy-demo-578d6b6f94-qhc9j 1/1 Running 0 15s deploy-demo-578d6b6f94-95srs 1/1 Running 0 16s deploy-demo-578d6b6f94-bht84 1/1 Running 0 18s deploy-demo-6d795f958b-ph99t 1/1 Terminating 0 4m38s deploy-demo-6d795f958b-jfrnc 1/1 Terminating 0 4m38s deploy-demo-578d6b6f94-lg6vk 0/1 Pending 0 0s deploy-demo-578d6b6f94-g9c8x 0/1 Pending 0 0s deploy-demo-578d6b6f94-lg6vk 0/1 Pending 0 0s deploy-demo-578d6b6f94-g9c8x 0/1 Pending 0 0s deploy-demo-578d6b6f94-lg6vk 0/1 ContainerCreating 0 0s deploy-demo-578d6b6f94-g9c8x 0/1 ContainerCreating 0 0s deploy-demo-6d795f958b-ph99t 0/1 Terminating 0 4m38s deploy-demo-6d795f958b-jfrnc 0/1 Terminating 0 4m38s deploy-demo-6d795f958b-5zr7r 1/1 Terminating 0 4m43s deploy-demo-578d6b6f94-4rpx9 0/1 Pending 0 0s deploy-demo-578d6b6f94-4rpx9 0/1 Pending 0 0s deploy-demo-578d6b6f94-4rpx9 0/1 ContainerCreating 0 0s deploy-demo-6d795f958b-5zr7r 0/1 Terminating 0 4m43s deploy-demo-6d795f958b-ph99t 0/1 Terminating 0 4m44s deploy-demo-6d795f958b-ph99t 0/1 Terminating 0 4m44s deploy-demo-6d795f958b-jfrnc 0/1 Terminating 0 4m44s deploy-demo-6d795f958b-jfrnc 0/1 Terminating 0 4m44s deploy-demo-578d6b6f94-g9c8x 1/1 Running 0 12s deploy-demo-6d795f958b-5zr7r 0/1 Terminating 0 4m51s deploy-demo-6d795f958b-5zr7r 0/1 Terminating 0 4m51s deploy-demo-578d6b6f94-lg6vk 1/1 Running 0 15s deploy-demo-6d795f958b-9mc7k 1/1 Terminating 0 4m56s deploy-demo-578d6b6f94-4lbwg 0/1 Pending 0 0s deploy-demo-578d6b6f94-4lbwg 0/1 Pending 0 0s deploy-demo-578d6b6f94-4lbwg 0/1 ContainerCreating 0 0s deploy-demo-578d6b6f94-4rpx9 1/1 Running 0 13s deploy-demo-6d795f958b-9mc7k 0/1 Terminating 0 4m57s deploy-demo-578d6b6f94-4lbwg 1/1 Running 0 2s deploy-demo-6d795f958b-wzscg 1/1 Terminating 0 4m58s deploy-demo-578d6b6f94-fhkk9 0/1 Pending 0 0s deploy-demo-578d6b6f94-fhkk9 0/1 Pending 0 0s deploy-demo-578d6b6f94-fhkk9 0/1 ContainerCreating 0 0s deploy-demo-6d795f958b-wzscg 0/1 Terminating 0 4m59s deploy-demo-578d6b6f94-fhkk9 1/1 Running 0 2s deploy-demo-6d795f958b-z5mnf 1/1 Terminating 0 5m2s deploy-demo-578d6b6f94-sfpz4 0/1 Pending 0 1s deploy-demo-578d6b6f94-sfpz4 0/1 Pending 0 1s deploy-demo-6d795f958b-czwdp 1/1 Terminating 0 8m28s deploy-demo-578d6b6f94-sfpz4 0/1 ContainerCreating 0 1s deploy-demo-578d6b6f94-5bs6z 0/1 Pending 0 0s deploy-demo-578d6b6f94-5bs6z 0/1 Pending 0 0s deploy-demo-578d6b6f94-5bs6z 0/1 ContainerCreating 0 0s deploy-demo-6d795f958b-czwdp 0/1 Terminating 0 8m28s deploy-demo-6d795f958b-z5mnf 0/1 Terminating 0 5m4s deploy-demo-578d6b6f94-sfpz4 1/1 Running 0 2s deploy-demo-6d795f958b-5bdfw 1/1 Terminating 0 8m29s deploy-demo-6d795f958b-9mc7k 0/1 Terminating 0 5m4s deploy-demo-6d795f958b-9mc7k 0/1 Terminating 0 5m4s deploy-demo-578d6b6f94-5bs6z 1/1 Running 0 1s deploy-demo-6d795f958b-5bdfw 0/1 Terminating 0 8m30s deploy-demo-6d795f958b-czwdp 0/1 Terminating 0 8m36s deploy-demo-6d795f958b-czwdp 0/1 Terminating 0 8m36s deploy-demo-6d795f958b-5bdfw 0/1 Terminating 0 8m36s deploy-demo-6d795f958b-5bdfw 0/1 