7.1 实践
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: httpd
spec:
replicas: 3
template:
metadata:
labels:
run: httpd
spec:
containers:
- name: httpd
image: httpd:2.2.31
ports:
- containerPort: 80
使用 kubectl apply 进行部署。
kubeusr@GalaxyKubernetesMaster:~$ kubectl get deployment httpd -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
httpd 3 3 3 2 3m httpd httpd:2.2.31 run=httpd
kubeusr@GalaxyKubernetesMaster:~$ kubectl get replicaset -o wide
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
busybox-577868d55b 1 1 1 1d busybox busybox pod-template-hash=1334248116,run=busybox
httpd-9658687dd 3 3 2 4m httpd httpd:2.2.31 pod-template-hash=521424388,run=httpd
然后将配置文件中的2.2.31 替换为 2.2.32，再执行kubectl apply,
kubeusr@GalaxyKubernetesMaster:~$ kubectl get deployment -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
busybox 1 1 1 1 1d busybox busybox run=busybox
httpd 3 4 2 3 11m httpd httpd:2.2.32 run=httpd # 更新成了新版本 kubeusr@GalaxyKubernetesMaster:~$ kubectl get replicaset -o wide
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
busybox-577868d55b 1 1 1 1d busybox busybox pod-template-hash=1334248116,run=busybox
httpd-76c8bd9f65 2 2 1 5m httpd httpd:2.2.32 pod-template-hash=3274685921,run=httpd
httpd-9658687dd 2 2 2 12m httpd httpd:2.2.31 pod-template-hash=521424388,run=httpd
kubeusr@GalaxyKubernetesMaster:~$ kubectl describe deployment httpd
Name: httpd
Namespace: default
CreationTimestamp: Sun, 30 Dec 2018 07:37:56 -0500
Labels: run=httpd
Annotations: deployment.kubernetes.io/revision=2
kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"apps/v1beta1","kind":"Deployment","metadata":{"annotations":{},"name":"httpd","namespace":"default"},"spec":{"replicas":2,"template":{"m...
Selector: run=httpd
Replicas: 2 desired | 2 updated | 3 total | 2 available | 1 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: run=httpd
Containers:
httpd:
Image: httpd:2.2.32
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True ReplicaSetUpdated
OldReplicaSets: httpd-9658687dd (1/1 replicas created)
NewReplicaSet: httpd-76c8bd9f65 (2/2 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 12m deployment-controller Scaled up replica set httpd-9658687dd to 2
Normal ScalingReplicaSet 53s deployment-controller Scaled up replica set httpd-76c8bd9f65 to 1
Normal ScalingReplicaSet 42s deployment-controller Scaled down replica set httpd-9658687dd to 1
Normal ScalingReplicaSet 42s deployment-controller Scaled up replica set httpd-76c8bd9f65 to 2
7.2 回滚
httpd.v1.yml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: httpd
spec:
revisionHistoryLimit: 10
replicas: 3
template:
metadata:
labels:
run: httpd
spec:
containers:
- name: httpd
image: httpd:2.4.16
ports:
- containerPort: 80
httpd.v2.yml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: httpd
spec:
revisionHistoryLimit: 10
replicas: 3
template:
metadata:
labels:
run: httpd
spec:
containers:
- name: httpd
image: httpd:2.4.17
ports:
- containerPort: 80
httpd.v3.yml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: httpd
spec:
revisionHistoryLimit: 10
replicas: 3
template:
metadata:
labels:
run: httpd
spec:
containers:
- name: httpd
image: httpd:2.4.18
ports:
- containerPort: 80
kubeusr@GalaxyKubernetesMaster:~$ kubectl apply -f httpd.v1.yml --record # record的作用是将命令记录到revision记录中。
deployment.apps "httpd" configured
kubeusr@GalaxyKubernetesMaster:~$ kubectl get deployment httpd -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
httpd 3 4 2 3 20m httpd httpd:2.4.16 run=httpd
kubeusr@GalaxyKubernetesMaster:~$ kubectl apply -f httpd.v2.yml --record
deployment.apps "httpd" configured
kubeusr@GalaxyKubernetesMaster:~$ kubectl get deployment httpd -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
httpd 3 4 1 3 28m httpd httpd:2.4.17 run=httpd
kubeusr@GalaxyKubernetesMaster:~$ kubectl apply -f httpd.v3.yml --record
deployment.apps "httpd" configured
kubeusr@GalaxyKubernetesMaster:~$ kubectl get deployment httpd -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
httpd 3 4 2 3 29m httpd httpd:2.4.18 run=httpd # 查看历史部署版本
kubeusr@GalaxyKubernetesMaster:~$ kubectl rollout history deployment httpd deployments "httpd"
REVISION CHANGE-CAUSE
1 <none> # 因为之前部署命令中没有record，所以就显示 <none>
2 <none>
3 kubectl apply --filename=httpd.v1.yml --record=true
4 kubectl apply --filename=httpd.v2.yml --record=true
5 kubectl apply --filename=httpd.v3.yml --record=true
如果想回滚到某个版本：
kubeusr@GalaxyKubernetesMaster:~$ kubectl rollout undo deployment httpd --to-revision=3 # 回退到revision=3的那个版本
deployment.apps "httpd"
kubeusr@GalaxyKubernetesMaster:~$ kubectl get deployment httpd -o wide
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
httpd 3 4 2 3 37m httpd httpd:2.4.16 run=httpd