kubernetes 之 Rolling Update 滚动升级
作者：互联网
滚动升级
1、错误的yml文件
[machangwei@mcwk8s-master ~]$ cat mcwHttpd.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: mcw-httpd
spec:
replicas: 3
selector:
matchLabels:
run: mcw-httpd
template:
metadata:
labels:
run: mcw-httpd
spec:
containers:
- name: mcw-httpd
image: httpd
ports:
- containerPort: 80
[machangwei@mcwk8s-master ~]$ vim mcwHttpd.yml
[machangwei@mcwk8s-master ~]$ cat mcwHttpd.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: mcw-httpd
spec:
replicas: 3
selector:
matchLabels:
run: mcw-httpd
template:
metadata:
labels:
run: mcw-httpd
spec:
containers:
- name: mcw-httpd
image: :httpd:2.2.31
ports:
- containerPort: 80
[machangwei@mcwk8s-master ~]$ kubectl apply -f mcwHttpd.yml
deployment.apps/mcw-httpd created
[machangwei@mcwk8s-master ~]$ kubectl get deployment httpd -o wide
Error from server (NotFound): deployments.apps "httpd" not found
[machangwei@mcwk8s-master ~]$ kubectl get deployment -o wide
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
mcw-httpd 0/3 3 0 33s mcw-httpd :httpd:2.2.31 run=mcw-httpd
[machangwei@mcwk8s-master ~]$ kubectl get pod
NAME READY STATUS RESTARTS AGE
mcw-httpd-6644b55f8c-62dvc 0/1 InvalidImageName 0 98s
mcw-httpd-6644b55f8c-h8pfn 0/1 InvalidImageName 0 98s
mcw-httpd-6644b55f8c-xn259 0/1 InvalidImageName 0 98s
[machangwei@mcwk8s-master ~]$
2、修改为正确的yml文件，部署deployment
[machangwei@mcwk8s-master ~]$ vim mcwHttpd.yml
[machangwei@mcwk8s-master ~]$ cat mcwHttpd.yml #其它跟以前的没变，只是镜像后面加了冒号和数字，也就是添加了版本
apiVersion: apps/v1
kind: Deployment
metadata:
name: mcw-httpd
spec:
replicas: 3
selector:
matchLabels:
run: mcw-httpd
template:
metadata:
labels:
run: mcw-httpd
spec:
containers:
- name: mcw-httpd
image: httpd:2.2.31
ports:
- containerPort: 80
[machangwei@mcwk8s-master ~]$ kubectl delete -f mcwHttpd.yml #把以前的删除
deployment.apps "mcw-httpd" deleted
[machangwei@mcwk8s-master ~]$
[machangwei@mcwk8s-master ~]$ kubectl apply -f mcwHttpd.yml #部署deployment
deployment.apps/mcw-httpd created
[machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide #查看镜像是31的镜像
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
mcw-httpd 3/3 3 3 13s mcw-httpd httpd:2.2.31 run=mcw-httpd
[machangwei@mcwk8s-master ~]$ kubectl get replicaset -o wide #查看副本集这里，也是31的镜像
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
mcw-httpd-6f64bbcfcf 3 3 3 40s mcw-httpd httpd:2.2.31 pod-template-hash=6f64bbcfcf,run=mcw-httpd
[machangwei@mcwk8s-master ~]$ kubectl get pod -o wide #查看pod部署情况
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mcw-httpd-6f64bbcfcf-5nhxc 1/1 Running 0 70s 10.244.2.9 mcwk8s-node2 <none> <none>
mcw-httpd-6f64bbcfcf-s8hng 1/1 Running 0 70s 10.244.1.7 mcwk8s-node1 <none> <none>
mcw-httpd-6f64bbcfcf-t6j2f 1/1 Running 0 70s 10.244.2.8 mcwk8s-node2 <none> <none>
3、修改镜像版本号，重新部署，滚动升级
[machangwei@mcwk8s-master ~]$ vim mcwHttpd.yml
[machangwei@mcwk8s-master ~]$ cat mcwHttpd.yml #修改版本号为：2.2.32
apiVersion: apps/v1
kind: Deployment
metadata:
name: mcw-httpd
spec:
replicas: 3
selector:
matchLabels:
run: mcw-httpd
template:
metadata:
labels:
run: mcw-httpd
spec:
containers:
- name: mcw-httpd
image: httpd:2.2.32
ports:
- containerPort: 80
[machangwei@mcwk8s-master ~]$ kubectl apply -f mcwHttpd.yml #重新部署
deployment.apps/mcw-httpd configured
[machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide #查看deployment镜像已经修改，更新了一个好像是
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
mcw-httpd 3/3 1 3 6m58s mcw-httpd httpd:2.2.32 run=mcw-httpd
