kubernetes(8)：新副本控制器—deployment

新副本控制器—deployment

https://www.cnblogs.com/luoahong/p/10302601.html

https://jimmysong.io/kubernetes-handbook/concepts/deployment.html

http://www.bubuko.com/infodetail-2612308.html

1 Deployment简介

Deployment主要职责同样是为了保证pod的数量和健康，90%的功能与Replication Controller完全一样，可以看做新一代的Replication Controller。但是，它又具备了Replication Controller之外的新特性：

  • Replication Controller全部功能：Deployment继承了上面描述的Replication Controller全部功能。
  • 事件和状态查看：可以查看Deployment的升级详细进度和状态。
  • 回滚：当升级pod镜像或者相关参数的时候发现问题，可以使用回滚操作回滚到上一个稳定的版本或者指定的版本。
  • 版本记录: 每一次对Deployment的操作，都能保存下来，给予后续可能的回滚使用。
  • 暂停和启动：对于每一次升级，都能够随时暂停和启动。
  • 多种升级方案：Recreate：删除所有已存在的pod,重新创建新的; RollingUpdate：滚动升级，逐步替换的策略，同时滚动升级时，支持更多的附加参数，例如设置最大不可用pod数量，最小升级间隔时间等等。

2 通过文件创建deployment

2.1 创建deployment文件

#[root@k8s-master k8s]# cat nginx-deployment.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 192.168.0.136:5000/nginx:1.15
        ports:
        - containerPort: 80

 


 

2.2 启动deployment

[root@k8s-master k8s]# kubectl create -f nginx-deployment.yaml 
deployment "nginx-deployment" created
[root@k8s-master k8s]#
[root@k8s-master k8s]# kubectl get pods -o wide
NAME                                READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment-4019830974-6lbk9   1/1       Running   0          22s       172.16.47.2   k8s-node-2
nginx-deployment-4019830974-8wb75   1/1       Running   0          22s       172.16.73.3   k8s-node-1
nginx-deployment-4019830974-drn36   1/1       Running   0          22s       172.16.73.2   k8s-node-1
[root@k8s-master k8s]#

 

2.3 查看deployment状态

 

[root@k8s-master k8s]# kubectl get all
NAME                      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/nginx-deployment   3         3         3            3           58s

NAME             CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
svc/kubernetes   10.254.0.1   <none>        443/TCP   2d

NAME                             DESIRED   CURRENT   READY     AGE
rs/nginx-deployment-4019830974   3         3         3         58s

NAME                                   READY     STATUS    RESTARTS   AGE
po/nginx-deployment-4019830974-6lbk9   1/1       Running   0          58s
po/nginx-deployment-4019830974-8wb75   1/1       Running   0          58s
po/nginx-deployment-4019830974-drn36   1/1       Running   0          58s
[root@k8s-master k8s]# kubectl get rs
NAME                          DESIRED   CURRENT   READY     AGE
nginx-deployment-4019830974   3         3         3         1m
[root@k8s-master k8s]# kubectl get pods -o wide
NAME                                READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment-4019830974-6lbk9   1/1       Running   0          1m        172.16.47.2   k8s-node-2
nginx-deployment-4019830974-8wb75   1/1       Running   0          1m        172.16.73.3   k8s-node-1
nginx-deployment-4019830974-drn36   1/1       Running   0          1m        172.16.73.2   k8s-node-1
[root@k8s-master k8s]#
[root@k8s-master k8s]# kubectl get deployment 
NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3         3         3            3           8s
[root@k8s-master k8s]#

 

kubectl get deployments的输出，其含义：

  • DESIRED : Pod副本数量的期望值，即Deployment里定义的Replica。
  • CURRENT： 当前实际的Replica数量，当这个值不断增加，达到DESIRED时表明部署完成。
  • UP-TO-DATE：最新版本的Pod副本数量，用于指示在滚动升级过程中有多少Pod副本已经成功升级。
  • AVAILABLE: 当前集群中可用的Pod副本数量（当前存活的Pod数量）