Terminating 0 8m36s deploy-demo-6d795f958b-wzscg 0/1 Terminating 0 5m11s deploy-demo-6d795f958b-wzscg 0/1 Terminating 0 5m11s deploy-demo-6d795f958b-jw9n8 1/1 Terminating 0 8m38s deploy-demo-6d795f958b-jw9n8 0/1 Terminating 0 8m38s deploy-demo-6d795f958b-z5mnf 0/1 Terminating 0 5m14s deploy-demo-6d795f958b-z5mnf 0/1 Terminating 0 5m14s deploy-demo-6d795f958b-jw9n8 0/1 Terminating 0 8m46s deploy-demo-6d795f958b-jw9n8 0/1 Terminating 0 8m46s
提示：使用-w选项可以一直跟踪查看pod变化过程；从上面的监控信息可以看到，在更新时，首先是将三个pod标记为pending状态，然后先删除一个pod，然后再创建两个pod；然后又创建一个，再删除3个，一次进行；不管怎么删除和新建，对应新旧pod的数量最少要有9个，最大不超过12个；
使用暂停更新实现金丝雀发布
[root@master01 ~]# kubectl set image deploy/deploy-demo nginx=nginx:1.14-alpine && kubectl rollout pause deploy/deploy-demo deployment.apps/deploy-demo image updated deployment.apps/deploy-demo paused [root@master01 ~]#
提示：以上命令会根据我们定义的更新策略，先删除一个pod，然后再创建3个新版pod，然后更新操作就暂停了；此时对应pod只更新了1个，然后新建了2个新pod，总共就有12个pod；
查看pod情况
[root@master01 ~]# kubectl get pod NAME READY STATUS RESTARTS AGE deploy-demo-6d795f958b-df77k 1/1 Running 0 87s deploy-demo-6d795f958b-tll8b 1/1 Running 0 87s deploy-demo-6d795f958b-zbhwp 1/1 Running 0 87s deploy-demo-fb957b9b-44l6g 1/1 Running 0 3m21s deploy-demo-fb957b9b-7q6wh 1/1 Running 0 3m38s deploy-demo-fb957b9b-d45rg 1/1 Running 0 3m27s deploy-demo-fb957b9b-j7p2j 1/1 Running 0 3m38s deploy-demo-fb957b9b-mkpz6 1/1 Running 0 3m38s deploy-demo-fb957b9b-qctnv 1/1 Running 0 3m21s deploy-demo-fb957b9b-rvrtf 1/1 Running 0 3m27s deploy-demo-fb957b9b-wf254 1/1 Running 0 3m12s deploy-demo-fb957b9b-xclhz 1/1 Running 0 3m22s replicaset-demo-9wqj9 1/1 Running 0 135m replicaset-demo-j75hk 1/1 Running 0 161m replicaset-demo-k2n9g 1/1 Running 0 158m replicaset-demo-n7fmk 1/1 Running 0 158m replicaset-demo-q4dc6 1/1 Running 0 158m replicaset-demo-rsl7q 1/1 Running 0 3h14m replicaset-demo-twknl 1/1 Running 0 3h14m [root@master01 ~]# kubectl get pod|grep "^deploy.*" |wc -l 12 [root@master01 ~]#
提示：之所以多两个是因为我们在更新策略中定义允许最大超出用户期望2个pod；
恢复更新
[root@master01 ~]# kubectl rollout resume deploy/deploy-demo && kubectl rollout status deploy/deploy-demo deployment.apps/deploy-demo resumed Waiting for deployment "deploy-demo" rollout to finish: 3 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 6 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 6 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 6 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 6 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 6 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 6 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 out of 10 new replicas have been updated... Waiting for deployment "deploy-demo" rollout to finish: 9 of 10 updated replicas are available... Waiting for deployment "deploy-demo" rollout to finish: 9 of 10 updated replicas are available... deployment "deploy-demo" successfully rolled out [root@master01 ~]#
提示：resume表示恢复刚才暂停的更新操作；status是用来查看对应更新过程；
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