[machangwei@mcwk8s-master ~]$ kubectl get replicaset -o wide #查看副本集，32是新建的副本集，镜像改为32了。这里还没有升级完，32镜像只有一个是ready，也就是刚刚升级完一个
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
mcw-httpd-6f64bbcfcf 2 2 2 7m5s mcw-httpd httpd:2.2.31 pod-template-hash=6f64bbcfcf,run=mcw-httpd
mcw-httpd-7c977464db 2 2 1 10s mcw-httpd httpd:2.2.32 pod-template-hash=7c977464db,run=mcw-httpd
[machangwei@mcwk8s-master ~]$
[machangwei@mcwk8s-master ~]$ kubectl get pod -o wide #查看pod。根据年龄查看，刚刚生成三个新的，旧的还有一个没有被删除
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mcw-httpd-6f64bbcfcf-s8hng 1/1 Terminating 0 7m16s 10.244.1.7 mcwk8s-node1 <none> <none>
mcw-httpd-7c977464db-5ctkr 1/1 Running 0 21s 10.244.1.8 mcwk8s-node1 <none> <none>
mcw-httpd-7c977464db-bfz6t 1/1 Running 0 10s 10.244.1.9 mcwk8s-node1 <none> <none>
mcw-httpd-7c977464db-gp94c 1/1 Running 0 12s 10.244.2.10 mcwk8s-node2 <none> <none>
[machangwei@mcwk8s-master ~]$
[machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide #再次查看，已经升级完三个了
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
mcw-httpd 3/3 3 3 7m36s mcw-httpd httpd:2.2.32 run=mcw-httpd
[machangwei@mcwk8s-master ~]$ kubectl get replicaset -o wide #再次查看副本集，三个副本都已经被新生成副本代替了，
#新生成的副本是 32的镜像。而且旧的副本集副本个数为0了，但是它不会删除过了九分钟都还没有删除，应该是不删的
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
mcw-httpd-6f64bbcfcf 0 0 0 7m47s mcw-httpd httpd:2.2.31 pod-template-hash=6f64bbcfcf,run=mcw-httpd
mcw-httpd-7c977464db 3 3 3 52s mcw-httpd httpd:2.2.32 pod-template-hash=7c977464db,run=mcw-httpd
[machangwei@mcwk8s-master ~]$ kubectl get pod -o wide #查看pod，已经只有最新生成的镜像是32版本的pod了
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mcw-httpd-7c977464db-5ctkr 1/1 Running 0 57s 10.244.1.8 mcwk8s-node1 <none> <none>
mcw-httpd-7c977464db-bfz6t 1/1 Running 0 46s 10.244.1.9 mcwk8s-node1 <none> <none>
mcw-httpd-7c977464db-gp94c 1/1 Running 0 48s 10.244.2.10 mcwk8s-node2 <none> <none>
4、查看滚动升级详情
[machangwei@mcwk8s-master ~]$ kubectl get replicaset -o wide #查看副本集 NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR mcw-httpd-6f64bbcfcf 0 0 0 21m mcw-httpd httpd:2.2.31 pod-template-hash=6f64bbcfcf,run=mcw-httpd mcw-httpd-7c977464db 3 3 3 14m mcw-httpd httpd:2.2.32 pod-template-hash=7c977 [machangwei@mcwk8s-master ~]$ kubectl get deployment -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR mcw-httpd 3/3 3 3 19m mcw-httpd httpd:2.2.32 run=mcw-httpd [machangwei@mcwk8s-master ~]$ kubectl describe deployment mcw-httpd Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable #副本三个被更新的 Image: httpd:2.2.32 容器镜像是32 Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal ScalingReplicaSet 19m deployment-controller Scaled up replica set mcw-httpd-6f64bbcfcf to 3 Normal ScalingReplicaSet 12m deployment-controller Scaled up replica set mcw-httpd-7c977464db to 1 Normal ScalingReplicaSet 12m deployment-controller Scaled down replica set mcw-httpd-6f64bbcfcf to 2 Normal ScalingReplicaSet 12m deployment-controller Scaled up replica set mcw-httpd-7c977464db to 2 Normal ScalingReplicaSet 12m deployment-controller Scaled down replica set mcw-httpd-6f64bbcfcf to 1 Normal ScalingReplicaSet 12m deployment-controller Scaled up replica set mcw-httpd-7c977464db to 3 Normal ScalingReplicaSet 12m deployment-controller Scaled down replica set mcw-httpd-6f64bbcfcf to 0 每只更新替换一个pod： mcw-httpd-6f64bbcfcf to 3 旧副本集是3个pod mcw-httpd-7c977464db to 1 新副本集增加一个pod，总数为1 mcw-httpd-6f64bbcfcf to 2 旧副本集减少一个pod，总数为2 mcw-httpd-7c977464db to 2 新副本集增加一个pod，总数为2 mcw-httpd-6f64bbcfcf to 1 旧副本集减少一个pod，总数为1 mcw-httpd-7c977464db to 3 新副本集增加一个pod，总数为3 mcw-httpd-6f64bbcfcf to 0 旧副本集减少一个pod，总数为0 每次替换的POD数量是可以定制的。默认应该是1吧。定制的参数有两个，如：maxSurge ,maxUnavailable 来精细控制POD的替换数量