 

2.4 自动加载deployment配置

deployment编辑配置之后可以自动加载，不想rc还需要删除再启动。

执行 edit命令修改Deployment配置，修改了副本数量和image地址

 

[root@k8s-master k8s]# kubectl edit deployment nginx-deployment 
deployment "nginx-deployment" edited
[root@k8s-master k8s]# kubectl get pods -o wide
NAME                                READY     STATUS              RESTARTS   AGE       IP            NODE
nginx-deployment-2562048646-1pscs   0/1       ContainerCreating   0          3s        <none>        k8s-node-1
nginx-deployment-2562048646-h9fvj   0/1       ContainerCreating   0          3s        <none>        k8s-node-2
nginx-deployment-4019830974-1ctkn   0/1       ContainerCreating   0          4s        <none>        k8s-node-2
nginx-deployment-4019830974-6lbk9   1/1       Running             0          4m        172.16.47.2   k8s-node-2
nginx-deployment-4019830974-8wb75   1/1       Running             0          4m        172.16.73.3   k8s-node-1
nginx-deployment-4019830974-drn36   1/1       Running             0          4m        172.16.73.2   k8s-node-1
nginx-deployment-4019830974-tmw2r   0/1       Terminating         0          4s        <none>        k8s-node-1
[root@k8s-master k8s]# 
[root@k8s-master k8s]# kubectl get pods -o wide
NAME                                READY     STATUS              RESTARTS   AGE       IP            NODE
nginx-deployment-2562048646-1pscs   0/1       ContainerCreating   0          17s       <none>        k8s-node-1
nginx-deployment-2562048646-h9fvj   0/1       ContainerCreating   0          17s       <none>        k8s-node-2
nginx-deployment-4019830974-1ctkn   1/1       Running             0          18s       172.16.47.3   k8s-node-2
nginx-deployment-4019830974-6lbk9   1/1       Running             0          4m        172.16.47.2   k8s-node-2
nginx-deployment-4019830974-8wb75   1/1       Running             0          4m        172.16.73.3   k8s-node-1
nginx-deployment-4019830974-drn36   1/1       Running             0          4m        172.16.73.2   k8s-node-1
nginx-deployment-4019830974-tmw2r   0/1       Terminating         0          18s       <none>        k8s-node-1
[root@k8s-master k8s]# kubectl get pods -o wide
NAME                                READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment-2562048646-1pscs   1/1       Running   0          27s       172.16.73.5   k8s-node-1
nginx-deployment-2562048646-h9fvj   1/1       Running   0          27s       172.16.47.4   k8s-node-2
nginx-deployment-2562048646-j3bd4   1/1       Running   0          10s       172.16.47.5   k8s-node-2
nginx-deployment-2562048646-rv9nk   1/1       Running   0          4s        172.16.47.3   k8s-node-2
nginx-deployment-2562048646-wnnd2   1/1       Running   0          4s        172.16.73.4   k8s-node-1
[root@k8s-master k8s]# kubectl get rs
NAME                          DESIRED   CURRENT   READY     AGE
nginx-deployment-2562048646   5         5         5         3m
nginx-deployment-4019830974   0         0         0         7m
[root@k8s-master k8s]#

[root@k8s-master k8s]# curl -I 172.16.47.4
HTTP/1.1 200 OK
Server: nginx/1.17.3
Date: Thu, 22 Aug 2019 08:21:48 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 13 Aug 2019 08:50:00 GMT
Connection: keep-alive
ETag: "5d5279b8-264"
Accept-Ranges: bytes

[root@k8s-master k8s]#

 

2.5 删除deployment

[root@k8s-master k8s]# kubectl delete deployment nginx-deployment 
deployment "nginx-deployment" deleted
[root@k8s-master k8s]# kubectl get rs
No resources found.
[root@k8s-master k8s]# kubectl get pods
No resources found.
[root@k8s-master k8s]#

 