回滚
1、回滚前的模拟准备环境
模拟新建三个需要的版本。
[root@mcwk8s-node2 ~]$ docker tag httpd:latest httpd:2.4.16
[root@mcwk8s-node2 ~]$ docker tag httpd:latest httpd:2.4.17
[root@mcwk8s-node2 ~]$ docker tag httpd:latest httpd:2.4.18
创文件文件，并修改版本
[machangwei@mcwk8s-master ~]$ cp mcwHttpd.yml mcw.httpd.v1.yml
[machangwei@mcwk8s-master ~]$ cp mcwHttpd.yml mcw.httpd.v2.yml
[machangwei@mcwk8s-master ~]$ cp mcwHttpd.yml mcw.httpd.v3.yml
修改一下文件，将镜像分别修改为 16,17,18
[machangwei@mcwk8s-master ~]$ ls mcw.httpd.v1
mcw.httpd.v16.yml mcw.httpd.v17.yml mcw.httpd.v18.yml
[machangwei@mcwk8s-master ~]$ cat mcw.httpd.v16.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: mcw-httpd
spec:
replicas: 3
selector:
matchLabels:
run: mcw-httpd
template:
metadata:
labels:
run: mcw-httpd
spec:
containers:
- name: mcw-httpd
image: httpd:2.4.16
ports:
- containerPort: 80
2、部署并回滚
[machangwei@mcwk8s-master ~]$ ls mcw.httpd.v1 #查看所有yml配置文件 mcw.httpd.v16.yml mcw.httpd.v17.yml mcw.httpd.v18.yml [machangwei@mcwk8s-master ~]$ kubectl apply -f mcw.httpd.v16.yml --record #--record，将当前命令记录到revision记录中 Flag --record has been deprecated, --record will be removed in the future #这样我们就能知道每个revison对应的是哪个配置文件了 deployment.apps/mcw-httpd created [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR mcw-httpd 3/3 3 3 2m3s mcw-httpd httpd:2.4.16 run=mcw-httpd [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl apply -f mcw.httpd.v17.yml --record Flag --record has been deprecated, --record will be removed in the future deployment.apps/mcw-httpd configured [machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide #每次执行都被更新镜像版本了 NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR mcw-httpd 3/3 3 3 2m35s mcw-httpd httpd:2.4.17 run=mcw-httpd [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl apply -f mcw.httpd.v18.yml --record Flag --record has been deprecated, --record will be removed in the future deployment.apps/mcw-httpd configured [machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR mcw-httpd 3/3 2 3 2m54s mcw-httpd httpd:2.4.18 run=mcw-httpd [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl rollout history deployment mcw-httpd #--record，将当前命令记录到revision记录中 deployment.apps/mcw-httpd REVISION CHANGE-CAUSE #这样我们就能知道每个revison对应的是哪个配置文件了 #查看revison历史记录 1 kubectl apply --filename=mcw.httpd.v16.yml --record=true 2 kubectl apply --filename=mcw.httpd.v17.yml --record=true 3 kubectl apply --filename=mcw.httpd.v18.yml --record=true [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl rollout undo deployment mcw-httpd --to-revision=1 #执行命令回滚到版本1。 deployment.apps/mcw-httpd rolled back [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl get deployment mcw-httpd -o wide #查看镜像已经改成版本1的了 NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR mcw-httpd 3/3 3 3 4m39s mcw-httpd httpd:2.4.16 run=mcw-httpd [machangwei@mcwk8s-master ~]$ [machangwei@mcwk8s-master ~]$ kubectl rollout history deployment mcw-httpd #查看revison历史记录的变化 deployment.apps/mcw-httpd REVISION CHANGE-CAUSE 2 kubectl apply --filename=mcw.httpd.v17.yml --record=true 3 kubectl apply --filename=mcw.httpd.v18.yml --record=true 4 kubectl apply --filename=mcw.httpd.v16.yml --record=true #revison 1 变成了revison4，我们可以通过CHANG-CAUSE #知道每个revison的具体含义，所以要在执行kubectl 加上参数 --record [machangwei@mcwk8s-master ~]$
标签：httpd,kubernetes,kubectl,machangwei,Update,mcw,master,mcwk8s,Rolling 来源： https://www.cnblogs.com/machangwei-8/p/15832266.html