3 通过命令行创建deployment

3.1 命令行创建

[root@k8s-master k8s]# kubectl run nginx-deployment2 --image=192.168.0.136:5000/nginx:1.15 --replicas=5 --record                 
deployment "nginx-deployment2" created

 

3.2 查看deployment状态

[root@k8s-master k8s]# kubectl get deployment nginx-deployment2                                                 
NAME                DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment2   5         5         5            5           10s
[root@k8s-master k8s]# kubectl get rs
NAME                           DESIRED   CURRENT   READY     AGE
nginx-deployment2-3516246156   5         5         5         18s
[root@k8s-master k8s]# kubectl get pods -o wide
NAME                                 READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment2-3516246156-1h8g5   1/1       Running   0          32s       172.16.47.4   k8s-node-2
nginx-deployment2-3516246156-4cjck   1/1       Running   0          32s       172.16.47.3   k8s-node-2
nginx-deployment2-3516246156-bmlk3   1/1       Running   0          32s       172.16.47.2   k8s-node-2
nginx-deployment2-3516246156-h0ncj   1/1       Running   0          32s       172.16.73.3   k8s-node-1
nginx-deployment2-3516246156-r73n7   1/1       Running   0          32s       172.16.73.2   k8s-node-1
[root@k8s-master k8s]# curl -I 172.16.47.3
HTTP/1.1 200 OK
Server: nginx/1.15.12
Date: Thu, 22 Aug 2019 08:32:20 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 16 Apr 2019 13:08:19 GMT
Connection: keep-alive
ETag: "5cb5d3c3-264"
Accept-Ranges: bytes

[root@k8s-master k8s]#

3.3 手动扩容缩容

#kubectl scale deployment DeploymentName --replicas=NUM
[root@k8s-master ~]# kubectl get deployment nginx-deployment2 
NAME                DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment2   5         5         5            5           16m
[root@k8s-master ~]# kubectl scale deployment nginx-deployment2 --replicas=8
deployment "nginx-deployment2" scaled
[root@k8s-master ~]# kubectl get deployment nginx-deployment2               
NAME                DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment2   8         8         8            8           17m
[root@k8s-master ~]# kubectl get pods -o wide                       
NAME                                 READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment2-3766659668-2dl98   1/1       Running   0          9m        172.16.47.4   k8s-node-2
nginx-deployment2-3766659668-57p0w   1/1       Running   0          9m        172.16.73.5   k8s-node-1
nginx-deployment2-3766659668-c1lx6   1/1       Running   0          9m        172.16.47.3   k8s-node-2
nginx-deployment2-3766659668-f9rc6   1/1       Running   0          9m        172.16.47.5   k8s-node-2
nginx-deployment2-3766659668-l1pbv   1/1       Running   0          19s       172.16.73.2   k8s-node-1
nginx-deployment2-3766659668-n54wc   1/1       Running   0          19s       172.16.47.2   k8s-node-2
nginx-deployment2-3766659668-pdz98   1/1       Running   0          9m        172.16.73.4   k8s-node-1
nginx-deployment2-3766659668-shlp9   1/1       Running   0          19s       172.16.73.3   k8s-node-1
[root@k8s-master ~]# 
[root@k8s-master ~]# kubectl scale deployment nginx-deployment2 --replicas=3
deployment "nginx-deployment2" scaled
[root@k8s-master ~]# kubectl get deployment nginx-deployment2               
NAME                DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment2   3         3         3            3           17m
[root@k8s-master ~]# kubectl get pods -o wide                               
NAME                                 READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment2-3766659668-57p0w   1/1       Running   0          10m       172.16.73.5   k8s-node-1
nginx-deployment2-3766659668-f9rc6   1/1       Running   0          10m       172.16.47.5   k8s-node-2
nginx-deployment2-3766659668-pdz98   1/1       Running   0          10m       172.16.73.4   k8s-node-1
[root@k8s-master ~]#

 

3.4 升级pod镜像版本

#查看pod镜像版本

[root@k8s-master k8s]# kubectl get rs -o wide
NAME                           DESIRED   CURRENT   READY     AGE       CONTAINER(S)        IMAGE(S)                        SELECTOR
nginx-deployment2-3516246156   5         5         5         5m        nginx-deployment2   192.168.0.136:5000/nginx:1.15   pod-template-hash=3516246156,run=nginx-deployment2
[root@k8s-master k8s]#

 

#升级镜像

 

[root@k8s-master k8s]# kubectl set image deploy nginx-deployment2 nginx-deployment2=192.168.0.136:5000/nginx:latest
deployment "nginx-deployment2" image updated

 

#查看升级结果

[root@k8s-master k8s]# kubectl get rs -o wide
NAME                           DESIRED   CURRENT   READY     AGE       CONTAINER(S)        IMAGE(S)                          SELECTOR
nginx-deployment2-3516246156   3         3         3         7m        nginx-deployment2   192.168.0.136:5000/nginx:1.15     pod-template-hash=3516246156,run=nginx-deployment2
nginx-deployment2-3766659668   3         3         1         2s        nginx-deployment2   192.168.0.136:5000/nginx:latest   pod-template-hash=3766659668,run=nginx-deployment2
[root@k8s-master k8s]# kubectl get rs -o wide
NAME                           DESIRED   CURRENT   READY     AGE       CONTAINER(S)        IMAGE(S)                          SELECTOR
nginx-deployment2-3516246156   0         0         0         7m        nginx-deployment2   192.168.0.136:5000/nginx:1.15     pod-template-hash=3516246156,run=nginx-deployment2
nginx-deployment2-3766659668   5         5         5         10s       nginx-deployment2   192.168.0.136:5000/nginx:latest   pod-template-hash=3766659668,run=nginx-deployment2

 

#升级版本测试

[root@k8s-master k8s]# kubectl get pods -o wide  
NAME                                 READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment2-3766659668-2dl98   1/1       Running   0          18s       172.16.47.4   k8s-node-2
nginx-deployment2-3766659668-57p0w   1/1       Running   0          21s       172.16.73.5   k8s-node-1
nginx-deployment2-3766659668-c1lx6   1/1       Running   0          19s       172.16.47.3   k8s-node-2
nginx-deployment2-3766659668-f9rc6   1/1       Running   0          22s       172.16.47.5   k8s-node-2
nginx-deployment2-3766659668-pdz98   1/1       Running   0          22s       172.16.73.4   k8s-node-1
[root@k8s-master k8s]# curl -I 172.16.73.5
HTTP/1.1 200 OK
Server: nginx/1.17.3
Date: Thu, 22 Aug 2019 08:39:34 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 13 Aug 2019 08:50:00 GMT
Connection: keep-alive
ETag: "5d5279b8-264"
Accept-Ranges: bytes

[root@k8s-master k8s]#

 

#查看升级状态

[root@k8s-master ~]# kubectl rollout status deployment nginx-deployment2 
deployment "nginx-deployment2" successfully rolled out

 

#查看升级历史

[root@k8s-master ~]#   kubectl rollout history deployment nginx-deployment2 
deployments "nginx-deployment2"
REVISION        CHANGE-CAUSE
1               kubectl run nginx-deployment2 --image=192.168.0.136:5000/nginx:1.15 --replicas=5 --record
2               kubectl set image deploy nginx-deployment2 nginx-deployment2=192.168.0.136:5000/nginx:latest

[root@k8s-master ~]#

 

#查看历史版本详情

[root@k8s-master ~]#  kubectl rollout history deployment nginx-deployment2 --revision=2
deployments "nginx-deployment2" with revision #2
  Labels:       pod-template-hash=3766659668
        run=nginx-deployment2
  Annotations:  kubernetes.io/change-cause=kubectl set image deploy nginx-deployment2 nginx-deployment2=192.168.0.136:5000/nginx:latest
  Containers:
   nginx-deployment2:
    Image:      192.168.0.136:5000/nginx:latest
    Port:
    Volume Mounts:      <none>
    Environment Variables:      <none>
  No volumes.

 

 

3.5 回滚pod镜像版本

#查看历史版本

[root@k8s-master ~]# kubectl rollout history deployment nginx-deployment2 
deployments "nginx-deployment2"
REVISION        CHANGE-CAUSE
3               kubectl set image deploy nginx-deployment2 nginx-deployment2=192.168.0.136:5000/nginx:1.15
4               kubectl set image deploy nginx-deployment2 nginx-deployment2=192.168.0.136:5000/nginx:latest

[root@k8s-master ~]# kubectl get rs -o wide                                                                      
NAME                           DESIRED   CURRENT   READY     AGE       CONTAINER(S)        IMAGE(S)                          SELECTOR
nginx-deployment2-3516246156   0         0         0         22m       nginx-deployment2   192.168.0.136:5000/nginx:1.15     pod-template-hash=3516246156,run=nginx-deployment2
nginx-deployment2-3766659668   3         3         3         15m       nginx-deployment2   192.168.0.136:5000/nginx:latest   pod-template-hash=3766659668,run=nginx-deployment2
[root@k8s-master ~]# kubectl get pods -o wide                               
NAME                                 READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment2-3766659668-1ff9k   1/1       Running   0          45s       172.16.73.3   k8s-node-1
nginx-deployment2-3766659668-7v64h   1/1       Running   0          45s       172.16.47.3   k8s-node-2
nginx-deployment2-3766659668-ftvxg   1/1       Running   0          43s       172.16.47.4   k8s-node-2
[root@k8s-master ~]# curl -I 172.16.73.3
HTTP/1.1 200 OK
Server: nginx/1.17.3
Date: Thu, 22 Aug 2019 08:54:46 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 13 Aug 2019 08:50:00 GMT
Connection: keep-alive
ETag: "5d5279b8-264"
Accept-Ranges: bytes

[root@k8s-master ~]#

 

#执行回滚

[root@k8s-master ~]# kubectl rollout undo deployment nginx-deployment2 --to-revision=3
deployment "nginx-deployment2" rolled back
[root@k8s-master ~]#

 

 

#检查回滚结果

[root@k8s-master ~]# kubectl get deployment  nginx-deployment2 
NAME                DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment2   3         3         3            3           25m
[root@k8s-master ~]# kubectl get rs -o wide
NAME                           DESIRED   CURRENT   READY     AGE       CONTAINER(S)        IMAGE(S)                          SELECTOR
nginx-deployment2-3516246156   3         3         3         26m       nginx-deployment2   192.168.0.136:5000/nginx:1.15     pod-template-hash=3516246156,run=nginx-deployment2
nginx-deployment2-3766659668   0         0         0         18m       nginx-deployment2   192.168.0.136:5000/nginx:latest   pod-template-hash=3766659668,run=nginx-deployment2

 

#回滚版本测试

[root@k8s-master ~]# kubectl get pods -o wide     
NAME                                 READY     STATUS    RESTARTS   AGE       IP            NODE
nginx-deployment2-3516246156-0x490   1/1       Running   0          51s       172.16.47.2   k8s-node-2
nginx-deployment2-3516246156-827rs   1/1       Running   0          49s       172.16.73.4   k8s-node-1
nginx-deployment2-3516246156-k09ch   1/1       Running   0          51s       172.16.73.2   k8s-node-1
[root@k8s-master ~]# curl -I 172.16.73.4
HTTP/1.1 200 OK
Server: nginx/1.15.12
Date: Thu, 22 Aug 2019 08:58:08 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 16 Apr 2019 13:08:19 GMT
Connection: keep-alive
ETag: "5cb5d3c3-264"
Accept-Ranges: bytes

[root@k8s-master ~]#

 


 

4 生产建议--record

--record参数记录执行的操作步骤和相关信息生产建议采用这种方式创建deployment

 

kubectl run nginx --image=192.168.0.136:5000/nginx:1.15 --replicas=5 --record

 

posted on 2019-08-26 10:09  光阴8023  阅读(575)  评论(0)  编辑  收藏  举报

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